Whether you’re self-employed, a landlord, or company director, our self-assessment accountants provide expert support, accurate filings, and strategic tax planning to minimize your liability.
What Does Our Self Assessment Service Cover?
Complete Tax Return Preparation
We prepare your entire self-assessment tax return, gathering all necessary information about your income, expenses, and financial circumstances. Our accountants ensure every detail is accurate and compliant with HMRC requirements, eliminating the risk of errors that could trigger penalties or investigations.
Income Calculation and Verification
We calculate and verify all your income sources, including employment income, self-employment profits, rental income, dividends, interest, and any other taxable income. Our thorough approach ensures nothing is overlooked and all income is correctly reported to HMRC.
Allowable Expense Claims
Maximizing your allowable expense deductions is crucial to reducing your tax liability. We identify and claim all legitimate business expenses, from home office costs and travel to professional subscriptions and equipment purchases, ensuring you only pay the tax you truly owe.
Tax Liability Computation
Our accountants calculate your exact tax liability, including income tax, National Insurance contributions, and any capital gains tax due. We also calculate payment on account requirements for the following year, so you can budget accordingly with no surprises.
Capital Gains Tax Calculations & Returns
If you’ve sold property, shares, or other assets, we calculate any capital gains tax liability through a separate return, applying available allowances and reliefs to minimize your tax bill. Our expertise ensures you benefit from all exemptions you’re entitled to claim.
HMRC Online Submission
We handle the entire submission process, filing your tax return electronically with HMRC before the 31 January deadline. You’ll receive confirmation of successful submission and a copy of your completed return for your records.
Deadline Management
Never worry about missing critical deadlines again. We manage all important dates, including registration deadlines, filing deadlines, and payment dates, sending you timely reminders to ensure you remain compliant and avoid penalties.
Payment on Account Management
Understanding and managing payments on account can be confusing. We calculate your required advance payments, explain how they work, and help you plan your cash flow to meet these obligations without financial strain.
Tax Planning and Advisory
Beyond basic compliance, we provide strategic tax planning advice to help reduce your future tax liabilities. This includes guidance on pension contributions, timing of income and expenses, and structuring your affairs in the most tax-efficient manner.
HMRC Correspondence Support
If HMRC has questions about your return or opens an enquiry, we handle all correspondence on your behalf. Our team responds to queries, provides requested information, and represents your interests throughout any HMRC interactions.
Year-Round Access and Support
Our service doesn’t end at submission. You have year-round access to our team for tax-related questions, advice on financial decisions with tax implications, and support with any issues that arise throughout the tax year.
Previous Years’ Returns
If you have unfiled tax returns from previous years, we can help. We prepare and submit late returns, negotiate penalty reductions where possible, and ensure you’re fully compliant going forward, providing peace of mind and resolving outstanding tax matters.
How We Make Self Assessment Easier for You
- HMRC MTD Implementation – As HMRC’s MTD takes effect in April 2026, we make sure our clients are equipped and ready for the transition.
- Forward Planning – We use current data to proactively plan strategies that reduce your business liabilities.
- Identifying Reliefs – HMRC offers numerous reliefs, and we carefully determine which ones your business is eligible for, ensuring you benefit from all available opportunities.
- Team of experts – It’s more than just figures for us. We combine regulatory expertise with a deep understanding of your specific circumstances.
- The Easy Option – Save yourself time, uncertainty, stress, and worry by letting professionals handle it for you.
- Deadline & Filing – It’s our responsibility to ensure we file your returns on time and inform you of required payments
Who Needs to File a Self Assessment Tax Return?
- Self-employed individuals and sole traders
- Company directors
- Landlords with rental income
- Those with untaxed income over £1,000
- Higher earners (£100K+)
- People with capital gains
- Those claiming tax reliefs
Your Self Assessment Journey with Us
FAQs Related to Self-Assessment Tax Return
What is self-assessment?
Self-assessment is the system HMRC uses to collect income tax from individuals who have income that isn’t automatically taxed at source. Unlike employees who have tax deducted through PAYE, self-assessment requires you to report your income and calculate your tax liability yourself by completing an annual tax return.
This includes income from self-employment, rental properties, dividends, capital gains, and other untaxed sources. You must file your return by 31 January following the end of the tax year (which runs from 6 April to 5 April), and pay any tax owed by the same deadline. Self-assessment ensures everyone pays the correct amount of tax based on their complete financial picture.
When is the self-assessment deadline?
The self-assessment deadline depends on how you file your return. If filing online, the deadline is 31 January following the end of the tax year. For example, for the 2024/25 tax year (6 April 2024 to 5 April 2025), your online return must be submitted by 31 January 2026. If you’re filing a paper return, the deadline is earlier at 31 October. You must also pay any tax owed by 31 January, including any payment on account for the following year.
What happens if I miss the self-assessment deadline?
Missing these deadlines results in automatic penalties starting at £100, with additional charges accruing for longer delays. We ensure all our clients’ returns are filed well before the deadline to avoid penalties.
Can Flux Accounting reduce my tax bill?
Yes! By reviewing your income, expenses, and reliefs, we make sure you only pay what you owe and not a penny more.
Do I need to file if I’m on PAYE?
Not always. If all your income is taxed at source through PAYE, you may not need to file. But if you have other untaxed income, HMRC will require a return.
What is payment on account and how does it work?
Payment on account is an advance payment system where you pay your estimated tax bill in two installments before the actual tax year ends. If your previous year’s tax bill exceeded £1,000, HMRC requires you to make two payments on account, each worth 50% of the previous year’s tax liability.
The first payment is due on 31 January (alongside your tax return), and the second on 31 July. Once your actual tax liability is calculated after filing your return, any difference is settled through a balancing payment or refund. This system helps spread the tax burden throughout the year rather than paying everything in one lump sum, though it can be challenging for those with fluctuating incomes.
