---
title: "US net-paycheck breakdown for any of 51 jurisdictions: 2026 federal brackets, FICA (SS wage base $184,500, additional Medicare), and state income tax. Golden-vector verified."
method: POST
path: "/v1/paycheck"
tags: ["Payroll & tax"]
---

# US net-paycheck breakdown for any of 51 jurisdictions: 2026 federal brackets, FICA (SS wage base $184,500, additional Medicare), and state income tax. Golden-vector verified.

`POST /v1/paycheck`

## Request

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

US net-paycheck breakdown for any of 51 jurisdictions: 2026 federal brackets, FICA (SS wage base $184,500, additional Medicare), and state income tax. Golden-vector verified.

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: taxable = salary - standardDeduction; federal = marginal 2026 brackets; state = marginal/flat per 51-jurisdiction table (MFJ doubles single thresholds); FICA = 6.2% SS to wage base + 1.45% Medicare + 0.9% additional over threshold; net/check = netAnnual / payPeriods

## Request body

- object
  - `salary` number, required
  - `state` string, required: 2-letter US state/DC code
  - `filingStatus` 'single' | 'mfj'
  - `payFrequency` 'weekly' | 'biweekly' | 'semimonthly' | 'monthly'

## Response `200`

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

## Other responses

- `400`: Invalid input (no charge) — body echoes the JSON Schema.
- `402`: Payment required — PAYMENT-REQUIRED header carries the x402 accepts[] quote.

---

[API](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents.md) · [All operations](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/llms.txt) · [OpenAPI document](https://skmtc.dev/x402toll/apis/tollbooth-verified-calculators-for-ai-agents/revisions/60cb70a3e1a5?raw)