Q3 Estimated Taxes Are Due September 15: A Gig Driver's Checklist

If you deliver for DoorDash, Uber Eats, Instacart, or any other 1099 platform, nobody withholds a cent of tax from your pay. The IRS expects you to send it in yourself — roughly four times a year. The third payment of 2026 is due September 15, and it covers what you earned from June through August.

Here's the good news: for a lot of drivers, the check is much smaller than they fear — and for many part-timers, no check is required at all. The difference comes down to one thing: whether your mileage log is doing its job. Here's the whole picture in one checklist.

The 2026 Payment Schedule

Step 1: Do You Even Have to Pay?

Two different rules get mixed up constantly in driver groups, so let's separate them:

• The quarterly rule: you're expected to make estimated payments only if you'll owe $1,000 or more in federal tax for the year, after subtracting any withholding and credits. Under that line? You can legally settle the whole thing when you file in April — no quarterlies, no penalty.
• The filing rule: completely separate. $400 or more in net self-employment earnings means you must file a return, because self-employment tax (Social Security and Medicare) kicks in at that point — even in years when your income tax is zero.

Step 2: If You Do Owe, How Much to Send

You don't need a CPA for a reasonable Q3 estimate. Work from net profit, not gross:

1. Total what you earned June 1 – August 31 across all platforms (including cash tips).
2. Subtract your business deductions for the same window — mileage is almost always the biggest. Remember 2026 is a split-rate year: $0.725/mile through June 30, $0.76/mile from July 1.
3. Set aside roughly 25–30% of that net number for self-employment plus income tax, and send it. Even a partial payment beats none — penalties are computed on the shortfall.

Prefer to be exactly safe instead of estimating? The IRS "safe harbor" says no underpayment penalty applies if your total 2026 payments cover 90% of this year's tax or 100% of last year's tax (110% if your adjusted gross income was over $150,000). If you had a tax bill last year, dividing that number by four is the lazy-but-legal target.

Step 3: How to Actually Pay

• IRS Direct Pay (directpay.irs.gov) — free bank transfer, no account needed. Choose "Estimated Tax," form 1040-ES, tax year 2026.
• Your IRS Online Account — same thing, plus you can see every payment you've made (useful at filing time).
• EFTPS — the Treasury's payment system; better if you want scheduled payments.
• Old school: mail a check with a Form 1040-ES voucher, postmarked by September 15.

Whatever you use, save the confirmation. Estimated payments are the number-one thing drivers forget to tell their tax preparer about in April.

Missed Q1 and Q2? Don't Wait for the Deadline

The underpayment penalty works like interest: it accrues per quarter, per day, until the missed amount is paid. That means paying something today is strictly better than paying the same amount on September 15 — and enormously better than waiting for April. There's no form to file and nothing to confess; just make the payment and the math takes care of itself when you file.

One more escape hatch: if you also have a W-2 job, you can raise your paycheck withholding for the rest of the year instead of making estimated payments. Withholding is treated as if it were paid evenly across all four quarters — even when it all lands in November and December — which can retroactively erase an underpayment.

The Real Lesson: the Log Decides the Number

Every step above gets easier — and cheaper — when your mileage log is complete. At 2026 rates, every 1,000 business miles you can substantiate is roughly $725–$760 off your taxable profit, which flows straight into a smaller quarterly payment. Miles you drove but didn't record are the most expensive kind: you paid for the gas and the tax.

GigLedger tracks those miles automatically by GPS, values each trip at the correct split-year rate, and shows a running quarterly estimate with a set-aside number all year — so September 15 is a glance at a screen, not a weekend with a spreadsheet.