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Quarterly Estimated Tax Calculator for Gig Workers (2026)

By Jin JeongUpdated Checked against IRS Form 1040-ES and Form 2210 instructions

How much do you actually have to send the IRS each quarter to avoid the underpayment penalty? Enter your 2026 earnings and last year's tax. The calculator finds the safe-harbor amount, the due dates, and what is left after what you already paid. All amounts are in US dollars (USD) and nothing you type leaves your browser.

72.5¢ per mile
76¢ per mile
The "total tax" line on your 2025 Form 1040. Leave 0 if you did not file.
Adjusted gross income on the 2025 Form 1040.
Pre-selected from today's date.
Advanced: W-2 job and payments already made
Safe-harbor amount for all of 2026
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Still to pay
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Per remaining payment
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Expected 2026 federal tax
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Balance when you file

PaymentDueEqual shareRemaining plan

Federal only, in USD. This is a planning estimate, not tax advice. The balance when you file is the tax you will still owe in April if you pay only the safe-harbor amount; it carries no underpayment penalty. How we calculate.

How to use this calculator

  1. Enter your expected 2026 earnings, tips, miles, and expenses. The calculator runs the same engine as our 1099 gig tax calculator to estimate your federal income tax plus self-employment tax.
  2. Enter last year's total tax and AGI from your 2025 Form 1040. This is what unlocks the second, often smaller, safe-harbor target. If you did not file last year, leave the tax at 0 and the calculator uses 90% of this year's tax.
  3. Pick the next payment you still need to make and enter what you already paid, including withholding from a W-2 job.

What the result means

"Safe-harbor amount" is the least you must have paid in for 2026, through payments plus withholding, to owe no underpayment penalty. It is the smaller of 90% of your expected 2026 tax and 100% of last year's tax (110% if last year's AGI was over $150,000, or $75,000 if you are married filing separately).

"Still to pay" subtracts what you have already paid and withheld. "Per remaining payment" splits that evenly over the due dates that are still ahead.

"Balance when you file" is the honest part. Safe harbor protects you from the penalty, not from the bill. If last year's income was low, you can meet it by paying a small amount and still owe thousands in April. Set that difference aside; the set-aside percentage tells you how much of each payout.

The 2026 payment calendar

PaymentIncome earned in the periodDue
Q1Jan 1 – Mar 31, 2026April 15, 2026
Q2Apr 1 – May 31, 2026June 15, 2026
Q3Jun 1 – Aug 31, 2026September 15, 2026
Q4Sep 1 – Dec 31, 2026January 15, 2027

If a due date lands on a weekend or legal holiday, the next business day counts as on time.

Three examples

Each is a federal-only run of the same engine used in the calculator, with 2026 figures. The last-year numbers are assumptions chosen to show how the rule behaves.

1. Full-time driver, income steady

Single. Expects $48,000 of earnings ($14,000 tips), 18,000 business miles, $900 of expenses. Last year's total tax was $2,900 with an AGI of $28,000. Nothing paid yet.

2. Driver whose income doubled

Single. Last year was a part-time year with total tax of $3,500 and AGI of $26,000. This year the driver expects $90,000 of earnings, drives 30,000 miles, and has $1,500 of expenses.

This is the case where the rule is easy to misread. The penalty is avoided, but nearly $10,000 is still owed in April. Paying more than the minimum, or saving the gap separately, is the practical move.

3. Higher earner with a day job: the 110% rule

Single. Earns $160,000 in wages with $30,000 federal tax withheld, plus $60,000 of gig earnings and 16,000 miles. Last year's total tax was $38,000 on an AGI of $190,000, so the prior-year test uses 110%. It is early September, so the next payment is the third one and nothing has been sent separately.

How the calculation works

  1. Expected federal tax = income tax + self-employment tax from the 2026 engine (no state tax).
  2. Current-year target = 90% of expected tax.
  3. Prior-year target = 100% of last year's total tax, or 110% if last year's AGI was over $150,000 ($75,000 for married filing separately this year).
  4. Safe-harbor amount = the lesser of the two. With no prior-year tax entered, it is the current-year target.
  5. Still to pay = safe-harbor amount − withholding − estimated payments already made, never below zero. It is zero when you will owe less than $1,000 after withholding.
  6. The remainder is split evenly over the due dates still ahead.

The safe harbor is one of several ways to avoid the penalty. You can also use the annualized income method on Form 2210, which can help drivers whose earnings are uneven during the year.

Frequently asked questions

What is the safe harbor for estimated taxes?

It is a payment target that protects you from the underpayment penalty even if your actual tax turns out higher. You meet it if your payments and withholding for the year add up to at least the smaller of 90% of this year's tax or 100% of last year's total tax. If last year's adjusted gross income was over $150,000, the second number is 110% of last year's tax.

When is the 110% rule used?

When your adjusted gross income on last year's return was more than $150,000, or more than $75,000 if you file married filing separately this year. In that case, 110% replaces 100% in the prior-year test. The calculator switches automatically when you enter last year's income.

Do I have to make quarterly payments at all?

Generally, you need to make estimated payments if you expect to owe $1,000 or more after subtracting withholding and credits. Below that, there is no underpayment penalty. A gig worker with a W-2 job may be able to skip payments by raising withholding on the W-4 instead.

What are the 2026 due dates?

April 15, June 15, and September 15, 2026, and January 15, 2027. If a due date falls on a weekend or legal holiday, the payment is on time on the next business day. The January payment is not needed if you file your 2026 return by February 1, 2027 and pay the full balance with it.

Are the four periods equal in length?

No. The IRS periods are January 1 to March 31, April 1 to May 31, June 1 to August 31, and September 1 to December 31. That is why the payments are called quarterly even though the second period is only two months long.

What if I pay the safe-harbor amount but my real tax is much higher?

You still owe the difference when you file, but you will not owe an underpayment penalty. This is what the "balance when you file" line shows. Drivers whose income jumped from last year often use this on purpose, then set the rest aside in savings.

Does my W-2 withholding count?

Yes. Federal tax withheld from a paycheck is treated as paid evenly through the year, even if it was withheld late, which makes withholding a flexible way to fix a shortfall. Enter it under the withholding box.

What if I forgot the first three payments?

Pick the next payment that is still ahead in the dropdown. The calculator spreads the amount you still need across the remaining due dates. You may owe a small penalty for the missed installments, which works like interest on the shortfall for the days it was late, and the Form 2210 can figure it exactly.

How do I pay?

The IRS accepts payments through IRS Direct Pay, through your IRS online account, by debit or credit card, or by mailing a check with a Form 1040-ES voucher. Choose "estimated tax" and the tax year 2026 when you pay.

Does this include state estimated tax?

No. This calculator covers federal estimated tax only. Many states have their own quarterly payments and safe harbors, so check your state revenue department.

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