Quarterly Estimated Tax Calculator [Freelance & 1099 Tax]

Federal estimated taxes · Tax year 2026

Quarterly Estimated Tax Calculator

Estimate federal income and self-employment taxes, compare full-payment and safe-harbor approaches, and view the 2026 IRS quarterly payment dates.

1. Expected 2026 income

Enter full-year projections, not one quarter’s figures. This tool is designed primarily for individual Schedule C freelancers and sole proprietors.

2026 filing status Determines federal brackets and standard deduction.

Annual self-employment receipts ($) Expected gross receipts from freelance or business work.

Deductible annual business expenses ($) Estimated Schedule C expenses, not personal costs.

Annual W-2 taxable wages ($) For a joint return, include both spouses’ ordinary taxable wages.

Other annual ordinary taxable income ($) For example, taxable interest. Prefer professional software for capital gains.

Your own W-2 Social Security wages ($) For the person with self-employment income; don’t include a spouse’s wages here.

Household W-2 Medicare wages ($) For Additional Medicare Tax calculation; include both spouses on a joint return.

If you have W-2 income, enter Social Security and Medicare wages separately as shown on your Form W-2 (boxes 3 and 5). This calculator models one self-employed person’s Social Security wage cap. Two self-employed spouses need separate Schedule SE calculations.

2. Deductions, credits, and payments

The standard deduction and 2026 federal tax brackets are built in. The calculator automatically deducts half of regular self-employment tax.

Deduction method Choose one; do not add standard and itemized deductions together.

Other above-the-line adjustments ($) Exclude the half-SE-tax deduction already calculated.

Other taxable-income deductions ($) Optional: your separately computed eligible QBI or other deduction. Not calculated automatically.

Estimated federal tax credits ($) Enter expected income-tax credits; avoid double counting refundable credits.

2026 federal income-tax withholding ($) Full-year withholding, including any Additional Medicare withholding.

2026 estimated tax payments already made ($) Actual federal estimated payments already sent to the IRS.

Optional state/local reserve (% of profit) Budgeting reserve only; not a state-tax liability calculation.

3. Optional 2025 safe-harbor comparison

If your 2025 tax return covered a full 12 months and otherwise qualifies, prior-year tax may offer a simpler payment target. Otherwise leave both boxes empty.

2025 total tax, not balance due ($) Use prior-year total tax under Form 1040-ES rules, not just what you paid with your return.

2025 adjusted gross income, AGI ($) Determines whether the prior-year percentage is 100% or 110%.

This is a simplified equal-installment estimate for calendar-year taxpayers. It does not calculate Form 2210 penalties, annualized-income installments, tax owed on capital gains at preferential rates, or all 2026 tax-law deductions and credits.

Your 2026 federal tax projection

Estimated full federal tax — Income tax + SE tax + Additional Medicare Tax

Full-funding quarterly amount — After projected annual withholding, before prior estimates paid

Safe-harbor quarterly amount — Using available safe-harbor assumptions

Balance to fund after payments — Tax less withholding and estimates already paid

Where your federal tax estimate comes from

Business net profit—

Net earnings for SE tax—

Regular Social Security portion—

Regular Medicare portion—

Half-SE-tax income deduction—

Deduction used (standard or itemized)—

Estimated federal taxable income—

Estimated income tax after credits—

Additional Medicare Tax—

Funding and safe-harbor check

Estimated full-year federal withholding—

Federal estimates already paid—

90% of current-year tax—

Eligible 2025 tax target (if supplied)—

Annual minimum-payment target modeled—

Additional estimates needed after payments already made—

Suggested federal monthly reserve—

Separate annual state/local reserve—

2026 IRS estimated payment calendar

Illustrative equal quarterly installments for a stable full-year estimate. Due dates are official; dollar amounts are projections and can change when your income changes.

2026 federal estimated tax due dates and payment approaches
Payment period	Due date	Full-funding installment	Safe-harbor installment	Date status

How the 2026 estimated-tax formula works

Net business profit = annual self-employment receipts − deductible business expenses. For typical Schedule C earnings, SE-tax earnings = positive profit × 92.35%. The calculator applies 12.4% Social Security up to the 2026 combined wage base of $184,500 (less your Social Security wages) and 2.9% regular Medicare to SE-tax earnings. It deducts half of regular SE tax when computing federal adjusted gross income.

Federal income tax uses 2026 ordinary-income tax brackets for your filing status, after the selected standard or itemized deduction and your separately entered additional deductions and tax credits. Higher incomes may also incur 0.9% Additional Medicare Tax. Your estimated annual federal tax is the sum of projected income tax, regular self-employment tax, and Additional Medicare Tax.

Full-funding quarterly estimate = max(0, projected tax − annual withholding) ÷ 4. Safe-harbor quarterly estimate = max(0, lesser of 90% of projected current-year tax or eligible 100%/110% of prior-year tax − annual withholding) ÷ 4. Equal installments can be inappropriate for uneven income or payments already missed.

Important limitations: This is not Form 1040-ES, an IRS tax return, or a penalty calculator. It does not automatically compute QBI deductions, preferential capital-gain tax, net investment income tax, alternative minimum tax, itemized deduction limits, dependent credits, special senior/tips/overtime/car-loan deductions, or state taxes. Self-employment loss limitations and joint-return spouse SE calculations may require professional review.

Worked example: a freelancer with $10,000 annual profit

Assume a single filer has $20,000 in annual freelance receipts and $10,000 in deductible business expenses, leaving $10,000 net Schedule C profit. With no wages or other income, regular self-employment tax is approximately $1,412.96: $10,000 × 92.35% × (12.4% Social Security + 2.9% Medicare).

After the deduction for half of that regular self-employment tax, estimated income is below the 2026 single-filer standard deduction of $16,100, producing $0 of regular federal income tax in this simplified example. With no withholding, credits or earlier estimated payments, full annual funding would be around $353.24 per quarter. A simplified 90%-of-current-year safe-harbor target would be about $317.91 per quarter, but this does not determine whether individual installments are timely or prevent every penalty.

Actual liability may differ with eligibility for deductions, credits, other income, household status, tax adjustments and varying income. Review IRS Publication 505 and the IRS estimated-tax guidance before relying on a payment amount.

Frequently asked questions

When are 2026 quarterly estimated federal taxes due?

The regular dates are April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027. Some exceptions apply, including rules for January payments if you file early, as well as weekend and holiday adjustments.

Is the minimum safe-harbor amount the same as my eventual tax bill?

No. A safe-harbor payment may reduce underpayment-penalty exposure while leaving a balance due when you file. The full-funding amount aims to cover the calculator’s estimated annual liability instead.

Do I need to make payments if I owe less than $1,000?

Generally, estimated tax payments are not required if you expect to owe less than $1,000 after withholding and refundable credits. Exceptions and special rules exist; consult IRS guidance for your situation.

What if my freelance income is irregular?

The equal-installment estimate may not apply. The IRS annualized-income installment method, usually calculated with Form 2210 Schedule AI, may better reflect uneven earnings and avoid certain penalties.

Does this include the qualified business income (QBI) deduction?

Not automatically. Eligibility and limitations vary. If you have computed an allowable QBI deduction separately, enter it in the optional extra taxable-income deductions field. Do not simply assume 20% of all income qualifies.

Is my calculation saved or sent to a tax service?

All calculations take place in your browser. This block does not send the entered numbers to a dedicated tax-calculation server. General website analytics and consent tools, if present, operate separately.

Official references: 2026 IRS Form 1040-ES, IRS Publication 505, IRS 2026 bracket and deduction update, and SSA 2026 wage base. Educational estimates only; not tax or legal advice. Reverify every tax-year value before using this for a different year.