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Self Assessment Tax Returns in Glasgow — Filed On Time, Every Time

You must file a self assessment tax return if you are self-employed, a company director with untaxed income, a landlord, or you have capital gains to report. The online deadline is 31 January. Miss it and HMRC charges an automatic £100 penalty, even if you owe no tax at all.

January is the worst possible month to discover you owe money. We prepare your return well before the deadline, tell you the figure early, and make sure you have claimed everything you are entitled to. And because we are based in Glasgow, we apply the Scottish rates — six bands, not three — which a lot of UK-wide online filing services get wrong.

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self assessment tax return Glasgow — Self-Assessment Tax Returns from QA FinTax, Glasgow

What Our Self-Assessment Tax Returns Service Includes

  • SA100 personal tax return prepared and filed online with HMRC
  • Property income schedules (SA105) for residential and commercial landlords
  • Capital gains declarations and relief advice
  • Foreign income and complex high-earner reporting
  • Correct Scottish income tax rates applied to every return
  • Pre-submission checks to avoid HMRC red flags

Who Needs to File a Self Assessment Tax Return?

HMRC does not always tell you that you need to file. The obligation is yours to spot, and the penalty for missing it is yours to pay. You almost certainly need to file a return if any of the following applies to you.

  • You were self-employed as a sole trader and earned more than £1,000
  • You are a partner in a business partnership
  • You are a company director with income that has not been taxed at source
  • You rent out property — including a single room or a holiday let
  • You have capital gains to report, such as a second property or share disposal
  • You have untaxed income from savings, investments or dividends
  • You have foreign income, or you are not UK-domiciled
  • Your income is over £150,000

What Are the Self Assessment Deadlines?

Every one of these dates is a hard deadline. HMRC does not send a reminder you can rely on, and "I did not know I had to register" is not a defence that works.

Self assessment deadlines
ObligationDeadline
Register for self assessment (first time)5 October after the end of the tax year
File a paper return31 October
File online31 January
Pay any tax you owe (balancing payment)31 January
First payment on account31 January
Second payment on account31 July
The UK tax year runs 6 April to 5 April. For the 2025/26 tax year, the online filing and payment deadline is 31 January 2027.

How Is Income Tax Calculated in Scotland?

Scotland has six income tax bands. The rest of the UK has three. If you live in Scotland you pay Scottish rates on your non-savings, non-dividend income — your salary, your self-employed profits, your pension and your rental income — and your tax code begins with an S.

Scottish income tax rates and bands, 2026/27
BandTaxable incomeRate
Personal allowanceUp to £12,5700%
Starter rate£12,571 to £14,87619%
Basic rate£14,877 to £26,56120%
Intermediate rate£26,562 to £43,66221%
Higher rate£43,663 to £75,00042%
Advanced rate£75,001 to £125,14045%
Top rateOver £125,14048%
Scottish rates apply to non-savings, non-dividend income only. Savings and dividend income is taxed at UK-wide rates. The personal allowance is reduced by £1 for every £2 of income above £100,000.

What Happens If You Miss the Self Assessment Deadline?

The £100 penalty is automatic and applies even if you owe no tax or are due a refund. It gets considerably worse from there, and daily penalties accrue whether or not you eventually file.

HMRC penalties for a late self assessment return
How latePenalty
1 day late£100 — automatic, even if no tax is owed
3 months late£10 per day, up to a maximum of £900
6 months lateA further 5% of the tax due, or £300 if greater
12 months lateAnother 5% of the tax due, or £300 if greater
Separate penalties and interest apply to tax paid late, on top of the late filing penalties above.

Does Making Tax Digital Replace Your Tax Return?

Not exactly — it adds to it. Since April 2026, sole traders and landlords with qualifying income above £50,000 must keep digital records and send HMRC a quarterly update, then finalise the year. The threshold falls to £30,000 in April 2027 and £20,000 in April 2028. If that is you, an annual shoebox of receipts is no longer legal. We set the software up and run the quarterly cycle for you.

Self-Assessment Tax Returns in Glasgow — Frequently Asked Questions

You do if you were self-employed and earned over £1,000, rent out property, are a partner in a partnership, have capital gains to report, or have untaxed income from savings, dividends or abroad. Company directors with untaxed income generally need to file too.
Midnight on 31 January for an online return, and 31 October for a paper one. Any tax you owe is also due on 31 January, along with your first payment on account. The second payment on account falls due on 31 July.
Scotland has six bands — starter 19%, basic 20%, intermediate 21%, higher 42%, advanced 45% and top 48% — against three in the rest of the UK. They apply to your earned, self-employed, pension and rental income. Savings and dividends are still taxed at UK-wide rates.
File as soon as you can, because the penalties grow with time: £100 immediately, then £10 a day from three months, then percentage-based penalties at six and twelve months. Pay whatever you can to stop interest accruing. If you had a genuine reasonable excuse, we can appeal on your behalf.
Costs incurred wholly and exclusively for the business: stock, tools, professional fees, business insurance, business travel, and a proportion of your home and phone costs if you work from home. Personal costs and client entertaining are not allowable. The line matters — HMRC checks it.
It is an advance payment towards next year's tax bill, and it catches people out badly in their first year. If you owe more than £1,000, HMRC asks for half of it again on 31 January and the other half on 31 July. So your first January bill can be one and a half times what you expected.
Yes. You can usually still submit a late return for earlier years, and we regularly bring clients back into compliance who have several years outstanding. Filing voluntarily before HMRC contacts you almost always produces a better outcome than waiting to be found.

Official sources

Rates and thresholds are stated for the 2026/27 UK tax year and are for general guidance only. They are not a substitute for advice on your own circumstances.

Ready to get started with self-assessment tax returns?

Book a free 15-minute review with a Glasgow adviser. We will tell you exactly what you need and what it will cost — before you commit to anything.

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