Quarterly estimated taxes, explained

United States · tax year 2026 · Updated 3 September 2026 · about 7 minutes

The US tax system is pay-as-you-go. An employee satisfies that automatically — their employer withholds tax from every paycheck. Nobody withholds anything from a client's payment to a freelancer, so the job of paying throughout the year falls to you, four times a year, in the form of estimated tax payments.

This guide covers who has to pay, what you're actually paying, when, and how to avoid the penalty. It's general information, not tax advice — for anything unusual, an accountant who knows your state is worth the fee.

Who has to pay

The general rule: if you expect to owe at least $1,000 in federal tax for the year after subtracting withholding and refundable credits, you're expected to make estimated payments. For most full-time freelancers, that's a yes from the first profitable year.

Two common situations where you might not need to:

• You have a W-2 job alongside freelancing. Instead of making estimated payments, you can increase withholding at that job by filing a new Form W-4. Withholding is treated as paid evenly across the year no matter when it actually happened, which makes it a genuinely useful fix late in the year.
• Your freelance income is small. Under the $1,000 threshold, the requirement doesn't bite — though you'll still owe the tax at filing time.

What you're actually paying: two taxes, not one

Estimated payments cover both federal income tax and self-employment tax. The second one is the surprise.

Self-employment tax (15.3%)

Employees pay 7.65% of their wages toward Social Security and Medicare, and their employer pays a matching 7.65%. Self-employed people are both parties, so they pay the whole 15.3%: 12.4% for Social Security and 2.9% for Medicare.

Three things soften it:

• It applies to 92.35% of your net profit, not all of it.
• The Social Security portion stops at the annual wage base — $184,500 for 2026. Above that, only the 2.9% Medicare part continues (plus an extra 0.9% on earnings above $200,000, or $250,000 for joint filers).
• Half of what you pay is deductible against your income tax.

Note what it applies to: net profit, meaning revenue minus business expenses. Tracking expenses properly isn't bookkeeping neatness, it directly reduces two taxes at once.

Federal income tax

Normal brackets, applied to your taxable income after the standard deduction ($16,100 single, $32,200 married filing jointly, $24,150 head of household for 2026) and after the qualified business income deduction, which lets most self-employed people deduct another 20% of business income. That deduction is substantial and frequently forgotten in back-of-envelope estimates — it's why a flat "set aside 30%" rule usually overshoots for lower incomes and undershoots for higher ones.

The 2026 due dates

They aren't quarters. The second period is two months, the fourth is four. If a date lands on a weekend or holiday it moves to the next business day — none of the 2026 dates do.

The safe harbor: how not to be penalised

The penalty for underpaying is calculated per period, so paying a large amount in December doesn't undo a missed April payment. But the rules give you a guaranteed way out. You're safe if you pay either:

• 90% of what you end up owing this year, or
• 100% of what you owed last year — 110% if your prior-year AGI was over $150,000.

The second route is the useful one. It's a fixed, knowable number based on a return you've already filed, so a year that turns out much better than expected can't produce a penalty. You'll still owe the difference in April — the safe harbor prevents the penalty, not the tax — but you keep the cash in the meantime.

How to pay

Directly to the IRS, electronically, in a couple of minutes:

• IRS Direct Pay — bank transfer, no account needed, no fee. Choose "Estimated Tax" and the correct tax year.
• EFTPS — free, requires enrolment, keeps a payment history. Better if you want records in one place.
• Card — works, but processors charge a fee.

Save the confirmation. You'll want the total when you file, and it's the only proof if a payment is ever misapplied.

Don't forget your state

Everything above is federal. Most states with an income tax run their own estimated payment system, with their own dates and rules, and a few have city taxes on top. A freelancer who budgets perfectly for federal and forgets state is the most common version of a nasty April.

Four mistakes worth avoiding

• Spending the tax money. Money in your account isn't yours until tax is set aside. A separate savings account you transfer into on every client payment is unglamorous and works better than any rule of thumb.
• Forgetting self-employment tax. This is the one that produces five-figure surprises. It starts at the first dollar of profit — there's no standard deduction shielding it.
• Not tracking expenses. Every legitimate business expense reduces both income tax and self-employment tax. Reconstructing a year of receipts in April is how deductions get lost.
• Assuming a 1099 defines your income. You owe tax on all business income, whether or not a client sends a form. For 2026 the reporting threshold rose from $600 to $2,000, so more small clients will send nothing at all — that changes their paperwork, not your obligation.

Related

If the tax bill looks large next to what you're actually clearing, the issue is often the rate: see how to set your freelance rate. For getting paid in the first place, invoicing basics.

Figures cited are the 2026 amounts from IRS Rev. Proc. 2025-32, the Social Security Administration's 2026 wage base, and IRS guidance on estimated tax. This is general information, not tax advice.

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