UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcha
UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
930 msmedian answer time
$0.001listed price per call
$0.001price it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://property.payapi.market/stamp-duty
| Category | Market data |
|---|---|
| Provider host | property.payapi.market |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 6 from 3 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.001 | 930 ms |
Example input (from the provider)
{
"body": {
"is_additional_property": false,
"is_first_time_buyer": false,
"is_non_resident": false,
"price": 350000
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"is_additional_property": {
"description": "Second homes / buy-to-let pay a 5% surcharge (Oct 2024 rates).",
"type": "boolean"
},
"is_first_time_buyer": {
"description": "First-time buyers get relief on properties up to \u00a3625,000.",
"type": "boolean"
},
"is_non_resident": {
"description": "Non-UK residents pay an extra 2% surcharge.",
"type": "boolean"
},
"price": {
"description": "Property purchase price in GBP.",
"minimum": 0,
"type": "number"
}
},
"required": [
"price"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"breakdown": {
"description": "Band-by-band breakdown.",
"type": "array"
},
"buyer_type": {
"type": "string"
},
"effective_rate": {
"description": "Effective tax rate as a percentage.",
"type": "number"
},
"price": {
"type": "number"
},
"total_tax": {
"description": "Total SDLT payable in GBP.",
"type": "number"
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}