Self Assessment tax returns
Whether you're self-employed, a company director, a landlord or just have income HMRC wants to know about, we prepare and file your Self Assessment accurately - and make sure you never pay more than you owe.
The Self Assessment deadline (31 January) has a way of creeping up. Get it wrong or file late and HMRC hits you with a £100 penalty straight away, then daily charges after three months.
TaxMag takes the stress out of it completely. We gather your income and expenses, claim every allowance and relief you’re entitled to, tell you exactly what to pay and when, and file your return with HMRC - often with a lower bill than you expected.
What's included
Full SA100 return
All the relevant supplementary pages - self-employment, property, dividends, capital gains and more.
Expense & allowance review
We make sure every allowable expense and relief is claimed so your bill is as low as it legally can be.
Tax owed, made clear
A simple summary of what to pay, when, and how - including payments on account.
HMRC filing
We file online and send you confirmation and a copy for your records.
Deadline reminders
We chase you (gently) well before 31 January so it’s never a last-minute rush.
Year-round questions
Fixed fee means you can ask us things during the year without watching the clock.
Ideal if you're…
- Self-employed or a freelancer / sole trader
- A landlord with rental income to declare
- A company director taking dividends
- Earning over £50,000 with Child Benefit to reconcile
- New to Self Assessment and unsure what you can claim
- Behind on a previous year and want to get straight with HMRC
How it works
Quick onboarding
We register you for Self Assessment if needed and get authorised as your agent with HMRC.
Share your figures
Send income and expenses however suits you - spreadsheet, app, or a shoebox of receipts.
We prepare & check
We draft the return, claim your reliefs and send it to you with the tax figure explained.
Approve & file
You give the nod, we file with HMRC, and you know exactly what to pay.
Self Assessment - your questions
When is my Self Assessment due?
Online returns and any tax owed are due by 31 January following the end of the tax year (5 April). We aim to get yours done long before then so you can budget for the bill.
How much can you save me?
It depends on your situation, but people who file their own returns often miss allowable expenses, the trading allowance, pension relief or the correct treatment of dividends. We routinely find deductions that more than cover our fee.
I haven’t filed for a previous year - can you help?
Yes. We can prepare late returns, deal with HMRC on your behalf and, where possible, help reduce penalties. The sooner we act, the better the outcome.
Do I need to register for Self Assessment?
If you’re newly self-employed, a new landlord or have new untaxed income, you likely do - and there are deadlines for registering too. We’ll sort it as part of onboarding.
Get your tax return off your plate
Send us your figures and we'll file an accurate return, claim everything you're owed and tell you exactly what to pay.