Most owners delay switching because they fear disruption, penalties, or awkward conflict with the old firm. The reality: the process is structured, reversible, and much simpler than you think when handled properly, and you’re always free to choose your accountant (professional rules explicitly recognise changes in appointment). ICAEW
Key facts (so you can breathe)
- You can remove an existing tax agent yourself and new authorisations replace old ones. The method varies by tax (online, API, or Form 64-8). GOV.UK
- VAT and certain services use HMRC’s digital handshake, your new accountant sends a secure authorisation link. Never share your own credentials. GOV.UK
- Need to file at Companies House? You can request or refresh your company authentication code securely (posted to your registered office or, if eligible, to a director’s home). GOV.UK
- Under UK GDPR, you have a right to data portability for your personal data (often as CSV). ICO
- Routine deadlines continue as normal during a switch: PAYE is due by the 22nd (electronic), and VAT returns/payment are usually one month + 7 days after your period end. GOV.UK
Jump to what you need:
Worried about cost? → How much it really costs to change accountants
Nervous about the handover? → Switching checklist: week-by-week
Wondering what “good” feels like? → Old vs new: your first 90 days, side-by-side
Don’t want to choose wrong again? → How to evaluate accountants (reviews, red flags, questions)
Looking for the top traits? → Best-in-class accountants for growing service businesses
Why owners actually switch (and how to spot it early)
If any of these feel familiar, you’re not alone:
- You chase them for replies and only hear back at deadline time.
- Surprise bills for things you assumed were included.
- Errors or penalties (missed VAT/PAYE filings, late accounts).
- Practice acquisition changed your portal, team and fees, service slipped.
- You’ve outgrown compliance-only support and want forecasting, board-level MI, and proactive tax planning.
If you’re nodding to two or more, read 7 warning signs it’s time to change your accountant next.
The UK switching process, simple, structured, safe
Switching works because professional standards are designed for continuity. Here’s the plain-English version.
1) Discovery & acceptance
We confirm fit, scope, timeline, and complete AML/KYC checks before we accept. Professional guidance recognises changes of professional appointment as routine, with specific procedures for both firms. ICAEW
2) Professional enquiry (“clearance”)
We write to your previous accountant to ask if there are any ethical reasons not to accept, and to request reasonable transfer information so we can continue your affairs seamlessly. (It’s not “permission to act”, it’s an enquiry.) ICAEW
3) Engagement letter & privacy
You’ll see a clear scope, responsibilities and pricing before we start. For your data, UK GDPR includes a right to data portability for personal data (often delivered in machine-readable formats like CSV). ICO
4) HMRC agent authorisations (per tax)
We request authorisation for Self Assessment, Corporation Tax, PAYE, VAT, CIS, etc. New authority replaces old, and you can remove an old agent yourself at any time. Some services (notably VAT) use the digital handshake: we send a secure link; you approve. GOV.UK
5) Data & systems handover
We collect the trial balance, journals, fixed-asset register, VAT workings, payroll YTD/RTI, CIS records, year-end papers, and software access (Xero/QuickBooks). If Companies House access was managed by your old firm, we’ll help you request your authentication code directly. GOV.UK
6) Stabilise (weeks 2–12)
We reconcile opening balances, lock in your month-end calendar (PAYE/VAT), implement a 52-week rolling forecast, and agree a review rhythm so deadlines don’t slip. PAYE remains due by the 22nd; VAT returns/payment usually one month + 7 days post-period. GOV.UK
Next read: Switching checklist: week-by-week (includes who does what, when).
Costs (and why “free onboarding” often costs more later)
What’s included: AML/KYC, agent setup, carrying forward balances, importing software data, and building your opening reconciliation.
When clean-up is chargeable: missing records, unreconciled banks, historic corrections, or re-doing prior VAT/PAYE submissions.
The payoff: a fixed review cadence + 52-week forecast reduces penalty risk and improves cash decisions. (PAYE/VAT have hard deadlines, avoid interest and late-payment penalties by getting the calendar right.) GOV.UK
Next read: How much does it cost to change accountants?
Risks you’re worried about, and how we control them
- “Will we miss deadlines during the switch?”
No, because we set your calendar on day 1 and keep PAYE/VAT dates front and centre (PAYE 22nd, VAT one month + 7 days). GOV.UK - “What if the old firm won’t hand things over?”
Professional rules require the old firm to provide reasonable transfer information promptly and free of charge (e.g., last approved accounts + detailed TB). Outstanding fees don’t justify ignoring a professional enquiry. ACCA Global - “Is it safe to share logins?”
Never share your credentials. HMRC’s digital handshake and formal agent authorisations are the correct, auditable route. GOV.UK - “What about Companies House access?”
Use the official service to request your authentication code (posted to your registered office or eligible home address). GOV.UK
Next read: Switching when things are messy: late filings & clean-ups.
What “good” looks like in your first 90 days (versus your old experience)
- Response times that calm your inbox: same-day/next-day replies; scheduled reviews.
- Live bookkeeping + reconciliations: clean bank feeds, evidence attached, real-time dashboards.
- Deadlines locked: PAYE calendar and VAT quarters set; reminders scheduled. GOV.UK
- 52-week rolling forecast: payroll, VAT, CT, and debtors all visible 4–6 weeks ahead.
Next read: Old vs new: your first 90 days, side-by-side and Best-in-class accountants for growing service businesses.
FAQs
Do I need to tell HMRC I changed accountants?
Your new accountant requests agent authorisation; you can also remove an old agent in your HMRC account. New authority replaces old. GOV.UK
Is VAT different?
Yes, many VAT services use a digital handshake authorisation link sent by your agent (via the Agent Services Account). GOV.UK
What if my old accountant won’t hand over data?
They should provide reasonable transfer information to ensure continuity (e.g., last approved accounts + detailed TB), and respond to professional enquiries even if fees are outstanding. ACCA Global
Can I get copies of “my data”?
Under UK GDPR, you have a right to data portability for personal data (often provided in machine-readable formats like CSV). ICO
Will deadlines be missed during the switch?
No, with proper onboarding, your PAYE (22nd) and VAT (one month + 7 days) schedules continue as normal. GOV.UK
What about Companies House?
Request or refresh your authentication code via the official service; it’s posted to your registered office (or eligible home address service). GOV.UK