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How Do We Move Clients From a Practice We Have Bought Into Our Systems Without Losing Deadlines?

After buying a block of fees, accountants must move clients, deadlines and data from the seller's systems. We build transfer tooling, checks and client letters.

Updated 3 min readBy SpiderHunts Technologies

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Quick answer — TL;DR

Buying a practice or a fee block means moving clients, deadlines, jobs, documents and billing from the seller's systems into yours, while nothing falls due unnoticed. We build transfer tooling that extracts the seller's data, maps it to your practice software, checks it against Companies House and your own rules, lists gaps for your team, and sends clients a consistent welcome, with a deadline view that covers the handover period.

Three hundred new clients and a spreadsheet

The deal is done. The retiring practitioner's clients are yours. What you have received is an export from their practice software, a folder of documents organised their way, a spreadsheet of fees and a list of deadlines that may or may not be up to date. The first filing dates are only weeks away.

Your team starts setting clients up by hand. Some clients appear twice. Some have no year end recorded. Nobody is sure which ones have had this year's work started by the seller.

Two practices never store things the same way

Every practice structures its data differently: how clients are named, how services are recorded, how deadlines and jobs are tracked, where documents live. Even when both practices use the same software, the setup differs. So a transfer is less about copying and more about mapping and checking.

The risk during a transfer is time. Deadlines keep coming while the data is in transit, and a client whose work falls between the seller's system and yours is the one who misses a filing.

There is also the client side. Clients need to be told what is changing, who their new contact is, how to pay, and may need to give new authorisations. Doing that one by one takes weeks.

What a manual transfer risks

RiskEffect
Deadlines lost in transitFilings missed in the first months
Duplicate or incomplete recordsClean-up work for months after
Services not mappedWrong jobs scheduled or none at all
Inconsistent client lettersConfusion and clients who leave
Billing not set upFees for the first months not collected

The first year after an acquisition is also when clients decide whether to stay. A missed deadline or a confusing welcome in that period can undo the value of the deal.

How we build a transfer that can be checked

  1. We extract the seller's data from their practice software, accounts system and document store, through exports or APIs, into a staging area.
  2. Clients, contacts, services, fees and deadlines are mapped to your practice software's structure, with rules agreed with you, and duplicates are flagged for a person to merge.
  3. Company clients are checked against Companies House for names, numbers and due dates, and differences are listed.
  4. A gap report shows every client with missing information, such as no year end, no services or no fee, for your team to resolve before import.
  5. Once cleared, clients are imported into your practice software, and recurring jobs and billing are set up from the mapped services.
  6. A handover deadline view lists everything falling due in the first months, with who holds the work, and clients receive a welcome letter from your template with any actions they need to take.

Decisions about which clients to keep, what to charge and how to communicate are your practice's. The tooling makes the data move checkable.

A transfer you can see

Every client arrives with a record, services, deadlines and a fee, or on a list of gaps. The first months' deadlines are visible to your team from day one. Clients get a consistent, clear welcome. And the documents from the seller end up where your team expects to find them.

Is a transfer ahead of you?

  • You have bought or are buying a practice or fee block
  • The seller's data is in a different system or structure
  • Deadlines in the first months are a worry
  • Setting clients up by hand would take weeks
  • Client letters need to go out consistently

FAQ

Frequently asked questions

The questions readers ask us after this guide.

Still have a question?

Ask us directly — a senior engineer will get back to you.

Ask about your project

Can you move data between any two systems?

It depends on what each system can export and import. We look at both before committing to an approach.

What about client authorisations with HMRC?

Those are handled by your team and the clients through HMRC's own processes. The transfer tracks which clients still need them.

Do we need to keep the seller's system running?

Often for a period, so historic information stays accessible. We help you plan how long and how to archive it.

What drives the cost?

The number of clients, the seller's systems, the state of their data and how much of the document store needs restructuring.

Keep reading

More on Problems We Solve

Start here

Tell us about the practice you are bringing in

Describe the seller's systems, the number of clients and your own setup. We will tell you what a transfer would involve, and be clear about the parts that need people rather than software.

  1. You tell us what you needTwo minutes on the form, or a message on WhatsApp.
  2. A senior engineer reviews itAnd comes back with questions, a realistic range and an honest view on fit.
  3. Free 30-minute scoping callWe talk through scope, options and a realistic estimate — with no obligation.
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