1099 Quarterly Tax Set-Aside Calculator

Why the "set aside 30%" rule is usually wrong

Every article on 1099 taxes lands on the same advice: put aside 25 to 30 percent of what you get paid. It is a reasonable guess for someone who has no other information, and it is wrong in both directions for most people who use it.

Take a part-time freelancer clearing $28,000 in profit, single, in a state with no income tax. Her self-employment tax is about $3,956 and her federal income tax, after the standard deduction and the 20 percent qualified business income deduction, is about $794. Total: roughly $4,750, or about 17 percent of her receipts. The 30 percent rule tells her to lock up an extra $3,650 she was never going to owe.

Now take a consultant billing $165,000 in California. Self-employment tax runs about $23,314, federal income tax about $18,949, and the state takes roughly $14,261 of adjusted gross income at 9.3 percent. That is around $56,500, or about 34 percent, and closer to 38 percent if he does not qualify for the QBI deduction. The 30 percent rule leaves him thousands short in April.

Four things move the number, and none of them are in the rule of thumb:

• Profit after expenses. Self-employment tax is charged on profit, not on gross receipts, so a business with real costs pays on a smaller base.
• Filing status. A married joint filer gets double the standard deduction and wider brackets than a single filer on the same profit.
• W-2 wages. A day job fills the Social Security wage base first, which can cut the 15.3 percent charge on your 1099 income down to 2.9 percent.
• State rate. Nine states take nothing from wage income. Others take more than nine points off the top.

Run your own numbers above and you will at least know which direction you have been guessing in.

How the math actually works, line by line

The results panel walks the same ladder the IRS forms do. Follow it on a contractor with $60,000 in receipts and $6,000 of deductible expenses, filing single for 2026:

• Gross receipts minus expenses gives $54,000 of net business profit.
• Times 92.35 percent gives $49,869 of net earnings from self-employment. That factor exists because a W-2 employee's employer-paid half of FICA is not part of their taxable wages either, so Schedule SE removes the equivalent slice before charging you.
• 12.4 percent for Social Security up to the $184,500 wage base is $6,184, and 2.9 percent for Medicare with no cap is $1,446. Self-employment tax: $7,630.
• Half of that, $3,815, comes off above the line, so adjusted gross income is $50,185. The 0.9 percent Additional Medicare surtax, when it applies, is not part of the deductible half.
• Minus the $16,100 standard deduction and minus $6,817 of QBI deduction leaves $27,268 of taxable income.
• Through the brackets (10 percent, then 12 percent) gives $3,024 of federal income tax. Add state tax if you owe any.

Total: $10,654, which is 17.8 percent of the $60,000 that landed in the bank. The 2026 figures come from IRS Rev. Proc. 2025-32 for the brackets and standard deduction, and from the SSA 2026 cost-of-living announcement for the $184,500 wage base. The employee-side view of the same Social Security and Medicare taxes lives in the FICA tax calculator, and if you are quoting a rate that has to net a target after tax, the gross-up calculator works that direction.

Quarterly due dates, safe harbors, and missing one

For the 2026 tax year, estimated payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. The periods behind those dates are not equal calendar quarters: Q1 covers January through March, Q2 covers only April and May, Q3 covers June through August, and Q4 covers September through December. If a date falls on a weekend or a federal holiday it moves to the next business day, which is why the 2025 Q2 deadline was June 16. You can skip the January payment entirely if you file the return and pay in full by February 1, 2027.

You only have to pay at all if you expect to owe $1,000 or more when you file, counting withholding and credits. Below that, the IRS does not ask for estimated payments.

Above it, a safe harbor keeps you clear of the underpayment penalty. Pay 90 percent of this year's total tax, or 100 percent of last year's total tax, whichever is smaller. If last year's AGI was over $150,000 ($75,000 filing separately), the prior-year test rises to 110 percent. In practice the prior-year test is the one to use, because last year's number is already printed on line 24 of your Form 1040 and this year's is still a moving target. Hit it and you are protected even if your income doubles.

Miss a quarter and the penalty is interest on the shortfall for the days it was late, not a flat fine, so a late payment costs less than no payment. If you also hold a W-2 job, there is a shortcut worth knowing: withholding counts as paid evenly across the year no matter when it actually came out. Filing a new Form W-4 to withhold more from your paycheck can cover a 1099 shortfall retroactively in a way a December estimated payment cannot.

Keeping a paper trail for your 1099 income

Set-aside math is only as good as the income record behind it. Contractors who invoice several clients at irregular intervals tend to reconstruct the year from bank notifications in March, which is how receipts go missing and how a lender ends up asking for documentation nobody kept. An itemized record per payment beats a folder of transfer screenshots, and it is the same record you need when a landlord or an underwriter asks you to prove income. The proof of income calculator covers what they usually want to see.

Payslip44 builds a stub per payment: save the payer once as a reusable employer, mark the worker 1099, reuse your line items, and the money math stays exact to the cent, all on-device. Stubs export as PDF, PNG, CSV, or plain text. CSV is the one that matters here, because it drops straight into whatever spreadsheet you use to total the year before running these numbers again.

Document 1099 pay with Payslip44, so the record behind an estimate like this one actually exists.