Get your Self Assessment tax return filed quickly and accurately by a qualified UK accountant. From just £99, we help self-employed individuals, landlords, CIS workers, investors, and expats meet HMRC deadlines with professional support throughout the process.
Self Assessment is the system HM Revenue & Customs (HMRC) uses to collect tax from individuals who don’t pay tax through PAYE alone. If you’re self-employed, a business owner, or have additional income sources, understanding Self Assessment is crucial for your tax compliance. Below, we explain the key Self Assessment deadlines, how to file your return and when professional help about completing your tax return, including deadlines, how to file online, and where to get expert help when you need it.
A Self Assessment tax return is how you report your income to HMRC if you’re self-employed or have income that isn’t taxed at source. The system requires you to calculate your own tax liability, hence the name “Self Assessment.”
⚠️ Missing these key dates can result in automatic penalties starting at £100, which increase the longer you delay.
If you’ve never completed a Self Assessment before, you must register to get your credentials:
HMRC’s online portal makes submitting your financial information straightforward:
You’ll need to record all sales income and business-related outgoings. Depending on your business size and operational model, you can choose between cash basis bookkeeping or traditional accounting methods.
If you receive rental returns from a single property or a portfolio, you must declare this income to HMRC. Various standard management expenses, maintenance outgoings, and allowances can be safely deducted to optimize your tax bill.
If you’ve sold valuable assets at a profit such as cryptocurrency, investments, company shares, or a secondary residential property you will need to report these specific gains.
Being fully employed under standard payroll doesn’t exempt you if you earn extra money on the side. If you have secondary dividend allocations, high-earner child benefit adjustments, or side-hustle profits exceeding thresholds, you must complete a return.
Good record keeping is essential for accurate returns. You must retain all business invoices, income streams, bank statements, purchase receipts, and previous calculations.
HMRC rules dictate that you must keep these records securely for at least 5 years after the submission deadline has passed.
At Tax Return Assist, we specialize in making Self Assessment simple, stress-free, and affordable. Our local team of tax specialists can handle every element of your return on your behalf from standard HMRC registration right through to optimization, calculations, and final digital filing.
Alternative HMRC Helpline: 0300 200 3310 (For manual phone support directly via HMRC agents).
Getting your taxes sorted with Tax Return Assist is quick, secure, and completely online.
Provide your income and expense details online through our secure portal. It only takes a few minutes to safely submit your tax documents.
After processing payment, we match you with a qualified, UK-certified accountant who will personally prepare your tax return and answer your questions.
Review your completed calculation summary. Once you approve your tax return, our legal accountants file it directly with HMRC on your behalf.
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You must submit a Self-Assessment return if you earn untaxed income. The most common scenarios include being self-employed or a sole trader earning over £1,000, being a business partner, receiving rental income from property, earning over £10,000 from savings or investments (dividends/shares), or needing to pay the High Income Child Benefit Charge. If you are unsure, our team in Grays can review your income streams to determine your exact filing requirements.
If you are filing a traditional paper tax return, the deadline is 31 October following the end of the tax year. If you are filing your return online, the deadline is 31 January. Your final tax bill and any balancing payments on account must also be paid to HMRC by 31 January. Missing these dates triggers an automatic, immediate £100 late penalty, with further fines accumulating after 3 months.
You must keep accurate records of all business income and expenses, including sales invoices, bank statements, receipts for business purchases, P60 or P45 forms from regular employment, and documentation of any secondary personal income. Under HMRC regulations, self-employed individuals and business owners must retain these financial records securely for at least 5 years after the submission deadline in case of an HMRC check or audit.
Filing your own taxes can be time-consuming and confusing. At Tax Return Assist, we handle the entire process for you. Based in Grays, Essex, our tax specialists will register you with HMRC, accurately calculate your total tax liability, claim every legitimate business expense and tax relief you are entitled to, and submit your return digitally. We offer completely transparent, fixed-fee plans so you never have to worry about hidden hourly bills or missing an HMRC deadline.
Our accountants are experienced in HMRC Self Assessment rules and UK tax compliance.
Expert tax & accountancy services for individuals, businesses, and contractors across the UK — fixed monthly or one-time fees. Trusted for our all-inclusive service plans.
Tax Return Assist Ltd is a registered Companies House Authorised ACSP, professionally regulated under the Institute of Financial Accountants (IFA).
