For Business
The calculation engine for payroll products
Every payroll product reinvents the same math. IRS withholding. FICA rates. 50-state tax logic. SalaryLabs gives you a deterministic calculation engine — anchored to official government sources, updated automatically, auditable end-to-end.
Data provenance
Every number traces back to its official source
Federal tax withholding based on IRS Publication 15-T. FICA rates from SSA announcements. BLS OEWS for wage benchmarks. Every formula is deterministic — no AI approximation, no proprietary guessing.
Data provenance chain
Verified data sources
Federal tax brackets
Social Security wage base
Occupational wage estimates
Minimum wage & overtime
Regional price parities
Market interest rates
API response
Every field is machine-readable and traceable
The JSON response includes the result, the data version, and the exact government source for each field. SHA-256 provenance on request.
API Response
"tool": "take-home-pay",
"version": "1.0",
"dataVersion": "2026-Q4" ✓,
"calculatedAt": "2026-10-13T12:00:00Z",
"provenance": {
"ssWageBase": "SSA-2026" ✓,
"fedBrackets": "IRS-RP-2026-32" ✓,
"flsaRate": "DOL-2026" ✓
},
"input": {
"gross": 85000,
"state": "CA",
"filing": "single"
},
"result": {
"netAnnual": 61897,
"effectiveRate": 0.272,
"effectiveRateDisplay": "27.2%",
"monthlyTakeHome": 5158,
"breakdown": [...] // 4 items: federal, fica, state, net
}
}
✓ Every field is traceable to its official source. SHA-256 provenance chain on request.
Breakdown visualization
What changes
Your calculation infrastructure, vs. SalaryLabs
Not a widget. A complete calculation infrastructure: data freshness, provenance, and auditable math — built once, maintained by us.
Cost comparison
Building it in-house is expensive. Here's why.
IRS Publication 15-T alone is 300+ pages. Then state tax logic, SSA FICA caps, BLS data integration, quarterly updates. Engineering teams routinely underestimate this work by 3–6x.
* Estimates based on average US senior developer rate ($130K–$160K/year). Actual costs vary by team size and region. Embed pricing: $299/month for up to 50K calculations/month. Enterprise SLA available.
Time to value
* Estimates based on typical engineering team experience. Your mileage will vary.
Who uses SalaryLabs
Built for teams that can't afford calculation errors
From job boards to payroll SaaS — every product that touches salary needs an accurate calculation engine.
Stop rebuilding IRS/FICA math from scratch. Embed our calculation engine and get IRS-verified accuracy, auditable lineage, and automatic updates when tax law changes.
Calculation engineShow take-home pay on every job listing. Research shows transparency on net pay increases apply rates by 15–30%.
Apply rate boostGive users the real number — not gross salary. Net pay precision drives financial planning engagement and reduces churn.
Engagement401(k), HSA, FSA impact on take-home. Show employees the true value of their benefits package.
Benefits transparencyCompensation band analyzers, FLSA classification, redundancy calculators. Build your custom calculator in hours using our API.
Custom buildersLending, budgeting, and tax prep tools need accurate income-to-tax-to-net breakdown. One API call.
Income APIInfrastructure
Enterprise-grade infrastructure, developer-friendly API
Try it. Free.
Free tier: 1,000 calculations/month. No credit card. Pro: unlimited calculations.
1,000 API calls/month free. All 16 tools. Read the OpenAPI spec, explore the sandbox, or jump straight into the docs.