How to Switch Accountants Without Disrupting Your Business

Switching accountants feels daunting, but it is one of the most straightforward changes you can make to your business, if you follow the right steps. This guide walks UK business owners, sole traders, limited company directors, landlords, and freelancers through the entire process, from knowing when to leave to getting your new accountant fully up to speed without missing a single deadline.

• When it is time to switch accountants
• What to sort out before you leave
• How to find the right new accountant
• Professional clearance: what it is and why it matters
• The handover process step by step
• Getting the timing right
• What to expect in the first few months
• Frequently asked questions

When it is time to switch accountants

Most business owners stay with the wrong accountant for far too long. Loyalty is admirable, but not when it costs you money, causes missed deadlines, or leaves you feeling in the dark about your own finances.

Here are clear signs that it is time to move on:

• You receive little to no proactive advice. Your accountant only contacts you at year end.
• Deadlines are being missed, or you are receiving penalty notices from HMRC.
• You cannot get a straight answer on your tax bill until the last moment.
• Your business has grown and your accountant cannot keep up. You need management accounts, cash flow forecasting, or sector-specific advice they cannot provide.
• They are not signed up to Making Tax Digital, which is increasingly important as MTD for Income Tax Self Assessment rolls out from April 2026.
• You are paying for services you never actually receive.
• They are hard to contact and slow to respond.

None of these are trivial complaints. Your accountant should save you more than they cost and give you confidence in your numbers throughout the year, not just in January.

What to sort out before you leave

Before you hand in your notice, take stock of where things stand. This protects you regardless of how cooperative your current accountant turns out to be.

Gather your records

Make sure you have copies of the following:

• Your last two to three years of filed accounts and tax returns
• Your most recent corporation tax computation and payment references (if you run a limited company)
• Your self assessment returns and HMRC payment history
• VAT registration certificate and recent VAT returns
• Payroll records and PAYE reference numbers if you have employees (your payroll history is essential)
• CIS records if you work in the construction sector: CIS returns must be filed monthly and a gap could cost you
• Your bookkeeping files or accounting software login details

You are legally entitled to your own records. Original documents such as bank statements and invoices belong to you. Files that your accountant has prepared, such as working papers, may belong to them, but your filed returns and accounts are yours.

Check your contract

Look at your engagement letter or terms of service. Most accountants require 30 to 90 days’ written notice. Some have auto-renewal clauses. Check whether you are tied in for a fixed period and plan your exit accordingly.

Do not leave mid-way through a job

If your accountant is currently preparing your year-end accounts or a VAT return, it is usually cleaner to let them finish it before switching. Handing over a half-completed job creates confusion and can lead to errors.

How to find the right new accountant

The best time to find a new accountant is before you leave your current one. Do not create a gap.

Know what you actually need

Different businesses need different things. A sole trader might just need self assessment and basic bookkeeping. A limited company director needs annual accounts, corporation tax, and likely director payroll. If you are a landlord, you need someone who understands property income rules. If you sell online, find an accountant with e-commerce experience.

Sector expertise matters. Healthcare professionals, content creators, and freelancers all face different tax considerations. A generalist accountant who does not understand your industry can miss legitimate deductions or give generic advice that does not apply to your situation.

Check their qualifications

Look for a firm that is regulated by a recognised professional body: the ACCA, ICAEW, or CIMA. “Accountant” is not a protected title in the UK, which means anyone can call themselves one. Chartered or certified firms are regulated and carry professional indemnity insurance.

Have a proper conversation first

Any accountant worth their fees will offer a free initial consultation. Use it. Ask them:

• How do you communicate with clients: email, phone, a client portal?
• What software do you use and will I have access to my own data?
• Do you have clients in my industry?
• What does your onboarding process look like?
• How will you handle the transition from my current accountant?

A good accountant will ask you as many questions as you ask them. They want to understand your business before quoting.

Professional clearance: what it is and why it matters

Once you have chosen your new accountant, the standard professional process is for your new firm to write to your old one. This is called a professional clearance letter.

The letter serves two purposes. First, it informs your current accountant that you are leaving. Second, it requests confirmation of any outstanding work, unpaid fees, or matters they believe the new accountant should know about.

Your old accountant is required by professional standards to respond promptly and honestly. They cannot withhold information simply because they are unhappy to lose a client, though they can hold back records if there are outstanding unpaid fees in some circumstances.

Your new accountant manages this process. You do not need to handle it yourself, though you should formally write to your old accountant to terminate the engagement and authorise the handover of information.

Authorising HMRC access

Your new accountant will also need to be authorised to deal with HMRC on your behalf. This is done through HMRC’s online agent authorisation process. You will typically receive a code in the post within seven to ten working days to confirm the authorisation. At the same time, your old accountant should be removed as your agent. Your new accountant can advise on this.

The handover process step by step

Here is a clear sequence to follow once you have decided to switch:

1. Choose your new accountant and confirm your engagement in writing.
2. Notify your current accountant in writing, giving the notice period required by your contract.
3. Your new accountant sends a professional clearance letter to your old firm.
4. Your old accountant responds with confirmation and any relevant information or outstanding matters.
5. Records and files are transferred: either digitally or by post.
6. HMRC agent authorisation is updated: your new accountant is added, your old one is removed.
7. Software access is transferred: if you use Xero, QuickBooks, or similar, your new accountant is given access to your account.
8. Your new accountant reviews your records and flags anything that needs attention.

The whole process typically takes two to four weeks. It rarely causes disruption if both accountants are professional and you have given proper notice.

What if your old accountant is uncooperative?

In most cases, handovers are smooth. Occasionally, a departing accountant delays the process or is unhelpful. If your old accountant is regulated by a professional body, you can raise a complaint with that body if they act improperly. Your new accountant can often work around delays by requesting records directly from HMRC or Companies House.

Getting the timing right

Timing your switch well can make the difference between a seamless transition and a stressful one.

The best times to switch

The ideal moment is immediately after your year-end accounts have been filed and your tax bill is settled. That way, your old accountant has completed a clean block of work and your new accountant starts with a blank slate from the new financial year.

For sole traders and self-employed individuals, the period between February and March is generally poor timing. Your accountant may be preparing your self assessment return for the January deadline. If that work is already in progress, wait until it is filed.

For limited companies, the best window is usually the month after your corporation tax return has been submitted.

Deadlines to keep in mind

Do not let the switch create a gap in compliance. Keep track of:

• Your next VAT return due date
• Your PAYE and payroll submission dates
• Your corporation tax payment deadline (nine months and one day after your year end)
• Your Companies House confirmation statement deadline
• Your self assessment payment on account dates (31 January and 31 July)
• Monthly CIS return deadlines if applicable

Your new accountant should take ownership of these dates from day one. Make sure they have everything in writing.

What to expect in the first few months

The first three months with a new accountant involves a review period. They will go through your previous returns, check that your records are complete, and identify anything that needs correcting or improving.

They may find things your old accountant missed

This happens more often than you might think. A fresh pair of eyes on your accounts sometimes turns up unclaimed expenses, incorrect VAT treatments, or missed reliefs. If your new accountant finds something significant, they can often correct it by filing an amended return: HMRC allows corrections within certain time limits.

Get set up on the right software

If you have not already moved to cloud accounting software, your new accountant will likely recommend it. Xero is widely used among UK small businesses. If you are new to it, our bookkeeping service can set it up and keep your records up to date for you. MTD for Income Tax Self Assessment starts in April 2026 for those with self-employment or property income over £50,000: cloud software is not optional for much longer.

Set expectations early

Tell your new accountant what communication style works for you. Do you want quarterly check-ins? Monthly management reports? Do you want them to flag your tax liability six months in advance so you can plan? A good accountant will adapt, but only if you tell them what you need.

Make sure they know your business model, your plans for the next twelve months, and any events on the horizon: a new employee, a property purchase, a dividend, or a business sale. The more context they have, the better the advice you will receive.

Review after six months

Give the relationship six months before making a judgement. Switching again too quickly rarely helps. By the six-month mark, you should have a clear sense of whether the communication, the quality of work, and the proactive advice are meeting your expectations.

Switching accountants is not a drastic act. It is a normal business decision. Done properly, it causes no disruption at all. The process is well-established, most accountants handle it regularly, and the benefits of working with the right firm almost always outweigh the short-term admin of making the change.

Frequently asked questions

Can I switch accountants at any time of year?

Yes, technically you can switch at any time. In practice, it is easier to switch after a key filing, such as your year-end accounts or self assessment return, has been completed. This avoids a mid-job handover and reduces the risk of anything being missed.

Will switching accountants affect my relationship with HMRC?

No. Changing your accountant does not flag anything unusual with HMRC. You simply update your agent authorisation through HMRC’s online portal, removing the old accountant and adding the new one. Your tax record is not affected.

What happens if I owe my old accountant money?

Your old accountant may withhold certain files until outstanding fees are paid, depending on the circumstances and your contract terms. It is best to settle any outstanding invoices before or during the switch. Your new accountant can advise you if there is a dispute about what is owed.

How long does it take to switch accountants?

The practical process, professional clearance, record transfer, and HMRC agent authorisation, typically takes two to four weeks. If you give proper notice and both firms are cooperative, the whole thing can be done without you needing to do much at all.

Do I need to tell HMRC myself that I have changed accountants?

No. Your new accountant handles the HMRC agent authorisation process. You will need to enter a code sent to your home address to confirm the new authorisation, but your new accountant will walk you through this. You do not need to contact HMRC directly.

Can my new accountant fix mistakes made by my old accountant?

Often, yes. If errors were made in previous returns, your new accountant can review them and, where appropriate, submit amendments to HMRC. There are time limits, generally four years for income tax and VAT, though longer in cases of fraud or carelessness, so it is worth asking your new accountant to review recent filings as part of their initial onboarding review.