Built for UK conveyancing firms · HMRC SDLT XML schema v6.3 · Calculated in whole pence
Post-completion shouldn't be this painful
Every completion triggers a cascade of deadlines, filings, and follow-ups. Miss one and your client pays the price.
14 days to file SDLT
Miss the deadline and there is an automatic £100 penalty, or £200 if the return is more than 3 months late. Interest runs on any tax paid late.
Manual re-keying
The same client, property, and transaction data gets typed into SDLT forms, Land Registry applications, and your case management system separately.
No visibility
Which completions need SDLT filing? Has the SDLT5 come back? When does the priority search expire? It's all in someone's head or a spreadsheet.
File SDLT in three steps
No training required. If you can use a web browser, you can use StampSorted.
Enter the details
Property, buyer, consideration — our guided wizard walks you through every field HMRC needs. Auto-calculates SDLT in real time.
Review & sign
Check the band breakdown, preview the HMRC XML, and sign the declaration. Everything validated before it leaves your screen.
Submit & track
We send the return to HMRC and track it through to SDLT5. You get notified at every stage — no chasing, no guessing.
One platform for everything after exchange
StampSorted handles the post-completion workflow end to end — so you can focus on your clients, not chasing deadlines.
SDLT Filing
LiveCalculate, validate, and submit SDLT returns directly to HMRC. Residential, commercial, leases, linked transactions — all supported.
Post-Completion Tracking
LiveEvery completion on one dashboard — SDLT status, filing deadlines, SDLT5 certificates, penalty alerts. Nothing slips through.
Multi-User Firms
LiveInvite your team, share returns across the firm, manage permissions. Everyone sees the same data — no more emailing spreadsheets.
Land Registry AP1
Coming soonSubmit AP1 applications to HM Land Registry via Business Gateway. Auto-populated from your SDLT filing data — no re-typing.
Free tools you can use today
No sign-up required. Professional-grade tools for conveyancers.
SDLT Calculator
Calculate stamp duty for any scenario — residential, commercial, first-time buyer, additional properties, non-residents, and companies. Accurate to the penny.
Calculate now→Registration Checker
Find out if your firm needs to register with HMRC as a tax adviser by 18 August 2026. Two-minute assessment with a personalised action plan.
Start assessment→Built to HMRC specs
SDLT XML schema v6.3
AES-256 Encryption
Credentials encrypted at rest
Whole-pence maths
No floating-point rounding
Audit trail
Edits and status changes logged
What the return wizard covers
The parts of an SDLT1 return that usually send people back to the paper guidance are built into the wizard.
- Joint purchases with several buyers on one return
- Linked transactions, with the tax apportioned across each return
- Leases: premium plus NPV of rent at the 3.5% discount rate
- Consideration split into cash, debt, contingent and VAT
- Higher rates, non-resident surcharge and the 17% company rate
- XML preview before anything is sent
- 14-day filing deadline tracked on the dashboard
Weighing up providers? Here is what to check when choosing SDLT software →
Common questions
Is my data secure?
HMRC credentials are encrypted at rest with AES-256-GCM, every page is served over HTTPS, and sessions use cryptographically random tokens. Our privacy policy lists the providers that process data on our behalf and where they are based.
Do I need to install any software?
No. StampSorted is a modern web application that works in any browser. No desktop software, no Java, no plugins — just log in and go.
What if I'm already using InfoTrack or Oyez?
You can run StampSorted alongside your existing provider while you evaluate it. The free tier covers 3 returns a month, which is enough to put a few real files through both systems and compare.
Can my whole team use it?
Yes. A firm admin can invite colleagues, set their role, and remove them. Everyone in the firm works from the same returns, deadlines and SDLT5 certificates. See the pricing page for what each plan includes.
What types of SDLT return does it support?
Residential purchases, commercial/mixed-use, first-time buyers, additional properties, non-resident surcharge, company purchases, linked transactions, and leases (including NPV calculations).
Is there a contract or commitment?
No. All plans are month-to-month. You can upgrade, downgrade, or cancel at any time. The free tier is free forever — no credit card required.