Interactive Federal Return Waterfall & Bracket-Room Solver · Lines 1a–38

Form 1040 X-Ray & Year-End Tax-Cliff Simulator

Trace every dollar of W-2 wages, dividends, IRA/Roth conversions, Social Security, and Capital Gains through the actual Form 1040 lines — while seeing your exact remaining room in every ordinary bracket, the 0% LTCG Tax-Gain Harvesting ceiling, the 2026 ACA 400% FPL Subsidy Cliff, and the OBBBA Schedule 1-A Senior Deduction.

Tax Year
Calculating...
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1Form 1040 Inputs
Edit any line below or click a Case Study above.
1

Remaining Ordinary Bracket Room, 0% LTCG Ceiling & ACA / IRMAA Cliffs

Marginal Ordinary Bracket Bracket Ceiling (Taxable Income) Remaining Room Inside Bracket Total Room to Top of Bracket
2

Form 1040 (Year 2026) — Complete Line-by-Line Waterfall

Lines 1a – 38
Line Form 1040 Description & Supporting Schedule Amount
3

Your Year-End Form 1040 Action Playbook