{"uid":"cap_cCk7oP44j7T3uJ178QGQs","slug":"uk-stamp-duty-land-tax-sdlt-calculator-9ddc9b7f","name":"UK Stamp Duty Land Tax (SDLT) Calculator","description":"UK Stamp Duty Land Tax (SDLT) calculator with first-time buyer relief and surcharges.","url":"https://web-production-18a32.up.railway.app/stamp-duty","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"price":{"type":"number","minimum":0,"description":"Property purchase price in GBP."},"is_non_resident":{"type":"boolean","description":"Non-UK residents pay an extra 2% surcharge."},"is_first_time_buyer":{"type":"boolean","description":"First-time buyers get relief on properties up to £625,000."},"is_additional_property":{"type":"boolean","description":"Second homes / buy-to-let pay a 5% surcharge (Oct 2024 rates)."}}},"responseSchema":null,"example":{"request":{"price":450000,"is_non_resident":false,"is_first_time_buyer":true,"is_additional_property":false},"response":{"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}},"exampleRequest":{"price":450000,"is_non_resident":false,"is_first_time_buyer":true,"is_additional_property":false},"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_KYmmxR13OhccbVoHayw8Q","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"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.","exampleAgentPrompt":"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?","exampleUseCases":null,"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T18:35:09.664Z","isFirstParty":false}