# x402toll Federal Income Tax Calculator 2026

> x402toll Federal Income Tax Calculator 2026 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 2026 US federal income tax liability from gross income, above-the-line adjustments, standard or itemized deductions, filing status, and a flat nonrefundable credit amount

## Facts

- Endpoint: POST https://x402toll.com/v1/tax/federal-income
- 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-federal-income-tax-calculator-2026-3ec9c88f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ssVyfYqeErrFrasB3C13I

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-federal-income-tax-calculator-2026-3ec9c88f -d '<json body>'
```

Example prompt: What will my 2026 federal income tax be if my gross income is $120,000, I have $5,000 in above-the-line adjustments, I'm filing as single, I'll take the standard deduction, and I have $500 in nonrefundable credits?

## When to prefer this

Use this endpoint when you need a pure federal income tax computation for 2026 using the official tax brackets, AGI methodology, and a nonrefundable credit offset — particularly when you need to isolate federal income tax from payroll taxes (FICA) or state taxes. Prefer this over /v1/paycheck when computing annual tax liability rather than per-paycheck net pay.

## Known failure modes

- grossIncome below 0 or above 1,000,000,000 — validation error
- invalid filingStatus value other than 'single' or 'mfj' — enum validation error
- itemizedDeductions provided but deductionType set to 'standard' — may silently ignore itemized amount
- missing required grossIncome field — request rejected
- credits or adjustments as non-numeric types — schema validation error

## How this service works

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).

## Output

Returns the computed 2026 federal income tax: AGI (gross minus adjustments), taxable income after standard or itemized deduction, tax calculated using 2026 brackets, and final tax owed after applying the flat nonrefundable credit amount.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "credits": {
   "type": "number",
   "default": 0
  },
  "adjustments": {
   "type": "number",
   "default": 0
  },
  "grossIncome": {
   "type": "number",
   "maximum": 1000000000,
   "minimum": 0
  },
  "filingStatus": {
   "enum": [
    "single",
    "mfj"
   ],
   "type": "string",
   "default": "single"
  },
  "deductionType": {
   "enum": [
    "standard",
    "itemized"
   ],
   "type": "string",
   "default": "standard"
  },
  "itemizedDeductions": {
   "type": "number",
   "default": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402toll-federal-income-tax-calculator-2026-3ec9c88f/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)