Quick answer
If you are filing Self Assessment for the first time, register with HMRC by 5 October after the tax year ends, wait for your UTR, collect your income and expense records, and file online by 31 January. Your first bill may include a payment on account.
Updated October 2026 · Figures based on 2025/26 rates
Filing your Self Assessment doesn’t have to be stressful. Let our qualified accountants handle everything — accurately and on time.
Step 1: register
Tell HMRC you need to file as soon as your income starts, for example when you start trading or receive rental income. You will receive a UTR by post.
Step 2: keep records
Record income and costs from day one. Even a simple spreadsheet with receipts is enough to begin with.
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Step 3: file and pay
Complete the return online, check the calculation and pay by 31 January. Set aside part of each payment you receive, around 20% to 30% of profit is a common starting point.
First-year surprises
Your first bill can include the previous year’s balance plus the first payment on account, which feels like paying twice. It is a timing effect rather than extra tax.
Don’t leave your tax return to the last minute. Avoid penalties, save time, and let an expert take care of it for you.
Frequently asked questions
Can an accountant do my first return?
Yes. A fixed-fee service means you know the cost before you start.
What if I started in the middle of the year?
You file for the tax year in which you started and report income from the start date.
Ready to file without the stress?
Fixed price from £199 + VAT. Done for you online by UK accountants.
Order online now See our Self Assessment registration service service
