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Quarterly Tax Calculator

Enter your expected business profit and filing status. Get an estimated federal tax bill, a savings percentage, and a quarterly payment.

Your details

Use profit after deductible business expenses, before owner draws and personal taxes.

Filing status

Number of dependents

Qualifying children under 17

Other qualifying dependents

Total dependents: 0

Count only dependents eligible for the child or other-dependent credit. Do not count yourself or your spouse.

Projected annual business profit ($)

Employment income

Enter expected full-year amounts. Leave these at $0 if they do not apply.

Your expected annual W-2 wages ($)

Expected annual federal income tax withholding ($)

Blank = salary-only estimate using the selected filing status, combined W-2 wages and standard deduction, with no W-4 dependent adjustments or extra withholding. This is an assumption, not your actual payroll withholding. Enter the expected full-year amount from paystubs for accuracy; enter 0 if none will be withheld. Exclude Social Security, Medicare and state withholding.

If you have business income only, leave W-2 wages at $0.

Federal estimate only · 2026 · State/local taxes excluded

Planning assumptions: standard deduction, eligible QBI, under age 65, qualifying child/other-dependent credits. No other deductions or credits. Special filing-status rules and other income may require a separate calculation.

Do you need federal estimated payments?

Federal payment

Each quarter toward the full projected bill

Recommended savings

Of business profit, after included withholding

Estimated annual federal tax

Federal only. State/local taxes are not included. Quarterly amount assumes four installments; use the planner below for payments already made or a later start.

Your full tax breakdown

Assumptions, scope & IRS sources

2026 estimate uses 92.35% of profit for self-employment net earnings (under $400 exempt), 12.4% Social Security subject to the $184,500 wage base less your own W-2 wages, 2.9% Medicare, Additional Medicare tax above the filing-status threshold, half-SE-tax deduction, filing-status standard deduction and tax brackets, and the lesser of 20% of adjusted QBI or 20% of taxable income before QBI. Includes nonrefundable child tax credit ($2,200 per qualifying child under 17) and other-dependent credit ($500), with income phaseouts. Refundable credits such as EITC and Additional Child Tax Credit are not modeled; lower-income results may overstate tax. Withholding is estimated from salary alone if left blank and is explicitly labeled. An entered zero is preserved. Both spouses’ business profits have separate Social Security wage caps. No losses, carryforwards, investment income, itemizing, retirement or health insurance deductions, or AMT. Above the standard QBI taxable-income threshold, no QBI deduction is modeled and results require further review. Head-of-household and surviving-spouse eligibility are assumed. MFS uses a $75,000 prior-AGI threshold for 110% protection.

Regular planning schedule uses cumulative annual targets of 25%, 50%, 75%, and 100% after expected withholding. Catch-up is the target for passed deadlines after allocated withholding minus total estimates paid, floored at zero. The next installment is the next cumulative target minus payments and the displayed catch-up. For a later business start, this prototype assumes income first subject to estimates in the start month, skips earlier deadlines, and uses the cumulative target at the first eligible deadline. Annual withholding is allocated evenly across all four installments. The full-bill annual payment target subtracts withholding; the penalty-protection target subtracts withholding after comparing the current/prior-year tax targets. Actual amended estimates should be checked using Publication 505 Worksheet 2-12. The first month subject to estimates is a separate input from the projection helper’s business start month.

The separate penalty-protection target uses the lesser of 90% of projected current tax and 100% of eligible prior tax (110% if prior AGI exceeded $150,000). Zero-prior-tax exception requires the indicated full-year/residency conditions. Unknown prior tax uses the current-year route. This is not Form 2210 or the annualized-income method. Paid totals cannot establish whether past payments were timely. No penalties or disaster postponements calculated.

All calculations happen in your browser. Entries are not uploaded or retained.

IRS Publication 505 · 2026 Form 1040-ES

Already paid estimates—or missed a payment?

Add your payments and savings to see a catch-up plan and the next installment.

Update your payment details

Planning dateFirst month with business income subject to estimates

Usually January for an existing business. This determines the first eligible payment deadline.

2026 federal estimated payments made so far ($)

Include any prior-year overpayment applied to 2026. Do not include state payments.

Cash currently reserved for federal taxes ($)

Current cash balance after any tax payments already made.

Optional: Check prior-year payment protection

Without prior-year details, the comparison uses 90% of projected current-year tax.

Prior-year federal tax situationPrior tax year covered 12 months; U.S. citizen or resident throughout that year.

2026 federal planning prototype. Standard deduction, eligible QBI, under age 65, qualifying child/other-dependent credits; no other deductions or credits. MFS assumes spouse does not itemize, no community-property adjustments, and no other income or withholding on this return.

Your catch-up and next-payment plan

Full-bill payment target through past deadlines

Federal payments already made

Suggested catch-up payment now

Catch-up toward penalty-protection target

Next deadline

Next installment, after suggested catch-up

Future installment assumes you make the catch-up payment shown above. Existing overpayments reduce future amounts.

These are planning targets based on today's forecast—not an exact determination of past required installments or penalties. A catch-up payment does not erase a late-payment penalty. Changing or uneven income can change the amounts due; payment dates and period-by-period income are needed for that review.

Is your tax savings on track?

Full-bill funding target through past deadlines

Federal estimates paid + cash reserved

Additional amount to set aside

Cash shortfall for catch-up payment alone

Annual tax still to fund after withholding, payments and savings

Funding targets overlap: do not add the shortfalls together. Cash saved is still yours; it does not count as a payment to the IRS.

2026 payment timeline

Full-bill planning schedule. Payments allocated to earliest installments first. No payment-date or penalty analysis.

Deadline	Target	Unfunded payment	Timing

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