Self Assessment Tax Return Service: Fixed-Fee, Filed Early
- We file your UK Self Assessment tax return for you — fully done-for-you, checked, and submitted to HMRC.
- Ideal for the self-employed, sole traders, landlords, company directors, and anyone with untaxed income.
- Simple fixed fee based on your situation — get an instant quote in under a minute.
- We find every allowable expense and relief, so you don't overpay — and we make sure you never miss a deadline or a £100 penalty.
- The 2025/26 tax year has ended, so you can file now and beat the January rush.
- Get started in minutes: instant quote, contact form, or WhatsApp.
Self Assessment doesn't have to mean late nights, HMRC login stress, or a last-minute January scramble. Hand it to us and it's simply handled: we gather what we need, prepare your return, find the reliefs you're entitled to, and file it with HMRC — accurately and on time. Here's exactly how it works.
Who needs to file a Self Assessment?
You almost certainly need to file a Self Assessment tax return if you're any of the following:
- Self-employed or a sole trader earning more than £1,000
- A landlord receiving rental income
- A company director with untaxed income
- Earning income from savings, dividends, or investments above your allowances
- Have capital gains to report, or foreign income
- A higher earner affected by the High Income Child Benefit Charge
- A side-hustler whose extra income has passed the £1,000 trading allowance
Not sure if you need to file? That's fine — tell us your situation and we'll confirm it, free.
What our Self Assessment service includes
- ✅ Full preparation of your Self Assessment tax return
- ✅ Expense & relief review — we claim everything you're entitled to, so you don't overpay
- ✅ Accurate tax calculation — you know exactly what you owe, with no surprises
- ✅ Filing directly with HMRC and confirmation once it's submitted
- ✅ Deadline reminders so a penalty is never even a risk
- ✅ A dedicated accountant you can actually talk to — no call centres
How much does it cost?
A simple, transparent fixed fee — no hourly billing and no surprise charges. Your exact price depends on your situation (for example, whether you're a sole trader, landlord, or have multiple income sources), so the fastest way to see your number is our instant quote tool.
See your price in under a minute — no obligation, no card details.
Get an Instant Quote →How it works — 3 simple steps
Key deadlines (and why to file now)
| Deadline | What it's for |
|---|---|
| 5 October | Register for Self Assessment (if it's your first time) |
| 31 October | Paper tax return deadline |
| 31 January | Online return + pay any tax due |
Miss the online deadline and HMRC charges an automatic £100 penalty — even if you owe nothing, and even if you're a day late. The 2025/26 tax year has already ended, so there's no reason to wait: file early, know your bill months in advance, and skip the January stampede entirely.
Why file with FincSol
- Fixed, transparent fees — you know the price before we start
- Maximised reliefs — we make sure you don't pay a penny more tax than you have to
- A real, dedicated accountant — not a chatbot or a queue
- Fast turnaround and clear, jargon-free updates
- We look after sole traders, freelancers, landlords, directors and e-commerce sellers every day
Frequently asked questions
How much does a Self Assessment tax return cost?
We charge a simple fixed fee that depends on your situation — sole trader, landlord, multiple income sources, and so on. Use our instant quote tool to see your exact price in under a minute, with no obligation.
Can you file for previous years too?
Yes. If you've missed a year or need to catch up on late returns, we can prepare and file them and help sort out any penalties — get in touch and we'll review your position.
What information do you need from me?
Just your income and expense details for the tax year — we give you a simple, clear checklist so nothing is missed. You don't need to understand the tax rules; that's our job.
Is it too early to file my 2025/26 return?
No — the 2025/26 tax year ended on 5 April 2026, so you can file now. Filing early means you know your tax bill months ahead and avoid the January rush entirely.
Do you handle payments on account too?
Yes. We calculate any payments on account, explain what's due and when, and can apply to reduce them if your income has fallen — so you're never caught out.
Fixed fee, filed early, zero stress. Pick whichever is easiest — an instant quote, the contact form, or a quick WhatsApp message — and we'll take it from there.
Related reading: your second payment on account explained and what happens if you file late. Official HMRC guidance is at gov.uk.
