Svensk Skatte-API — Swedish tax calculations via curl (REST API, free tier)

skatte-api-demo.md

Svensk Skatte-API — Swedish Tax Calculations as a REST API

Calculate ISK tax, VAT (moms), income tax, and employer contributions via a single curl call. Zero setup — use the free demo key to test immediately.

Quickstart (no auth needed)

# See all available calculations with curl examples
curl https://skatteapi.gracestack.se/demo

Free Tier Examples

# ISK tax on 500,000 SEK portfolio → 5,250 SEK
curl -H "X-API-Key: skatt_demo_free_2026" \
  https://skatteapi.gracestack.se/calculate/isk-tax \
  -H "Content-Type: application/json" \
  -d {kapitalunderlag: 500000, statslaneranta: 0.025}

# Add 25% VAT to 1,000 SEK → 1,250 SEK
curl -H "X-API-Key: skatt_demo_free_2026" \
  https://skatteapi.gracestack.se/calculate/moms \
  -H "Content-Type: application/json" \
  -d {belopp: 1000, momssats: 0.25}

# Income tax on 480,000 SEK salary (Stockholm ~32.29%)
curl -H "X-API-Key: skatt_demo_free_2026" \
  https://skatteapi.gracestack.se/calculate/inkomstskatt \
  -H "Content-Type: application/json" \
  -d {arsinkomst: 480000, kommunalskattesats: 0.3229}

# Employer cost for 45,000 SEK/month
curl -H "X-API-Key: skatt_demo_free_2026" \
  https://skatteapi.gracestack.se/calculate/arbetsgivaravgift \
  -H "Content-Type: application/json" \
  -d {lon: 45000, fodelsear: 1990}

API Endpoints

Endpoint	Description
/calculate/isk-tax	ISK tax (schablonskatt)
/calculate/moms	VAT calculation (25%, 12%, 6%)
/calculate/inkomstskatt	Municipal income tax
/calculate/arbetsgivaravgift	Employer social security contributions
/calculate/kapitalvinst	Capital gains tax
/health	Health check
/demo	No-auth showcase with curl examples

Pricing

• Free: 30 req/min, demo key included
• Pro: 300 req/min, 99 SEK/month — Subscribe

Use Cases

• E-commerce: Calculate VAT at checkout
• Payroll: Employer cost estimates
• Fintech: ISK tax projections
• Accounting: Automate tax calculations

Links

• API: https://skatteapi.gracestack.se
• GitHub: https://github.com/cedendahlkim/svensk-skatt-api
• npm: svensk-skatt Python package — https://pypi.org (coming soon)
• GitHub Actions: https://github.com/cedendahlkim/swedish-tax-action

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Built by Gracestack — Swedish developer tools for Swedish businesses.