Estimated taxes for the self-employed: a quick primer
If you're a freelancer or business owner, your tax bill won't wait until April. Here's how quarterly estimates work and how to size them right.
The U.S. tax system is "pay as you go." W-2 employees don't notice this because their employer withholds tax from every paycheck. Self-employed people don't have that automatic mechanism — so they have to send the IRS a check four times a year on their own.
Get the timing or the amount wrong and the IRS charges interest. Get it right and tax season becomes uneventful.
Who has to make estimated payments
You generally need to pay estimated taxes if you'll owe at least $1,000 in tax for the year after withholding and refundable credits. Common scenarios:
- Freelancers, consultants, gig workers — anyone with significant 1099 income
- Business owners receiving K-1 distributions
- S-Corp owners whose payroll withholding doesn't cover their full tax
- Investors with significant dividend, interest, or capital gain income
- Retirees taking IRA distributions without withholding
- Landlords with profitable rental income
The four payment dates
Estimated tax payments cover quarterly periods, but the periods aren't even quarters and the dates aren't memorable.
| Income earned | Payment due |
|---|---|
| January 1 – March 31 | April 15 |
| April 1 – May 31 | June 15 |
| June 1 – August 31 | September 15 |
| September 1 – December 31 | January 15 of following year |
If a deadline falls on a weekend or federal holiday, it shifts to the next business day. Pay through IRS Direct Pay, EFTPS, or Form 1040-ES vouchers in the mail.
The "safe harbor" rules
To avoid an underpayment penalty, your total tax payments (withholding + estimates) for the year must equal or exceed the smaller of:
- 90% of your current year's total tax liability, or
- 100% of last year's total tax liability (110% if your prior-year AGI was over $150,000).
The second test is the easier one to plan around: just match what you paid last year. If your income went up significantly, you may still owe a balance in April — but you won't owe a penalty as long as you hit the safe harbor.
Sizing your payments
For most self-employed clients, a working estimate is 25–30% of net business profit for the federal portion, divided into four equal payments. This covers:
- Self-employment tax (15.3% on the first $176,100 of net SE income for 2025)
- Federal income tax (typically 12–24% bracket for most clients)
- Additional Medicare tax (0.9% above $200K single / $250K MFJ)
The right percentage depends on your filing status, other income, deductions, and how much salary your spouse earns. A 90-minute conversation with us at the start of the year usually nails the right number for the rest of the year.
The penalty math
The underpayment penalty is calculated as if it were interest — currently around 8% annualized — on each shortfall, from the date that quarter's payment was due until the date it was eventually paid (or April 15 of the following year, whichever is earlier).
The penalty isn't ruinous, but it's not nothing. On a $20,000 underpayment for a full year, it's roughly $1,600 — a meaningful amount of money to avoid by sending the right check on the right day.
The W-2 spouse loophole (sort of)
Withholding on a W-2 is treated as if paid evenly throughout the year, regardless of when it actually happened. So if your spouse has W-2 income and you're behind on estimates, you can increase their withholding for the rest of the year and effectively cure the entire year's shortfall — no penalty.
This is one of the cleanest year-end fixes available. Just have your spouse file a new W-4 with their employer to bump up withholding for November and December paychecks.
What about state taxes?
Texas residents are spared state income tax estimates. If you live in or earn income from another state, you'll likely owe state estimates too — usually on the same federal schedule, but with separate forms and addresses.
The bottom line
Estimated taxes aren't optional, and the underpayment penalty is easy to trigger. The simplest planning move is to lock in the safe harbor (100%/110% of prior-year tax) early in the year, then revisit at mid-year if your income has changed dramatically.
If you'd like help setting up a year of estimated payments — or fixing a quarter you missed — get in touch.
This article is general information, not personalized tax advice. Penalty rates and thresholds change. Always consult a tax professional for your specific situation.