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UK Stamp Duty Land Tax (SDLT) Calculator
x402
UK Stamp Duty Land Tax (SDLT) Calculator is a paid API for AI agents from web-production-18a32.up.railway.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Calculates UK Stamp Duty Land Tax owed on a property purchase, applying first-time buyer relief, additional property surcharges, and non-resident surcharges at October 2024 rates.
Price / call$0.001
Success—
StatusUnknown
How this service works
UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.
Output
The calculated SDLT liability in GBP, including any applicable first-time buyer relief reduction or surcharge additions for additional properties or non-UK residents, based on the October 2024 rate bands.
Example use cases
Example prompt
“How much stamp duty will I owe on a £450,000 property in England if I'm a first-time buyer and it will be my only home?”
Technical details
Endpoint
POSThttps://web-production-18a32.up.railway.app/stamp-dutyWhen to prefer
Use this endpoint when you need to compute UK Stamp Duty Land Tax for a residential property purchase in England or Northern Ireland, especially when buyer status (first-time, additional property, non-resident) affects the calculation. Prefer over generic tax calculators when you need October 2024 rate accuracy including the updated 5% additional property surcharge.
Side effects
- Missing or invalid price (negative or non-numeric) returns a validation error
- Price below SDLT threshold returns zero tax
- Conflicting flags (e.g. first-time buyer + additional property) may yield unexpected results
- Non-boolean values for flag fields return a schema validation error
Input
{
"price": 450000,
"is_non_resident": false,
"is_first_time_buyer": true,
"is_additional_property": false
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| price | number | Property purchase price in GBP. |
| is_non_resident | boolean | Non-UK residents pay an extra 2% surcharge. |
| is_first_time_buyer | boolean | First-time buyers get relief on properties up to £625,000. |
| is_additional_property | boolean | Second homes / buy-to-let pay a 5% surcharge (Oct 2024 rates). |
Output
{
"price": 450000,
"breakdown": [
{
"tax": 0,
"band": "£0 – £300,000",
"rate": "0.0%"
},
{
"tax": 7500,
"band": "£300,000 – £500,000",
"rate": "5.0%"
}
],
"total_tax": 7500,
"buyer_type": "First-time buyer",
"effective_rate": 1.67
}Tags
x402
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