Self Assessment
If your personal affairs are complicated, then completing a Self-Assessment tax return can be a daunting process. Failing to submit a return on time will incur a penalty which increases over time the longer it is outstanding. The continual changes to the tax system in the UK make completing tax returns harder and harder potentially resulting in more fines further down the line.
At SJPR we can save you a lot of time, worry, and money by handling your Self-Assessment tax return for you. We will do all the necessary computations, complete your return, and even offer advice on how you can minimise your tax liability.
We can act as your agent, dealing directly with the HMRC on your behalf and, should you be selected for a Self-Assessment enquiry, act for you at any meetings.
Get in touch to now to find out more.
Self Assessment tax returns prepared and filed for you
If you are self-employed, a landlord, a company director or have income that is not taxed at source, you are likely to need a Self Assessment tax return. SJPR Accountants prepares and files your return accurately, claims every relief you are entitled to and makes sure HMRC deadlines are met.
Who needs to file a Self Assessment return?
- Sole traders and partners in a business partnership
- Landlords receiving rental income
- Company directors with untaxed income such as dividends
- Individuals with foreign income or gains
- People who have sold assets and have Capital Gains Tax to pay
- Higher earners affected by the High Income Child Benefit Charge
Key Self Assessment deadlines
- 5 October: register for Self Assessment if you are filing for the first time
- 31 October: paper tax return deadline
- 31 January: online return deadline and balancing payment
- 31 July: second payment on account
A late return triggers an automatic £100 penalty, with further penalties the longer it remains outstanding, plus interest on unpaid tax.
Making Tax Digital for Income Tax
Since April 2026, sole traders and landlords with qualifying income above £50,000 must keep digital records and send quarterly updates to HMRC. The threshold falls to £30,000 from April 2027 and £20,000 from April 2028. SJPR sets up compliant software and handles the quarterly submissions for you.
International clients
We regularly advise Brazilian and Portuguese clients on UK residence, foreign income, double taxation relief and the rules that replaced the non-dom regime from April 2025.
Frequently asked questions
What is the deadline for an online Self Assessment return?
The online deadline is 31 January following the end of the tax year, which is also when any balancing payment is due.
What is the penalty for filing late?
HMRC charges an automatic £100 penalty for a late return, with daily and further fixed penalties if it remains outstanding for longer.
Does Making Tax Digital apply to me?
From April 2026 it applies to sole traders and landlords with qualifying income above £50,000, falling to £30,000 in April 2027 and £20,000 in April 2028.
Can SJPR help with foreign income?
Yes. We advise on residence, reporting foreign income and gains, and claiming double taxation relief.
Speak to SJPR Accountants. Call 020 3371 0292 or contact our London team to book a consultation.