Developer Platform

UK Tax & Salary Calculation API

Embed accurate 2026-27 UK PAYE, Income Tax, Scottish Tax, National Insurance, Student Loans, and Stamp Duty calculations into your software.

Pricing & Access Tiers

Developer / Free Tier

Live Now

£0 / forever

  • 10 requests per minute per IP
  • Full access to /api/tax and /api/stamp-duty
  • 2026-27 HMRC Tax Year rates
  • No API key required for testing
Start Integration
Commercial

Pro / Permanent Key

Unlimited

£20 / month

  • Unlimited API requests
  • Dedicated rate limits & SLA
  • Direct developer email support
  • Custom webhook / batch calculation options
Get Pro API Key (£20/mo)

Quickstart & API Reference

POSThttps://www.wagecheck.co.uk/api/tax
PAYE & Take-Home Calculation

Request Example (cURL)

curl -X POST https://www.wagecheck.co.uk/api/tax \
  -H "Content-Type: application/json" \
  -d '{
    "grossAnnualSalary": 45000,
    "pensionContributionPercent": 5,
    "studentLoanPlan": "plan2",
    "region": "rest-of-uk"
  }'

Response Example

{
  "success": true,
  "data": {
    "gross": 45000,
    "personalAllowance": 12570,
    "taxableIncome": 30180,
    "incomeTax": 6036,
    "nationalInsurance": 2434,
    "monthlyTakeHome": 2854.17,
    "annualTakeHome": 34250
  },
  "meta": { "taxYear": "2026-27" }
}
POSThttps://www.wagecheck.co.uk/api/stamp-duty
Stamp Duty / SDLT / LBTT Calculation

Request Example (cURL)

curl -X POST https://www.wagecheck.co.uk/api/stamp-duty \
  -H "Content-Type: application/json" \
  -d '{
    "propertyPrice": 350000,
    "location": "england",
    "buyerType": "standard"
  }'

Response Example

{
  "success": true,
  "data": {
    "total": 5000,
    "effectiveRate": 1.43,
    "bands": [...]
  },
  "meta": { "taxYear": "2026-27" }
}

Commercial & Compliance Notice

The Wagecheck API provides calculations based on published HMRC guidelines for the 2026-27 tax year. Calculations are provided for informational and estimation purposes only and do not replace certified payroll or tax advisory systems.