Self-employment (SECA) tax API

Estimate self-employment tax using the canonical SECA formula 15.3% x (net earnings x 92.35%) — Social Security 12.4% capped at the 2024 wage base ($168,600) plus Medicare 2.9% uncapped — returning the SS/Medicare split, total SE tax, and the deductible half. Estimate only. Answers 'how much self-employment tax on $100k','what's SECA tax','1099 contractor tax','deductible half of SE tax'.

Price$0.01per request

MethodPOST

Route/v1/calc/tax-self-employment

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

taxself-employmentseca1099freelanceficauscalc

API URLhttps://x402.hexl.dev/v1/calc/tax-self-employment

Integration docs

Example request

{
  "netEarnings": 100000
}

Example response

{
  "year": 2024,
  "netEarnings": 100000,
  "netEarningsSubjectToSE": 92350,
  "socialSecurityTax": 11451.4,
  "medicareTax": 2678.15,
  "selfEmploymentTax": 14129.55,
  "deductibleHalf": 7064.78,
  "effectiveRate": 0.1413,
  "breakdown": [
    {
      "component": "Social Security (12.4%, capped at $168,600)",
      "base": 92350,
      "tax": 11451.4
    },
    {
      "component": "Medicare (2.9%, no cap)",
      "base": 92350,
      "tax": 2678.15
    }
  ],
  "note": "Estimate. SECA tax = 15.3% x (net earnings x 92.35%); half is deductible above the line."
}

Input schema

{
  "type": "object",
  "required": [
    "netEarnings"
  ],
  "properties": {
    "netEarnings": {
      "type": "number",
      "description": "Net self-employment profit in USD",
      "examples": [
        100000
      ]
    },
    "year": {
      "type": "number",
      "examples": [
        2024
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}