Your Self Assessment filed by a qualified UK accountant, from £275 + VAT.
What this means for you
Experience the difference with expert self-assessment
Your return is prepared and reviewed by an ACCA or ICAEW-qualified accountant. No form-filling on your side, no guesswork, and a professional standing behind every figure.
We check every allowance and expense you're entitled to claim, so the fee often pays for itself in tax you'd otherwise have overpaid.
You know the cost before we start. No hourly billing, no surprise charges, and any complex work priced in writing before we begin.
As your registered agent, we submit your return straight to HMRC and deal with them on your behalf, so you never have to.
We manage the deadline for you and file well ahead of 31 January, so there's no last-minute panic and no risk of a £100 penalty for late filing.
Share your details through our secure portal and we take it from there. Everything's handled with MTD-compliant cloud tools like Xero, kept safely in one place.
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A self assessment tax return is how you report your income to HMRC when tax isn’t fully deducted through PAYE. It involves declaring income, expenses, and any other taxable gains for the tax year.
HMRC then calculates how much tax you owe or whether you’re due a refund. It must be submitted accurately and on time to avoid HMRC or Companies House penalties.
If you need more information on how to register for Self Assessment with HMRC, check out our guide.
You’ll usually need to file a self assessment tax return if you’re self employed, a company director, a landlord, or receive untaxed income. It can also apply if you earn over certain thresholds, claim child benefit on a high income, or have capital gains to report. If HMRC can’t tax you automatically, self assessment is required.
Filing late or submitting incorrect information can lead to automatic penalties, interest charges, and follow-up from HMRC. Even small mistakes can trigger fines or investigations. Using a professional self assessment tax return service helps ensure your return is accurate, complete, and submitted on time, reducing the risk of unnecessary penalties or stress.
Your self assessment tax return must include all taxable income for the year. This can include self employed income, dividends, rental income, freelance work, interest, and certain benefits. You’ll also need to report any capital gains. Including everything correctly is essential, as missing income can lead to penalties or amended tax bills.
Yes. When you use our self assessment tax return service, we can act as your agent and liaise with HMRC for you. This means we handle submissions, respond to queries, and help resolve issues if HMRC needs clarification. It saves you time and removes the pressure of dealing with HMRC directly.
Our self assessment tax return service starts from a fixed fee of £275 plus VAT for a standard return. This includes preparation, review, and submission to HMRC. If your tax affairs are more complex, we’ll always explain any additional costs upfront before starting, so you know exactly what to expect.
You’ll need to share details of your income, expenses, and any other relevant financial information for the tax year. This may include invoices, bank statements, dividend records, or rental income details. We’ll guide you on exactly what’s needed and keep the process simple, so nothing important is missed.
We take the protection of your personal and financial data seriously.
Sleek maintains several recognised security certifications and compliance frameworks. Our organisation is certified for ISO 27001:2022, PCI DSS, and SOC 2, and our systems and processes are designed to comply with GDPR requirements.
These certifications reflect our commitment to maintaining strong information security controls, protecting sensitive data, and adhering to internationally recognised privacy and security standards.
