How to Switch Your Accountant: The Complete UK Guide for 2026

Most small business owners who are unhappy with their accountant stay with them anyway. Not because they are satisfied — but because they assume switching will be complicated, disruptive, or awkward.

It is not. Switching accountant is a routine process that happens every day. Your new accountant handles almost everything. You write one email. The rest takes care of itself.

This guide explains exactly what to do, when to do it, and what to expect. We also cover the signs that it is time to move on, and the questions you should ask before choosing someone new.

Why People Switch Accountant — And Why Most Wait Too Long

The reasons people switch accountant are almost always the same. The surprising thing is how long most people put up with a poor service before doing anything about it.

The Most Common Reasons for Switching

No proactive advice. The most frequent complaint we hear is that the accountant only gets in touch when a deadline is approaching. They file the return, send the invoice, and disappear until next year. There is no tax planning, no strategic thinking, no sense that they are looking out for your business.

Constantly chasing for updates. You send documents and hear nothing. You call and get passed around. You ask a question by email and wait two weeks for a response. This is not acceptable service — it is not even average service.

Unexpected bills. Hourly billing creates anxiety. Every phone call, every question, every email potentially adds to the invoice. Fixed-fee accounting eliminates this entirely — you know exactly what you pay before the year starts.

You have outgrown them. Some accountants are excellent for very simple situations but lack the expertise to handle your business as it grows. If you are expanding, bringing in investors, hiring staff, dealing with VAT, or considering a restructure — you need an accountant who has experience with those situations.

They do not understand your business. A good accountant asks questions. They want to know how your business works, what your goals are, and where you are heading. If your accountant has never asked you any of these things, they are probably not giving you the advice you need.

Lack of digital tools. In 2026, with Making Tax Digital accelerating, every accountant should be fully digital. If yours is still asking you to post paper receipts or email spreadsheets manually, they are behind the curve — and that will matter more, not less, in the years ahead.

Signs It Is Definitely Time to Move

• You have received a penalty from HMRC because of a filing error or missed deadline
• Your accountant filed something incorrectly and did not offer to pay the penalty
• You cannot get a straight answer about what you owe or what you are paying for
• Your accountant cannot advise you on Making Tax Digital compliance
• You have never once had a proactive call or email with a tax-saving suggestion
• You dread dealing with them

If any of these apply to you, it is time to switch — and there is no reason to wait.

When Is the Best Time to Switch?

You can switch accountant at any time of the year. There is no rule that says you must wait until your year-end or a particular deadline has passed.

That said, there are times that create a cleaner transition:

• Just after year-end accounts are filed. This is the most common time to switch. Your current accountant has completed and filed everything for the year, so your new accountant starts with a clean slate at the beginning of a fresh financial year.
• After your Self Assessment return is submitted. For sole traders and landlords, once your personal tax return is done for the year, switching is straightforward.
• Before a major deadline. If you are approaching a corporation tax deadline or a VAT filing, it may make sense to either push the switch back a few weeks or bring it forward quickly so your new accountant can handle the filing from the start.

Do not let timing anxiety stop you from switching. A good accountant — including us — handles mid-year transitions all the time. We pick up wherever the previous accountant left off.

→ Start your switch to Britvex Advisory — it takes minutes to get started

How to Switch Accountant — Step by Step

Step 1: Choose Your New Accountant First

Before you do anything else, choose who you are moving to. This makes the whole process smoother — your new accountant will guide you through everything from this point on and will handle the communications with your outgoing accountant on your behalf.

Once you have decided, you will typically need to sign a letter of engagement with your new accountant to formally begin the relationship. This sets out what they will do for you and the fees agreed.

Step 2: Notify Your Current Accountant

You need to let your current accountant know that you are leaving and that you have appointed a new accountant. This does not need to be confrontational or detailed. A short email is entirely sufficient.

Something like this works perfectly:

“I am writing to let you know that I have decided to appoint a new accountant. My new accountant is [Firm Name]. Please acknowledge this email and confirm that you will respond to their professional clearance enquiry in due course. Thank you for your assistance over the past [X] years.”

That is all you need to say. You do not need to give a reason. You do not need to explain yourself. You are simply informing them of your decision.

Step 3: Professional Clearance

This is the formal part of the process that most people do not know about — and it is the part your new accountant handles entirely.

In accordance with professional ethics guidelines (ICAEW, ACCA and similar bodies), when a new accountant takes on a client from another accountant, they must write to the outgoing accountant requesting professional clearance. This letter asks:

• Whether there are any professional reasons why the new accountant should not act for you
• For details of any outstanding matters HMRC correspondence or open enquiries
• For confirmation of any fees outstanding that may affect the handover

The outgoing accountant is expected to respond promptly — typically within two weeks. In most cases, clearance is given without any issues and the process moves forward.

Step 4: Transfer of Records

Once professional clearance has been obtained, your records need to be transferred. This typically includes:

• Copies of the last two to three years of filed accounts and tax returns
• Trial balances and working papers (where they belong to you)
• HMRC correspondence, reference numbers and agent codes
• Payroll records and VAT history if applicable
• Any ongoing matters or open correspondence

Your outgoing accountant must return documents that belong to you — this includes filed accounts and tax returns. They may charge you for documents they have prepared but not yet been paid for, which is reasonable. They cannot, however, withhold your own records as a condition of payment.

Step 5: Update HMRC Agent Authorisation

Your new accountant will need to be authorised by HMRC to act on your behalf. They will handle this directly — you will typically receive an authorisation code by post from HMRC that you pass to your new accountant, or they will set up authorisation online. This is entirely standard and your new accountant will guide you through it.

Step 6: Brief Your New Accountant Properly

Once everything is transferred, make time to have a proper onboarding conversation with your new accountant. This is your opportunity to tell them:

• What your business does and how it works
• What has gone well and what has not with your finances
• What your goals are for the next one to three years
• Any tax or compliance issues you are aware of or concerned about
• Any upcoming changes — a planned sale, a new hire, a move to limited company status

A good accountant will want to know all of this. It is the beginning of an actually useful professional relationship.

→ Switch to Britvex Advisory — we handle the entire process for you

What to Look for in a New Accountant

Switching is only worth doing if you find someone genuinely better. Here is what actually matters when choosing an accountant in 2026.

Fixed Fees — Not Hourly Rates

Hourly billing creates a fundamentally bad dynamic. It makes you reluctant to ask questions. It makes every piece of advice feel like it is costing you money as you receive it. And it rewards inefficiency — an accountant who takes twice as long to do something charges you twice as much.

Fixed monthly fees aligned to a clear scope of work are the professional standard for modern accountancy. You should know exactly what you are paying before you agree, and there should be no surprises.

Proactive Communication

Your accountant should contact you — not the other way around. Before deadlines, before the budget, before year-end, when there is a tax change that affects you. If you only ever hear from them when they need something from you, that is not proactive service.

Digital First

In 2026, every accountant should be fully equipped for Making Tax Digital. They should use cloud accounting software, have a digital client portal for document exchange, and be able to give you real-time visibility of your numbers. This is table stakes — not a premium.

Genuine Expertise in Your Area

If you are a landlord, work with an accountant who genuinely understands property taxation — Section 24, CGT, FHLs, portfolio financing. If you are a contractor, work with someone who understands IR35 thoroughly. If you are a limited company director, your accountant should understand director dividend strategy, pension planning and the nuances of owner-managed businesses.

Generalist knowledge is fine for simple situations. But as your situation becomes more complex, specialist experience becomes genuinely valuable.

Responsiveness

You should receive a response to any query within one business day. Not two weeks. Not whenever they get around to it. One business day. This is a basic professional standard, and the right accountant will meet it consistently.

A Relationship, Not a Transaction

The best accountant relationships feel like having a knowledgeable colleague you can always call. Someone who knows your business, remembers your circumstances from year to year, and gives you advice that is specific to you — not generic guidance pulled from a template.

Questions to Ask Before You Switch

When you are evaluating a new accountant, ask these questions directly:

1. What is your fee structure and exactly what is included?
2. Who will I actually deal with day-to-day — you, or a junior member of staff?
3. How do you handle Making Tax Digital for businesses like mine?
4. What software do you use and will I have access to it?
5. What is your typical response time to client queries?
6. How often will you proactively contact me with advice or updates?
7. Do you have other clients in my industry?
8. What would you do differently from my current accountant if you were advising me?

Pay attention to how they answer — not just what they say. An accountant who gives vague, non-committal answers to these questions is probably going to give vague, non-committal advice once they are working for you.

How Britvex Advisory Handles Your Switch

When you switch to Britvex Advisory, we take care of the entire process. You do not need to deal with your old accountant — we write the professional clearance letter, collect your records, update your HMRC authorisation, and brief ourselves thoroughly on your situation before we start any work.

We offer fixed monthly fees agreed in advance — no hourly billing, no surprise invoices. Every client gets a dedicated accountant who knows their business. We respond to queries within one business day. And we are fully equipped for Making Tax Digital across all thresholds.

If you are unsure whether it is the right time to switch, book a free 30-minute call with us. We will give you an honest assessment of your current situation and tell you clearly whether we think we can add value. There is no obligation and no hard sell.

→ Switch to Britvex Advisory — start the process today

→ Book a free 30-minute consultation

→ Get a fixed fee quote for your business

Frequently Asked Questions

How do I tell my current accountant I am leaving?

Send a short email confirming you have appointed a new accountant and asking them to expect a professional clearance enquiry. You do not need to give a reason. Your new accountant handles everything from that point.

Will I lose my records if I switch accountant?

No. Your records belong to you. Your outgoing accountant must provide all documents that belong to you. There may be a fee for work completed but not yet paid for — which is reasonable — but they cannot withhold your records.

When is the best time to switch accountant?

Just after your accounts are filed is the cleanest time — but you can switch at any point in the year. A good new accountant handles mid-year transitions routinely.

How long does switching accountant take?

Typically two to four weeks from the point you notify your current accountant. Professional clearance usually takes one to two weeks. Your new accountant manages the whole process.