Accurate, hassle-free Self Assessment tax filing.
The UK tax system is complex, and even a straightforward Self Assessment return can be tricky to get right. We use HMRC-approved software to prepare your return, calculate your tax, file it online and tell you exactly what to pay — on fixed, competitive pricing.
Filed right, stress-free
- Chartered Certified Accountants
- HMRC-approved software — filed online
- Fixed, competitive pricing
- Ready for Making Tax Digital (MTD)
Your Self Assessment, prepared and checked properly
At Harrow Accountants, we use HM Revenue & Customs-approved software to complete your tax return, calculate your tax liability, file it online, and advise you on the payments due.
We also analyse your Self Assessment return for potential tax savings and check for anomalies before submission.
With our fixed, competitive pricing, you get peace of mind and can focus on running your business rather than wrestling with HMRC.
Whether you're self-employed, a landlord, a company director or have multiple income sources, we make sure your return is accurate, optimised and filed well before the deadline.
Our Self Assessment tax return service
Everything handled — from preparation to payment advice.
Our service includes
- Accurate tax return preparation and submission
- Tax liability calculation
- Review and optimisation to identify savings
- Clear advice on payment amounts and deadlines
Benefits
- Avoid costly errors and penalties
- Maximise legitimate tax savings
- Save time and stress
- Fixed, competitive pricing for easy budgeting
Making Tax Digital for Income Tax (MTD for ITSA)
Making Tax Digital for Income Tax is a new way for sole traders and landlords to report their income and expenses to HMRC. Instead of one return a year, you'll keep digital records and send quarterly updates using compatible software. It's a big shift — and we're already set up to handle it for you, so the switch is seamless.
Keep digital records of your self-employment and property income, send HMRC quarterly updates, then finalise and pay by 31 January.
Individuals in Self Assessment with income from self-employment and/or property above the qualifying threshold.
Mandatory for qualifying income over £50,000, extending to over £30,000 from April 2027 and over £20,000 from April 2028.
MTD-compatible software set up for you, digital records kept, quarterly updates filed, and your final return submitted — all done for you.
Expert Self Assessment support in Harrow
If you want expert support with your Self Assessment tax return, talk to Harrow Accountants today. Speak with our team for professional Self Assessment help — available to clients throughout London and beyond.
There's no limit on where you're based — we look after Self Assessment clients throughout London and beyond, in person and fully remotely.
Self Assessment FAQs
We work on fixed, competitive pricing agreed upfront, so you know the cost before we start. The fee depends on how complex your return is — self-employed, landlord, dividends or multiple income sources. A quick call gives you an exact figure.
For online returns the deadline is usually 31 January following the end of the tax year, which is also when any tax is due. We prepare, check and file your return well before the deadline so you never face a penalty.
It's a new HMRC system for sole traders and landlords. Instead of one annual return, you keep digital records and send quarterly updates to HMRC using compatible software, then finalise your position and pay by 31 January. We handle the software and the submissions for you.
From 6 April 2026 it's mandatory if you're registered for Self Assessment with qualifying income over £50,000 from self-employment and/or property. The threshold then lowers to over £30,000 from April 2027 and over £20,000 from April 2028. We'll tell you exactly when it applies to you and get you ready in good time.
Yes. As your agent we set up MTD-compatible software, keep your digital records, file your quarterly updates and submit your final return — so the move to Making Tax Digital is seamless and you stay compliant.
Not at all. We're based in Stanmore, Harrow and look after plenty of local clients, but there's no limit on where you're based — we work with Self Assessment clients throughout London and the UK, in person and remotely.
Get your Self Assessment sorted
Accurate, optimised and filed on time — with full Making Tax Digital support built in. Speak with our friendly team today.
Based in Stanmore & Harrow, serving London and UK