Self-Assessment Services

Your Tax Return. Done. Correct. On Time. Every Year.

Self-Assessment is one of the most stressful things HMRC asks individuals to do. The form is confusing, the rules change every year, and the penalties for getting it wrong are real.
At Oasis Accountants, we do your Self-Assessment for you. We gather what we need, calculate exactly what you owe - and exactly what you can claim back - and file it with HMRC. Correctly. On time. Every single year.
We also tell you if you are paying too much tax. Because most people who do their own returns miss out on deductions and reliefs they are entitled to — and end up overpaying without knowing.

Call For a Free Quote

020 3818 9530

Or Send a Message

Self-Assessment returns filed for freelancers, contractors, landlords, and professionals across London. Not one penalty. Not one late submission.

What We Do for You

Collect and organise all your income information

Calculate your tax - including all allowable expenses and deductions

Identify reliefs and allowances you might have missed

Prepare and file your SA return with HMRC

Handle any HMRC queries or correspondence that follow

Keep you informed of the timeline and what to expect

People We Help



Self-employed individuals and sole traders



Freelancers and contractors - including IR35 considerations



Landlords with rental income



People with investments, dividends, or capital gains



Anyone who has been asked by HMRC to file - for any reason

How It Works

Step 1

You send us your details

Income, expenses, receipts - in whatever format you have them. We sort them out.

Step 2

We calculate your tax

Accurately — including every deduction and relief you are entitled to.

Step 3

We file with HMRC

On time. Correctly. You get confirmation that it is done.

Step 4

We keep you informed

If HMRC get in touch, we deal with it. You just get on with your life.

FAQ

When is the Self-Assessment deadline?

31 January following the end of the tax year. So for the 2024/25 tax year, the deadline is 31 January 2026. We file well ahead of this.

What if I have not filed for years?

It happens - and it is more common than you think. We help you get up to date, calculate what is owed, and file everything correctly. Often the situation is less bad than people fear.

How much does Self-Assessment cost?

We offer fixed-price returns - no surprises. The price depends on how complex your tax situation is. Book a free call and we will tell you exactly.