Income & rate assumptions
NOT tax advice / not a filing tool. Confirm quarterly estimates with a licensed tax pro or IRS guidance. Site also has a Q4 estimated-taxes Rising page.
Annual ≈ income×(fed% + SE%); quarterly ≈ annual ÷ remaining quarters (max(1, 4−passed)).
Quarterly rough estimate
Annual tax rough—
Per-quarter rough—
SE-tax portion—