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Test the Tax Engine in Real Time
Adjust wages, dependents, and filing statuses below. Watch our pure mathematical rules compute Form 1040 line-by-line with zero server persistence.
Quick Presets:
Taxpayer Parameters (TY2026)ACTIVE INPUTS
W-2 Box 1 (Gross Wages):$125,000
$20,000$180,000$350,000
W-2 Box 2 (Federal Tax Withheld):$19,500
$1,000$30,000$60,000
Qualifying Children (Under 17):0 children ($0 Credit)
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TY2026 Engine v2026.1
Estimated Federal Refund
$703.00
Eligible for direct ACH deposit within 14-21 days of e-file acceptance.
Line 34 (Overpayment)Computed in 0.4ms in RAM
Official Form 1040 Line Calculations:
Line 1a & 1z — Total Wages
Sum of Box 1 from all Form(s) W-2
Line 11 — Adjusted Gross Income (AGI)
Total Income minus Schedule 1 adjustments
Line 12 — Standard Deduction
Statutory rate for SINGLE
Line 15 — Taxable Income
AGI ($agi) - Standard Deduction ($std)
Line 16 — Regular Bracket Tax
Calculated via TY2026 progressive brackets
Line 24 — Total Tax Liability
Line 16 minus nonrefundable credits
Line 25d & 33 — Total Payments
Federal income tax withheld from Form W-2
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