The clearest signs you need a new accountant are missed deadlines, surprise penalties, no plan for Making Tax Digital, poor communication, fees that rise without explanation, and work that lands back on your desk. If two or more of these sound familiar, it is usually time to change.
A good accountant should save you more than they cost, in tax, in time and in the confidence that your filings are correct and on time. When that stops being true, the relationship is costing you money quietly. Below are the warning signs, a checklist you can run in ten minutes, a worked example of what one late filing really costs, and how to move firms without disruption. Every figure here was checked against gov.uk on 28 September 2026.
What are the warning signs you need a new accountant?
The warning signs fall into two groups: compliance failures that expose you to HMRC penalties, and service failures that waste your time and money. A single slip can be forgiven. A pattern, missed deadlines, unanswered emails, no proactive advice, means the firm has outgrown you or you have outgrown the firm.
| Healthy sign | Red flag it is time to leave |
|---|---|
| Deadlines filed early, with time to review | Filings that run to the wire or slip past the deadline |
| Plain-English answers within a day or two | Emails and calls that go unanswered for weeks |
| Proactive tax-saving suggestions each year | You only ever hear from them at the deadline |
| A clear, fixed fee you understand | Fees that creep up with no explanation |
| Ready for MTD and digital record-keeping | Still asking for a carrier bag of receipts |
| Named contact who knows your business | A different junior each time you call |
Are missed deadlines and penalties your accountant's fault?
If you gave your accountant your records in good time and they still filed late, the missed deadline is a service failure you should not accept. HMRC issues an automatic £100 penalty the moment a Self Assessment return is late, even if you owe no tax or are due a refund, so a late filing costs real money before any tax is due.
Who is liable for a late filing penalty?
The taxpayer is always legally liable to HMRC, not the accountant, which is exactly why a firm that files late is such a problem: you carry the penalty and the risk. According to gov.uk, once a return is three months late HMRC adds £10 a day for up to 90 days (a further £900), and at six months late it adds the higher of £300 or 5% of the tax due. A firm that treats the 31 January deadline as a target rather than a floor is putting your money at risk. See our guide to the Self Assessment late filing penalty for the full escalation.
Is your accountant ready for Making Tax Digital?
Making Tax Digital for Income Tax is no longer a future problem. It has been mandatory since 6 April 2026 for sole traders and landlords whose qualifying income was over £50,000 in 2024 to 2025, and the threshold falls to £30,000 in April 2027 and £20,000 in April 2028. An accountant with no MTD plan is a serious red flag.
MTD means keeping digital records and sending HMRC quarterly updates through compatible software, then a final declaration. Per gov.uk guidance, if you are in scope you cannot keep working from a spreadsheet emailed once a year. If your accountant has not spoken to you about MTD, compatible software or quarterly filing, they are behind, and you will be the one caught out.
What does poor communication from an accountant look like?
Poor communication is the most common reason business owners switch. It looks like unanswered emails, calls returned days later, jargon instead of plain answers, and finding out about a deadline from HMRC rather than your accountant. You should never feel like you are chasing the people you pay to look after your numbers.
Good accountants are proactive. They flag a tax saving before the year ends, warn you about a cash squeeze before it bites, and reply in language you understand. If every interaction feels one-sided, the relationship has already broken down.
Should you worry if fees keep creeping up?
Rising fees are only a red flag when the value does not rise with them. A price increase with more proactive advice and faster service can be worth paying. A quiet annual creep with the same slow service, or vague invoices you cannot map to actual work, means you are paying more for less.
Before you assume you are overpaying, benchmark the fee against the market. Our guide to how much an accountant costs in the UK sets out real 2026 fee ranges, and whether a limited company needs an accountant at all helps you decide what you actually need to pay for.
Are there signs specific to ecommerce and online sellers?
Yes. Online sellers have failure points a high-street accountant often misses: marketplace payouts that are never reconciled to gross sales, VAT on cross-border and digital sales handled wrongly, and no grip on the fees Amazon, eBay, Etsy or Shopify strip out before the money lands. If your accountant cannot read a marketplace settlement report, you have outgrown them.
The tell-tale sign is an accountant who books your Amazon or Shopify payout as turnover. That payout is net of platform fees, refunds and VAT, so booking it as sales understates both your revenue and your deductible costs, and it quietly distorts every number in your accounts. An ecommerce-literate firm reconciles the gross settlement, not the cash that arrives.
The 2026 small business checklist: do you need to switch?
Run this ten-point checklist. Score one point for each statement that is true of your current accountant. A score of three or more means it is worth getting a second opinion, and five or more usually means it is time to move.
The ten-point switch checklist
- A filing has been late, or run dangerously close to the deadline.
- You have received an HMRC penalty that was not your fault.
- Emails or calls regularly go unanswered for a week or more.
- You cannot get a straight answer without jargon.
- They have never suggested a way to save tax.
- There is no plan for Making Tax Digital.
- Fees have risen with no matching rise in service.
- You deal with a different, unfamiliar person each time.
- They do not understand your sector or your software.
- You feel anxious rather than reassured about your numbers.
If you are pulling your own figures together anyway, our small business tax preparation checklist shows what a well-run firm should be handling for you.
A worked example: what one missed deadline really costs
Take a sole trader whose accountant filed the 2024 to 2025 return four months late. The cost is not only the penalty. It is the penalty, the interest, and the hours spent untangling it, none of which buys any goodwill from HMRC.
- Automatic penalty: £100 the day after 31 January, whether or not tax is owed.
- Daily penalties: once three months late, £10 a day. One month into that window adds roughly £300.
- Running total after four months: about £400 in penalties alone, before any interest on unpaid tax.
On a return that a competent firm would have filed weeks early, that is £400 of pure waste. Repeat it once and the penalties alone can exceed a year's fee for a good accountant.
How do you switch accountants without disruption?
Switching is simpler than most owners fear. Your new accountant writes to the old one for professional clearance and your records, and you sign a 64-8 so HMRC recognises the new firm as your agent. You can move at any time in the year, and a well-run handover does not disrupt your filings or deadlines.
Our step-by-step guide to how to switch accountants in the UK walks through the whole process. If you want a firm that files early, understands ecommerce and prices work as a clear fixed fee, our tax advisory service and bookkeeping service are built exactly for that. You can book a free call to talk it through, no obligation.
Frequently asked questions
How do I know if my accountant is any good?
A good accountant files early, replies in plain English within a day or two, suggests tax savings before the year ends, and prices work as a clear fixed fee. If yours misses deadlines, goes quiet for weeks, only surfaces at the deadline, or cannot explain their invoices, those are reliable signs the relationship is not working.
Can I change accountant in the middle of the tax year?
Yes. You can switch accountants at any point in the year. Your new firm requests professional clearance and your records from the old one, and you sign a 64-8 so HMRC treats the new firm as your agent. A proper handover does not disrupt your deadlines, so there is no need to wait for the year end.
Is a late filing penalty my accountant's fault or mine?
Legally the penalty is always yours, because you are the taxpayer HMRC holds responsible, even when the accountant filed late. That is precisely why late filing is such a serious red flag. If you supplied your records in good time and the firm still missed the deadline, the service failure is theirs but the £100 penalty, and any daily penalties after three months, land on you.
What should I look for in an accountant for an online business?
Look for a firm that reconciles marketplace settlement reports rather than booking the payout as turnover, handles VAT on cross-border and digital sales correctly, and is ready for Making Tax Digital. An accountant who understands Amazon, eBay, Etsy or Shopify fee structures will give you accurate margins. One who does not will quietly understate both your sales and your costs.
