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Estimated Tax / Safe-Harbor Calculator

Estimate 2026 federal tax and your safe-harbor target from information you actually know.

1. Start with your 2025 return

These two numbers are copied directly from your 2025 Form 1040/1040-SR.

2025 Total Tax ($) Find it on 2025 Form 1040, Line 24. 2025 AGI ($) Find it on 2025 Form 1040, Line 11b.

2. Estimate your 2026 income

2026 filing status W-2 wages ($) Self-employment / business net profit ($) Interest + other ordinary income ($) Long-term capital gains + qualified dividends ($)

3. Payments already covered

Expected 2026 federal withholding ($) Estimated tax already paid ($)

2026 federal estimate

Estimated 2026 total federal tax$0

Estimated income tax$0

Estimated self-employment tax$0

90% of estimated 2026 tax$0

Safe-harbor annual target$0

Expected withholding + payments$0

Additional amount toward annual target$0

Equal-installment benchmark

Apr 15, 2026$0

Jun 15, 2026$0

Sep 15, 2026$0

Jan 15, 2027$0

Planning estimate only. The current-year tax estimate uses 2026 standard deductions and federal rate schedules, preferential long-term capital-gain rates, and a simplified self-employment tax calculation. It does not model every credit, deduction, NIIT, AMT, Additional Medicare Tax, QBI, Social Security benefits, special income type, or Form 2210 timing rule.

Estimate only. Results are for educational planning and are not tax, legal, or financial advice. Actual tax treatment depends on your full facts and current law.

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