Self-Assessment Tax Return
Self-Employed Accounting
Who needs to file a Self-Assessment?
You must complete a self-assessment tax return if you earn income in the UK other than a salary or pension. This includes income from:
- self-employment
- property rental
- selling on Etsy, eBay and similar platforms (over £1,000 per year)
- savings, investments or dividends
- overseas income
- selling assets, e.g. property or shares
- partnership income (e.g. being a partner in a limited company)
- construction subcontracting under the CIS
If you are a UK landlord living in Poland, you are also required to submit a self-assessment for your rental income.
Employees with Additional Income Outside of Employment
If you are employed and receive a P60, your employer only reports your income from that employment. However, if you also have other sources of income – such as dividends, rental income, or cryptocurrency sales – you must report them yourself through a Self-Assessment tax return.
Self-Assessment Deadlines
- 31 October: deadline for submitting a paper tax return
- 31 January: deadline for submitting an online tax return
- 31 January: final deadline for paying your tax bill
- 31 July: deadline for the second payment on account for the current tax year (only applies if you paid over £1,000 in tax the previous year)
Self-Assessment with Sepera Accounting
For self-employed individuals, crypto traders, landlords, Etsy sellers and anyone earning additional income in the UK. Convenient annual Tax Return Self-Assessment filing. Online service – no need to leave your home, professional and on time.
Why Trust Us with Your Tax Return?
100% Accuracy Guaranteed
Minimum Tax,
Maximum Refund
We Handle
Late Filings
Important Update: Making Tax Digital for Self Assessment in 2026
From April 2026, HMRC is introducing major changes to the way Self Assessment tax returns are submitted. This is part of the government’s Making Tax Digital (MTD) initiative — a move towards a more modern, streamlined, and digital tax system. If you’re self-employed or a landlord earning over £50,000 per year, you’ll need to follow the new rules from April 2026. Those earning between £30,000 and £50,000 will join the system from April 2027.
What will change?
Instead of sending one Self Assessment tax return per year, you’ll need to:
- Keep digital records using HMRC-approved software
- Send quarterly updates to HMRC about your income and expenses
- Submit an end-of-year final declaration (similar to the current Self Assessment)
What does this mean for you?
We understand that this may feel like a significant change, but don’t worry – we’re here to make the transition smooth and stress-free. Our team is already preparing for MTD, and we’ll be offering full support with:
- Choosing the right software
- Setting up your digital bookkeeping
- Managing quarterly submissions
- Ensuring compliance with the new rules
Not sure if this applies to you?
Get in touch and we’ll check your situation. Whether you’re already a client or just looking for guidance, we’re happy to help.
Prices for Self-Assessment
The cost of completing your Self-Assessment depends on your annual turnover.
This refers to your income for the tax year, which runs from 6 April to 5 April of the following year.
"Zero"
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no income
15K
-
annual turnover up to £15,000
30K
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annual turnover £15,000–£30,000
30K+
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Self-Assessment Tax Return 30k+
Important Information
- For turnovers above £50,000 - bespoke pricing applies. Contact us for a tailored quote.
- You must file a Self-Assessment each year until you deregister as self-employed.
- HMRC activation codes may take up to 3 weeks – plan ahead.
- Late filing or non-payment may lead to HMRC fines from £100 to £3,000.
Order Your Self-Assessment
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