{"uid":"cap_UO6lDC-GRe4cafICZMrcN","slug":"us-payroll-self-employment-fica-tax-estimator-64a19009","name":"US Payroll & Self-Employment FICA Tax Estimator","description":"US payroll tax estimate: Social Security and Medicare on wages, or self-employment tax, including the additional Medicare surtax. Pure computation over your inputs, not tax advice.","url":"https://api.agentstools.dev/tax/fica","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["wages"],"properties":{"wages":{"type":"number","description":"Annual wages or net self-employment earnings (>= 0)"},"tax_year":{"type":"integer","description":"Tax year, default 2026"},"filing_status":{"enum":["single","married_jointly","married_separately","head_of_household"],"type":"string","description":"Filing status, default single"},"self_employed":{"type":"boolean","description":"True computes self-employment tax, default false"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KYQ3m025xxjZdEjeeMxOH","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Computes US FICA taxes (Social Security, Medicare, and additional Medicare surtax) for either employee wages or self-employment income for a given tax year and filing status.","exampleAgentPrompt":"What's my total FICA tax bill for 2026 on $135,000 of self-employment net earnings, filing as single?","exampleUseCases":null,"resultDescription":"A breakdown of Social Security tax, Medicare tax, any additional Medicare surtax (0.9% surtax on wages above the threshold), and total FICA or self-employment tax owed, computed from the inputs provided.","failureModes":["Missing required 'wages' parameter returns a 400 validation error","Negative wages value rejected with validation error","Invalid filing_status enum value returns a 422 error","Unsupported tax year may return an error or fall back to a default","Non-numeric wages value triggers a type validation failure"],"whenToPreferThis":"Use this endpoint when you need a fast, pure-computation FICA/payroll tax estimate for a single set of inputs — either for an employee (Social Security + Medicare withholding) or a self-employed person (full SE tax). Prefer it over a generic tax API when you specifically need FICA breakdown including the additional 0.9% Medicare surtax. Not suitable for income tax, capital gains tax, or full tax return computations.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-15T01:11:29.658Z","isFirstParty":false}