If your accountancy firm has just been acquired (or PE-backed), what actually changes for you, and what should you do in the next 30 days to avoid missed deadlines, fee shocks or lost data?
UK accountancy is consolidating fast: many mid-tier firms now have private-equity backing and M&A is accelerating, which often reshuffles teams, portals and pricing. That shift is visible in recent UK market coverage and rankings, and in flagship deals (e.g., investments backing Azets and Xeinadin). barings.com
Key facts (UK 2025/26)
- You can change accountants at any time. Professional bodies set expectations for “change of professional appointment” and clearance between firms. ICAEW
- You control agent access. You can remove or change your tax agent for each tax in your HMRC account. GOV.UK
- You can get your data out. UK GDPR includes a right to data portability for your personal data (often machine-readable exports). Information Commissioner’s Office
- Companies House access is yours. Your company authentication code (and, where used, ACSP arrangements) determine who can file—keep these under your control. GOV.UK
What usually changes after an acquisition (and why it matters)
People & priorities. Your day-to-day contact may move, and your account might be re-segmented inside a bigger portfolio, sometimes with fee re-rating.
Systems & portals. Firms standardise onto one stack; migrations can slow turnaround if not planned.
Engagement terms. New letters may tweak scope, liability caps, notice periods or billing cadence.
Service model. Centralised helpdesks replace direct partner access; “upsell” paths appear (advisory, sector pods).
These shifts are common in roll-ups and PE-backed integrations: they bring scale and new services, but the first 3–6 months can be bumpy for clients if change is not tightly managed. Accountancy Age
What “good” looks like:
- Clear re-onboarding plan; unchanged deadlines; named relationship lead + deputy
- Parallel-run portal migrations; tested backups/exports; response-time SLAs
- Transparent fee position (grandfathered for a period or clearly staged)
Should you stay or switch? Use this quick diagnostic
Stay (for now) if:
- You’ve met your new delivery team and they’ve shown a written transition plan and SLAs.
- Fees are transparent and reasonable (or grandfathered for at least one cycle).
- You’ve tested portal access and can see historic records intact.
Switch sooner if:
- Deadlines slip, or you lose named contacts.
- Fees jump without scope change or notice.
- You can’t get timely exports of your data or working papers. (Remember: portability rights apply to personal data; commercial records are typically provided under professional clearance norms.) Information Commissioner’s Office
Related Guides:
- Switching Accountant: 14-Point Checklist (UK)
- DIY Bookkeeping Checklist (helps you gather records fast)
- Payroll Outsourcing Costs (sense-check any “new payroll bundle” you’re offered)
- Bookkeeping Outsourcing Costs (sense-check any “new bookkeeping bundle” you’re offered)
- Cashflow Forecasting Services (keep a live 52-week view through any transition)
Your 30-day, no-drama switch plan (even if you hope to stay)
| Week | Action | Why it matters |
|---|---|---|
| 0–1 | Ask for the acquisition transition deck: who’s your partner/manager, what’s changing, what’s the migration timeline? | Tests readiness and gives you names, dates, SLAs. |
| 0–1 | Snapshot your access: download current VAT/PAYE, CT, accounts packs; export bookkeeping ledgers, bank recs, payroll YTD. | Creates a baseline if systems change. (Data portability covers personal data; business records usually flow via clearance.) Information Commissioner’s Office |
| 1–2 | Protect your filing keys: confirm your Companies House authentication code is on file and under your control. GOV.UK | Prevents filing lock-out during portal or ACSP changes. GOV.UK |
| 1–2 | Agent access check: in your HMRC business tax account, review and (if needed) remove or replace authorisations tax-by-tax. GOV.UK | Ensures only the right firm can file or view data. |
| 2–3 | Professional clearance: if switching, instruct new firm to request clearance; respond quickly to info lists. ICAEW | Smooth handover; reduces duplicated queries. |
| 3–4 | Parallel run: for the next payroll/VAT return, run a light “shadow” check with your new team. | Catches mapping or settings issues before they bite. |
Copy-paste: professional clearance email (client to outgoing firm)
Subject: Professional clearance & records for [Your Company Ltd]
Hi [Name],
We’ve appointed Heights Accountancy as our new accountants with immediate effect. They will be in touch shortly to request professional clearance and arrange the transfer of records in line with professional guidance on changes of appointment.To help them pick things up smoothly, please expect them to request the following items (non-exhaustive):
- Latest signed statutory accounts and CT600 with computations and iXBRL
- Trial balance and year-end working papers
- VAT returns (last 4–8 quarters) with workings and reconciliations
- PAYE payroll data (current year YTD FPS/EPS, prior year P60/P45/P11D as relevant) and payroll journals
- Bookkeeping data exports (general ledger, bank recs, aged receivables/payables, fixed asset register)
- Open queries, upcoming deadlines, and any engagement/recurring task notes
Where personal data is included, a machine-readable export (e.g., CSV, PDF packs for signed sets) is perfect.
Many thanks for your cooperation. Please let me know if you need anything from our side.
Kind regards,
[Your Name]
[Role], [Your Company Ltd]
[Email] · [Phone]
Pricing & scope: what to challenge after a buy-out
- “Standardisation” uplifts: ask for a side-by-side of old vs new scope and rates; request grandfathering for a period.
- Bundled add-ons: sense-check payroll, CIS or management pack add-ons using your Payroll Outsourcing Costs and Bookkeeping Outsourcing Costs guides.
- Notice periods & liability caps: compare the old and new engagement letters line-by-line; query unilateral changes. (ICAEW guidance assumes ethical conduct on changes of appointment.) ICAEW
Frequently asked questions
Do I have to switch if a PE investor buys “my” firm?
No. Many acquisitions are well-run and bring better resources. Judge the firm by delivery, not ownership. The moment service dips or fees change without clarity, follow the 30-day plan and prepare a managed switch. Accountancy Age
Can I keep my HMRC agent the same while I decide?
Yes, agent authorisations are yours to manage and you can remove or replace them online, tax-by-tax. GOV.UK
What records am I entitled to when I leave?
Your new accountant requests professional clearance and the working information needed to continue the engagement; you can also exercise data portability rights for personal data exports. ICAEW
How long must my old accountant legally keep my records?
UK firms are generally required to retain client records for at least six years after the end of the accounting period to which they relate, longer in some cases (for example, where transactions involve capital gains, property, or potential tax enquiries).
Under Money Laundering Regulations 2017, accountants must keep identification and due-diligence evidence for five years from the end of the business relationship.
Our Companies House filings were done via our old agent, what now?
Retain your company authentication code and ensure it isn’t only within the outgoing firm’s software. If your filings went through an authorised ACSP, confirm who will act going forward. GOV.UK
Will the regulator or HMRC tell me if my firm is acquired?
Not typically. Treat any acquisition email as a trigger to check team, access and deadlines immediately.
Related Guides (to keep momentum)
- Switching Accountant: 14-Point Checklist (UK) – step-by-step, client-side
- Bookkeeping Outsourcing Costs (UK 2025/26) – avoid hidden fees during re-pricing
- Payroll Outsourcing Costs (UK 2025/26) – what’s included (and what’s not)
- Cashflow Forecasting Services – keep a live 52-week forecast through any change
What to do next
Worried your firm’s been bought and standards are slipping?
Book a 20-minute planning call. We’ll review your risks, map a 30-day switch (or stabilisation) plan, and keep VAT, payroll and year-end on track.