How to switch accountants without the disruption

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How to switch accountants without the disruption

This is for directors of owner-managed UK businesses who have decided their current arrangement isn’t working and want to know what actually happens next. It covers notice, professional clearance, the records to ask for, HMRC authorisations and the timing around your year end.

Updated 26 September 2026

11 min read

The short version

  • Switching is a handover of records, authorities and responsibility, and the order you do things in matters more than the notice letter.
  • Notice goes in writing, and the useful thing you get back is a disengagement letter listing what has been filed and what is outstanding.
  • Professional clearance is a letter between accountants; your only job is giving written authority for your records to be released.
  • HMRC authority is held tax by tax, so a new authorisation replaces the old one only for that tax.
  • The cleanest time to move is once the year-end filings are done, though mid-year switches work with a little planning.

What a switch actually involves

Most owners who want to know how to switch accountants without the disruption have already made the decision. What holds them up is the admin they imagine sitting behind it.

The work is real, but it is mostly bounded and mostly not yours. A handover has four moving parts: notice to the outgoing practice, professional clearance between the two firms, the transfer of records, and the HMRC and software access that follows.

The disruption people fear comes from doing those four things in the wrong order, or leaving one of them half done. A VAT return falls due while nobody holds the authorisation. Opening balances get carried forward without being checked. The registered office stays at the old accountant’s address and the post stops arriving.

This guide walks through each part in the order it happens, with the timing questions that usually decide when to move. At Ardein the handover from your current accountant is managed for you at no separate charge, so the section on our own process is there for comparison rather than as a sales pitch.

Deciding whether to switch, and when to stop waiting

Switching takes a few hours of your attention. Staying with the wrong arrangement costs you decisions you keep postponing.

The useful test is whether the numbers arrive early enough to change anything. Accounts filed nine months after year end satisfy Companies House. They tell you nothing about whether you can afford the hire you were weighing up in March.

Signs the arrangement has stopped working

  • Deadlines are met at the last moment, or missed altogether.
  • Accounts arrive eight or nine months after your year end.
  • Emails sit unanswered for a fortnight.
  • Nobody has ever asked you about your debtors or your cash.
  • Answers come back in language you have to translate.
  • The fee has risen while the service has stayed the same.

When a conversation is worth having first

Sometimes the practice is fine and the scope is wrong. You bought an annual filing service, and what you need now is monthly management information.

Ask your current accountant what monthly reporting would involve and when it would land. A vague answer tells you something useful either way.

Be honest about your own side too. Records handed over in a carrier bag each January will produce late accounts at any firm.

Before you write to anyone, note down the decision you could not make last year for want of numbers. It might be a hire, a price rise, or a supplier you wanted to replace. That is the reason to move, and it is also the brief for whoever takes over.

Giving notice, and what to ask for in return

Notice is a short letter, and the valuable part is what you request alongside it.

Read the engagement letter first

Your engagement letter sets out any notice terms and how fees are settled on exit. Some practices bill to the end of the current period. Others stop at the date you leave.

Read it before you write anything. It tells you what the final invoice is likely to look like.

What the notice letter needs to cover

  • That you are ending the engagement, and from what date.
  • The name of your new accountant, so clearance is expected.
  • Written authority to release your records and answer their questions.
  • A request for a disengagement letter.

You do not owe anyone an explanation. A factual, courteous letter keeps the handover cooperative, which is entirely in your interest.

The disengagement letter

This is the outgoing practice’s summary of where things stand. It should confirm what has been filed, what remains outstanding, and which deadlines fall next.

Keep it somewhere you can find it. It becomes the checklist your new accountant works from in the first fortnight.

One practical point. If you are in the middle of a disagreement about a fee, settle that separately and quickly. Records have a habit of moving slowly while an invoice sits open.

Professional clearance and what it does

Clearance is a letter between the two accountants, and you have one job inside it.

Your incoming accountant writes to the outgoing one. The letter asks whether there is any professional reason they should not act for you, and requests your records and the information behind the last filed figures.

Your part is the written authority allowing that information to be released. Without it the outgoing practice cannot reply, and the whole thing stalls.

What clearance does not do

It is not permission to leave. You can change accountant whenever you choose, and the outgoing firm cannot refuse.

Nor is it a judgement on you. The reply is usually a couple of lines confirming nothing stands in the way.

When the reply is slow

Some practices respond within days. Others take weeks, particularly in January and around the filing peaks.

Chase in writing and keep a note of the dates. If nothing ever comes, a new accountant can rebuild the position from filed returns and bank statements. That takes longer and costs more, so it is worth pressing politely first.

Working papers are a separate question

Your own records belong to you. The outgoing accountant’s internal working papers belong to them, and some charge for copies.

Ask for the trial balance and the supporting schedules in the clearance letter itself. That is normally enough to carry balances forward safely without paying for anything extra.

The records to ask for before you go

A handover is only as good as the list you ask for, so write the list before you send the notice.

From your outgoing accountant

  • The last two sets of filed accounts.
  • The trial balance at the last year end, with supporting schedules.
  • Corporation tax computations and returns, including any losses carried forward.
  • The fixed asset register and the capital allowances pool positions.
  • Filed VAT returns and the workings behind them.
  • Payroll records: RTI submissions, P60s, P45s and the pension scheme details.
  • Director loan account history and dividend paperwork.
  • Self Assessment returns for the directors, where the practice prepared them.

From your own systems

If the bookkeeping sits in Xero or something similar, check who owns the subscription. Where the practice holds it, the file needs moving into your name before anything else happens.

Gather bank feeds and logins, the last twelve months of statements, and any loan or finance agreements. Most of the delay in a handover comes from hunting for these later.

The one nearly everyone forgets

If your registered office is at the accountant’s address, arrange a new one before you part company.

Companies House and HMRC correspondence follows the registered office. Post sent to an address you no longer use tends not to reach you, and penalty notices are exactly the sort of letter that goes astray.

HMRC authorisations: what moves and what doesn’t

HMRC holds agent authority tax by tax, so changing one does not change the rest.

A new authorisation request replaces the existing authority for that tax only. Authorising your new accountant for VAT leaves your Corporation Tax agent exactly where it was.

How each authority moves

  • VAT and Making Tax Digital for Income Tax use a digital handshake. You approve an invitation inside your own HMRC account.
  • Corporation Tax, Self Assessment and PAYE for employers are dealt with in your business tax account, under Manage account.
  • Capital Gains Tax on UK property, trust and estate services and the Income Record Viewer also use the digital handshake.

Removing an agent from Making Tax Digital for Income Tax does not remove them from Self Assessment. You have to do both, and the same applies in reverse.

For VAT and employer PAYE there is a further step. Stopping an agent from dealing with HMRC in writing or by phone takes a separate instruction, sent by post or made by telephone. The postal address is the Central Agent Authorisation Team, National Insurance Contributions and Employer Office, HMRC, BX9 1AN. Current guidance sits on GOV.UK.

Two other keys to the house

Your Companies House authentication code belongs to the company. Make sure you hold it yourself rather than relying on the old practice.

And the filings stay your responsibility as a director. An agent files on your behalf, but the duty never transfers.

Timing the move around your year end

Timing decides how much work is carried in flight, and your year end is the natural break point.

Straight after the year-end filings

The tidiest moment is once the accounts and corporation tax return for the last year have been filed. The balances are settled, and whoever takes over starts from a known position rather than a half-finished one.

Mid-year moves

Mid-year switches are common and they work. Pick a boundary rather than a random Tuesday: the end of a VAT quarter is the obvious one, and a payroll month end helps.

Payroll is the fiddliest piece to move. Changing at 6 April avoids part-year figures being rekeyed and reconciled.

Do not wait for a late accountant

If your accounts are already months overdue, waiting for them is delay with a filing penalty attached.

In that situation the incoming accountant takes the overdue year on as part of the handover. There is more work at the front, and you buy back the months you would otherwise spend waiting.

How long it takes in practice

Identity checks and engagement take a few days, and clearance depends on how quickly the other practice replies. Records and access usually settle within two to four weeks.

Your own involvement is smaller than you expect: approving authorisations, signing one letter, and answering questions about how the business runs.

How a managed handover runs

This is the sequence we use at Ardein, and the handover from your current accountant is managed at no separate charge. Compare it with whatever your next accountant proposes.

  1. Scope agreed and checks completed — Before anything moves, we agree what the work actually covers each month and complete client due diligence and anti-money-laundering checks. That means photo identification and proof of address for the directors. It takes a day or two, and no records can be requested until it is done.
  2. Engagement letter and your authority — You sign an engagement letter setting out who does what and by when. You also give written authority for your outgoing accountant to release records and respond to questions. We draft the notice letter for you if you would rather not write it yourself.
  3. Clearance letter and records request — We write to the outgoing practice asking whether there is any professional reason we should not act, and request the records in one list rather than several. Trial balance, schedules, tax computations, VAT workings and payroll data go in the first letter, so nothing needs chasing twice.
  4. HMRC and software access moved — We send the agent authorisation requests for each relevant tax and tell you exactly which ones need approving in your own HMRC account. At the same time we check who owns the bookkeeping subscription, confirm the registered office, and make sure you hold your Companies House authentication code.
  5. Opening balances checked, not assumed — We reconcile what arrives rather than importing it. Bank balances, debtors, creditors, VAT and the director loan account get agreed back to evidence. This is the stage that surfaces things nobody mentioned, such as sales delivered and never invoiced, or funding drawn with the paperwork unfinished.
  6. The first ninety days mapped — From there the routine starts: month one for clean foundations, month two for the bookkeeping, credit control and payroll routines, month three for reporting you can use. By day ninety the finance function runs to an agreed timetable, with reports landing on the same date each month.

Where switches go wrong

Four failures account for most of the disruption people associate with changing accountant.

  • Waiting for accounts that never arrive — Owners often delay moving because the current accountant still holds an unfinished year. Months pass, the filing deadline gets closer, and nothing changes. If the work is already late, that is the argument for moving rather than against it. The incoming firm picks up the overdue year as part of the handover.
  • Leaving the registered office behind — Where the company’s registered office sits at the accountant’s address, it stays there until you change it at Companies House. Statutory post then arrives somewhere you no longer visit. Change the address before the relationship ends, not after the first missed letter turns up as a penalty notice.
  • Accepting opening balances without checking — A trial balance arrives and gets typed straight into the new system. Whatever was wrong last year is now wrong this year, with a fresh set of accounts built on top. Balances should be agreed back to bank statements, ledgers and filed returns before anything is reported from them.
  • Cutting access before the replacement exists — Removing the old agent’s authorisation the day you give notice leaves a gap. If a VAT return or an RTI submission falls due before the new authority is in place, someone is filing under pressure. Add the new authorisations first, then remove the old ones tax by tax.

When to hand the switch over

If you run a small company with no payroll, no VAT registration and a handful of transactions a month, you can manage a switch yourself. It is a letter, an authorisation approval and a folder of records.

It is worth handing over when any of the following apply:

  • You run payroll and a pension scheme, so the move has to land on a clean date.
  • You are VAT registered and the quarter end falls awkwardly against your year end.
  • Your last accounts are overdue, or you suspect the balances are wrong.
  • You already have an accountant and what you actually lack is monthly management information.

Ardein manages the whole handover, including professional clearance, records collection and a transition plan agreed around your year end, at no separate charge. Capacity is four new clients a month, so the timing is worth discussing early.

Questions people ask

Do I have to tell my old accountant why I am leaving?

No. The notice letter only needs to say that you are ending the engagement, from what date, and who is taking over. Reasons are optional. Most owners give a brief, neutral one because it keeps the handover cooperative, and cooperation is what gets your records released quickly.

Can I switch accountants in the middle of a VAT quarter?

You can, though it creates avoidable work. Splitting a quarter means two firms holding parts of the same return, and someone has to reconcile the join. Where the timing allows, move at the end of a VAT quarter and, if you run payroll, at a tax month end.

Will my old accountant charge me for the handover?

Some practices charge for time spent on clearance work or for copies of their internal working papers, which belong to them rather than to you. Your own records should be released without charge. Check your engagement letter for notice terms and how the final invoice is calculated before you write.

What happens to my HMRC agent authorisations when I switch?

Each tax is separate. A new authorisation request replaces the existing authority for that tax only, so VAT, Corporation Tax, Self Assessment and employer PAYE all need dealing with individually. Some use a digital handshake you approve yourself; others are managed in your business tax account under Manage account.

How long does switching accountants usually take from start to finish?

Identity checks and engagement take a few days. Clearance depends entirely on how quickly the other practice replies, which ranges from a couple of days to a few weeks. Records, HMRC authorisations and software access generally settle within two to four weeks of the notice letter going out.

Who is responsible for filings while the handover is in progress?

You are. As a director you remain responsible for the company’s filings whether or not an agent acts for you. That is why the sequence matters: get the incoming authorisations in place before removing the old ones, and make sure the disengagement letter lists every deadline still outstanding.

What to do next

Knowing how to switch accountants without the disruption comes down to sequence. Notice in writing, clearance requested, records listed in one go, authorisations added before the old ones are removed, and a date chosen around your year end rather than at random.

Done in that order, your part of the work is an afternoon. Done piecemeal, it is three months of chasing and a filing deadline you would rather not think about.

If what prompted the search was a decision you could not make because the numbers were too late, that is worth saying out loud when you speak to whoever takes over. The handover is the easy half. What matters is what arrives every month afterwards, and on what date.

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