What's inside
- Expenses: up to 30 kinds of cost (cost each time × times per year), marked Certain, Likely or Maybe, with totals by category
- Plan: your election (what it covers, up to the 2026 limit of $3,400), per paycheck, tax saved, the $680 carryover if your plan has one, and a grid of net benefit (tax saved − money forfeited) for four elections × three outcomes
- Log: up to 300 medical costs with what you've claimed, what's still to claim, and the FSA money left
- Sample: $800 certain, $690 likely, $400 maybe. Electing $1,490 ($57.31 a paycheck) saves $447 in tax; if only the certain costs happen, just $10 is forfeited
Checked, not just designed: all 103 formulas recalculate with zero errors, and every result was checked against an independent claim-by-claim simulation of the year in 7 scenarios.
Works in Excel and Google Sheets. Not tax advice.
Try the free version first
The free online calculator uses the same model for a quick answer. The spreadsheet adds tracking, history and the full views.