Self Assessment Library
Every guide, checklist, and walkthrough we've published to help you conquer your UK tax return.
HMRC Self Assessment Deadlines & Penalties 2026/27
Don't get hit with a £100 fine. See every critical date for registration, filing, and payment in the current UK tax year.
What Happens If You File Late? A Guide to HMRC Penalties and Mitigation
Missed the January 31st deadline? Discover what happens next, how much you'll be fined, and the specific steps you can take to stop the damage today.
What is a UTR Number? Your 10-Digit ID for HMRC Self Assessment
Everything you need to know about the Unique Taxpayer Reference (UTR) number in the UK. Learn what it is, where to find it, and why you need it for your tax return.
Allowable Expenses: Exactly What Can You Deduct to Lower Your Tax Bill?
Everything you need to know about HMRC-approved expenses for freelancers, sole traders, and side hustles. Learn how to legally lower your tax bill.
How to Register for Self Assessment: The Step-by-Step UK Guide
A plain-English walkthrough of the HMRC registration process. Learn exactly what you need, how long it takes, and how to get your 10-digit UTR number correctly.
Do I Actually Need to Register for Self Assessment UK Tax? (2026/27)
Take the 60-second test to find out if you need to tell HMRC about your income. Learn the thresholds for Vinted, Etsy, freelancing, and side hustles.
The £1,000 Trading Allowance: Your 'Free' UK Tax Pass
Everything you need to know about the UK's £1,000 Trading Allowance. Learn how to skip paying tax on your side hustle legally and when to claim it.
What is Self Assessment? The Beginner's Guide to UK Tax Filing
Everything you need to know about HMRC Self Assessment in plain English. Learn why it exists, who it's for, and how the process actually works.