Payroll & tax

Quarterly estimated-tax safe harbor (Form 1040-ES): the required annual payment and per-quarter amount to avoid an underpayment penalty.

Quarterly estimated-tax safe harbor (Form 1040-ES): the required annual payment and per-quarter amount to avoid an underpayment penalty.

Payment: x402 ($0.10 USDC on eip155:8453). Call unpaid to receive an HTTP 402 with requirements, then retry with the PAYMENT-SIGNATURE header. Method: required = min(90% of this-year tax, 100% of prior-year tax [110% if prior AGI > $150k, or > $75k if MFS]); quarterly = (required - withholding)/4

post/v1/tax/estimated

Request

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

Request body

expectedTaxThisYearnumber required
priorYearTaxnumber required
priorYearAGInumber required
withholdingThisYearnumber
filingStatus'single' | 'mfj' | 'hoh' | 'mfs'

Response

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

Changes

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