The Problem
Every payroll product
reinvents the same math.
IRS withholding. FICA rates. 50-state tax logic.
Most teams spend 6–12 months building this from scratch.
And then they have to maintain it forever.
6–12mo
typical build time
$144K
average first-year cost
$1,500
avg. cost per payroll error
∞
hours of ongoing maintenance
* Estimates based on US senior developer rates ($130K–$160K/year). Engineering teams routinely underestimate tax calculation complexity by 3–6x. ADP payroll error cost data is an industry benchmark; individual results vary.
The Solution
One API. All the math.
Zero guesswork.
SalaryLabs provides a calculation engine with full data provenance,
anchored to official IRS, BLS, SSA, and DOL sources.
One API call. 16 tools. Auto-updated every Monday at 05:00 UTC.
Data provenance
IRS→SSA→DOL→BLS→SalaryLabs→Your API
✓
IRS Rev. Proc. 2025-32 — federal withholding brackets
✓
SSA 2026 Wage Base — $176,100 Social Security cap
✓
DOL FLSA 2026 — $684/week salary threshold
✓
50-state tax logic — updated automatically
All metrics sourced from official government publications. SHA-256 provenance chain on request.
The Product
Every calculation
traces back to
its official source.
A live API response from the take-home-pay calculator.
Every field is traceable. Every number has a provenance chain.
salarylabs.site/api/v1/calculate
"tool": "take-home-pay",
"version": "1.0",
"dataVersion": "2026-Q4" ✓,
"provenance": {
"ssWageBase": "SSA-2026" ✓,
"fedBrackets": "IRS-RP-2026-32" ✓,
"flsaRate": "DOL-2026" ✓
},
"result": {
"netAnnual": 61897,
"effectiveRate": 0.272,
"effectiveRateDisplay": "27.2%"
}
}
"version": "1.0",
"dataVersion": "2026-Q4" ✓,
"provenance": {
"ssWageBase": "SSA-2026" ✓,
"fedBrackets": "IRS-RP-2026-32" ✓,
"flsaRate": "DOL-2026" ✓
},
"result": {
"netAnnual": 61897,
"effectiveRate": 0.272,
"effectiveRateDisplay": "27.2%"
}
}
Source chain
IRS RP 2026-32→SSA 2026→BLS OEWS→DOL FLSA→KV namespace
Data refreshed every Monday 05:00 UTC via Cloudflare Workers cron. Every metric stored with SHA-256 provenance hash.
Market Opportunity
Every salary-touching
product needs this.
HR tech. Payroll SaaS. Job boards. Financial planning apps.
Benefits administration. Enterprise HR tools. Fintech platforms.
HR Tech & Payroll SaaS$12B TAM
Job Boards & Recruitment$8B TAM
Financial Planning & Fintech$28B TAM
Benefits Administration$6B TAM
Total Addressable Market
$54B
US B2B salary calculation infrastructure
Market sizing based on BLS, IBISWorld HR tech reports, and Gartner SaaS segmentation.
Let's Build Together
Your calculation engine.
Ready to embed.
Free tier: 1,000 calculations/month, no credit card.
All 16 tools. Real IRS, SSA, BLS, DOL data. Full provenance.
Most Popular
Pro
$299/mo
Unlimited calculations
Priority support
API dashboard
Custom integrations
50+
Gov metrics
16
Tools
1
API
0
Credit card
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