Filing status sets the map
See filing status choose the deduction, ordinary brackets, capital-gain bands, and NIIT threshold.
One choice selects several rule tables
Filing status is structural. It selects several coordinated rule tables rather than changing one isolated number.
The lesson switch is educational, not an eligibility test. Real filing status depends on marital and household facts described by the IRS.
Follow every downstream effect
Compare the deduction first, then open the rate-stack stage. The same income reaches a different amount of taxable income and occupies differently sized bands.
Calculation replay
Predict, change, inspect.
Which parts of the calculation can change when every dollar input stays fixed?
- 01Income
- 02Deduction
- 03Rates
- 04NIIT
- 05Payments
Calculation replay ready.
Scenario
The income stays deliberately identical so only the rule map changes.
Switch the illustrative schedule from single to married jointly.
Read the baseline, make a prediction, then play the change.
- Gross income
- —
- Taxable income
- —
- Regular income tax
- —
- NIIT
- —
- Total tax
- —
- Balance
- —
Related references