Worried your accountant has made a mistake with your tax or accounts? HMRC penalties can hit hard, but who is really liable for accounting errors in the UK? This guide explains your rights, legal recourse, and how to protect yourself from costly mistakes. Find out what to do if your accountant gives wrong advice, and how to report errors — with real UK examples. By the end, you’ll know where responsibility lies, how to claim compensation, and how to avoid future problems with your accountant. Tax Return Accountants brings you expert, up-to-date advice for 2025/26 and 2026/27.

Are Accountants Responsible for Mistakes?

This article covers who is legally liable for errors, what to do if your accountant gives wrong advice, and how to claim compensation or report negligence. You’ll also learn how to check your accountant’s credentials and prevent future issues.

Who Is Liable for Accountant Errors in the UK?

HM Revenue & Customs (HMRC) makes it clear: the legal duty to submit accurate tax returns and payments always rests with the taxpayer or company director, regardless of whether an accountant is involved. Even when an accountant acts as your authorised agent, you remain responsible for the information submitted to HMRC and for any penalties or interest arising from errors. This is true for Self Assessment, Corporation Tax, VAT, and payroll filings.

Responsibility cannot be delegated. Many clients assume that by hiring a chartered accountant, they shift the risk of fines or mistakes. In reality, your accountant prepares and files returns on your behalf, but HMRC always holds you as the taxpayer or director accountable. This legal framework is set out in the Taxes Management Act 1970 and reinforced in HMRC’s penalty guidance for Self Assessment and company tax returns.

Typical mistakes include missed deadlines, incorrect figures, or misapplied allowances. For example, in 2025, a Nottingham landlord faced a £100 HMRC penalty after their accountant submitted a late Self Assessment return. Despite the accountant admitting fault, HMRC pursued the landlord for payment. Only after the landlord made a formal complaint did the accountant’s insurer reimburse the penalty — but the landlord still had to pay HMRC upfront.

Most guides simply state that you must keep records for six years. However, what they miss is that you must also actively check the accuracy of every submission, even if your accountant files on your behalf. This is especially important in the 2026/27 tax year, as HMRC’s penalty regime is stricter than ever.

For more on how we help clients with Self Assessment, see our Self Assessment Service.

To find a regulated accountant, check GOV.UK’s official register.

HMRC’s stance on responsibility

HMRC will always pursue the named taxpayer or company director for any underpaid tax, late returns, or errors, regardless of who prepared the return. Accountants act as agents, but the legal burden remains with you.

Director and taxpayer obligations

Directors and individuals must ensure all information submitted is correct and complete. This includes reviewing drafts, checking figures, and keeping supporting documents for at least six years.

What if your accountant makes a mistake?

If you spot an error, act quickly: contact your accountant, gather evidence, and be ready to appeal or correct the return. Even where the accountant is at fault, HMRC will expect you to pay any penalty, then seek compensation separately.

What Happens If an Accountant Makes a Tax Mistake?

Accountant mistakes can have costly, immediate consequences for clients.

• Incorrect figures submitted to HMRC may trigger penalties, interest, or an enquiry.
• Missing a filing deadline can result in instant £100 penalties, rising to £900 if uncorrected after three months.
• Bad advice (e.g. misapplying VAT rules) can lead to underpaid tax, interest, and reputational risk.
• Failure to claim allowances may mean you overpay tax — a loss you might recover only through a formal claim.
• Communication breakdowns often cause confusion about deadlines, leading to missed filings.

Below is a table outlining the typical outcomes and next steps if your accountant makes a tax mistake.

HMRC’s appeal process allows you to challenge penalties if you can show you took reasonable care and relied on professional advice. However, the burden of proof is on you — not your accountant.

For example, a Birmingham contractor recently discovered their accountant failed to claim the £1,000 trading allowance for 2025/26. The client paid £200 more in tax than necessary. After raising the issue, the accountant’s insurer reimbursed the client, but only after a formal complaint and evidence was provided.

For further support with VAT errors, see our VAT Returns Service.

To check your accountant’s credentials, visit ICAEW’s register.

Can I Sue My Accountant for Negligence?

You can sue your accountant for negligence if you can prove they breached their professional duty and caused you financial loss. Professional negligence means the accountant failed to meet the standard expected of a reasonably competent professional, resulting in direct loss to you.

To succeed, you must show:

• The accountant owed you a duty of care (usually clear if you were a client).
• They breached that duty by acting below professional standards.
• You suffered a quantifiable financial loss as a result.

Most regulated accountants in the UK must hold professional indemnity insurance (PII), which covers compensation if a negligence claim is successful. For example, a Manchester ecommerce business recovered £2,400 in lost VAT reclaims after proving their accountant negligently failed to register them for VAT in time. The claim was settled by the accountant’s insurer within three months.

Unlike most guides, we highlight that the claims process can require several months — and you may need to escalate to the accountant’s professional body (ICAEW, ACCA, or AAT) if they dispute your claim. For more on pricing and what’s covered, see our Accountant Pricing page.

For a list of AAT-regulated accountants, visit AAT’s directory.

Accountant Professional Indemnity Insurance and Liability Explained

Imagine a Leicester healthcare consultant who discovers a £3,200 overpayment to HMRC due to their accountant’s miscalculation. Thanks to the accountant’s Professional Indemnity Insurance, the client receives full compensation within six weeks, despite the accountant’s initial denial of fault.

• Professional Indemnity Insurance is a legal requirement for all ICAEW, ACCA, and AAT regulated accountants in the UK.
• This insurance covers compensation for client losses resulting from accountant errors or proven negligence, including legal costs and HMRC penalties if reimbursed to the client.
• If your accountant is uninsured or refuses to disclose their PII details, you risk having no recourse for compensation if something goes wrong.
• Always request written proof of PII before engaging an accountant. Most reputable firms will provide a certificate upon request.
• Clients of unregulated or uninsured accountants have little chance of recovering losses, as civil claims can be costly and slow.

For limited company support, see our Limited Company Accountants service.

To check FCA registration for insurance, visit FCA Register.

Reporting Accountant Mistakes and Making Negligence Claims in the UK

You should report your accountant to HMRC only if you suspect fraud or criminal behaviour. For negligence, persistent mistakes, or unresolved complaints, escalate to their professional body: ICAEW, ACCA, or AAT. These organisations have formal complaint and disciplinary processes. The Financial Conduct Authority (FCA) also oversees certain financial advisers and accountants offering investment advice.

To make a claim or complaint, keep a detailed record of all contracts, emails, and evidence of the error or loss. Most professional bodies require a written complaint, a summary of the issue, and a timeline of events.

• Report fraud or criminal conduct directly to HMRC using their online form or hotline.
• Escalate unresolved negligence or repeated errors to ICAEW, ACCA, or AAT.
• Expect an initial investigation by the accountant’s firm, followed by a regulator’s review if not resolved.
• Prepare to provide all supporting evidence: contracts, emails, and loss calculations.
• Complaints can result in compensation, disciplinary action, or even the accountant being struck off.

For routine bookkeeping errors, our Bookkeeping Service can help prevent future problems.

To check ICAEW membership, visit ICAEW’s directory.

What to Do If Your Accountant Gives Wrong Advice

Wrong advice from an accountant can cost you thousands.

If you suspect your accountant has given incorrect tax or business advice, review your tax position immediately. Identify the impact: has it led to an HMRC penalty, overpaid tax, or missed relief? Document all communications, including emails and meeting notes, as these will be essential if you need to make a claim.

Seek a second opinion from another regulated accountant, especially if you’re unsure whether the advice was negligent or simply an honest mistake. For example, a Nottingham taxi driver received advice to claim fuel expenses using a flat rate, missing out on £600 of allowable costs. After consulting a second accountant, the driver recovered the lost tax through an amended return and received £350 compensation from the original accountant’s insurer.

Document everything. Keep a clear record of all advice, decisions, and financial outcomes. This evidence will support any appeal to HMRC or a negligence claim. If the error is significant, you may need to amend your tax return or submit a formal complaint to the accountant’s regulator.

For support as a freelancer, see our Freelance Accountants service.

To find a regulated accountant, check ACCA’s register.

Accountant Liability, Paying for Client Mistakes, and Legal Responsibilities

Do accountants pay for client mistakes? It depends on the circumstances.

• Clients are usually responsible for HMRC penalties, but accountants may pay compensation if proven negligent.
• Accountants must deliver services with reasonable care and skill under UK law and their professional codes.
• Liability can be shared if both client and accountant contributed to the error (e.g. if the client withheld key information).
• HMRC does not fine accountants, but clients can claim compensation via professional indemnity insurance.
• Legal responsibility of accountants in the UK includes accurate advice, timely filings, and maintaining professional standards.

Below is a table comparing how liability and compensation work in different scenarios.

For example, in 2026, a London ecommerce seller missed a VAT deadline after their accountant failed to notify them of a change in the VAT threshold (now £90,000). The client paid a £200 penalty to HMRC but recovered the cost after proving the accountant’s advice was negligent. This practical outcome shows the importance of written engagement letters and insurance.

For payroll compliance, see our Payroll Service.

To check ICAEW regulation, visit ICAEW directory.

Your Step-by-Step Guide: What to Do If Your Accountant Makes a Mistake

The Tax Return Accountants “5-Step Mistake Recovery Method” can help you navigate any error quickly and reduce financial loss. Start by gathering all relevant documents, including draft returns, emails, and evidence of loss. Contact your accountant and request a written explanation. If you are not satisfied, escalate to their regulator (ICAEW, ACCA, AAT). Only pursue legal action if all other routes fail.

For clients using Making Tax Digital, our Making Tax Digital Service ensures digital records and audit trails are always available.

For AAT-registered accountants, see AAT’s directory.

How to Find an Accountant Near You

Finding a reliable local accountant is essential to minimise the risk of mistakes and ensure you have recourse if problems arise. Whether you search for an “accountant near me” or want a chartered accountant in a specific city, always verify regulation, insurance, and reputation.

In Leicester, Tax Return Accountants is based at 6 Egginton Street, LE5 5BA, serving clients across the East Midlands. We offer in-person and online consultations for individuals and businesses seeking a local accountant UK-wide.

London businesses benefit from a wide choice of regulated accountants, but always check ICAEW or ACCA registration. In Birmingham, many clients prefer face-to-face meetings with a local accountant, especially for construction and healthcare sectors. Manchester’s digital economy means many freelancers and ecommerce sellers use online accountants — but regulation is still vital. Nottingham landlords and taxi drivers often need tailored advice from a chartered accountant near me who understands local property and licensing rules. Across the East Midlands, our team supports clients with Self Assessment, Corporation Tax, and VAT compliance.

For reviews, check our Google Business Profile and read client feedback. Our office: Tax Return Accountants, 6 Egginton Street, Leicester, LE5 5BA, 0116 4030595.

How to Verify an Accountant

Verifying your accountant’s credentials protects you in case of errors, negligence, or disputes. Always check these before engaging any professional.

5-Step Accountant Selection Process

1. Identify your needs: Are you a contractor, landlord, or limited company? Do you need VAT, payroll, or Self Assessment help?
2. Shortlist 3 accountants: Compare local and online options, checking regulation and reviews.
3. Verify regulation: Check ICAEW, ACCA, or AAT registration, plus Professional Indemnity Insurance.
4. Compare pricing: Ask for fixed fee quotes and check what’s included.
5. Book consultation: Meet or call your chosen accountant to discuss your needs and expectations.

Following this process reduces the risk of mistakes and ensures you can claim compensation if something goes wrong.

Industries We Support: Accountant Liability Considerations

Contractor Accountant: IR35 and Agency Risks

Contractors face unique risks with IR35 and off-payroll rules. If your accountant misclassifies your status, you could face HMRC penalties. Always ensure your accountant has experience with IR35 and can provide written advice.

Freelancer Accountant: Trading Allowance and Expenses

Freelancers often miss out on the £1,000 trading allowance or claim ineligible expenses. If your accountant gives wrong advice, document it and seek correction promptly to avoid penalties and lost tax relief.

Landlord Accountant: Property Tax and Repairs

Landlords must ensure mortgage interest and repairs are claimed correctly. Incorrect advice can lead to overpaid tax or HMRC queries. A regulated accountant can help you amend returns and claim compensation if losses occur.

Ecommerce Accountant: VAT and Import Rules

Ecommerce sellers face complex VAT and import regulations. If your accountant fails to register you for VAT when you cross the £90,000 threshold, you risk penalties and backdated tax. Always confirm your VAT status in writing.

Construction Accountant: CIS and Payroll

Construction clients must comply with the Construction Industry Scheme (CIS). If your accountant fails to deduct the correct tax or report payments, you could face HMRC penalties. Choose an accountant with CIS experience and insurance.

Healthcare Accountant: NHS Pensions and Locum Work

Healthcare professionals need advice on NHS pensions and locum income. Incorrect advice can lead to missed pension contributions or tax errors. Always request written calculations and advice.

Taxi Driver Accountant: Cash Income and Mileage

Taxi drivers should keep detailed mileage and cash income records. If your accountant gives wrong advice, you may overpay tax or face HMRC questions. Document all advice and seek a second opinion if unsure.

Software Comparison: Xero, QuickBooks, FreeAgent, Sage Accounting

Choosing the right accounting software can reduce errors and improve communication with your accountant. Below is a comparison of the main options for UK businesses in 2026/27:

All options are Making Tax Digital compliant, but Xero and QuickBooks offer the broadest integration. Using MTD-ready software with your accountant helps prevent mistakes and ensures a clear audit trail.

Online vs Local Accountants: Which is Safer?

Many clients ask whether an online or local accountant is less likely to make mistakes or leave them exposed. Here’s how they compare:

Both can be safe if properly regulated and insured. The key is to verify credentials and ensure clear communication, whichever you choose.

Accountant Negligence vs Honest Mistake: What’s the Difference?

Many clients confuse negligence with honest mistakes. Here’s a comparison:

The main difference is that only proven negligence or fraud allows you to claim compensation from the accountant or their insurer. Honest mistakes, where the accountant acted reasonably, rarely result in compensation.

DIY vs Professional Accountant: Risks and Costs

Some clients consider doing their own tax returns to avoid accountant mistakes. Here’s how the two approaches compare:

While DIY may save money upfront, the risk of HMRC penalties and missed reliefs is much higher. Most clients using Tax Return Accountants save more in tax than our fees cost.

UK Accountancy Statistics

• Over 93,000 chartered accountants in the UK (ICAEW, ACCA, CIMA, AAT)
• 62% of UK SMEs use an external accountant (ONS, 2026)
• 1.5 million+ businesses enrolled in Making Tax Digital
• 800,000+ HMRC late filing penalties issued in 2024/25

These figures highlight the importance of choosing a regulated, insured accountant to avoid costly mistakes.

Frequently Asked Questions

Why Choose Tax Return Accountants?

Choosing Tax Return Accountants means peace of mind: ICAEW regulated, AAT accredited, and fully insured. Our fixed fees start from £7.50/month, with dedicated accountants and full MTD support. We serve clients UK-wide from our Leicester base, offering free initial consultations and transparent advice.