How to Track Mileage for Taxes: A Complete Guide

Tracking mileage is annoying. You’re driving to a client, your phone is plugged into CarPlay, and the last thing you want is one more thing to remember. So you tell yourself you’ll catch up at the end of the week. Then the end of the month. Then it’s March, your accountant is asking for a mileage log, and you’re squinting at your calendar trying to remember whether the Tuesday entry for “Acme” was a sales call or a happy hour.

You are not unusual. The IRS knows this pattern intimately. So does the Tax Court, which has spent decades disallowing reconstructed mileage logs and explaining, case by case, exactly what counts as proof and what doesn’t.

This guide walks through what the IRS actually requires, what real Tax Court cases say about how to prove your miles, and why automatic tracking has become the strongest audit defense most self-employed taxpayers can build. It’s the second article in our pillar series; if you came here looking for the current rate, our IRS Mileage Rate 2026: Complete Guide for Self-Employed Workers has those numbers and the math behind them.

Key takeaways

• The IRS requires four elements for every business trip: amount (miles), date, destination, and business purpose — under Treas. Reg. §1.274-5T(b)(6).
• Records must be made “at or near the time” of the trip. The regulation explicitly allows a weekly log; anything less frequent gets risky fast.
• The Cohan rule — which lets courts estimate deductions — does not save vehicle deductions. IRC §274(d) overrides it. No log, no deduction.
• W-2 employees still cannot deduct unreimbursed mileage under the One Big Beautiful Bill Act (OBBBA, P.L. 119-21). Self-employed taxpayers are unaffected.
• The 2026 business standard mileage rate is 72.5¢ per mile (Notice 2026-10).
• Keep mileage records for at least 6 years — not 3 — because of how §6501(e) and depreciation recapture work.
• Automatic GPS-and-motion tracking solves the “contemporaneous” requirement in the strongest, most audit-defensible way.

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Why mileage tracking is the highest-ROI habit you can build

At 72.5 cents per mile in 2026, every thousand business miles is worth $725 in deductions. For most self-employed people, that deduction reduces both income tax and self-employment tax — a stack that compounds quickly.

A consultant who drives 12,000 business miles a year is sitting on $8,700 of deductions. At a combined 22% federal bracket, 15.3% self-employment tax, and a 5% state rate, that’s roughly $3,675 of real cash — not on paper, in your bank account. Drive 20,000 miles like a real estate agent or rideshare driver, and you’re at $14,500 of deduction, worth roughly $6,125 in tax savings.

That’s the upside. The downside is symmetrical. If you can’t substantiate those miles in an audit, the IRS disallows the deduction in full, often adds a 20% accuracy penalty under IRC §6662(a), and your bank account shrinks rather than grows. The difference between those two outcomes is how you keep your records.

What the IRS actually requires

The strict-substantiation rule for vehicles lives in IRC §274(d). Cars qualify as “listed property” under §280F(d)(4), which means they fall under §274(d)‘s special documentation standard — a much higher bar than ordinary business expenses.

The four elements of an “adequate record”

Under Treas. Reg. §1.274-5T(b)(6), you must substantiate, for every business use of your vehicle:

1. Amount — the miles driven for that specific business use, plus your total miles for the year.
2. Time — the date.
3. Place — where the trip started and ended.
4. Business purpose — a specific, identifiable business reason.

IRS Publication 463 echoes this in plain English: a mileage log needs each trip’s date, destination, business purpose, and miles, plus odometer readings at the start and end of the year.

What “contemporaneous” really means

This is the line that trips most people up. The exact regulatory standard is in Treas. Reg. §1.274-5T(c)(2)(ii)(A):

“Each recording of an element of an expenditure or use is made at or near the time of the expenditure or use … A log maintained on a weekly basis, which accounts for use during the week, shall be considered a record made at or near the time of such use.”

Translate that into operational rules:

• End of the day: safe.
• End of the week: explicitly safe-harbored by the regulation.
• End of the month: not addressed. The Tax Court treats it as suspect.
• End of the quarter or year: fails. This is reconstruction, and the case law against it is brutal.

The regulation also allows a “sufficient corroborating evidence” pathway when you don’t have a perfect contemporaneous log. But the case law has made that pathway narrow. Treas. Reg. §1.274-5T(c)(1) requires corroborative evidence to rise to “a high degree of probative value” to substitute for a contemporaneous record. In practice, that means receipts, calendar entries, and emails — all created at the time of the trip — that independently verify the four elements.

Adequate vs. inadequate entries

A compliant entry looks like this:

03/14/2026 | Office (1200 Main St, Austin) → Acme Corp HQ (501 Congress Ave) | 14.2 mi | Q1 MSA renewal meeting with J. Smith, Acme procurement

An inadequate entry — the kind the Tax Court has rejected over and over — looks like this:

3/14 — client meeting — 30 mi

No destination. No identifiable client. No specific purpose. No round-trip detail. This is the kind of entry that produces full disallowance.

Mileage log template (IRS-compliant format)

A compliant log only has to do one thing: record the four §274(d) elements for every business trip plus your annual odometer readings, all at or near the time of use. The IRS prescribes no format. The minimum-viable template below maps every column to a requirement in Treas. Reg. §1.274-5T(b)(6), and the example rows mirror what would survive Tax Court scrutiny.

Trip log (per-trip records)

Date	Miles	Start → End	Business purpose	Client/contact
2026-03-14	14.2	Office (1200 Main St, Austin) → Acme HQ (501 Congress Ave)	Q1 MSA renewal meeting	J. Smith (Acme)
2026-03-14	14.0	Acme HQ → Office	Return from Acme meeting	—
2026-03-15	28.0	Office → Brookfield Site (4400 Bee Caves)	Site walkthrough for active project	Brookfield Holdings

Annual odometer record

Year-end record	Example value
Odometer reading, January 1	47,890
Odometer reading, December 31	62,460
Total miles driven for year	14,570
Business miles claimed	9,840
Commuting miles	2,150
Personal miles	2,580

How to use this template

• Capture all four elements every trip. Date, miles, place (start → end), and a specific business purpose. The Tax Court rejects logs that drop business purpose (Larson, Garza, Royster — all walked through in the next section).
• Update weekly at minimum. Treas. Reg. §1.274-5T(c)(2)(ii)(A) treats a weekly log as contemporaneous; daily is stronger. End-of-year reconstruction fails — see the Velez and Parker cases below.
• Record both odometer readings on January 1 and December 31. Examiners use these to reconcile against your claimed business-mile total and against your oil-change and inspection records.
• Save corroboration: calendar invites, emails, invoices, and shop receipts. They independently verify the business purpose and the dates if the trip log itself is challenged.
• For multi-vehicle drivers (the multi-vehicle mileage guide covers the full pattern), run a separate trip log per vehicle. Combining vehicles in one log invites disallowance per Royster v. Commissioner, T.C. Memo. 2010-16.

Reusing this template in a spreadsheet works for low-volume drivers — but the metadata problem covered in the next section means high-volume drivers (rideshare, delivery, real estate) are far better served by automatic tracking. The delivery driver tax guide, the rideshare driver tax guide, and the real estate agent mileage guide walk the persona-specific patterns.

The three tracking methods, compared honestly

You have three real options. All three are technically IRS-compliant if you execute them perfectly. They are not equal.

Paper logbook

A bound paper notebook with the four required elements, filled out at or near the time of each trip, is fully IRS-acceptable. The IRS prescribes no format. A $4 pocket notebook with neat entries is, on paper, indistinguishable from a $100/year app subscription.

The problem is execution. Manual entry takes roughly two minutes per trip. Across a year of driving, that’s hours of overhead at exactly the moments you’re least likely to do it — when you’re rushing into a meeting, climbing out of the car in the rain, or already late for the next appointment. Practitioner-side surveys suggest roughly one in five manual logs fails IRS inspection on completeness.

Paper logs also age in revealing ways. An auditor who flips through a logbook and sees identical ink, identical pen pressure, and no smudges or coffee rings across 365 entries knows what they’re looking at: a logbook filled out in one sitting. So do Tax Court judges. Round-number trips (every entry exactly 10 or 25 miles) signal the same thing.

Spreadsheet (Excel or Google Sheets)

The IRS explicitly accepts digital records. Rev. Proc. 98-25 authorizes machine-sensible records — databases, spreadsheets, accounting software — as long as they’re retained, accessible, and capable of being reproduced. Rev. Proc. 97-22 parallel-authorizes electronic storage systems.

So a Google Sheet, updated weekly with the four elements, is fully compliant. In theory.

In practice, spreadsheets carry metadata. Every .xlsx file embeds a Created date, a Modified date, an Author field, and a revision count. Google Sheets goes further: every cell change is timestamped in Version History that you cannot easily edit. Forensic firms regularly use these properties in litigation to determine whether a document was created contemporaneously with the events it describes.

If an auditor pulls metadata on your 2025 mileage log and the file was created in March 2026 and last modified the same day, you have a problem that’s harder to argue than a paper log. The IRS’s Internal Revenue Manual directs examiners to retain native electronic files in audits — including spreadsheets — which means the metadata travels with the file.

If you’re going to use a spreadsheet, save it weekly, store it in a service with native version history (Google Sheets, OneDrive), and never bulk-edit it at year-end.

Automatic mobile app

An app that uses your phone’s sensors and GPS to detect trips and log them at the moment they happen sidesteps the contemporaneous problem entirely. Every trip is timestamped, GPS-verified, and recorded the same day — exceeding the regulation’s weekly-log safe harbor by orders of magnitude.

The first generation of these apps had a real problem: continuous GPS polling drained batteries. MileIQ, early Stride, and the first QuickBooks Self-Employed mileage module accumulated years of user complaints about phones overheating and dying mid-day. That reputation lingers, even though the apps that survived have largely rebuilt themselves on a different architecture.

The second-generation approach uses sensor fusion: your phone’s motion coprocessor (introduced as the M7 in the iPhone 5S) classifies activity as stationary, walking, or automotive at near-zero power cost. The app sleeps until iOS wakes it via a cell-tower-based “significant location change” event, briefly confirms via the motion classifier that you’re actually in a vehicle, and only then turns on GPS — for the minutes a trip is in progress. Apple’s own Energy Efficiency Guide for iOS Apps prescribes exactly this pattern.

That’s why a well-designed mileage app today can sit on your phone all day at roughly 1% battery per hour of driving and effectively zero drain when you’re stationary — a different category of product than the first-generation apps that gave the category a bad name.

Side-by-side

Lessons from the courtroom

The Tax Court has been remarkably consistent on what works and what doesn’t. A handful of cases tell most of the story.

Cohan v. Commissioner, 39 F.2d 540 (2d Cir. 1930), is the foundational estimation case — Judge Learned Hand allowed Broadway producer George M. Cohan to deduct travel expenses by approximation. People bring it up constantly when defending sloppy records.

It doesn’t apply to your car. Congress overrode Cohan for travel, entertainment, and listed property when it enacted §274(d), and Sanford v. Commissioner, 50 T.C. 823 (1968), made that explicit. The regulation says so on its face: §1.274-5T(a) states that the section “supersedes the doctrine found in Cohan v. Commissioner.” If your mileage log fails the §274(d) test, the deduction is gone. The court is not allowed to estimate in your favor.

Velez v. Commissioner, T.C. Memo. 2018-46, is the modern cautionary tale. Mr. Velez, an Ohio attorney with five offices, claimed an $18,946 vehicle deduction on 34,136 miles. He kept no contemporaneous log. Two days before trial, he reconstructed mileage logs from his iPad calendar, American Express statements, and United Mileage Plus records. The Tax Court rejected the reconstruction entirely and imposed a 20% accuracy-related penalty. Calendar entries did not corroborate either the business purpose or the location of trips.

Royster v. Commissioner, T.C. Memo. 2010-16, addressed the odometer-only log. The taxpayer recorded daily beginning and ending odometer readings — and nothing else. No destinations, no business purpose, no indication which of several vehicles was driven. Deduction disallowed; penalty sustained.

Larson v. Commissioner, T.C. Memo. 2008-187, killed the “city name” log. The taxpayer kept a calendar listing destinations by city name and miles driven, but no client identifier and no specific business purpose. The court accepted he probably drove for business and disallowed the deduction anyway, citing §274(d).

Parker v. Commissioner, T.C. Memo. 2021-111, rejected a reconstruction built from a calendar, driving habits, and Google Maps distances — the exact pattern many taxpayers fall into. Struble v. Commissioner, T.C. Summ. Op. 2022-1, made the same point for an Air Force employee’s reconstructed log between Texas bases.

The one bright case for automatic tracking is Patitz v. Commissioner, T.C. Memo. 2022-99, where the Tax Court accepted electronic mileage logs as contemporaneous records. The court did not single out a specific app, but its reasoning — that records timestamped at the moment of use have the probative weight the regulation requires — is the precise theory automatic apps are built on.

The pattern is unmistakable. Reconstructed records lose. Vague records lose. Contemporaneous, specific records win.

How to track mileage step by step

If you’re starting from scratch today, here’s the process that produces a defensible log under §274(d).

1. Read your odometer on January 1 (or the day you start the business, or the day you put the vehicle in service) and write the number down. Pub. 463 expects this as the anchor for your annual totals.
2. Decide your method. Paper, spreadsheet, or automatic app. If you choose paper or spreadsheet, commit to a weekly update cadence — the regulation’s safe harbor.
3. Capture all four elements for every business trip: date, miles, where you went, and a specific business purpose tied to a client, prospect, vendor, or business task. Keep the corroborating artifact when you can — the calendar invite, the email, the invoice.
4. Distinguish business miles from commuting and personal miles. Commuting from home to a regular work location is never deductible (Rev. Rul. 99-7; Fausner v. Commissioner, 413 U.S. 838 (1973)). Travel between work sites and travel from a qualifying home office to any client site is deductible.
5. Save documentary corroboration: oil-change receipts and state inspection slips, which independently record your odometer at points throughout the year. These are the single most powerful auxiliary records you can have because auditors use them to cross-check your claimed annual total.
6. Read your odometer on December 31 and write that number down too.
7. At tax time, complete Schedule C Part IV honestly: business miles, commuting miles, and personal miles on Lines 44a, 44b, and 44c; answer Lines 45 and 46 truthfully; answer “Yes” on Line 47a and 47b (you do have written evidence).

How long to keep your records

The standard internet answer is “three years.” For mileage, that’s wrong.

IRC §6501(a) gives the IRS three years to assess additional tax after you file. That’s the floor.

IRC §6501(e)(1)(A) extends the period to six years if you omit gross income exceeding 25% of the gross income shown on the return. For Schedule C taxpayers — who report gross receipts, not net — that threshold is easier to cross than wage earners realize, especially in a year with one large client or a contested invoice.

IRC §6501(c) removes the limit entirely for fraudulent or unfiled returns.

There’s also a depreciation reason to keep mileage records longer. The standard mileage rate includes a built-in depreciation component — 35¢ per mile in 2026, 33¢ in 2025, 30¢ in 2024, 28¢ in 2023, 26¢ in 2022 (Rev. Proc. 2019-46; Notice 2026-10). When you eventually sell or trade in the vehicle, your basis must be reduced by the accumulated deemed depreciation across every business mile you ever claimed. If you sell a vehicle in year 7, you need year-1 records to compute the gain or loss correctly.

The practical rule: keep vehicle mileage logs for at least 6 years from the filing date, and keep records for any vehicle you might still own — or sold within the past 3 years — regardless of age. Storage is cheap; reconstructing isn’t.

What an IRS mileage audit actually looks like

Most mileage exams are correspondence audits. You’ll get a letter (often a CP2000 or a 566) asking for documentation. You’ll have 30 days to respond. Office audits — in-person at a Taxpayer Assistance Center — are next most common. Field audits, where a Revenue Agent visits your office or your representative’s, are rarer but more thorough.

The Information Document Request for vehicle expenses typically asks for:

• Your mileage log or trip sheets for the tax year
• Your calendar or appointment book for corroboration
• Repair, oil-change, and state-inspection records showing odometer readings at multiple points
• Vehicle title or lease, registration, and date placed in service
• Gas, parking, and toll receipts (if claiming actual expenses)
• Client invoices, contracts, or other evidence tying specific trips to specific business purposes

Examiners are explicitly trained to reconcile your claimed annual mileage to third-party odometer readings from shop receipts and inspection records. If you claim 22,000 business miles and your oil-change records show your odometer moved 14,000 miles all year, the audit is over before you arrive.

A correspondence audit on a single Schedule C issue typically resolves in 3–6 months. Office audits run 6–12 months. Field audits often stretch 12–24 months or longer. Throughout, the IRS can — and routinely does — expand the exam to prior years if patterns suggest broader issues.

If you can’t substantiate, the deduction is disallowed in full. A 20% accuracy penalty under §6662(a) is standard. A 75% civil fraud penalty under §6663 is possible if fabricated records are detected.

For a full audit walkthrough — what to send, when to respond, when to bring in a representative, and how to negotiate down a proposed disallowance — see our Mileage Audit Defense Playbook.

OBBBA 2026: what changed and what didn’t

The One Big Beautiful Bill Act (P.L. 119-21), signed July 4, 2025, made permanent the TCJA-era suspension of miscellaneous itemized deductions subject to the 2% AGI floor (§70110 of the Act, amending §67(g)).

The practical effects for mileage:

• W-2 employees still cannot deduct unreimbursed vehicle/mileage expenses. What was a temporary suspension scheduled to sunset after 2025 is now permanent. Narrow exceptions remain for Armed Forces reservists, qualified performing artists, fee-basis state/local officials, and certain impairment-related work expenses.
• Self-employed people — Schedule C filers, Schedule F farmers, Schedule E real-estate professionals, and partners with unreimbursed partnership expenses — are unaffected. Vehicle expenses remain deductible against business income.
• No new mileage substantiation rules were added. Section 274(d) and Treas. Reg. §1.274-5T continue to control.

This article is built for self-employed taxpayers because OBBBA narrowed the audience for vehicle deductions to exactly that group. If you’re a W-2 employee with unreimbursed mileage, your best path is to ask your employer to set up an accountable plan under Treas. Reg. §1.62-2 — a reimbursement arrangement that’s tax-free to you and deductible to the employer.

Two worked examples

The math behind mileage deductions is more powerful than most people realize because the deduction reduces both income tax and self-employment tax. Here it is laid out fully.

Example 1: Freelance consultant — 12,000 business miles

Example 2: Real estate agent — 22,000 business miles

The cost of a year of automatic tracking is somewhere between $0 and $100. The cost of losing those deductions in an audit is the full deduction plus a 20% accuracy penalty plus interest. The expected-value math is not subtle.

Common compliance gotchas

A few things trip up self-employed taxpayers reliably:

“Business purpose” specificity. “Client meeting” is not enough. Treas. Reg. §1.274-5T(c)(2)(ii)(B) lets you satisfy business purpose with less when it’s “evident from the surrounding facts and circumstances,” but the safe move is always to name the client, the activity, and (where it exists) the underlying engagement.

Commute vs. business miles. Home to your regular work location is never deductible. Fausner v. Commissioner makes clear that carrying tools or taking a business call doesn’t convert a commute. But Rev. Rul. 99-7 carves out three deductible patterns: travel between work sites in the same day, travel from home to a temporary work location outside your metro area, and — for taxpayers with a qualifying §280A(c)(1)(A) home office — travel from the home office to any other work location.

Schedule C Line 46. “Do you (or your spouse) have another vehicle available for personal use?” If you answer “No” and claim 100% business use on a single vehicle, expect a closer look. Examiners read this combination as implausible.

Schedule C Line 47b. “Is the evidence written?” Answering “No” is, functionally, a self-disclosed failure of Treas. Reg. §1.274-5T(c). Don’t answer it that way casually.

Method lock-in. If you elect actual expenses with MACRS depreciation in year 1, you’re locked out of the standard mileage rate for that vehicle forever (Rev. Proc. 2019-46 §5.03). For leased vehicles, electing standard mileage in year 1 locks it in for the entire lease term, including renewals.

Five-or-more-vehicle disqualification. If you operate five or more vehicles simultaneously, you cannot use the standard mileage rate (Pub. 463 fleet-operations rule). Actual expenses are your only path.

How automatic tracking solves the contemporaneous problem

Strip the technology back to its purpose. The §274(d) “adequate records” standard demands that each trip’s date, miles, destination, and purpose be recorded at or near the time of use. The regulation’s safe harbor is weekly. The case law’s reward for stronger contemporaneity is favorable treatment when an auditor scrutinizes the record.

An app that detects driving the moment it starts, logs the trip with GPS-verified mileage, timestamps the entry, and asks you to confirm or classify the purpose later that same day is — by design — operating well above the regulatory floor. The metadata on each entry is generated by the device, not by the user, which gives it the kind of probative weight reconstructed records can never have.

Where second-generation automatic apps differentiate from each other is how they do this. The architecture matters for two reasons most articles don’t discuss: battery life and privacy.

Battery life. Apps that solve detection by running GPS continuously drain phones. Apps that use Apple’s Core Motion activity classifier and CoreLocation’s significant-location-change service to wake only when motion is confirmed run at roughly 1% battery per hour of driving and almost nothing while you’re sitting still. Apple’s own developer documentation prescribes exactly this pattern in its Energy Efficiency Guide for iOS Apps.

Privacy. Apps that upload raw GPS traces to a server create a permanent, queryable dataset of every place you’ve driven for the duration of their retention policy — sometimes seven years or more. That dataset is reachable in civil discovery, tax disputes, divorce proceedings, and other contexts under the third-party doctrine (mitigated but not eliminated by Carpenter v. United States, 138 S. Ct. 2206 (2018)). California’s CPRA classifies precise geolocation as sensitive personal information (Cal. Civ. Code §1798.140(ae)). Virginia, Colorado, Connecticut, and Oregon have all expanded similar protections through 2024–2025 legislation.

Apps that process trips on the device — that work out the distance, the start and end points, and the timestamps on your phone and only ever store the summary — sidestep that exposure entirely. There’s no cloud dataset to subpoena. There’s no outside processor to disclose to.

This is how EveryLastMile is built. Your iPhone notices when you start moving, the app wakes up just long enough to confirm you’re in a vehicle, and GPS turns on only while the trip is in progress — then shuts back off. Each trip is logged on your phone the moment it ends. The full route never leaves your device, and there’s no server-side copy of where you’ve been.

The result is an automatic log that meets the §274(d) “at or near the time” standard the way the Tax Court approved in Patitz, runs on Apple’s published energy-efficiency pattern rather than against it, and doesn’t put your location history into a cloud database you can’t control.

Frequently asked questions

How do I track mileage for taxes?

Capture the four elements the IRS requires — date, miles, destination, and a specific business purpose — for every business trip, at or near the time of the trip. Paper, spreadsheet, and automatic app are all acceptable; automatic apps satisfy the contemporaneous standard most reliably.

What does the IRS require for a mileage log?

Treas. Reg. §1.274-5T(b)(6) requires the amount (miles), time (date), place (destination), and business purpose for each trip, plus odometer readings at the start and end of the year. Records must be made at or near the time of use — weekly is the regulatory safe harbor.

How many miles can you write off without getting audited?

There's no specific threshold. Audit risk rises when (a) the deduction is large relative to your business income, (b) Schedule C Line 46 is answered No, (c) business use is 100% on a single vehicle, or (d) claimed miles are inconsistent with third-party odometer readings from shop and inspection records.

What happens if you don't have a mileage log?

The deduction is disallowed in full. The Cohan rule (which allows courts to estimate other expenses) does not apply to vehicle deductions under §274(d). See Sanford v. Commissioner, 50 T.C. 823 (1968). An accuracy penalty under §6662(a) typically follows.

Is it better to deduct mileage or actual gas expenses?

Two different methods. The standard mileage rate (72.5¢/mi in 2026) bundles depreciation, gas, insurance, maintenance, and registration into one number. Actual expenses lets you deduct the business-use percentage of every real cost. For most self-employed drivers, standard wins on simplicity; for vehicles with high actual costs (heavy SUVs, EVs in some scenarios), actual can win.

Can I switch between standard mileage and actual expenses?

Generally yes — but only if you used standard mileage in year 1. If you elected actual expenses with MACRS depreciation in year 1, you're locked into actual for that vehicle (Rev. Proc. 2019-46 §5.03). Leased vehicles: standard-mileage election in year 1 locks in for the lease term.

Do I need odometer readings for tax deductions?

Yes. Pub. 463 expects readings at the beginning and end of the year (and on the dates a vehicle is placed in or removed from service). Auditors use them to reconcile your total annual miles to claimed business miles on Schedule C Line 44.

Can I claim mileage to and from work?

Generally no — commuting from home to a regular work location is personal under Fausner v. Commissioner, 413 U.S. 838 (1973). Exceptions in Rev. Rul. 99-7 include travel between work locations, travel to a temporary work location outside your metro area, and (if you have a qualifying §280A home office) travel from the home office to other work sites.

What is a contemporaneous mileage log?

A log where each entry is made at or near the time of the trip (Treas. Reg. §1.274-5T(c)(2)(ii)(A)). The regulation treats a weekly log as contemporaneous. Daily is stronger; monthly is risky; year-end reconstruction fails.

Can I use a paper log instead of an app?

Yes. The IRS prescribes no format. A paper logbook with the four required elements, filled out at or near the time of each trip, is fully compliant. The behavioral and audit-defensibility tradeoffs are real, but the legal status is identical to an app.

How long should I keep my mileage records?

At least 6 years. The general statute of limitations under §6501(a) is 3 years, but §6501(e)(1)(A) extends it to 6 years when 25% or more of gross income is omitted — a threshold easier to cross on Schedule C. Keep records for any vehicle you still own, or sold within the past 3 years, regardless of age.

Does the IRS accept digital mileage logs?

Yes. Rev. Proc. 98-25 explicitly authorizes machine-sensible electronic records, including spreadsheets and apps. Rev. Proc. 97-22 authorizes electronic storage systems.

What if I forgot to track my mileage?

You can attempt reconstruction using calendars, emails, invoices, and Google Maps distances, but the corroborative evidence must rise to a high degree of probative value (Treas. Reg. §1.274-5T(c)(1)). The Tax Court has rejected reconstructed logs in Velez, Parker, Struble, and many others. Start an automatic log today for the rest of the year and consult a tax professional about the prior period.

Can W-2 employees still deduct mileage in 2026?

Generally no. The One Big Beautiful Bill Act (P.L. 119-21, §70110) made the §67(g) suspension of unreimbursed employee business expenses permanent. Narrow exceptions remain for Armed Forces reservists, qualified performing artists, fee-basis officials, and impairment-related expenses. Your best path is an employer-sponsored accountable plan.

How do mileage tracking apps protect me in an audit?

Apps that timestamp each trip at the moment of use produce records that meet the §274(d) at-or-near-the-time standard the way the Tax Court approved in Patitz v. Commissioner, T.C. Memo. 2022-99. The GPS metadata is generated by the device rather than by you, which gives it probative weight reconstructed records cannot have.

Where to go next

If you came here from our IRS Mileage Rate 2026 guide, the natural next step is putting the rules into practice for your situation. Persona-specific deep dives cover the patterns that vary most:

• Rideshare driver mileage tax guide — Uber and Lyft 1099s, online-miles vs. on-trip miles, and Prop 22 mechanics.
• Delivery driver mileage tax guide — DoorDash, Uber Eats, Instacart, Spark, Grubhub, and Amazon Flex on one Schedule C.
• Mileage tracking for real estate agents — how the home-office exception under §280A converts showings, listings, and closings into deductible miles.
• Freelancer 1099 mileage and Schedule C — how mileage interacts with the rest of a freelancer’s Schedule C, quarter by quarter.
• Mileage audit defense playbook — what to do if a 566 or CP2000 arrives in the mail.

For everything else, the FAQ above and our support page are the fastest paths. If you want to stop thinking about any of this — install EveryLastMile, drive, and let the app do the substantiation for you.

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This article is for general educational purposes for U.S. self-employed taxpayers. Tax law changes; your situation has facts this article cannot account for. Before relying on any specific position discussed here, consult a CPA, enrolled agent, or tax attorney. EveryLastMile is a tool, not a substitute for professional advice.