Self Assessment tax returns, prepared and filed.
Your personal tax return, prepared from your records, checked with you and filed with HMRC.
GS Associates prepares and files Self Assessment tax returns for sole traders, the self-employed, landlords, CIS subcontractors and company directors from our Uttoxeter office, and remotely across the UK. We work out what you owe, claim the expenses and reliefs you're entitled to, and tell you what to pay and when. Send your records early and we aim to file well before 31 January. Fixed fee, agreed before we start.
For the self-employed, landlords and directors
What goes into
your return.
Send us your income and expense records, and we prepare the return, check it with you and file it. You get a clear statement of the tax due, the payment dates and, where relevant, the payments on account for next year.
- Self-employment income
- Your trading figures, allowable expenses and capital allowances, on the cash basis or traditional accounting as suits you.
- Other income
- Rental income, dividends, savings interest, pensions and employment, all brought together in one return.
- CIS deductions
- Tax already deducted by contractors set against what you owe, and any repayment claimed.Support for CIS subcontractors
Not sure whether you need to file?
Who has to send
a tax return.
You usually need one if you were self-employed and earned more than the trading allowance, rented out property, had untaxed income, or HMRC has asked you to file. Company directors often need one too. If you're not sure, ask us before the registration deadline rather than after.
We also check the things people miss: the expenses you can claim, the reliefs you're entitled to, and whether the payments on account HMRC asks for are actually right for the year ahead.
Self Assessment
Your questions,
answered.
When is my Self Assessment tax return due?
Online returns and the tax itself are due by 31 January after the end of the tax year, so the 2025–26 return is due by 31 January 2027. Paper returns are due earlier, by 31 October. If you need to file for the first time, register with HMRC by 5 October after the tax year ends. Our deadlines guide has the key dates.
GOV.UK: Self Assessment deadlines
What happens if I file late?
For an ordinary Self Assessment return there's an automatic £100 penalty the day after the deadline, even if no tax is due, with further penalties at three, six and twelve months. Interest is charged on tax paid late, and there are separate late-payment penalties. If you're already late, get in touch: filing sooner limits the further penalties. Returns for your first Making Tax Digital year follow a different, points-based system.
GOV.UK: Self Assessment penalties
Can you deal with HMRC on my behalf?
Yes. Once you authorise us as your agent, we can see your account, submit your return and speak to HMRC about it. If you've had a letter you don't understand, send it over and we'll tell you what it means.
Does Making Tax Digital change my tax return?
If you're a sole trader or landlord with qualifying income above the threshold for the relevant tax year, yes: digital records, quarterly updates and the year-end return through software, from the start date linked to that year. Your 2025–26 return is still filed the usual way by 31 January 2027. We'll check whether and when it applies to you.
HMRC: check if and when MTD for Income Tax applies
What does a Self Assessment tax return cost?
A fixed fee agreed upfront, depending on what's in the return: a single self-employment with tidy records is straightforward; rental income, CIS deductions, dividends or capital gains take more work. We tell you the fee before we start and it doesn't change unless the scope does.
Tax return due, or already late?
Tell us what income you have and how your records look. We'll explain what's needed and agree a fixed fee.
