When you left a W-2 job to work for yourself, nobody withheld taxes from your first invoice. Not your bank, not your client, not the app you use to send invoices. That job now belongs to you, and the IRS wants its cut four times a year instead of once.
At Dahir Tax & Accounting, we field a wave of calls every September from clients who forgot a payment was due and want to know how much trouble they’re in.
This guide covers who actually owes quarterly payments, what the 2026 deadlines are, how to land on the right amount, and what a missed payment costs in real dollars.
Key Points
- The 2026 payment periods are uneven, not four equal three month blocks, and the IRS charges daily compounding interest on anything paid late.
- You can avoid the underpayment penalty by paying 90% of this year’s tax or 100% of last year’s, even if your final bill ends up higher.
Who Actually Owes These Payments
The rule is easy to state and easy to miss in practice. If you expect to owe $1,000 or more in tax after subtracting withholding and credits, the IRS expects payments spread across the year, not one check in April.
That covers freelancers, single member LLC owners, S corporation shareholders taking distributions beyond their salary, landlords, and anyone with 1099 income and no employer withholding backing it up. We’ve seen clients assume this only applies once their business “feels official.”
It doesn’t work that way. One good freelance year is enough to trigger the requirement.
The 2026 Payment Schedule
The IRS calls these quarterly payments, but the periods themselves are not three equal months. Q2 covers only two months of income and comes due just two months after Q1, which catches a lot of first year filers off guard.
| Payment | Due Date | Covers Income From |
|---|---|---|
| Q1 | April 15, 2026 | January 1 – March 31 |
| Q2 | June 15, 2026 | April 1 – May 31 |
| Q3 | September 15, 2026 | June 1 – August 31 |
| Q4 | January 15, 2027 | September 1 – December 31 |
If a due date lands on a weekend or federal holiday, it pushes to the next business day. That’s the only flexibility built into the calendar.
How Much to Actually Send
This is where most of the guesswork lives, and it doesn’t need to. The IRS gives you a target called the safe harbor, and hitting it protects you from a penalty even if your actual tax bill for the year turns out higher than expected. Pay at least 90% of what you’ll owe for 2026, or 100% of what you owed for 2025.
If your 2025 adjusted gross income was above $150,000, that prior year target rises to 110%. Most of our clients with a fairly predictable income year find the prior year safe harbor easier to hit than trying to forecast the current year mid-stream.
What a Missed Payment Actually Costs
The IRS raised its underpayment interest rate to 7% for the third quarter of 2026, up from 6% in the second quarter, and it compounds daily on any shortfall. That interest starts accruing from the original due date and keeps compounding until the balance clears, not a flat one-time penalty.
A $5,000 shortfall left unpaid for a full year runs roughly $360 in interest alone at that rate. Pay even part of a missed quarter and the calculation adjusts down from that point forward, so a late partial payment still helps.
A System That Actually Holds Up
Forecasting your exact tax bill every quarter is harder than it sounds, and most self-employed people don’t need to try. Set aside a percentage of every payment the moment it lands, before it mixes into your operating cash.
For federal income tax plus self-employment tax, 25 to 30% is a reasonable starting range depending on your bracket and deductions, and a separate savings account keeps the money from quietly disappearing into payroll or inventory. Review that percentage once or twice a year, not just at tax time.
Income from freelance work rarely arrives in even amounts, and a system built for a steady paycheck won’t hold up against a business that doesn’t pay you the same way twice.
Conclusion
Quarterly estimated taxes aren’t complicated once you know the dates and the target percentage, but skipping one is an expensive way to find that out.
If you want us to run the actual numbers for your situation, reach out and we’ll set up a payment schedule that fits how your income actually shows up.
