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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 property.payapi.market, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Calculates UK Stamp Duty Land Tax owed on a property purchase, applying first-time buyer relief and surcharges for additional properties or non-residents.
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
Returns the calculated UK Stamp Duty Land Tax amount in GBP for the given property price, incorporating first-time buyer relief (for properties up to £625,000), the 5% additional property surcharge (Oct 2024 rates), and the 2% non-resident surcharge where applicable.
Example use cases
Example prompt
“How much stamp duty will I owe on a £525,000 house in the UK? I'm a first-time buyer and a UK resident, and it's not an additional property.”
Technical details
Endpoint
POSThttps://property.payapi.market/stamp-dutyWhen to prefer
Use this endpoint when you need to compute UK Stamp Duty Land Tax for a property transaction and need to account for first-time buyer relief, additional property surcharges (Oct 2024 rates), or the non-resident 2% surcharge. Prefer this over generic tax calculators when dealing specifically with England/Northern Ireland SDLT rules.
Side effects
- Invalid or negative property price returns validation error
- Missing required 'price' field returns 400 bad request
- Boolean flag type mismatch returns schema validation error
- Server error if upstream computation fails
- Payment not processed (402) if x402 payment header is missing or incorrect
Input
{
"price": 525000,
"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": 525000,
"breakdown": [
{
"tax": 0,
"band": "£0 – £300,000",
"rate": "0.0%"
},
{
"tax": 10000,
"band": "£300,000 – £500,000",
"rate": "5.0%"
},
{
"tax": 1250,
"band": "£500,000 – £625,000",
"rate": "5.0%"
}
],
"total_tax": 11250,
"buyer_type": "First-time buyer",
"effective_rate": 2.14
}Tags
x402
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