Self Assessment Tax Returns for UK Sole Traders, Landlords and Directors
Most people do not leave their self assessment until January because they want to. They leave it because the figures live in three different places, the receipts are in a shoebox, and the HMRC login is on a sticky note that is now lost.
We do it differently.
NDCA prepares and files self assessment tax returns for UK sole traders, landlords, company directors, partners and high earners. We are ACCA-regulated, work primarily on Xero, and charge a fixed monthly fee so your tax return is not a panic in January — it is filed early and the bill is known months in advance.
Contact us today for a free consultation to walk through your situation.
What our self assessment service covers
A dedicated accountant prepares your personal tax return from start to finish. That includes:
- SA100 preparation and filing with HMRC
- Self-employment pages (SA103) for sole traders
- Property income pages (SA105) for landlords
- Partnership pages (SA104) for partners
- Capital gains pages (SA108) for disposals of property, shares or other assets
- Dividend and savings income for company directors and investors
- High Income Child Benefit Charge calculation
- Pension contribution and Gift Aid relief
- Payments on account scheduling and explanation
- HMRC liaison and tax code reviews
If you also run a limited company, we file your corporation tax and director self assessment together so the figures match.
How NDCA works
Three things make our self assessment service different.
- Fixed monthly fee
Your tax return is not a January invoice. It is built into the fixed fee we agreed when you joined. You know exactly what you are paying twelve months in advance. - A real human, fast
A named accountant prepares your return and answers your questions. No ticket queue. Most queries get a same-day reply. - Filed early, not at the deadline
Filed early, not at the deadline — Most clients hand over their records well before 31 January and have their return drafted, reviewed, and filed long before the deadline rush. That means you know your tax bill in advance, not the night before payment is due. Time to plan. Time to budget. Time to fix anything you can fix.
Who we work with
NDCA self assessment clients fall into a few groups:
- Sole traders who have outgrown the spreadsheet-and-shoebox method
- Landlords with single properties or full portfolios
- Company directors paying themselves through salary and dividends
- Partners in trading or professional partnerships
- High earners over £100,000 with multiple income sources
- High Income Child Benefit Charge cases
- Anyone who has sold property, shares, crypto or another asset and needs a capital gains return
If your situation is not on the list, send us a message — it almost certainly fits.
Need your self assessment filed?
Most clients file well before January. The earlier you start, the longer you have to plan for the tax bill. Send us your details — we'll come back within one working day with a fixed monthly quote.
Reviews
Discover why businesses trust us for dependable accounting services and practical financial advice.
Switching from another accountant
If you already have an accountant and you are not happy, switching is simpler than people think. We send your current accountant a professional clearance letter, collect your records, and pick up where they left off. Most clients are fully on-boarded within two weeks.
You do not need to wait for the next tax year. You do not need an awkward phone call. We handle it.
Self assessment FAQs
NDCA fees depend on your sources of income, the complexity of your return (rental properties, capital gains, foreign income), and what else is bundled in (bookkeeping, payroll, limited company work). You get a fixed fee price upfront. Get a quote on 01903 968618.
The 2025/26 tax year ends on 5 April 2026. Online self assessment returns must be filed by 31 January 2027. Any tax due is also payable on 31 January, with payments on account on 31 January and 31 July if your liability is high enough. We file early so the deadlines do not catch you out.
You generally need to file if you are self-employed, a partner in a partnership, a company director with untaxed income, a landlord with rental income above the allowance, a high earner over £100,000, subject to the High Income Child Benefit Charge, or have sold an asset that triggers capital gains tax. If you are not sure, ask us.
Self assessment is paid by individuals on their personal income. Corporation tax is paid by limited companies on their profits. Most directors need both — corporation tax for the company, self assessment for the salary and dividends they take personally. We file them together so the figures match.
Yes. Sole traders can claim allowable business expenses, landlords can claim allowable property expenses, and employees can claim some work-related expenses. The rules differ by income type, and we apply the right ones for each section of your return.
HMRC applies an automatic £100 penalty if your return is more than one day late, with further penalties at three, six and twelve months. Interest is also charged on any tax paid late. We file early to keep you out of penalty territory.
If your gains exceed the annual exempt amount, yes. UK residential property disposals also need to be reported and paid within 60 days of completion through a separate return — we handle both.
From 6 April 2026, Making Tax Digital for Income Tax applies to sole traders and landlords with combined qualifying income above £50,000 (reducing in later years). Quarterly digital submissions replace much of the year-end work, but a final return is still required. We cover both on our Making Tax Digital page.
We are remote first. We work with clients across the UK using Xero, so location does not matter.
Yes. Book one on 01903 968618 or via the contact form.
Ready to file your self assessment early?
The 31 January deadline is fixed and the penalties for missing it are not. Most clients hand over their records once a year and never think about it again. Send us a few details — we'll come back within one working day with a fixed monthly quote.
