Next federal deadline Sep 15 in 9 days
Business income is seasonal. Your tax payments should be too. Size each payment to the quarter that earned it
Free to check. No card, no SSN.
Q3 2026 estimate
Single-member LLC · seasonal retail
Pay this quarter
$4,112.00
Due Sep 15. Sized to a slow summer.
Safe harbor
¼ of last year's protected amount
$7,100.00
Annualized income Selected
Schedule AI, this year's actual quarters
$4,112.00
The difference stays in the business until the quarter that earns it.
Sample calculation
Run yours free →Built on the IRS's own rules
Built for how business income actually works. It handles the parts the simple calculators skip.
A quarter is not ¼ of your yearly bill
Equal installments assume you earn the same every month. When your year is uneven, the IRS's annualized method sizes each payment to the income received by that deadline.
¼ of the yearly bill
$7,100.00
Q3 on this year's actual income
$4,112.00
Sample, seasonal retail with a slow summer.
Your entity mix, in one estimate
Owner salary, distributions, pass-through income, and rentals interact. The estimate accounts for each stream and for the withholding you already have.
Owner W-2 salary withholding counted
$60,000.00
S-corp pass-through (K-1)
$85,000.00
Rental income passive rules applied
$12,400.00
Sample mix. QBI and SE tax are computed where they apply.
Send it to your accountant
Sharing works on every plan. Your accountant gets the numbers to verify without a quarterly billable call.
From Jordan Meyer via Simple Estimates
Jordan shared their Q3 2026 quarterly tax estimates
Both methods, the recommended payment, and the figures behind them.
The state layer, not forgotten
Most income-tax states want their own quarterly payments. Your state's safe harbor number is included free, next to the federal one.
Federal quarterly payment
$4,112.00
California safe harbor
$1,230.00
Sample. State coverage is the safe harbor number.
Pick the year that looks like yours. Watch the four payments move to the quarters that earned them.
Owners guessing with a spreadsheet get this wrong in both directions. One overpaid by $7,000 and loaned it to the IRS interest-free. Others underpay a big quarter and meet the penalty a year later.
The annualized method is the IRS's own answer for uneven years, and the Form 2210 Schedule AI package it requires is produced for you.
Run it on my numbersPick the year that looks like yours.
Same year of income. The annualized method moves the payments to the quarters that earned them.
Simulated sample numbers, computed with the real 2026 engine.
2
Official IRS methods computed on every calculation
4
Federal deadlines tracked, with a reminder before each
$0
To get your quarterly number. No card required
0
SSNs stored, ever. You type dollar amounts, nothing links to your books
Each year's brackets and thresholds are audited against IRS source documents and pinned by automated tests. Tax logic reviewed by Steven Wu, CPA, formerly of PwC. Meet the team
Asked by owners before signing up.
My spreadsheet works fine. Why switch?
A spreadsheet usually applies one method, and you have no way to check it. One owner in our research overpaid by $7,000 doing exactly that. Here both official IRS methods are computed on the same numbers, side by side, so the answer is checkable instead of hopeful.
If it tells me to pay less than last year, will the IRS accept that?
Yes, when the paperwork backs it up. Uneven payments are justified with Form 2210 and Schedule AI, which is the IRS's own form for exactly this situation. The calculator produces that package from the same calculation that gave you the number.
Does it handle S-corp salary plus distributions?
Yes. Your owner W-2 wages and their withholding count toward what you have paid in, and pass-through business income flows into the personal estimate where it belongs. Rental income and the passive rules are handled too.
Do I re-enter everything every quarter?
No. Your year carries forward from quarter to quarter. You update what changed, the worksheet recomputes, and the next payment reflects the year you are actually having.
Not here for a business? You get the same calculations, set up for how you work.
Individuals
Freelancers, contractors, and anyone with income nobody withholds for. Plain questions, rough numbers, and the payment that keeps you penalty-free.
Simple Estimates for individualsAccountants
Every client's quarterly numbers in one dashboard, computed both official ways, with filled 1040-ES vouchers and PDF reports ready to send.
Simple Estimates for accountantsThe rules behind the payments. Every guide is written in plain language and sourced from the IRS.
The annualized income method.
How the IRS method for uneven income works, period by period, and the Schedule AI paperwork it requires.
Read the guideA windfall quarter, handled.
Sold something big or landed the year's project? How safe harbor and annualization keep a spike penalty-free.
Read the guideState estimated taxes.
Most income-tax states want their own quarterly payments, with different thresholds and schedules.
Read the guidePay tax on the quarter you actually had. Q3 is due Sep 15. The check is free.
Free to check. No card, no SSN, no password. We email you a 6-digit code to sign in.