Self Assessment Tax Returns: A Practical Guide for Sole Traders and Limited Company Directors

Self Assessment is HMRC's system for collecting tax from people whose income isn't taxed at source through PAYE. If you are self-employed, a limited company director, a landlord, or you have income from multiple sources — you almost certainly need to file one.

Here is what you need to know.

Who Needs to File a Self Assessment Return?

You need to register for Self Assessment and file a return if any of the following apply:

•       You are self-employed as a sole trader and earned more than £1,000

•       You are a limited company director receiving income beyond your PAYE salary

•       You receive rental income from property

•       Your income from all sources exceeds £100,000

•       You have foreign income

•       You receive child benefit and either you or your partner earns over £60,000

•       You have capital gains to declare

Key Deadlines

5 October: Register for Self Assessment if it's your first return

31 October: Deadline for paper returns (most people file online)

31 January: Online filing deadline AND payment of any tax owed

31 July: Payment on account deadline (second instalment)

What's Included in a Self Assessment Return?

The return covers all income received in the tax year (6 April to 5 April the following year), including:

•       Employment income — from PAYE jobs or directorships

•       Self-employment income and allowable expenses

•       Dividend income from your limited company

•       Rental income and allowable property expenses

•       Bank interest and investment income

•       Capital gains from property, shares, or business assets

Payments on Account

If your tax bill exceeds £1,000, HMRC requires payments on account — advance payments towards next year's bill. These are due on 31 January and 31 July, each equal to 50% of the previous year's tax bill. Many people are caught out by this in their first year — the January payment covers both the year just ended and the first payment on account for the next year.

What Sole Traders Often Miss

•       Mileage claims — 45p per mile for the first 10,000 miles

•       Use of home as office — either a flat rate or a proportion of actual costs

•       Capital allowances on equipment and tools

•       Pension contributions — tax-deductible and often overlooked

•       Prior year losses — these can offset current year profits

How VABK Handles Self Assessment

VABK prepares self assessment returns for sole traders, limited company directors, landlords, and construction contractors with CIS income. We review your records, identify all allowable deductions, and file before the deadline. We also flag if payments on account need adjusting based on your current year income.

Need your self assessment filed correctly? Book a free consultation.

calendly.com/mariaalla/free-consultation  |  maria@vabk.co.uk  |  WhatsApp: +44 07721 407 907