The short answer
An engagement letter is the document that sets out what you'll do for a client, what they'll pay, and the terms you're both agreeing to, and for a UK accountancy practice it needs to be in place and agreed before chargeable work properly begins. The template itself is the easy part, plenty exist already through your professional body or practice software. What actually eats time is the repetition: filling in the same fields with different client details, sending it out, chasing a signature that's gone quiet, and filing the signed copy somewhere it can actually be found again. Automating that sequence, while keeping a human checking anything non-standard before it goes out, removes most of the retyping without removing the judgement.
The template isn't the problem
Search for an engagement letter template and you'll find no shortage of them, from your professional body, from practice software vendors, from generic legal template sites. The letter's wording is rarely where a practice actually loses time. The time goes on opening last year's version, changing the name and a handful of details, checking nothing in the scope has changed, saving it somewhere, emailing it over, and then remembering, days or weeks later, that it still hasn't come back signed. Do that for every new client, every scope change and every annual review, and the letter itself was never the bottleneck.
When a letter should be triggered automatically
A fresh engagement letter is needed more often than practices tend to generate one for:
- a brand new client, obviously
- a new service added for an existing client (bookkeeping added to tax, say)
- a material change in scope on existing work
- an annual review, which some professional bodies expect even where nothing's changed
- a change of fee basis, moving from fixed fee to a different arrangement
Each of these is a trigger that can generate the letter automatically from data you already hold, a new client record created, a service added to an existing one, rather than relying on someone remembering that this particular change needed fresh paperwork. The hardest part in practice isn't the automation itself, it's agreeing which of these triggers genuinely apply to how your practice works, since that list differs slightly between firms and professional bodies.
From client data to signed letter
Once a trigger fires, the letter can generate itself from the client's own record: name, services, fee basis and any other field your template needs, pulled from your practice software or CRM rather than typed in by hand. From there it goes out for e-signature rather than as a PDF attachment waiting to be printed, signed and scanned back. If it sits unsigned past a set number of days, an automatic reminder goes out, the same gentle chase a late invoice gets, rather than depending on someone noticing it's overdue. Once signed, it's filed back against the client record automatically, so there's no separate folder to remember to update.
Keeping a human sign-off for anything non-standard
Automating the generation and chasing doesn't mean every letter goes out unchecked. Anything standard, a new client on your usual terms, an annual review with no scope change, can reasonably go straight from generation to signature request. Anything non-standard, a bespoke fee arrangement, an unusual scope, a client with a complicating factor, should route to a partner for a quick look before it's sent, same as it would on paper. The automation's job is handling the predictable majority reliably, not replacing judgement on the exceptions.
Filing it back to your practice software, and re-issuing on scope change
A signed letter that lives only in an email thread is as good as lost the first time someone needs to check it months later. Filing it back automatically against the client record in whatever you use, Xero Practice Manager, Karbon or similar, means it's findable exactly where everything else about that client already sits. The fuller comparison of practice software options is worth a look if you're not sure yours is set up to make this easy. When scope genuinely changes, a new letter generates and goes through the same signing and filing process rather than a side-letter or an email confirming "we've also agreed to...", which rarely gets the same attention a proper document does.
When to get help, and what we'd do
Document and form automation is a guide price from £500 and usually live within one to three weeks, covering the letter generation, the e-signature step and the automatic filing back to your practice software. Where a client's onboarding has several other document-heavy steps alongside the letter, identity requests, information packs, it's usually efficient to automate them together rather than as separate projects, since they draw on the same client data and the same chase-and-file pattern. These are guide prices for a typical setup, with the fixed quote following a free 30-minute call. For the wider picture of why practice admin piles up, see our pillar page on admin eating your evenings.
Frequently asked questions
What is an engagement letter in accounting?
It's the document that sets out what a practice will do for a client, the fee basis, and the terms both sides are agreeing to. It needs to be agreed before chargeable work properly begins, and it's a requirement most professional bodies expect practices to meet consistently.
Does automating the engagement letter remove the need for a partner to check it?
No, and it shouldn't. Standard letters on your usual terms can go straight to signature, but anything with an unusual scope or fee arrangement should still get a quick human look before it's sent, the same as it would on paper.
How do we handle re-issuing a letter when a client's scope changes?
The change triggers a new letter generated from the updated details, which goes through the same signing and filing process as the original. This keeps a proper record rather than relying on an email confirming the change informally.
Will this work with the e-signature tool we already use?
Usually yes. Most document automation connects to an existing e-signature tool rather than replacing it, so the generation and chasing happen automatically while signing stays wherever your clients are already used to doing it.
How long does setting this up actually take?
Most projects like this are live within one to three weeks, often starting with the most common letter type, a standard new client engagement, before extending to annual reviews and scope changes. Nothing already sent out the old way needs retyping, the automation simply applies from the next trigger onward.