How to Switch Accountants Mid Tax Year: A Step-by-Step UK Guide

Switching accountants feels bigger than it is. Here's what actually happens, step by step, and how to do it without missing a deadline.

If you're unhappy with your current accountant, you're not stuck with them until the end of the tax year. You can switch at any point — mid tax year, mid financial year, even a few weeks before a deadline if you handle it properly. The process is more straightforward than most people expect, and HMRC has no rule requiring you to stay with the same accountant for any minimum period.

That said, switching does need to be done in the right order. Do it badly and you risk gaps in your records, missed deadlines, or paying twice for the same work. Do it properly and the whole thing can be finished in a couple of weeks with no disruption to your filings.

Signs it's time to switch

People usually don't leave an accountant over one bad moment — it's a pattern. The most common reasons include:

None of these need to be dramatic. "I want better value and faster communication" is a perfectly good reason on its own.

Step 1: Check your engagement letter

Before you do anything else, look for the engagement letter or terms of service your current accountant sent you when you first signed up. This will tell you:

Most accountants don't lock clients into long minimum terms, but it's worth the five minutes to check rather than assume.

Step 2: Don't cancel anything yet — find your new accountant first

A common mistake is resigning from the old accountant before the new one is confirmed and ready. This creates a gap where nobody is technically responsible for your affairs, which is exactly when things get missed. Line up your new accountant first, confirm they're happy to take you on, and agree a start date before you tell your current accountant you're leaving.

Step 3: Request professional clearance

This is the formal part of switching, and it's handled between the two accountants, not by you directly. Your new accountant will write to your old one requesting "professional clearance" — essentially asking whether there's any professional reason they shouldn't take you on (unpaid fees, ongoing disputes, etc.). This is standard practice across the industry and is required by the accounting professional bodies (ICAEW, ACCA, CIMA). It's not something to be nervous about — it happens every day and your old accountant is professionally obligated to respond promptly and honestly.

Step 4: Handover of records

Once clearance is given, your old accountant should hand over:

If your old accountant is dragging their feet on handover, professional clearance rules mean they can't simply refuse to cooperate — though in practice, being polite and giving a reasonable deadline gets things moving faster than escalating immediately.

Step 5: Update HMRC authorisation

Your new accountant needs to be authorised to act on your behalf with HMRC. This is done through HMRC's agent authorisation process — either digitally through your Government Gateway account or via a paper 64-8 form. Your new accountant will normally handle the paperwork and just need you to approve the authorisation request when it lands in your HMRC online account. Your old accountant's authorisation should be removed at the same time so there's no confusion later about who's acting for you.

What if you're switching close to a deadline?

This is the scenario people worry about most, and it's manageable if you're upfront about it. If your Self Assessment deadline (31 January) or company accounts deadline is close, tell your new accountant immediately — most fixed-fee accountants are used to picking up urgent handovers and will prioritise getting your return filed on time over doing an unhurried, leisurely handover. What matters most in this situation is getting your records and prior-year figures across quickly; the polished handover process can happen after the deadline is safely met.

Will switching cost you anything extra?

Usually not, beyond your normal fees to the new accountant. Reasonable accountants don't charge for professional clearance correspondence — it's considered standard practice. Where costs sometimes come in is if your old accountant genuinely needs to do extra work to prepare a handover file (for example, if your bookkeeping was in a mess and needs tidying before it can be passed on) — but this should be communicated clearly, not sprung on you as a surprise invoice.

Common myths about switching accountants

"I have to wait until the end of the tax year." Not true. You can switch at any point in the year — the tax year itself doesn't reset your accountant relationship.

"My old accountant can refuse to hand over my records." Also not true. Your financial records belong to you. Working papers created by the accountant themselves are technically theirs, but they're expected to release them as part of a normal handover under professional clearance rules.

"Switching will trigger an HMRC investigation." No — HMRC has no reason to flag a routine change of agent. Thousands of businesses and individuals change accountants every year without any issue.

How long does the whole process take?

For most straightforward cases — an individual or small business with reasonably tidy records — switching typically takes one to three weeks from first contacting a new accountant to full handover being complete. It can move faster if both accountants respond promptly, or slower if your old accountant is unresponsive.

Frequently asked questions