Self Assessment for First-Time Filers: A Beginner’s Guide
New to Self Assessment? Learn how to register, what to report, key deadlines and how to avoid first-year mistakes.
October 15, 2026
What to Do If HMRC Opens an Enquiry Into Your Tax Return
Received an HMRC enquiry letter? Learn why HMRC checks returns, what to do, your deadlines and how an accountant can help.
Self Assessment Checklist: What You Need Before You File
A simple Self Assessment checklist covering your UTR, income records, expenses, bank details and other documents you need before filing.
What Is an SA302 Tax Calculation and How Do You Get One?
An SA302 shows your income and tax for a year. Learn how to get your SA302 and tax year overview and why mortgage lenders ask for them.
How to Claim a Self Assessment Tax Refund
Overpaid tax? Learn how to claim a Self Assessment refund, how long HMRC takes and common reasons a return shows a rebate.
Self Assessment Tax Year Dates 2025/26
Key Self Assessment dates for the 2025/26 tax year: registration, paper and online filing, payment and payments on account deadlines.
How to Amend a Self Assessment Tax Return
Made a mistake on your return? Learn how to amend a Self Assessment tax return online, the 12-month deadline, and what happens to your tax bill.
Self Assessment Payments on Account Explained
Payments on account explained: who pays them, how they are calculated, when they are due and how to reduce them if your income falls.
How to Get a UTR Number for Self Assessment
How to get a UTR number: register for Self Assessment online, wait for the letter, activate your account, and what to do if you lose it.
What Happens If You Miss the Self Assessment Deadline?
Missed the Self Assessment deadline? See the HMRC late filing and late payment penalties, how interest works, and what to do next.
