Quarterly Estimated Taxes for Freelancers: Safe Harbor and a Worked Example
October 29, 2026
Employees have tax withheld from each paycheck. Freelancers and business owners have to send estimated payments to the IRS (and often the state) during the year. The estimates cover income tax and self-employment tax, which funds Social Security and Medicare.
Self-employment tax is 15.3% of 92.35% of net earnings (12.4% Social Security up to the wage base plus 2.9% Medicare). On $80,000 of net profit, the taxable base is $80,000 × 0.9235 = $73,880, and the tax is $73,880 × 0.153 = $11,304. Half of it ($5,652) is deductible when computing income tax.
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Net profit $80,000. Self-employment tax: $11,304. Suppose income tax after the standard deduction, the deduction for half of the SE tax, and other items is about $9,000 (an assumption for illustration; your result depends on filing status and deductions). Total annual tax: $20,304. Divided into four payments: $5,076 each. A simple rule of thumb is to set aside 25% to 30% of net income in a separate account: 28% of $80,000 is $22,400, which would cover the estimate with a cushion.
Payments are due April 15, June 15, September 15, and January 15 of the following year, which means the quarters are unequal (the second period is only two months).
| Item | Amount |
|---|---|
| Net profit | $80,000 |
| SE tax base (92.35%) | $73,880 |
| Self-employment tax (15.3%) | $11,304 |
| Assumed income tax | $9,000 |
| Total annual estimate | $20,304 |
| Quarterly payment | $5,076 |
Safe Harbor Rules
You generally avoid an underpayment penalty if you pay at least 90% of this year's tax, or 100% of last year's tax (110% if last year's adjusted gross income exceeded $150,000), through withholding and estimates. If last year's tax was $12,000, then paying $3,000 per quarter satisfies the safe harbor, even if this year's income is higher; you'd then owe the balance in April without a penalty. This is useful when income is rising or uneven. The annualized income method lets you match payments to when income was earned.
Practical Tips
Open a separate savings account for taxes and transfer a percentage of each payment received. Pay online through IRS Direct Pay or the Electronic Federal Tax Payment System, and check your state's separate schedule. Track business expenses and deductions throughout the year, such as the home office, mileage, health insurance premiums, and retirement contributions (a SEP IRA or Solo 401(k) can reduce the tax significantly). Revisit the estimate each quarter if income changes.
Caveats
The Social Security portion of SE tax stops at the annual wage base, and high earners owe an additional Medicare tax. Rules and thresholds change, so confirm with IRS Form 1040-ES instructions or a tax professional. This article is general information, not tax advice.
Frequently Asked Questions
What is the self-employment tax rate?
15.3% of 92.35% of net earnings, up to the Social Security wage base for the 12.4% part.
When are the quarterly estimates due?
April 15, June 15, September 15, and January 15.
What is the safe harbor?
Paying 90% of this year's tax or 100% of last year's (110% for high earners).
How much should I set aside?
A common rule of thumb is 25% to 30% of net profit.
Can retirement contributions lower the bill?
Yes, such as SEP IRA or Solo 401(k) contributions.