About Tax Investigation Cost

What is on this site

One question, "tax investigation", answered with a quote form that works on the page with no account, 5 guides on the questions around it, a data table you can cite (the figures and their method), and the sources every figure rests on.

• How long does a tax investigation take?: Aspect enquiries often close in weeks to a few months; full HMRC enquiries commonly run months to a year or more. What sets the pace and how to shorten it.
• What triggers a tax investigation? The boring truth: Most HMRC enquiries start from data-matching, unusual figures against benchmarks, or plain randomness. What actually draws attention and what genuinely doesn't.
• Tax investigation insurance: what fee protection actually covers: Fee protection insurance covers the professional fees of handling an HMRC enquiry, not the tax itself. It's often bundled with accountancy packages; check before buying.
• Code of Practice 9: the serious end, explained without drama: COP9 is HMRC's procedure where serious tax fraud is suspected, offering the Contractual Disclosure Facility. What COP9 and COP8 mean and why specialists matter here.
• Tax investigation fees: what representation costs in 2026: HMRC enquiry representation fees: £500–£1,500 for aspect enquiries, £1,500–£5,000+ for full enquiries, more for COP9 (typical 2026 quotes). How advisers charge.

Reach us

Contact for a question about the site, or enquiries@taxinvestigationcost.co.uk. The legal terms are on Terms and Privacy.

Tax Investigation Cost is a free introduction service operated by Ellul Solutions Ltd; we pass your details to relevant tax investigation specialists who contact you directly. We may receive a fee from providers; you pay nothing and are under no obligation. We are not accountants, tax advisers or solicitors and nothing here is tax or legal advice; fee figures are typical 2026 quote ranges that vary by complexity, and penalty outcomes depend on the facts of each case.