Quarterly estimated taxes in 2026: dates, safe harbours and a worked calculation
If you are self-employed, run a business, freelance, or have significant income nobody withholds tax from, the IRS expects to be paid as you earn - not in April. Miss that and you owe a penalty even if you pay the full bill on time at filing.
This guide covers who has to pay, the 2026 due dates, the safe harbour rules that make the penalty impossible to incur, a fully worked calculation using the 2026 figures, what to do when income is uneven, and how to actually pay.
Who has to pay
The test is not whether you are self-employed. It is whether enough tax is being paid in during the year.
| You probably owe estimated tax if | You probably do not if |
|---|---|
| You have Schedule C, 1099 or freelance income with no withholding | Your W-2 withholding already covers your total tax |
| You are a partner, an S corporation shareholder, or take K-1 income | You expect to owe under $1,000 after withholding and credits |
| You have substantial investment income, capital gains, or rental income | You had no tax liability at all last year and were a US citizen or resident for the whole 12-month year |
| You are a landlord, a gig worker, or newly self-employed | - |
| You sold an asset with a large gain this year | - |
The 2026 due dates
| Payment | Income period it covers | Due |
|---|---|---|
| Q1 | 1 January - 31 March 2026 | 15 April 2026 |
| Q2 | 1 April - 31 May 2026 (two months, not three) | 15 June 2026 |
| Q3 | 1 June - 31 August 2026 | 15 September 2026 |
| Q4 | 1 September - 31 December 2026 | 15 January 2027 |
Note the second row. These are not equal quarters - the second period is two months long and the fourth is four. Every 2026 date falls on a weekday, so no weekend or holiday shift applies.
15 April 2026 does triple duty: your 2025 return or extension is due, your Q1 2026 estimated payment is due, and it is the last day for 2025 IRA and HSA contributions. Filing an extension for the return does not extend the estimated payment.
The safe harbour: how to make the penalty impossible
Under section 6654 of the Internal Revenue Code, no underpayment penalty applies if your total payments - withholding plus timely estimated payments - reach the smaller of two amounts.
| Route | What you must pay in | Best when |
|---|---|---|
| Current-year | 90% of your 2026 tax | Your income is falling, so last year's tax is a bad guide |
| Prior-year | 100% of your 2025 total tax | Your 2025 AGI was $150,000 or less. Simplest and most certain |
| Prior-year, higher earner | 110% of your 2025 total tax | Your 2025 AGI was over $150,000, or over $75,000 if married filing separately |
You only need to satisfy one. The prior-year route is the one most practitioners use, because it requires no forecasting: take the total tax line from last year's Form 1040, apply 110 per cent if the AGI test bites, divide by four, and pay that on each date. Your income can triple and the penalty still cannot apply.
A full worked calculation, 2026 figures
Meet a single freelancer with $95,000 of net profit on Schedule C, no W-2 income and no withholding. This is the whole calculation, in order.
| Step | Calculation | Amount |
|---|---|---|
| Net profit | Schedule C | $95,000 |
| Net earnings subject to SE tax | $95,000 x 92.35% | $87,733 |
| Self-employment tax | $87,733 x 15.3% | $13,423 |
| Deduction for half of SE tax | $13,423 / 2 | ($6,712) |
| Adjusted gross income | $95,000 - $6,712 | $88,288 |
| Standard deduction, single, 2026 | ($16,100) | |
| Taxable income before QBI | $72,188 | |
| Qualified business income deduction | 20% of the lesser of QBI or taxable income | ($14,438) |
| Taxable income | $57,750 | |
| Income tax | 10% to $12,400, 12% to $50,400, 22% above | $7,417 |
| Total 2026 tax | $13,423 + $7,417 | $20,840 |
| Each quarterly payment | $20,840 / 4 | $5,210 |
Three things worth noticing. Self-employment tax is the larger number - $13,423 against $7,417 of income tax - which is exactly why new freelancers who budget using income tax brackets alone come up short. The effective rate on $95,000 of profit is about 21.9 per cent, not the 22 per cent marginal bracket and not the 12 per cent people assume from the bracket table. And the QBI deduction is worth $3,176 here, so leaving it out of your estimate means overpaying all year.
Self-employment tax, in detail
| Component | Rate | Applies to |
|---|---|---|
| Social Security | 12.4% | Net SE earnings up to the 2026 wage base of $184,500 |
| Medicare | 2.9% | All net SE earnings, no cap |
| Combined | 15.3% | Applied to 92.35% of net profit |
| Additional Medicare | 0.9% | Earnings above $200,000 single or $250,000 married filing jointly |
Two mechanics that reduce the sting. The 15.3 per cent applies to 92.35 per cent of net profit rather than all of it, and half of the resulting SE tax is deductible in arriving at AGI. Neither is optional or a planning choice - both are built into the form. SE tax starts at $400 of net earnings, which is a far lower entry point than most people expect.
What the penalty actually costs
The underpayment charge is interest-like rather than a flat fine. It runs at the federal short-term rate plus three percentage points, set quarterly, and stands at 7 per cent annualised for 2026. It is computed separately for each of the four periods.
That last point catches people out. If you skip Q1 and catch up in Q3, you still owe a charge on the Q1 shortfall for the period it was outstanding, even though your total payments for the year end up above the safe harbour. Timing is part of the test, not just the total.
The penalty is computed on Form 2210, and the IRS will often calculate it for you if you leave the line blank. There is a waiver route for casualty, disaster, or retirement or disability in the year concerned, but it is narrow.
Chartered Advisory projects your annual liability, sets the safe harbour that costs you least, and builds the quarterly schedule so nothing is missed.
Avail our tax planning servicesWhen income is uneven
The default assumption is that you earned evenly across the year. If you did not - a consultant with one large Q4 project, a seller whose year is made in December, anyone who sold an asset in August - paying a flat quarter of the annual figure in April can mean paying tax on money you have not earned yet.
The fix is the annualised income installment method on Schedule AI of Form 2210. It recomputes each period's required payment from income actually earned by that point, which lets small early payments stand and larger later ones catch up without penalty.
| Even method | Annualised method | |
|---|---|---|
| Effort | Minimal | Real - Schedule AI, four times |
| Best for | Steady income through the year | Lumpy or back-loaded income |
| Cash flow | Can require paying before you have earned | Payments follow the income |
| Record-keeping | Light | You need income by period, so books must be current |
If you use the annualised method, your bookkeeping has to be up to date within each period. That is often the real constraint, not the arithmetic.
How to pay
- IRS Direct Pay - free, straight from a bank account, no registration needed. Fine for most people.
- EFTPS - free, requires enrolment, and lets you schedule payments in advance. Better if you want all four dates set up in January and then forgotten.
- Card - works, but processors charge a fee.
- Form 1040-ES vouchers by post - still accepted. Slower, and you carry the proof-of-posting risk.
Whichever you use, tag the payment to the right year and the right form. Payments applied to the wrong tax year are one of the most common and most tedious errors to unwind.
A worksheet to run each quarter
Do not forget the states
Most states with an income tax run their own estimated payment regime, with their own thresholds, their own safe harbours and their own portals. The dates often mirror the federal ones but not always, and paying the IRS does nothing for your state. Nine states have no personal income tax at all: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington and Wyoming.
The mistakes that cost the most
- Assuming an extension covers the payment. It does not. The Q1 date and the filing date share 15 April, and only one of them moves.
- Budgeting with income tax brackets only. Self-employment tax is often the bigger number.
- Missing the 110 per cent rule. If prior-year AGI was over $150,000, paying 100 per cent leaves you short and penalised.
- Skipping a quarter and catching up later. The penalty is computed per period.
- Ignoring the QBI deduction when projecting, and overpaying all year.
- Forgetting state estimates entirely.
- Paying from the business account without recording it. An owner's tax payment is a draw, not a business expense.
- Not adjusting after a big one-off gain. Sell an asset in August and the Q3 payment needs to reflect it.
Sources
This guide is written against the official and clearly labelled professional references below. Rates, thresholds and portal procedures change between reviews, so open the primary source before relying on a figure.
- About Form 1040-ES, Estimated Tax for Individuals (IRS)
- Businesses (Internal Revenue Service)
- About Publication 334, Tax Guide for Small Business (IRS)
Questions people also ask
How do I know if I have to make estimated payments at all?
The general rule is that you must pay if you expect to owe $1,000 or more in tax for the year after subtracting withholding and refundable credits. There is also an exception if you had no tax liability at all in the prior year and were a US citizen or resident for that entire 12-month year. Everyone else with meaningful unwithheld income is in scope.
What happens if I just pay everything in April when I file?
You will owe an underpayment charge even though the tax itself is paid in full. Section 6654 requires the tax to be paid as income is earned, and the charge is computed separately for each of the four periods, running at the federal short-term rate plus three points - about 7 per cent annualised for 2026.
Is the safe harbour based on last year's tax or last year's income?
Last year's total tax - the total tax line on your prior-year Form 1040, not your income and not what you owed at filing after withholding. Your prior-year AGI matters for one thing only: if it exceeded $150,000 ($75,000 married filing separately), the prior-year safe harbour becomes 110 per cent instead of 100 per cent.
My income is completely unpredictable. What should I do?
Two options. The simplest is the prior-year safe harbour, which fixes your required payment regardless of what happens this year. If the prior year was unusually high, or you would rather match payments to actual earnings, use the annualised income installment method on Schedule AI of Form 2210 - it recomputes each period from income actually earned, but it requires books that are current within each period.
I have a W-2 job as well as freelance income. Can I avoid quarterly payments?
Often yes, and this is usually the better answer. Increase the withholding on your W-2 so it covers the whole projected liability. Withholding is treated as paid evenly across the year regardless of when it was actually taken, so it can even cure an earlier shortfall in a way a late estimated payment cannot.
Send the tax year and the transaction or filing involved, and we will tell you what is actually required.
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