Clear Tax Support for Your Business and Property Income
Managing income from self-employment or UK property requires accurate records and a clear understanding of your tax responsibilities. We help sole traders and landlords organise their financial information, review relevant income and expenses, and prepare the appropriate sections of their Self Assessment return.
Whether you run your own business, let a single property or manage a growing portfolio, we provide practical guidance tailored to your circumstances. From considering allowable expenses and applicable reliefs to explaining your tax calculation, our support helps you stay organised, meet reporting deadlines and plan ahead with confidence.
Forms
SA103F self-employment (full)
Reports business income and expenses and calculates taxable profit and Class 4 National Insurance, with capital allowances, disallowable expenses and adjustments. For 2026-27, file by 31 October 2027 on paper or 31 January 2028 online. Turnover is box 15, expenses boxes 17 to 30 (total box 31) and disallowable amounts boxes 32 to 46.
SA103S self-employment (short)
For freelancers, tradespeople and consultants with turnover below £90,000. Turnover is box 9, expenses boxes 11 to 19 (total box 20), net profit box 21, capital allowances boxes 23 to 26, taxable profit box 31 and CIS deductions box 38.
SA105 UK property
Reports rental profits or losses where property income is above £1,000. You’ll need records of rent, tenancy agreements, expense receipts, mortgage interest statements, joint ownership shares and losses brought forward. Total rents are box 20, expenses boxes 24 to 29, adjusted profit box 38 and finance costs boxes 44 and 45.
Deadlines
File with the SA100 by 31 October 2027 on paper or 31 January 2028 online. Tax is due 31 January 2028. Late filing can attract a £100 penalty plus daily penalties.
Frequently Asked Questions
Let’s Discuss Your Requirements
Have a question about our services? Speak with our team to discuss your engagement, deadlines and the support you need.
Which Form Should a Sole Trader Use, SA103F Or SA103S?
The SA103S (short) is for straightforward businesses with turnover below £90,000, such as freelancers, tradespeople and consultants. The SA103F (full) is for turnover of £90,000 or more, or for more complex affairs. Choosing the right form matters because the full page asks for more detail, including capital allowances and disallowable expenses. If you are unsure which applies to you, we can review your figures and prepare the correct page.
What Is the Deadline For Filing Self-Employment and Property Income For 2026-27?
The SA103F, SA103S and SA105 are filed with your SA100 main return. For 2026-27, the deadline is 31 October 2027 for paper returns and 31 January 2028 for online returns. Any tax due must be paid by 31 January 2028. Filing early gives you more time to plan for the payment and avoids last-minute pressure.
What Penalties Apply If I File My Return Late?
Late filing can attract an initial £100 penalty, with daily penalties added if the return remains outstanding. Paying late can also lead to interest and further charges. The simplest way to avoid this is to gather your records early and file well before the deadline. We can manage your return and keep track of the dates for you.
When Do I Need To Report UK Property Income On The SA105?
The SA105 is used to report rental profits or losses where your property income is above £1,000. It covers income from houses, flats, land and holiday lets. Even if you make a loss, it may still be worth reporting so that it can be carried forward against future rental profits. We can help you work out whether you need to report your property income and complete the page correctly.
What Records Do I Need to Complete the SA105?
You will need records of rent received, tenancy agreements, receipts for expenses, mortgage interest statements, details of any joint ownership shares and any losses brought forward from earlier years. Keeping these organised throughout the year makes your return much quicker to prepare. We recommend keeping digital copies in one place so that nothing is missed when it is time to file.
What Can I Deduct As Expenses On My Self-Employment Return?
You can deduct expenses that are incurred wholly and exclusively for your business, and these are listed in the expenses section of the SA103F or SA103S. Some costs are disallowable, meaning they cannot be deducted, and the SA103F has a dedicated section to adjust for these. Capital allowances may also be claimed on certain equipment and assets. We can review your expenses and make sure you claim everything you are entitled to.
What are Finance Costs On The SA105 and How are They Reported?
Finance costs, such as mortgage interest on residential property, are reported separately on the SA105 rather than being deducted as a normal expense. They are recorded in dedicated boxes on the form. Providing your mortgage interest statements makes this section easier to complete. We can explain how finance costs affect your tax calculation and make sure they are entered correctly.
Do CIS Deductions Appear on my Self-Employment Return?
Yes. If you work in construction and have had tax deducted under the Construction Industry Scheme, the amount is reported on the SA103S in the CIS deductions box. It is treated as tax already paid and is taken into account in your tax calculation. Keep your monthly payment and deduction statements safe so you can enter the correct figure. We can help you reconcile your CIS records and claim any refund due.