Key facts at a glance
No-state-tax contractor
$43,400 owed/yr
29% of every invoice
Same income, California
$52,505 owed/yr
35% of every invoice
4 payments a year
Apr 15 · Jun 15 · Sep 15 · Jan 15
Form 1040-ES, uneven periods
On $150,040 of 1099 contract revenue with no state income tax, you owe $43,400 in tax for the year, federal income tax and the full 15.3% self-employment tax, with zero withholding along the way. That's $10,850 due four separate times: April 15, June 15, September 15, and January 15.
The number that actually matters day to day isn't the annual total, it's what to hold back from each invoice as it lands, so those four dates never catch you short. Set aside roughly 29% of every payment (higher with state tax added on top) and the quarterly deadline becomes a transfer, not a scramble.
Get your own quarterly numbers, not the example above.
Open the US Day Rate CalculatorWhy 1099 income needs its own tax schedule
A W-2 paycheck has federal tax, Social Security, and Medicare withheld automatically, every single payday, by an employer legally required to do it. Nobody withholds anything from a 1099 payment. The full responsibility, and the full 15.3% self-employment tax on top of ordinary federal income tax, sits with the contractor.
The IRS doesn't wait until next April to collect that, it requires quarterly estimated payments through the year via Form 1040-ES, on four dates that don't line up with calendar quarters: January through March (due mid-April), April and May only (due mid-June), June through August (due mid-September), and September through December (due the following mid-January). Miss the target by enough and the IRS charges an underpayment penalty, interest on the shortfall, even if the full balance gets paid by the regular filing deadline.
The safe, simple approach most contractors use: pay 25% of your estimated annual tax at each of the four dates, which satisfies the IRS's "pay at least 90% of the current year's liability" safe harbor. That's exactly what the schedule below models.
Worked schedule: $150,040 in 1099 revenue, no state tax
$682/day x 220 billable days, no business expenses, single filer, no state income tax (Texas, Florida, Washington, etc.).
| Payment | Period covered | Due date | Amount |
|---|---|---|---|
| Q1 | Jan 1 - Mar 31 | April 15, 2026 | $10,850 |
| Q2 | Apr 1 - May 31 | June 15, 2026 | $10,850 |
| Q3 | Jun 1 - Aug 31 | September 15, 2026 | $10,850 |
| Q4 | Sep 1 - Dec 31 | January 15, 2027 | $10,850 |
| Total for the year | $43,400 | ||
Adding California state tax to the same $150,040 revenue raises the total to $52,505, or $13,126 per quarter. Figures computed directly from this site's US Day Rate Calculator engine (2026 rates).
Set the percentage aside the day each invoice clears
At 29% (no state tax) to 35% (California), the right number to move is closer to a third of every payment than a quarter of it. Moving it immediately, into an account you treat as already spent, is what turns four large, dreaded due dates into four routine transfers.
Income that varies significantly month to month makes a flat percentage less reliable, if a slow quarter is followed by a large one, revisit the running total rather than assuming the year averages out evenly.
What this schedule does and doesn't model
This uses the simple, even 25%-per-quarter safe harbor (paying at least 90% of the current year's estimated liability), the approach most contractors with reasonably steady income actually use. It doesn't model the alternative prior-year safe harbor (100%/110% of last year's tax), the Qualified Business Income deduction, S-corp elections, or retirement account contributions, all of which a tax professional can factor into a more precise number for your specific situation.
Build your own quarterly schedule
Enter your rate, billable days, and state, select 1099 Sole Proprietor, and the quarterly schedule appears automatically.
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Frequently asked questions
How much should a 1099 contractor set aside for taxes?
It depends on income, deductions, and state, but for a mid-career contractor with no state tax and no business expenses, roughly 29% of every invoice is a reasonable rule of thumb. On $150,040 of annual 1099 revenue, that works out to $43,400 owed for the year, federal income tax plus the full 15.3% self-employment tax. Add a state like California and the set-aside climbs to roughly 35%. Always calculate your own number, income level and deductions both move this meaningfully.
When are 1099 quarterly estimated tax payments due in 2026?
Four dates: April 15, 2026 (income from January to March), June 15, 2026 (April and May, an unusually short two-month period), September 15, 2026 (June through August), and January 15, 2027 (September through December, for the prior tax year). Despite the name, these are not even three-month quarters, the periods are genuinely uneven.
What happens if I miss a quarterly payment or pay too little?
The IRS charges an underpayment penalty, calculated as interest on the shortfall from the due date until it's paid, even if you pay the full amount owed by the following April 15 filing deadline. The penalty is usually modest at typical contractor income levels, but it's simple to avoid entirely by making the four payments on time and roughly at the right size.
Do I have to pay exactly 25% every quarter, or can the amounts vary?
The IRS allows uneven payments as long as the total paid by each due date meets that period's safe harbor requirement, which matters if your income is genuinely lumpy quarter to quarter. For most contractors with reasonably steady income, though, the simplest and safest approach is the even 25% split this article uses, it avoids having to recalculate your safe harbor position every quarter.
Is there a way to avoid the underpayment penalty even if I miscalculate?
Yes, two official safe harbors exist. Paying at least 90% of the current year's actual tax liability across the four payments avoids the penalty, which is what this article's even-split schedule targets. Alternatively, paying at least 100% of last year's total tax liability (110% if last year's adjusted gross income was above $150,000), spread across the four payments, also satisfies the safe harbor, and has the advantage of being a known, fixed number from a return you've already filed, rather than an estimate of income you haven't finished earning yet.
Does a W-2 agency contractor need to make these payments too?
No. A contractor placed through a staffing agency and paid as a W-2 employee has tax withheld from every paycheck automatically, exactly like any other job, so there's no quarterly estimated tax obligation at all. This entire schedule applies specifically to the 1099 sole-proprietor structure, where no one withholds anything on your behalf.
Should I put the set-aside money in a separate account?
Most contractors who stay disciplined about this do, a dedicated savings account that only exists for tax money, funded automatically the day each invoice clears. Treating that percentage as never-actually-yours from the moment it lands, rather than something you'll transfer over before each deadline, is the difference between this being routine and being a quarterly scramble.
Are these figures exact, or an estimate?
They're computed directly from this site's US 1099 contractor engine (2026 federal brackets, 15.3% self-employment tax on 92.35% of net business income, and each state's own 2026 tax rules), the same engine behind the day-rate calculator. The schedule itself assumes the simple even-25%-per-quarter safe harbor described above; if your income varies significantly by quarter, or you'd rather target the prior-year safe harbor instead, a tax professional can size the exact payments to your situation.