Employees never see the system working: tax leaves every paycheck before they can miss it. Freelancers get no such service. If you earn money outside a W-2 job in the US, the IRS expects you to estimate your own tax and pay it in four instalments a year — and it charges penalties when you guess too low. Quarterly taxes frighten new freelancers more than almost anything else, but the maths is genuinely simple once you see it laid out. Here is how estimated taxes work, how to calculate yours, and how to pay without the April panic.
Why Freelancers Pay Quarterly
The US tax system is pay-as-you-go. Employees comply automatically through employer withholding; the self-employed must mimic that with estimated tax payments using Form 1040-ES. One payment covers two taxes at once: your regular federal income tax, and self-employment tax — the freelancer’s version of Social Security and Medicare contributions, charged at 15.3 per cent on 92.35 per cent of your net profit. Both are settled up on your annual return, where your quarterly payments count as credits against the final bill.
Who Has to Pay — and the Safe Harbours
The general rule: if you expect to owe at least $1,000 in tax for the year after subtracting any withholding and credits, you should be paying estimated tax. (If you also hold a W-2 job, extra withholding there can sometimes cover your freelance income instead.) Two safe harbours protect you from underpayment penalties even if your estimate is imperfect: pay at least 90 per cent of this year’s actual tax, or 100 per cent of last year’s total tax — 110 per cent if your adjusted gross income exceeded $150,000. Hitting either target means no penalty, whatever you end up owing in April.
The 2026 Quarterly Due Dates
- 15 April 2026 — for income earned 1 January to 31 March
- 15 June 2026 — for income earned 1 April to 31 May
- 15 September 2026 — for income earned 1 June to 31 August
- 15 January 2027 — for income earned 1 September to 31 December
Notice the periods are uneven — the second covers only two months. When a date lands on a weekend or federal holiday, it shifts to the next business day. Most states run their own estimated tax schedules too, often on different dates, so check your state’s tax website.
How to Calculate Your Payment, Step by Step
Step 1: Estimate your annual net profit — freelance income minus business expenses — using your year-to-date figures projected forward. Step 2: Work out self-employment tax: multiply net profit by 92.35 per cent, then by 15.3 per cent. Step 3: Estimate income tax: subtract half of your self-employment tax and the standard deduction (plus the qualified business income deduction, worth up to 20 per cent of profit for many freelancers) from your profit, then apply the federal tax brackets. Step 4: Add both taxes, subtract any withholding or credits, and divide by four.
Worked example: a freelancer expecting $80,000 of net profit owes roughly $11,300 of self-employment tax. After deducting half of that and the standard deduction, income tax might come to roughly $7,500 (before any QBI deduction), giving a total near $18,800 — about $4,700 per quarter. This is an illustration, not advice: your filing status, state and deductions move the real figure. A popular safety habit is to sweep 25 to 30 per cent of every client payment into a separate savings account the day it lands, so the money is always waiting.
How to Pay
The fastest route is IRS Direct Pay, which takes the money straight from your bank account free of charge — always select “Estimated Tax” and the correct tax year. You can also pay through your IRS online account, by card (a processor fee applies), through EFTPS, or by mailing a cheque with a 1040-ES voucher. Keep the confirmation number for every payment; you will need the totals when you file. States have their own online payment portals for state estimated tax.
What If You Underpay or Miss a Date?
The underpayment penalty works like interest — the federal short-term rate plus three percentage points, calculated for the days each instalment was short. It is annoying, not catastrophic, and paying as soon as you realise stops it growing. If your income is lumpy — say, most of it arrives in autumn — the annualised instalment method on Form 2210 lets you match payments to when money actually arrived and can legitimately erase penalties that the even-split method would create. First-year freelancers often get a shock; after one cycle, the amounts become predictable.
Conclusion
Quarterly taxes are just your annual tax bill paid in advance, in four dated slices. Estimate your profit, apply the self-employment and income tax maths (or last year’s safe harbour), pay through Direct Pay by 15 April, 15 June, 15 September and 15 January, and keep a percentage of every invoice ring-fenced as you go. Do that, and tax season becomes a reconciliation exercise — not a financial ambush. When your income grows or your situation complicates, one meeting with a CPA usually pays for itself.