The first year of 1099 income comes with a nasty surprise that nobody warns you about: there's no employer quietly withholding taxes from every paycheck anymore. The full bill lands in April, often bigger than expected because it includes self-employment tax — and then the IRS adds an underpayment penalty on top, for not having paid throughout the year. Two unpleasant shocks in one envelope.
The fix is quarterly estimated taxes, and the good news is they're far less mysterious than they sound. There's even a rule that lets you stop trying to predict the future and still avoid the penalty entirely. Here's how it works for 2026.
A note up front: this is general information for U.S. self-employed filers, not advice on your specific situation — a CPA or EA can run your exact numbers.
Who owes, and when
You generally need to pay estimated taxes if you expect to owe $1,000 or more in tax for the year after subtracting any withholding. For most full-time freelancers and 1099 contractors, that's a yes.
The payments are quarterly, and the 2026 schedule is:
- Q1 — April 15, 2026
- Q2 — June 15, 2026
- Q3 — September 15, 2026
- Q4 — January 15, 2027
Notice the calendar is lopsided — the "quarters" aren't even three months apart. Q2 covers only two months after Q1, and Q4 stretches into the next January. Treat these as fixed deadlines, not a tidy every-three-months rhythm, or you'll miss one by assuming it's later than it is. (One nice escape hatch: if you file your return and pay in full by January 31, you can skip the Q4 payment.)
The safe harbor: the part that ends the guesswork
This is the single most useful thing to understand about estimated taxes, because it removes the need to forecast your income perfectly.
The IRS won't charge an underpayment penalty if you pay at least the smaller of:
- 90% of your current year's tax, or
- 100% of last year's tax — rising to 110% if your prior-year adjusted gross income was over $150,000 (over $75,000 if married filing separately).
The 90%-of-current-year route requires forecasting income you don't have yet, which is hard in a variable freelance year. The prior-year route is the gift: it's a fixed, known number from a return you've already filed. Pay 100% of last year's tax (110% if you're a higher earner) across the four installments, and you're penalty-safe — even if you end up earning much more this year and owing more in April. You'll still owe the rest at filing, but no penalty.
For anyone with lumpy income, basing your quarterlies on the prior-year safe harbor is usually the lowest-stress path. You know the target on January 1.
How much to actually set aside
Estimated tax covers two things at once, which is why the bill feels heavy: your income tax and self-employment tax. Self-employment tax is 15.3% (Social Security and Medicare) on 92.35% of your net self-employment earnings — that's the piece an employer used to split with you, now entirely yours.
For a new freelancer without a prior-year number to lean on, a reasonable rule of thumb is to set aside 25–30% of your net 1099 income as you earn it. That won't be exact — your bracket, deductions, and state taxes all move it — but it keeps you from spending money that was never really yours. The IRS Form 1040-ES package includes a worksheet that gets you to a sharper number if you want one, and remember your deductions (like the home office and vehicle deductions) reduce the income this is calculated on.
How to pay (and a trick for uneven income)
Paying is the easy part. You can pay online through IRS Direct Pay or the EFTPS system, or mail a Form 1040-ES voucher each quarter. Most states have their own estimated-tax system in parallel, so check yours — state rules can differ from the federal ones.
Two tactics worth knowing:
- Withholding counts as paid evenly. If you (or a spouse) also have W-2 wages, increasing that withholding via a Form W-4 is treated as paid throughout the year — sometimes a cleaner way to hit the safe harbor than four separate payments.
- The annualized income installment method. If your income is genuinely seasonal — big in some quarters, thin in others — this method lets you match your payments to when you actually earned the money, rather than paying a flat quarter each time. It's more paperwork, but it prevents overpaying early in a lumpy year.
The system that makes this painless
Strip it down and quarterly taxes come to three habits: know your safe-harbor number, set money aside as you earn, and pay on the four dates. The freelancers who get blindsided are the ones who treat tax as an April event; the ones who sail through treat it as a monthly reflex.
A separate savings account for the set-aside helps enormously — money you move out the day you're paid is money you won't accidentally spend. And the whole calculation gets easier when your income and deductible expenses are tracked as they happen rather than reconstructed under deadline pressure: your quarterly estimate is only as good as your knowledge of what you've earned and what you can deduct. Keeping those records current — captured when they happen, kept somewhere you control, which is the job Starlog is built for — is what turns the quarterly payment into a five-minute task instead of a scramble.