Unlike employment income, tax is not deducted automatically from business or rental income. As a result, self-employed individuals and others with untaxed income are required to report their earnings through the Self Assessment system.
You must submit a Self Assessment tax return if you are:
A sole trader earning more than £1,000
A partner in a business partnership
An individual with untaxed income not covered by PAYE, such as rental income, investment income, or capital gains
The tax return provides HMRC with a full picture of your income and allowable expenses, forming the basis on which your tax liability is calculated.
Record-Keeping Requirements
To complete an accurate Self Assessment return, you must maintain appropriate records, including documentation relating to:
Income from employment
Benefits and other income from employment
Business income and expense records
Employee share schemes and share-related benefits
Savings, investments, and dividend income
Pension contributions and pension income
Rental income
Capital gains or losses arising on the disposal of assets
Overseas income
Maintaining complete and well-organised records is essential, not only for accurate reporting, but also to support figures in the event of HMRC enquiry or review.
Introducing MTD for Income Tax (From April 2026)
From April 2026, Making Tax Digital for Income Tax Self Assessment (MTD ITSA) will apply to self-employed individuals and landlords with qualifying income over £50,000. From April 2027, the rules will extend to those with income over £30,000.
Under MTD ITSA, affected taxpayers will be required to:
Keep digital records using MTD-compatible software
Submit quarterly updates of income and expenses
Submit an End of Period Statement (EOPS) for each business
Submit a Final Declaration replacing the traditional annual tax return
This represents a significant shift away from the current once-a-year reporting model.
What This Means in Practice
MTD ITSA does not change how much tax you pay, but it fundamentally changes how and when information is reported. Businesses will move from annual reporting to an ongoing compliance model, requiring:
More regular bookkeeping
Greater accuracy throughout the year
Digital systems capable of real-time reporting
For those who prepare records annually or rely heavily on spreadsheets, this will require a change in approach.
Deadlines and Payments
Under the current system, Self Assessment tax bills must be paid by 31 January following the end of the tax year (with payments on account where applicable). While payment deadlines remain unchanged for now, the increased reporting frequency means liabilities are likely to be more visible earlier, supporting better cash flow planning.
Returns can be submitted using commercial software or paper forms (paper filing is limited and subject to specific conditions).
The Value of Being Compliant
Early and proactive compliance delivers tangible benefits:
Reduced risk of penalties and late filing charges
Better visibility of tax liabilities throughout the year
Improved cash flow forecasting
Less stress at year end
Stronger audit trails and record integrity
MTD ITSA is designed to increase accuracy and reduce errors, but it also rewards those who adopt disciplined processes early.
How We Can Help
Transitioning to MTD ITSA requires more than software, it requires a structured approach to record-keeping, reporting, and review.
We support clients with:
Digital record-keeping setup
MTD-compliant software selection and implementation
Ongoing bookkeeping and quarterly submissions
End of Period Statements and Final Declarations
Full Self Assessment preparation and submission
By embedding compliance into day-to-day processes, we help clients stay ahead of deadlines, reduce risk, and approach their tax affairs with confidence.
If you need support with your Self Assessment tax returns or preparing for MTD ITSA, we can help you navigate the changes smoothly and effectively.