Your advice is only as strong as your client's records.

The execution layer that turns your advice into evidence

A day-by-day evidence trail that holds up under scrutiny.

The gap between advice and execution is where things go wrong.

HMRC opened over 93,000 investigations in 2023 alone. The cases that fail aren't the ones with bad advice — they're the ones with incomplete records. Daysium sits alongside your advice, giving clients a day-by-day record built to be disclosed, not reconstructed.

See Why Spreadsheets Fall Short

Automatic day counting

Logs location continuously via smartphone. No manual input from your client.

Evidence that withstands scrutiny

Geo-tagged, timestamped photos create a contemporaneous evidence trail. Built for disclosure.

Your clients stay closer to you

A structured reason to stay involved in your client's compliance year-round — not just at the point of advice.

No operational burden on your firm

We handle onboarding and support. You make the introduction — we do the rest.

Flexible commercial arrangements

No contract required. Introduce clients informally and formalise over time if it makes sense.

Getting started is simple

Most firms start with a few clients. Book a 20-minute call to see how it works.

Automatic day counting

Logs location continuously via smartphone. No manual input from your client.

Evidence that withstands scrutiny

Geo-tagged, timestamped photos create a contemporaneous evidence trail. Built for disclosure.

Your clients stay closer to you

A structured reason to stay involved in your client's compliance year-round — not just at the point of advice.

No operational burden on your firm

We handle onboarding and support. You make the introduction — we do the rest.

Flexible commercial arrangements

No contract required. Introduce clients informally and formalise over time if it makes sense.

Getting started is simple

Most firms start with a few clients. Book a 20-minute call to see how it works.

See Why Spreadsheets Fall Short

Achieving Success Through Collaborative Partnerships

Created in partnership with industry experts, Daysium tackles the complex challenges of day counting and record-keeping for tax residency. Our partner community plays an active role in realising this vision, bringing deep expertise in tax compliance for the globally mobile.

Founding Partners
Valuable Partnerships

"A pioneering company in the field of day counting and record-keeping. Their innovative tool simplifies complex date-related calculations, offering immense value to our clients. This partnership marks a significant step towards enhancing our client services with advanced solutions."

Alan Kennedy,
Managing Director,
Trident Tax
Exciting technology

"The technology that Daysium has developed is incredibly exciting and I’ve really been enjoying getting under the hood of what’s in store for individuals that utilise the software! The team's passion and vision for solving the ongoing nightmare of tracking for residency status is brilliantly evident."

Rhys Thomas,
Managing Director,
WTT Group
Simplifying international tax

"The Daysium team deliver technology that makes taxes easier for expats and globally mobile individuals. What's not to like about that? We're really excited to work with them and offer our clients the ability to use this technology."

Stephanie Wickham,
Founder,
Expat Taxes
Protect yourself in a tax dispute

"Users of Daysium will be unlikely to see any additional tax liabilities if the platform has been used correctly.

Should any additional tax liabilities arise though, I would certainly be confident to put forward arguments that the use of the software was itself a means of taking reasonable care to pay the correct amount of tax."

Sarah Scala,
Director NHD Tax
Solutions & Founder of
The Contentious Tax Group

Ready to see how Daysium fits your practice?

Book a 20-minute call. We’ll explain how Daysium works, how it complements your advice, and what the introduction process looks like.

Common questions from advisors

What advisors typically ask before introducing Daysium to clients.

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Does recommending Daysium create any regulatory obligations for my firm?

Does recommending Daysium create any regulatory obligations for my firm?

Does recommending Daysium create any regulatory obligations for my firm?

No. Daysium is a record-keeping and day-counting tool, not a financial or tax advisory product. Introducing it to clients as a useful resource does not trigger FCA or professional regulatory obligations. We recommend advisors review this with their compliance team as appropriate to their firm.

What happens if a client is investigated by HMRC?

What happens if a client is investigated by HMRC?

What happens if a client is investigated by HMRC?

Daysium provides a complete, structured record of the client's location history. This evidence is exportable and structured for disclosure — not reconstructed from memory. We work with advisors and their clients to support the process.

How does Daysium handle client data?

How does Daysium handle client data?

How does Daysium handle client data?

All data is stored on Google Cloud Platform, which holds ISO/IEC 27001:2022 certification. Data is encrypted, access-controlled, and never shared with third parties. Full details are in our Privacy Policy.

What does it cost clients?

What does it cost clients?

What does it cost clients?

Daysium is available on four tiers — Executive (£950/year), Private Client (£2,500/year), Platinum (£5,000/year), and Enterprise (bespoke). The right tier depends on the client's complexity and jurisdiction requirements. We're happy to advise on the best fit on a call.

Is there a commission or referral arrangement?

Is there a commission or referral arrangement?

Is there a commission or referral arrangement?

Yes. We have structured referral arrangements for introducing advisors. Details are discussed on the call and documented in a formal agreement. There is no obligation to have a commercial arrangement to recommend Daysium.

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