Knowledge Hub
Authoritative guides on HMRC late filing penalties, Self Assessment obligations, and specialist tax advice. Every article reviewed by a qualified, practising accountant.
Penalties & Deadlines
You just missed a deadline or got your first fine. Here's exactly what HMRC charges and when.
The HMRC Penalty Escalator: Exactly What You Owe for a Late Self Assessment
A brutal, clear breakdown of every HMRC late Self Assessment penalty — from the £100 automatic fine on day one through to 12-month surcharges and enforcement risk. Know exactly what you owe right now.
Missed the Corporation Tax Deadline? Company Penalties Explained
A late company tax return triggers a double-whammy: HMRC penalties on your CT600 and Companies House fines on your accounts. Ignore both long enough and your company gets struck off. Here is the full picture.
Appeals & Excuses
You're late but want to fight the penalty. Here's what qualifies, what doesn't, and how to appeal.
What Counts as a "Reasonable Excuse" to Appeal an HMRC Penalty?
HMRC will cancel a late filing penalty if you had a genuine "reasonable excuse" — but they reject thousands of DIY appeals because the framing is wrong, the evidence is missing, or the excuse simply doesn't qualify. Here is exactly what works and what doesn't.
How to Appeal a £100 Late Filing Penalty (Step-by-Step)
Got a £100 HMRC penalty letter? You can appeal it — but only after you have filed the return, and only within 30 days. Here is the exact step-by-step process, including what the SA370 form actually asks.
Years Behind
You haven't filed in years. Here's how to come forward voluntarily — and what happens if you don't.
Years Behind on Your Tax Returns? Here's How to Come Clean to HMRC
If you haven't filed for three, five, or ten years, the most important thing to know is this: coming forward voluntarily always results in significantly lower penalties than being discovered. Here's the practical path forward — including HMRC's disclosure campaigns for landlords.
What Happens When HMRC Sends a Debt Collection Agency?
If HMRC has passed your debt to a collection agency — or if you've had a "field force" visit — here's exactly what they can and cannot do, and how a Time to Pay arrangement with HMRC stops the process cold.
Ready to Sort Your Late Tax Returns?
Reading the guides is a good start. Speaking to a specialist is a better one. Free assessment — no obligation.