You need to reissue an engagement letter when the scope of services changes, when your terms change, when the regulatory position shifts, or when the party you’re engaged with changes. That’s the short answer.
But the situations that actually catch practices out are the grey areas. The scope change that looked minor. The client who incorporated, and nobody thought to check. The terms update that went on the website, but never got a client signature.
The difference between mandatory, strongly advisable, and “an addendum will do” is what most guides skip over. This one doesn’t.
What Reissuing an Engagement Letter Actually Means
Reissuing an engagement letter means:
sending a new engagement letter to a client and getting their signature on it. It replaces the previous letter in full and resets the contractual baseline between you and your client.
That’s different from an addendum, which is a supplementary document that amends specific terms without replacing the original letter entirely. And it’s different from a novation letter, which transfers the terms of an existing engagement to a new entity.
Each has its place. Choosing the wrong one is where the risk creeps in.
When You Must Reissue an Engagement Letter
Not every change demands you to reissue an engagement letter. But some do, and acting on the wrong assumption is exactly what leads to disputes you can’t win.
Situations That Require You to Reissue an Engagement Letter
There are certain situations where reissuing an engagement letter isn’t a judgment call. It’s a requirement. These include:
- The scope has changed, and the current letter doesn’t cover the new work
- The party you’re acting for has changed
- Your terms and conditions have materially changed
- A regulatory update affects what your letter must state
In any of these cases, you need to reissue an engagement letter.
Situations When It’s Advisable to Reissue an Engagement Letter
There are situations that don’t invalidate your existing letter but leave you significantly exposed if a dispute arises. These include:
- A fee change that isn’t documented in writing
- A client with new directors, new beneficial owners, or a restructured business
- A new partner, a rebrand, or a merger on your side
None of these automatically voids what you have. But “we didn’t update the letter” is not a position you want to be defending.
What Counts as a Scope Change?
A scope change is any addition, removal, or shift in the services you provide that isn’t covered by the terms of the existing engagement letter. If the letter no longer accurately describes what you’re doing for that client, the scope has changed.
There are specific changes to a client relationship that constitute a scope change and require you to reissue an engagement letter. These include:
- Adding a service such as payroll, VAT returns, or advisory work not covered by the original letter
- Removing a service you previously provided
- A client incorporating, moving from sole trader to limited company
- A change in who you’re acting for, including partnership changes, trustee changes, or changes in beneficial ownership
The incorporating client is the one who catches practices most off guard. When a sole trader incorporates, the company is a new legal entity. Your existing letter is with the individual. It does not cover the company. Post-incorporation, you’re typically producing company accounts and a corporation tax return for a client that has never signed anything with you. That company needs its own engagement letter. The original may still stand for the individual’s personal self-assessment, but you now have two clients, not one.
Reissue, Addendum, or Novation Letter: Which One Do You Need?
Reissue, addendum, and novation letters are three distinct documents that get used interchangeably when they shouldn’t be. Each one applies to a different situation.
Here’s how to tell them apart and when to use each one.
The novation letter is the one most practices aren’t aware of. The ICAEW has acknowledged it as a valid route when a practice incorporates, though it doesn’t currently provide a template.
How Often Should You Reissue an Engagement Letters as Standard?
The standard answer is annually, and it’s the right one. But there are two ways to apply it, and they’re not the same thing.
Annual as a blanket policy means every client gets a fresh letter once a year, at the same time each year, regardless of whether anything has changed. It’s administratively heavier but removes any question about whether a trigger was caught.
Annual, as a minimum floor, means you reissue an engagement letter on trigger as soon as something changes and treat the annual review as a safety net for anything that slipped through. For most practices, this is the more practical approach. The risk is that the annual review gets deprioritized when things are busy, which is exactly when stale letters accumulate. Whatever cadence you choose, build it into your workflow rather than relying on someone to remember.
What Happens If You Don't Reissue an Engagement Letter When You Should?
There are four specific consequences that follow when engagement letters aren’t kept current.
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Reissuing engagement letters across a full client base is one of those tasks that never feels urgent until it is. When you’re managing dozens of clients, even a straightforward update becomes an afternoon of admin.
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But words only go so far. Book a demo and see it for yourself.
Conclusion
The trigger hierarchy is straightforward once you know it:
- Mandatory reissues before you continue acting
- Strongly advisable ones before a dispute forces your hand
- Annual review is the floor that catches everything else
The grey areas are where most practices get caught out. Scope changes that looked minor. Clients who incorporated without anyone updating the letter. The addendum should have been a full reissue.
That said, reissuing engagement letters across your entire client base isn’t easy. It’s time-consuming, it’s repetitive, and when done manually, it eats into hours that should be going elsewhere.
With FigsFlow, you can reissue an engagement letter, collect a digital signature, and have a fully documented client record in seconds. No admin pile-up. No chasing. No version confusion.
Frequently Asked Questions (FAQs)
At minimum, yes. Annual review is the floor, not a fixed rule. If a trigger occurs mid-year, such as a scope change or a change in client circumstances, reissue at that point rather than waiting. The annual review exists to catch anything that slipped through between triggers.
It’s strongly advisable. If the original letter references a specific fee and you’re now charging more, your contractual basis for recovering the difference is weak without a new signed document. A full reissue with a digital signature gives you the clearest evidence if a dispute arises.
Yes, in some cases. An addendum works when the change is contained, doesn’t affect core terms or liability, and the original letter remains accurate for everything else. It’s not appropriate when the party has changed, terms have materially shifted, or the original letter would give a misleading picture of the engagement.
Yes. Work carried out by the incorporated company isn’t covered by your previous sole trader terms. You can reissue full letters under the new company name or use a novation letter to transfer existing agreements to the new entity. Either way, you need a client agreement in writing before continuing to act.
A novation letter transfers the rights and obligations of an existing contract to a new entity, in this context, from a sole trader practice to a newly incorporated company. It requires client agreement and needs to be drafted carefully. It’s a different legal mechanism for achieving the same outcome as a full reissue, not a shortcut around it.
