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FastX402 Tax Bracket Calculator
x402
FastX402 Tax Bracket Calculator is a paid API for AI agents from fastx402.tools, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-28).
Calculates US federal income tax brackets, tax owed, marginal rate, and effective rate for a given income, filing status, and tax year
Price / call$0.002
Success—
StatusUnknown
How this service works
216 pay-per-call tools for AI agents, from $0.001 per request in USDC on Base or Solana with x402. No account, no API key.
Output
Returns a JSON object with the tax year, income, filing status, an array of bracket objects (each with rate, income in bracket, and tax paid in that bracket), total tax owed in dollars, marginal tax rate as a percentage, and effective tax rate as a decimal percentage.
Example use cases
Freelancer estimating quarterly taxes
“I'm a freelancer who expects to earn $95,000 in 2025 and I file as single — can you calculate my federal tax brackets, total tax owed, and effective rate so I know what to set aside for quarterly payments?”
Married couple comparing filing strategies
“My spouse and I earned $160,000 combined in 2024 — can you calculate our federal tax owed and effective rate for married filing jointly versus married filing separately so we can see which saves us more?”
New hire planning take-home pay
“I just got a job offer for $72,000 a year in 2025 and I'll be filing as single — can you show me my federal tax bracket breakdown and effective rate so I can figure out my actual take-home pay?”
Technical details
Endpoint
GEThttps://fastx402.tools/tax-bracket-calculate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a detailed federal income tax bracket breakdown for US filers across tax years 2024, 2025, or 2026, supporting all four filing statuses. It requires no API key and charges only $0.002 per call via x402 crypto micropayment, making it ideal for AI agents needing on-demand tax computation without account setup.
Side effects
- Missing required query parameters (income, year, or filing_status) returns an error
- Invalid year outside 2024-2026 range returns an error
- Invalid filing_status string not matching allowed enum values returns an error
- Non-numeric income string may cause a parsing error
- Payment failure via x402 protocol returns 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"year": 2025,
"income": 85000,
"brackets": [
{
"tax": 1192.5,
"rate": 10,
"income_in_bracket": 11925
},
{
"tax": 4386,
"rate": 12,
"income_in_bracket": 36550
},
{
"tax": 8035.5,
"rate": 22,
"income_in_bracket": 36525
}
],
"tax_owed": 13614,
"filing_status": "single",
"marginal_rate": 22,
"effective_rate": 16.02
}
}Tags
x402
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