The UK’s only accurate SDLT calculation software designed for conveyancers.

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Our Software

Delivering accurate, risk free property tax calculations.

Delivering accurate, risk free property tax

Compass software applies specialist tax rules and high-level questioning tailored to every transaction in order to calculate SDLT, LTT and LBTT. Designed for law firms who do not have the specialist knowledge of tax and wish to confidently calculate SDLT with precision accuracy every single time, ensuring a professional and seamless journey for you client.

Compass does the hard work for you. Unlike generic online stamp duty calculators, a complex algorithm runs in the background to ensure all 50 reliefs, plus exemptions and surcharges, are explored and applied where applicable. The result being the client pays the exact amount of Stamp Duty.

No more, no less, no error, no confusion.
Who are we for?

Built for you - the risk averse, forward thinking conveyancer.

We’re here to reduce miscalculation of SDLT from 30% to 0%. Many errors creep calculating HRAD, Non-Resident Surcharge, Multiple Dwellings Relief, Residential, Mixed and Commercial. However, we are here to help you. Our technology platform makes sure you answer all the right questions to get to indemnified, accurate calculation.
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We calculate for (but not limited to)
Higher Rate for Additional Dwellings (HRAD)

The complexities on when, and to whom, HRAD applies are completely solved within Compass. HRAD can be quite difficult to decipher, especially when clients aren’t just buying second homes or if they have previously sold a home but not immediately replaced it. Further complexities arise when looking at it’s interaction with other parts of SDLT such as the Non-Resident Surcharge, Mixed use, or any reliefs.

Worry no more! Compass guides you through the right questions, and accurately analyses the exposure to HRAD in each case.

The Non-Resident Surcharge

Now, even lifetime UK residents can be caught by this if they’ve spent too much time outside of the UK in the year before completion. Further complicating it are exemptions for certain property types, company types, and additional complexities for Partnerships where one or more of the partners meets the overcomplicated tests.

Fortunately, Compass has all these complexities analysed and calculated!

Residential, Mixed, Commercial.

Understanding the type of property can be challenging due to the intricate legal nuances. It's so complex that even experts have engaged in ongoing discussions with HMRC for years, seeking clarity.

We stay updated with the latest case law and guidance from HMRC to ensure your calculations are always accurate and up-to-date!

Annexes, and Multiple Dwellings Relief

This is a highly miscalculated area, one which “Ambulance Chasers” are hot on the heels of. Any property that had the word “Annexe” listed against it online will receive a letter from these companies immediately after completion. Unfortunately, there are some hidden complexities with the definition of Annexe for tax purposes that means spurious claims are being raised fairly too often.

Using Compass, any annexe will be analysed for its legal viability for the relief and your clients will never overpay in the specialised area.

Other UK Reliefs.

There are now 50 UK reliefs, each one with its own set of conditions and legal standards to meet. These get even further complex when their conditions require accurate analysis of the points above. Sometimes the relief can be completely invalided based on these factors.

Compass accounts for all these complexities, their interactions, and their final application.


Leases are some of the most complicated parts of tax legislation. To even further complicate things, leases that involve a premium paid must account for all the above and analyse the exposure to tax accurately. The tax calculation for leases involves an incredibly complicated time discounted rate formula – and these are the simple kinds of Leases. When considering rent free periods, transitional events, substantial performance and more; the complexity rapidly skyrockets.

Compass has developed the most in-depth, accurate, and easy to use calculator ever devised. With 62 lease types and sub-types we are able to calculate more, faster, than any other product on the market. For firms that would have avoided complex leasehold matters, you can now use compass as a value-add and capture paid work you would otherwise have had to avoid.

Reasons why you should be using Compass

  • Indemnified calculation to stop SDLT claims
  • Free submission to HMRC
  • Communicate with your client digitally
  • Audit trail to support compliance assessments
  • Dedicated client care team
  • Easy-to-use software 24/7
  • PROVEN to significantly reduce PII
  • Digital SDLT, LTT, LBTT calculations
  • Residential, Commercial & Leasehold  transactions
  • Pre-populated forms
  • Post completion management tools
  • Electronic signature

Insights & Advice

A brighter future for property tax, today!

SDLT, LTT, LBTT - you can deliver property tax calculations with certainty and confidence