Tax Estimator Tool

Income Tax Estimator &
Quarterly Payment Calculator

Estimate your federal and state income tax, self-employment tax, and get your exact quarterly estimated payment schedule — with due dates, safe harbor amounts, and state-specific rules for all 50 states.

Free to use.  Upgrade to PDF report — $29 one-time.
1
Filing Information
2
Income Sources
Earned Income
Total wages from all employers
From Box 2 of your W-2 (enter 0 if none withheld)
From Box 17 of your W-2 or pay stubs year-to-date
Total gross receipts before any business expenses
Home office, supplies, mileage, software, etc. Net = Gross − Expenses
Ordinary income from pass-through entities
Investment & Passive Income
Taxed at lower capital gains rates
Taxed as ordinary income
Taxed at 0%, 15%, or 20%
After depreciation & expenses
Alimony received, prizes, misc.
Above-the-Line Deductions (reduce AGI)
Max $2,500 deductible
3
Deductions & Credits
Mortgage interest, state & local taxes (SALT), charitable contributions, medical expenses. Leave 0 to automatically use the standard deduction.
Child Tax Credit: $2,200/child (2025-2026), phases out at $200k/$400k MFJ
Credit for Other Dependents: $500/dependent, same phase-out thresholds
From last year's Form 1040 line 24 — used to calculate safe harbor
From last year's state return — used for state safe harbor calculation
Education, EV, energy, foreign tax credits
Total Tax Owed
Federal Tax
State Tax
Balance Due / Refund
Federal Tax Breakdown
State Tax Breakdown
Safe Harbor Amounts (avoid underpayment penalty)
Federal Safe Harbor
State Safe Harbor
Federal Per Quarter
Equal installments recommended
State Per Quarter
Federal Estimated Tax Payments (Form 1040-ES)
Quarter Period Covers Due Date Safe Harbor Estimated Tax
State Estimated Tax Payments
Quarter Period Covers Due Date Safe Harbor Estimated Tax
Professional Report — $29
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Complete federal & state tax breakdown with bracket analysis
Full quarterly payment schedule with all due dates
Safe harbor calculations with IRS rule citations
Personalized planning notes from Jessica, CPA
$29
one-time
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Disclaimer: This tool provides estimates for planning purposes only. Actual tax liability depends on factors not captured here including AMT, NIIT, phase-outs, carryforwards, and other credits. State calculations use simplified rates. This is not tax advice. Consult a licensed CPA for your specific situation. — Jessica Le, MBA, MST, CPA · KNL & Company, CPA · knl-cpa.com