There's a common misconception that switching accountants can only happen neatly at the start of a new financial year. In reality, business owners in London switch tax accountants throughout the year for all sorts of reasons, poor communication, outgrowing a smaller firm, needing more specialist advice, or simply wanting a fresh perspective, and mid-year switches happen smoothly far more often than people expect. If you're considering a change but worried about the timing, here's what the process actually involves from start to finish.
Why Mid-Year Switches Are More Common Than You'd Think
Business needs don't align conveniently with the tax calendar, and neither does dissatisfaction with an existing accountant. Growth, a change in ownership structure, an unresolved communication issue, or simply the realisation that your current advisor isn't proactive enough are all reasons that can surface at any point in the year. Waiting for an arbitrary "better" moment often means tolerating a relationship that isn't serving your business for months longer than necessary, when the switch itself is far less disruptive than most owners assume it will be.
Understanding the Professional Clearance Process
When you appoint a new accountant, they're professionally obliged to contact your outgoing accountant to request what's known as professional clearance, essentially a formal handover of relevant information and confirmation there's no reason they shouldn't take you on. This process is standard practice across the profession and typically happens without you needing to manage it directly, your new accountant handles the correspondence, and your old accountant is professionally required to respond in a reasonable timeframe once contacted.
What Information Actually Needs to Transfer
A smooth handover depends on your new accountant receiving the right information from the outset. This typically includes your accounting records to date, details of any ongoing HMRC correspondence or enquiries, copies of previously filed returns, and your current tax reference numbers. Most of this is transferred directly between the two firms, though it's worth requesting your own copies of key documents for your records regardless, simply as good practice going forward.
- Access to your accounting software or a copy of underlying records
- Copies of the last two to three years of filed tax returns
- Details of any open HMRC enquiries or correspondence
- Payroll records if applicable, including year-to-date figures
- Companies House and HMRC authentication codes or agent authorisations
Choosing the Right Timing Within the Tax Year
While a switch can genuinely happen at any point, some timing is smoother than others. Switching shortly after a major deadline, such as just after your VAT quarter or annual accounts filing, tends to minimise disruption, since there's no return actively in progress that could get lost in the handover. If a deadline is imminent, it's often sensible to have your new accountant confirm they can meet it comfortably before finalising the switch date, or to agree that your outgoing accountant completes that one specific filing first before the handover happens. There's no strict rule requiring you to wait, but a little planning around timing removes one of the few genuine sources of risk in an otherwise straightforward process. Most experienced firms have handled dozens of mid-year handovers before and will have a clear, well-rehearsed process for exactly this kind of situation, so it's worth asking directly how they typically manage an in-flight deadline during a changeover. A confident, specific answer to this question is usually a good early sign that you're dealing with a firm genuinely experienced in onboarding new clients smoothly, rather than one that will be figuring it out for the first time alongside you. A firm that has genuinely done this many times before will also be able to give you a realistic timeline for the whole process, rather than a vague estimate that leaves you guessing, and that clarity alone can make the whole decision to switch feel far less daunting than it first seemed. Most business owners who go through the process report that their only real regret is not making the change sooner, once they see firsthand how manageable it actually turned out to be, and how quickly the anxiety around the switch faded once it was genuinely under way.
Avoiding Gaps in Compliance During the Transition
The main risk during any mid-year switch isn't the switch itself, it's a deadline falling into the gap between two firms, with each assuming the other is handling it. Clear written confirmation of exactly who is responsible for what, and by when, closes this gap completely. A good new accountant will proactively map out every upcoming deadline as part of onboarding, precisely to avoid this kind of ambiguity slipping through unnoticed during the transition period.
What to Look for in Your New Accountant
When choosing who to switch to, look beyond price alone. Ask about their typical response times, how they structure ongoing communication, and whether they offer genuinely comprehensive bookkeeping and accounting services rather than just annual compliance work. A firm that understands your business day-to-day, rather than only appearing at filing time, tends to add far more value across the year, which is often the entire point of switching in the first place.
Setting Up for a Strong Start With Your New Accountant
Once the switch is complete, invest a little time in a proper onboarding conversation, walking through your business, your goals, and any specific concerns that prompted the change. This upfront investment pays off quickly, since a new accountant who genuinely understands your circumstances from day one will spot opportunities and risks far faster than one working purely from historic records alone, without that direct context. Many firms offering established bookkeeping and accounting services use this first meeting to agree a clear plan for the remainder of the year, including exactly who is doing what and by when, so nothing falls through the cracks during the changeover.
It's also a good moment to reset expectations around communication, reporting frequency and how you'll be kept informed of upcoming deadlines going forward. If poor communication was part of what prompted the switch in the first place, being explicit about what good looks like from day one gives the new relationship the best possible chance of avoiding the same frustrations further down the line.
Finally, it's worth scheduling a short follow-up review a few months after the switch, simply to check that everything is working as expected and that nothing from the handover slipped through unnoticed. Most issues that do arise after a switch surface within the first quarter, so catching them early, while the transition is still fresh in everyone's mind, makes them considerably easier to resolve than discovering a gap much later in the year. This kind of check-in also gives you an early, honest read on whether the new relationship is delivering on what was promised, well before a full year has passed and you're facing the same decision about switching all over again.
The Bottom Line
Switching tax accountants mid-year is far more straightforward than most business owners expect, and there's rarely a compelling reason to wait for an arbitrary calendar milestone if your current relationship isn't working. With clear communication, proper professional clearance, and careful attention to upcoming deadlines, the transition can happen smoothly at almost any point in the year.
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Fred Michael & Co Ltd helps London business owners fix accounting problems and switch providers smoothly, with clear, practical support.