How this calculator works
Tax year: 2024. General standard deductions are $5,540 single or separate and $11,080 joint or head of household. Enter already-limited itemized deductions and credits if applicable. The 1% Mental Health Services Tax above $1 million taxable income is included. Federal income tax, Social Security, Medicare, state disability insurance and unentered credits are excluded. The remaining amount is not full take-home pay. Rate-band estimates can differ from the official small-income tax tables. Property tax, where shown, is separate from the pay-period amount.
Formula
Taxable income = max(0, state AGI - additional eligible adjustments - allowed deductions and exemptions). Apply state bands and applicable supplements, then subtract supplied non-refundable credits. Average period amount = (AGI - listed income taxes - post-tax deductions) / annual pay periods.
Worked example
A single filer with $15,540 state AGI and the $5,540 standard deduction has $10,000 taxable income and $100 tax before credits. A joint filer with $31,080 AGI has $20,000 taxable income and $200 tax before credits.
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Frequently asked questions
Which year does this use?
The fixed state rules on this page are for 2024. Later-year returns require updated thresholds and deductions.
Is the remaining amount my paycheque?
No. Federal tax, payroll contributions and other unentered deductions are not included. It is income after only the listed worksheet items.
Should retirement contributions be entered twice?
No. Enter them only if they are eligible state adjustments not already excluded from the AGI you supplied.