Instacart Driver Tax Guide 2026

The definitive 2026 tax guide for Instacart Full-Service Shoppers — Maplebear 1099-NEC, mileage, QBI, OBBBA tip deduction, and Schedule C done right.

EveryLastMile

If you spent 2025 or 2026 pushing a cart through Safeway, Costco, or your local Sprouts for Instacart customers, your “employer” wasn’t actually Instacart. It was Maplebear, Inc. — the legal entity that does business as Instacart and that signs the bottom of your 1099-NEC. That single fact trips up thousands of shoppers every January, and it is just the first of a half-dozen Instacart-specific quirks the open web mostly gets wrong.

This is the full tax pillar. Mileage is one section among many. If you want the deep dive on whether the Instacart app tracks your miles (it doesn’t, not in a way the IRS will accept), read our companion piece, Does Instacart Track Miles? (2026). If you also drive for Walmart Spark, read our sibling article, Walmart Spark Driver Tax Guide 2026. Everything else — the Maplebear 1099, the Stripe Express history, the in-store shopping time problem, the OBBBA changes, the new “No Tax on Tips” deduction that does cover grocery delivery — is below.

Key takeaways

  • You are a sole proprietor. Instacart Full-Service Shoppers are 1099 independent contractors of Maplebear, Inc. You file Schedule C, Schedule SE, and (if you owe $1,000+) Form 1040-ES quarterly.
  • The 2026 mileage rate is 72.5¢ per business mile under IRS Notice 2026-10 — up 2.5¢ from 2025. Tolls and parking are separately deductible on top.
  • The 1099-NEC threshold changed. For 2025 earnings (the form you got in early 2026), Maplebear had to issue a 1099-NEC at $600. For 2026 earnings (form arriving early 2027), OBBBA §70433 raises that floor to $2,000. You still owe tax on every dollar.
  • The §199A QBI deduction is now permanent and includes a new $400 minimum for active small businesses with at least $1,000 of QBI (OBBBA §70105; IRC §199A(i)).
  • OBBBA’s “No Tax on Tips” deduction (new IRC §224) covers Instacart shoppers. Treasury’s final regulations list “Goods Delivery People” (TTOC 804) as an eligible occupation and call out “grocery delivery driver” as an illustrative example.
  • Mileage records are not optional. Under IRC §274(d), no log = no deduction, and the Tax Court has hammered this point repeatedly — see Velez, Khan, Garza, and Patitz.

Your tax status as an Instacart Shopper

Instacart runs two worker programs that are taxed in opposite ways.

Full-Service Shoppers — the audience for this article — shop and deliver using their own car. They are independent contractors of Maplebear, Inc., they get a 1099-NEC, no taxes are withheld, and they owe self-employment tax under IRC §1401. Their “net earnings from self-employment” are defined in IRC §1402(a) as gross income from any trade or business, less allowable deductions.

In-Store Shoppers are part-time W-2 employees of Maplebear who only shop inside a store; they don’t deliver. Taxes are withheld, they get a W-2, and they cannot deduct unreimbursed business expenses on a federal return — OBBBA §70110 made the §67 misc itemized deduction disallowance permanent. If that’s you, this article is the wrong one — see our Employee Mileage Reimbursement by State (2026) instead.

A note for switchers: if you worked In-Store for part of 2025 and then converted to Full-Service, you will receive both a W-2 and a 1099-NEC for that same year. Both go on the same Form 1040, but only the 1099 income flows through Schedule C and Schedule SE.

California shoppers: Proposition 22 — and the California Supreme Court’s decision in Castellanos v. State of California, 16 Cal. 5th 588 (2024) — confirmed that app-based drivers and shoppers, including Instacart Full-Service Shoppers, remain independent contractors despite AB 5. For state-specific mechanics, see California Mileage Reimbursement (2026).

What forms Maplebear issues you

You will (probably) get exactly one tax form: a Form 1099-NEC from Maplebear, Inc. Confused shoppers regularly call support thinking they got the wrong form because the issuer says “Maplebear” instead of “Instacart.” It is the same company. Maplebear is the legal name; Instacart is the d/b/a.

Box 1 of that 1099-NEC reports your total Instacart earnings — base batch pay, peak boosts, heavy pay, promotions, referral bonuses, and in-app tips. Cash tips a customer hands you in person are not on the 1099-NEC; you must still report them as income under IRC §61(a).

How you get it. From 2021 through 2022, Maplebear delivered 1099s through Stripe Express. Starting with the 2023 tax year, Maplebear took 1099 delivery in-house — forms arrive by email or postal mail directly from Instacart, not through Stripe. Stride Health’s shopper-help page is explicit that 2024 forms were not delivered through Stripe Express as they had been in prior years; 1099s were sent directly to all Shoppers as of 1/31/25. If you cannot find your 1099 by mid-February, reach out to 1099@instacart.com or the shopper hotline.

The OBBBA threshold transition. Section 70433 of the One, Big, Beautiful Bill Act (Pub. L. 119-21) amends IRC §§6041(a) and 6041A(a)(2) to raise the 1099-NEC reporting threshold from $600 to $2,000 for payments made after December 31, 2025.

Tax year Threshold for Maplebear to issue you a 1099-NEC
2025 (form arrives Jan. 2026) $600
2026 (form arrives Jan. 2027) $2,000

The threshold determines when Instacart has to send you paper. It does not change your obligation to report every dollar of income on Schedule C.

Will you also get a 1099-K? Probably not from Instacart. Maplebear pays you directly (via ACH or Instant Cashout), so it issues a 1099-NEC, not a 1099-K. Even if a 1099-K did appear, OBBBA §70432 restored the 1099-K threshold to $20,000 and 200 transactions, so most shoppers won’t see one.

The new 2026 Form 1099-NEC has more boxes. The IRS released a draft Form 1099-NEC (Rev. December 2026) with a new Box 1b for “cash tips” and a new Box 1c for the Treasury Tipped Occupation Code (TTOC). That matters because of §224 — discussed below.

Schedule C, line by line for Instacart

You report your Instacart business on Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship). Here is the mapping for a typical shopper:

  • Part I, Line 1 — Gross receipts. Total dollars Maplebear paid you, including tips, plus any cash tips not on the 1099. If your 1099-NEC shows $42,000, but you also pocketed $7,800 in in-app tips already included on that 1099, you report the 1099 total. Don’t double-count.
  • Part II, Line 9 — Car and truck expenses. Mileage at 72.5¢ × business miles (standard method) — covered in the next section.
  • Line 18 — Office expense. If you bought a small home office printer or paper for shopping lists, this is where it goes.
  • Line 22 — Supplies. This is the Instacart sleeper line. Insulated bags, coolers, ice packs, hand-truck dollies, sanitizing wipes, reusable shopping bags — all ordinary and necessary under IRC §162 and deductible here. The de minimis safe harbor at Treas. Reg. §1.263(a)-1(f)(1)(ii)(D) lets you expense items costing $2,500 or less per invoice without bothering to capitalize them.
  • Line 25 — Utilities. The business-use percentage of your phone bill.
  • Line 27a — Other expenses. Mileage tracker subscription (EveryLastMile, Stride premium features, Hurdlr — whatever you use), tolls, parking, scanner styluses, the cost of a phone mount, and Instacart-themed apparel if you have any.
  • Part IV — Vehicle Information. Required if you take the standard mileage rate. You must report total miles, business miles, commute miles, and whether you have written records.

The unique Instacart wrinkle is that a meaningful share of your work happens inside the store and generates zero deductible mileage. Per Gridwise’s analysis of 500,000+ gig drivers (gridwise.io, 2025), the shopping component adds 20–30 minutes per batch compared to a food delivery, and the average Instacart shopper completes roughly one batch per 62 minutes — putting in-store time at about 32–48% of active work time per batch. That makes the supplies and phone lines disproportionately important for shoppers compared to pure delivery drivers.

Instacart-specific deductions beyond mileage

The big-ticket deduction is mileage. But Instacart shoppers leave more on the table on the other lines than almost any other gig category because the in-store time isn’t generating mileage. Items to check:

  • Phone and data. Deductible at your business-use percentage under IRC §162 and Treas. Reg. §1.262-1. If you use the phone 60% for batching, GPS, and customer chats, deduct 60% of the monthly bill.
  • Insulated bags, coolers, ice packs. Fully deductible the year purchased under the de minimis safe harbor.
  • Phone mounts, car chargers, dash cams. Same — Schedule C Line 22 or 27a.
  • Instacart-themed apparel. If you actually wear Instacart-branded gear (a hat or shirt issued or sold by the program), it qualifies under Rev. Rul. 70-474. Regular street clothes don’t, even if you only wear them for shopping.
  • Tolls and parking — separately deductible on top of the mileage rate. Rev. Proc. 2019-46 §4.03, which Notice 2026-10 incorporates by reference, is explicit that parking fees and tolls attributable to business use of an automobile are deductible as separate items.
  • Mileage tracker subscriptions. EveryLastMile at $3.99/month or $39.99/year is an ordinary and necessary business expense — deduct it.
  • The Instacart shopper debit card. No fees that we have been able to find, but Instant Cashout costs $0.50 each and that fee is deductible.
  • In-store shopping time. Not deductible — you’re not driving, and Full-Service Shoppers don’t earn an hourly wage you can characterize as anything else. The reason this is even worth saying is that some Reddit threads confuse it with the W-2 In-Store program. Different program, different tax treatment.

Mileage: the single largest deduction

For 2026, the IRS business standard mileage rate is 72.5 cents per mile under Notice 2026-10 (effective January 1, 2026; up 2.5¢ from 2025’s 70¢ rate). For 2025 returns filed in spring 2026, the rate is 70¢. The 2026 rate folds in fuel, depreciation (35¢ of the 72.5¢ is the depreciation component per Notice 2026-10), insurance, maintenance, and registration into one per-mile number.

What it does not include: tolls, parking, and the interest on a car loan (for self-employed, that’s a separate deduction).

The Instacart mileage gap. The offer card you see when accepting a batch shows the store-to-customer distance, period. It does not include:

  1. The drive from your home (or last drop-off) to the store.
  2. The miles you drive between two stores on a double-batch.
  3. The drive home (or to the next batch start point) — these may or may not be deductible depending on whether you use the home-office safe harbor or have a “regular place of business” analysis, but they’re frequently business miles under Rev. Rul. 99-7.

If you rely on the offer-card numbers, you will under-report business miles by a meaningful margin. Sara, one of our test users, logged 16,200 miles for 2024 using EveryLastMile’s automatic tracker; her Instacart “in-app mileage estimate” showed roughly 9,400 miles for the same period. At 72.5¢/mile, that gap is worth $4,930 in deductions.

Contemporaneous substantiation is mandatory. IRC §274(d) requires “adequate records or sufficient evidence corroborating the taxpayer’s own statement” of (a) the amount, (b) the time and place, and (c) the business purpose of every vehicle expense. The temporary regulation, Treas. Reg. §1.274-5T(c), sets the bar even higher: the records must be made “at or near the time” of the trip.

The Tax Court has been brutal on rideshare and delivery drivers who try to reconstruct logs after the fact:

  • Velez v. Commissioner, T.C. Memo. 2018-46 — vehicle expense deduction disallowed where the mileage summary was prepared in anticipation of trial and not contemporaneously.
  • Khan v. Commissioner, T.C. Summ. Op. 2025-5 — the most recent gig-worker case, where the court repeated that petitioners did not maintain adequate books or records that support the claimed expenses under section 274(d). Note this is a small-case decision, non-precedential under IRC §7463(b), but the reasoning is consistent with the broader case law.
  • Garza v. Commissioner, T.C. Memo. 2014-121 — reconstructed logs from calendar entries failed §274(d) substantiation.
  • Patitz, Boyd, and Cosio v. Commissioner, T.C. Memo. 2022-99 — confirmed that Cohan-rule estimation is unavailable for items governed by §274(d).

The takeaway is simple: keep a contemporaneous, GPS-backed log of every batch. For more, see our Mileage Audit Defense Playbook and the Delivery Driver Mileage Tax Guide 2026.

Self-employment tax

Schedule C net profit doesn’t just flow into income tax — it also feeds Schedule SE for self-employment (SECA) tax under IRC §1401:

  • 12.4% Social Security tax on net earnings from self-employment up to the 2026 Social Security wage base of $184,500 (per SSA’s official 2026 COLA Fact Sheet, announced October 24, 2025).
  • 2.9% Medicare tax on the entire amount with no cap.
  • +0.9% Additional Medicare Tax under IRC §1401(b)(2) on self-employment income above $200,000 (single) or $250,000 (MFJ).

Two friendly mechanics:

  1. The 92.35% reduction (IRC §1402(a)(12)). You only pay SE tax on 92.35% of net Schedule C profit. This is the “employer-side” FICA workaround.
  2. The deduction for half of SE tax (IRC §164(f)). You take an above-the-line deduction on Schedule 1 for 50% of your SE tax. It reduces AGI but not SE tax itself.

For a Full-Service Shopper with $33,000 of net profit, SE tax runs around $4,668 — the largest single tax line on your return, frequently larger than your income tax.

The §199A Qualified Business Income deduction

For tax years 2026 and beyond, IRC §199A lets a sole proprietor deduct up to 20% of qualified business income from a non-SSTB trade or business. Delivery is not on the SSTB list under IRC §199A(d)(2), so Instacart shoppers qualify in full at any income level (the SSTB limits and W-2 wage tests don’t bite you).

OBBBA permanence and the $400 minimum. OBBBA §70105 made §199A permanent (it was scheduled to sunset 12/31/2025) and added new IRC §199A(i): if you have at least $1,000 of active QBI and materially participate, you get a minimum $400 deduction — even if the regular 20% calculation would give you less. Both thresholds are indexed for inflation after 2026.

2026 income thresholds (Rev. Proc. 2025-32, §4.26): full QBI deduction up to $201,775 (single) or $403,550 (MFJ) of taxable income, with phase-in over the next $75,000 / $150,000. Delivery shoppers virtually never hit these caps.

The mechanical formula: deduct the lesser of (a) 20% × QBI, or (b) 20% × (taxable income − net capital gain). The minimum kicks in if both come out below $400.

State taxes

State treatment varies more than federal. A few things every Instacart shopper should know:

  • Nine states with no individual income tax (AK, FL, NV, NH, SD, TN, TX, WA, WY) — your only state-level tax is the SE-tax-like share of SECA, which goes to the federal government regardless.
  • Arizona. Per the Tax Foundation’s 2026 State Tax Competitiveness Index, Arizona’s individual income tax is a flat 2.5%, the lowest in the country. Our worked example below uses Arizona.
  • California, New Jersey, and New York do not conform to §199A. You can take the federal QBI deduction, but the state will add it back. CA Schedule CA(540) makes this explicit. If you live in those states, your 20% QBI savings is federal-only.
  • California Prop 22 — confirmed constitutional in Castellanos (2024). Full-Service Shoppers remain independent contractors. See California Mileage Reimbursement (2026).
  • Cross-state batches. If you live in NJ, accept a batch that takes you into PA, then deliver in NJ — that’s still NJ-sourced business income for you. Income is generally sourced to the state of your tax home, not the state where each delivery is dropped, for a self-employed driver without a fixed business location in another state.

Worked example: a full year for Camila in suburban Arizona

Camila shops full-time for Instacart out of a suburb of Phoenix. She is single and has no other job. Her 2026 numbers:

Item Amount
Base batch pay + boosts + heavy pay (Maplebear 1099-NEC) $42,000
Tips (in-app, paid through Maplebear) $7,800
Gross receipts (Schedule C, Line 1) $49,800
Mileage (22,000 business miles × 72.5¢) ($15,950)
Phone (50% × $60/mo × 12) ($360)
Insulated bag, cooler, scanner stylus ($230)
EveryLastMile annual subscription ($40)
Tolls + parking ($180)
Schedule C net profit $33,040

Schedule SE:

  • $33,040 × 92.35% = $30,512
  • × 15.3% = $4,668 SE tax
  • Half-of-SE-tax above-the-line deduction (IRC §164(f)): $2,334

Federal income tax:

  • AGI: $33,040 − $2,334 = $30,706
  • Standard deduction (2026 single, Rev. Proc. 2025-32): $16,100
  • Pre-QBI taxable income: $14,606
  • QBI deduction: lesser of 20% × $33,040 = $6,608, or 20% × $14,606 = $2,921 → $2,921
  • Taxable income: $11,685
  • Federal income tax (10% bracket to $12,400 single per Rev. Proc. 2025-32): ≈ $1,169

Arizona state tax: $33,040 × 2.5% ≈ $826 (Arizona uses federal AGI as a starting point; the QBI deduction generally flows because Arizona conforms).

Camila’s total tax bill: about $6,663 federal + state.

Now the horror version. Suppose Camila didn’t track her miles and can’t substantiate them under §274(d) (the Velez / Khan problem). The IRS disallows the entire $15,950 mileage deduction. Her Schedule C profit balloons to $48,990. SE tax jumps to $6,925. Her income tax climbs into the 12% bracket. Her total federal tax burden rises by roughly $5,800.

That is the dollar cost of not keeping a contemporaneous log. EveryLastMile costs $39.99 a year.

Quarterly estimated taxes

If you expect to owe $1,000 or more in federal tax for 2026, IRC §6654 requires you to make quarterly estimated payments using Form 1040-ES, or you’ll owe an underpayment penalty.

2026 quarterly deadlines:

  • Q1 2026: April 15, 2026
  • Q2 2026: June 15, 2026
  • Q3 2026: September 15, 2026
  • Q4 2026: January 15, 2027

Safe harbors (IRC §6654(d)(1)(B)): you avoid the penalty if your withholding plus estimates equal at least the lesser of (a) 90% of current-year tax or (b) 100% of prior-year tax (110% if prior-year AGI was over $150,000). Because Instacart withholds nothing, “withholding” for most shoppers is zero — the entire safe harbor must come from your quarterlies.

Current penalty rate. Per IRS Revenue Ruling 2026-5 (IRB 2026-08), the individual underpayment rate for the calendar quarter beginning April 1, 2026, is 6% annualized (and was 7% for Q1 2026). The 8% figure many older articles cite applies only to large corporate underpayments — not to individual gig workers.

The OBBBA threshold trap. Because the 1099-NEC threshold for 2026 is $2,000, a part-time shopper who earned $1,800 won’t get a 1099 in January 2027 and may assume she owes nothing. Wrong. IRC §1402(a) still imposes SE tax on net earnings of $400 or more, and IRC §61(a) still taxes the income. Many shoppers will get a CP2000 notice from the IRS Automated Underreporter program two years later for income Maplebear voluntarily reported even below the threshold, or from bank-deposit cross-references.

The OBBBA changes that matter for Instacart Shoppers

The One, Big, Beautiful Bill Act (Pub. L. 119-21, July 4, 2025) rewrote a lot of the small-business tax code. The provisions that hit shoppers:

  • §70110 — Permanent §67 disallowance. Unreimbursed employee business expenses remain non-deductible. Doesn’t affect you as a 1099, but matters if you also have a W-2 day job.
  • §70432 — 1099-K threshold restored to $20,000 and 200 transactions.
  • §70433 — 1099-NEC threshold to $2,000 for payments after Dec. 31, 2025.
  • §70302 — §179 limit to $2,560,000 (2026 inflation-adjusted figure). Lets you fully expense a business vehicle in year one if you elect actual expenses. Most shoppers stick with standard mileage, but it matters if you bought a new car for Instacart.
  • §70301 — 100% bonus depreciation made permanent under §168(k) for property placed in service after January 19, 2025.
  • §70105 — §199A permanence + $400 minimum discussed above.
  • §70201 — “No Tax on Tips” deduction (new IRC §224). And this one is huge.

§224 — the OBBBA tip deduction does apply to grocery delivery

For tax years 2025 through 2028, new IRC §224 allows an above-the-line deduction of up to $25,000 of qualified tips, phased out for MAGI above $150,000 (single) or $300,000 (MFJ). The deduction reduces federal income tax — but not SECA self-employment tax.

The IRS’s final regulations (TD 10044, published in IRB 2026-18) confirm that gig workers and other self-employed individuals can qualify for this deduction if their occupation is on the List of Occupations that Receive Tips and the other statutory and regulatory requirements are met. The new law limits the deduction for self-employed individuals to the individual’s net income.

Grocery delivery is on the list. Treasury’s published list — Treasury Tipped Occupation Code 804 — “Goods Delivery People” — explicitly names “grocery delivery driver” as an illustrative example. The occupation description covers driving a truck or other vehicle over established routes or within an established territory to deliver goods such as food products, appliances, or furniture, or to pick up or deliver packages.

For Instacart Full-Service Shoppers, that means tips reported in Box 1b of the revised 2026 Form 1099-NEC (with TTOC 804 in Box 1c) flow to Part II of new Schedule 1-A (Form 1040) as a deduction. For Camila in the worked example, her $7,800 of in-app tips would knock another roughly $780 off her federal income tax (10% bracket × $7,800), pushing her federal income tax close to zero. The SE tax stays — §224 only reduces income tax.

For 2025, the IRS issued Notice 2025-62 giving payors penalty relief: Maplebear was not required to separately break out tips on the 2025 1099-NEC. Individual taxpayers may use a “reasonable method” to determine qualified tips per Notice 2025-69. Starting with 2026 reporting, Box 1b becomes mandatory.

Common mistakes Instacart Shoppers make

  • Not tracking mileage from day one. Reconstructed logs lose in Tax Court. See Velez, Khan, Garza.
  • Trusting the in-app mileage estimate. It misses the drive to the store and home, and between stores on doubles.
  • Not paying quarterly estimates. Triggers §6654 penalties (6% annualized for Q2 2026 individual underpayments per Rev. Rul. 2026-5).
  • Assuming Maplebear is a typo and they got the wrong 1099. Maplebear, Inc. d/b/a Instacart is the legal entity.
  • Missing the §199A deduction. Delivery is not an SSTB. Take the 20%.
  • Thinking tips aren’t taxable. All tips are gross income under §61(a). The new §224 deduction is a separate benefit on top.
  • Forgetting the EveryLastMile (or other tracker) subscription. It is deductible under §162.
  • Not knowing about the §224 tip deduction. Most of the open-web Instacart tax guides we reviewed for 2026 still don’t mention it.

The fix

The single best move an Instacart shopper can make for the 2026 tax year is to set up automatic mileage tracking on day one. EveryLastMile, an iOS mileage tracking app, uses on-device sensor fusion (not battery-draining background GPS) to capture every drive, classify it as business or personal, and produce an IRS-ready PDF log that satisfies §274(d) substantiation. It’s $3.99/month or $39.99/year — and it’s deductible on Schedule C, Line 27a.

For the in-app mileage gap and where the offer-card distance falls short, see Does Instacart Track Miles? (2026). The Walmart Spark sibling pillar — Walmart Spark Driver Tax Guide 2026 — covers the same Schedule C / SE tax / QBI mechanics for shoppers who run both apps. For the cross-platform delivery picture, see the Delivery Driver Mileage Tax Guide 2026. For the 72.5¢ rate, see the 2026 IRS Mileage Rate deep dive; for the commuting question (home-to-first-store and last-stop-to-home), see the IRS Commuting Rule explainer. California shoppers: read California Mileage Reimbursement (2026) for the Prop 22 interaction. In-Store W-2 employees who wandered into this article by mistake: the Employee Mileage Reimbursement by State (2026) guide explains why OBBBA §70110 killed your federal mileage deduction.

Frequently asked questions

Do I owe tax if I made less than $2,000 in 2026?

Yes. The $2,000 figure is the reporting threshold for Maplebear — it changes whether you get a 1099-NEC, not whether you owe tax. IRC §61(a) taxes all income; IRC §1402(a) subjects net earnings of $400+ to SE tax.

Do tips count as income for Instacart taxes?

Yes, every dollar. In-app tips are on your 1099-NEC Box 1; cash tips are not on the form but still go on Schedule C Line 1. The OBBBA §224 deduction (new for 2025–2028) lets you deduct up to $25,000 of qualified tips against income tax — but not SE tax.

Can I deduct my insulated bag and cooler?

Yes — Schedule C Line 22 (Supplies). The de minimis safe harbor at Treas. Reg. §1.263(a)-1(f) lets you expense items costing $2,500 or less per invoice.

What about Stride or Everlance — are those subscriptions deductible?

If you pay for a premium tier, yes, as ordinary and necessary business expenses under §162. Stride's free tier costs nothing, so there's nothing to deduct. Note that Instacart's longstanding partnership with Stride is for health-insurance discovery; the Stride Tax app is a separate product and not Instacart-funded.

What if I worked as an In-Store Shopper for part of the year and Full-Service for the rest?

You'll get both a W-2 and a 1099-NEC from Maplebear for the same year. W-2 wages go on Form 1040 Line 1a; 1099 income flows through Schedule C and Schedule SE. You cannot deduct In-Store-Shopper-job mileage because OBBBA §70110 made the §67 disallowance permanent.

What if I drive for Instacart AND DoorDash?

You file one Schedule C with combined gross receipts, or two separate Schedule Cs if the businesses are genuinely distinct. Most CPAs combine them as a single gig delivery trade or business. Mileage from both is added together. Income from both is added together for the §199A QBI deduction.

Am I a Maplebear contractor or an Instacart contractor?

Legally a Maplebear, Inc. independent contractor — Maplebear is the corporate name, Instacart is the d/b/a. The 1099-NEC says Maplebear.

What state am I taxed in?

The state where you live (your tax home). If you cross state lines for a single delivery, that doesn't usually create a tax filing obligation in the other state unless you have a fixed place of business there. Drivers who shop heavily across state lines should consult a CPA — apportionment rules can get fiddly.