# x402toll Self-Employment Tax Calculator

> x402toll Self-Employment Tax Calculator is a paid API for AI agents from x402toll.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Calculates US self-employment tax on Schedule C net profit, including Social Security (up to 2026 $184,500 wage base), Medicare, Additional Medicare, and the deductible half

## Facts

- Endpoint: POST https://x402toll.com/v1/tax/self-employment
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402toll-self-employment-tax-calculator-2ff67b0a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4-jszqrPsZuCCNRJWBaEE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402toll-self-employment-tax-calculator-2ff67b0a -d '<json body>'
```

Example prompt: What's my self-employment tax on $95,000 net profit filing as single with no W-2 wages this year — break down Social Security, Medicare, Additional Medicare, and how much I can deduct?

## When to prefer this

Use this endpoint when you need a precise, 2026-current self-employment tax breakdown for a Schedule C filer, especially when the user has W-2 wages that offset the Social Security wage base or needs the deductible half for AGI calculation. Prefer over generic tax APIs when SE-specific detail (wage base offset, deductible half) is required.

## Known failure modes

- Missing or invalid netProfit field returns validation error
- Invalid filingStatus enum value rejected
- Negative netProfit may return zero SE tax or error depending on implementation
- Very large netProfit may trigger edge-case rounding differences
- w2SocialSecurityWages exceeding wage base correctly zeroes out SS portion

## How this service works

Self-employment (SE) tax on Schedule C net profit — Social Security to the 2026 $184,500 wage base, Medicare, Additional Medicare, and the deductible half.

## Output

Returns a breakdown of self-employment tax components: Social Security tax (capped at 2026 $184,500 wage base net of any W-2 wages), Medicare tax (2.9% flat), Additional Medicare surtax (0.9% above threshold), total SE tax, and the deductible half of SE tax for Form 1040 above-the-line deduction

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "netProfit": {
   "type": "number"
  },
  "filingStatus": {
   "enum": [
    "single",
    "mfj",
    "hoh",
    "mfs"
   ],
   "type": "string",
   "default": "single"
  },
  "w2SocialSecurityWages": {
   "type": "number",
   "default": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402toll-self-employment-tax-calculator-2ff67b0a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402toll.com](https://www.zero.xyz/host/x402toll.com/llms.txt)