Payroll & tax

Federal income tax on ordinary income for 2026: AGI from gross minus above-the-line adjustments, standard or itemized deduction, the 2026 brackets, and a flat nonrefundable credit amount. Distinct from /v1/paycheck (which nets FICA + state per pay period).

Federal income tax on ordinary income for 2026: AGI from gross minus above-the-line adjustments, standard or itemized deduction, the 2026 brackets, and a flat nonrefundable credit amount. Distinct from /v1/paycheck (which nets FICA + state per pay period).

Payment: x402 ($0.05 USDC on eip155:8453). Call unpaid to receive an HTTP 402 with requirements, then retry with the PAYMENT-SIGNATURE header. Method: AGI = grossIncome - adjustments; taxable = max(AGI - deduction, 0); tax = marginal 2026 brackets (MFJ doubles single thresholds); totalTax = max(tax - credits, 0)

post/v1/tax/federal-income

Request

  • Base URL: (relative, and it does not resolve against the document’s source URL)
  • URL: /v1/tax/federal-income
  • Auth: none declared

Request body

grossIncomenumber required
filingStatus'single' | 'mfj'
adjustmentsnumber
deductionType'standard' | 'itemized'
itemizedDeductionsnumber
creditsnumber

Response

Verified result + provenance (formula, sources, reproducible SHA-256 hash).

Changes

No recorded changes to this operation across all 1 revision of this API.