Making Tax Digital for Income Tax is now live for sole traders and landlords whose qualifying income exceeded ÂŁ50,000 in 2024/25. HMRC reported that 436,000 taxpayers were within the first mandatory group from April 2026, making the year end process an immediate priority rather than a future change.
The final declaration is the last confirmation within your MTD tax return. It brings together your final business or property figures, other taxable income, gains, reliefs and allowances so HMRC can calculate your actual Self Assessment liability.
What Is an MTD Final Declaration?
HMRC now uses the term tax return for the complete year end process. The final declaration is the last step, where you confirm that the information submitted is correct and complete to the best of your knowledge.
It is not a fifth quarterly update. Quarterly updates provide cumulative summaries of income and expenses for each sole trade and property business. The tax return then corrects and finalises those figures, includes income and gains outside MTD, claims relevant reliefs and produces the final tax calculation.
Older guidance may mention an End of Period Statement. That separate requirement was removed because it duplicated information in the final declaration, so the current process consists of four quarterly updates followed by one year end tax return and final declaration.
Who Must Make One?
For 2026/27, MTD for Income Tax generally applies to an individual who is registered for Self Assessment, receives income from self employment or property, and had qualifying income over ÂŁ50,000 in 2024/25. The threshold falls to over ÂŁ30,000 from April 2027 and over ÂŁ20,000 from April 2028.
Qualifying income means gross income before expenses from self employment and property combined. It is not taxable profit. Limited companies are outside MTD for Income Tax, while exemptions can apply in defined cases, including qualifying digital exclusion.
Final Declaration Deadline
The tax return and final declaration must be sent by 31 January after the tax year ends. Therefore, the first mandatory MTD tax return for 2026/27 must be submitted by 31 January 2028 through compatible software.
The fourth quarterly update is normally due by 7 May following the tax year, but this does not complete the annual return. Tax payment dates are unchanged, so the balancing payment and any first payment on account are normally due on 31 January, with the second payment on account due on 31 July.
Prepare Before Submission
Do not simply approve the totals carried forward from quarterly updates. Complete a proper year end review first.
- Confirm that all four quarterly updates have been sent for every relevant self employment and property income source.
- Reconcile bank activity, rent statements, invoices, receipts and agent statements to the digital records.
- Correct omitted, duplicated or wrongly categorised transactions in the software.
- Review private use and disallowable expenditure, capital items, losses, allowances and relief claims.
- Gather details of employment, pensions, benefits, savings interest, dividends, partnership income, capital gains, pension contributions and charitable donations.
- Check any figures inserted from HMRC records rather than assuming they are complete.
HMRC may add PAYE income, pensions, taxable state benefits, CIS deductions, student loan information and certain residential property disposal data. You remain responsible for checking those figures and adding missing items such as savings interest, dividends, partnership profit and other gains.
Property Tax Checks
Landlords should pay particular attention to gross rent, letting agent deductions, repairs, improvements, finance costs and jointly owned property. The digital record should show gross income and the related expense rather than only the net amount received from an agent.
Ordinary repairs, insurance, management fees and other costs incurred wholly and exclusively for the property business may be deductible. Improvements are generally capital, while residential mortgage interest is not deducted from rental profit and may instead qualify for a basic rate tax reduction.
The ÂŁ1,000 property allowance is an alternative to deducting expenses and other allowances. It should not be claimed automatically because actual expenses may produce a better result, particularly where costs are high.
For jointly owned property, each owner normally reports their own taxable share. Joint ownership alone does not automatically create a partnership, and the allocation may depend on ownership and whether the owners are spouses or civil partners.
Make Year End Adjustments
After the fourth update, use the software to adjust the annual totals. Typical adjustments include removing non-allowable costs, restricting mixed personal expenditure, recording capital allowances, claiming property or trading allowances, accounting for losses, and making accrual or prepayment adjustments where traditional accounting is used.
Cash basis is the default method for self employment and property income, so accrual and prepayment adjustments are not normally needed under cash basis. Where the accounting period does not match the tax year, additional adjustments may be required before submission.
A common landlord error is entering the full mortgage payment as an expense. Capital repayments are not deductible, and residential finance costs require separate tax treatment. Another common error is treating refurbishment that improves a property as a repair, which may overstate the deduction.
How to Submit
The exact screen names differ between software products, but the submission process should follow these steps:
- Open the relevant tax year in your HMRC recognised MTD software.
- Confirm that every income source has a complete fourth quarterly update.
- Review and correct the annual figures for each sole trade and property business.
- Enter all other taxable income, capital gains, losses, reliefs and allowances.
- Request the final Self Assessment calculation from HMRC through the software.
- Check the calculation, tax bands, payments on account, student loan position and any tax already deducted.
- Read the declaration and confirm that the return is correct and complete to the best of your knowledge.
- Submit through the software and retain the successful submission confirmation.
HMRC requires the MTD tax return to be submitted through compatible software, not through the old online Self Assessment filing route. The software should display confirmation when HMRC accepts the submission.
Where an accountant submits the return, only the main agent can make the final submission. The agent should share the completed return and calculation with the client, obtain written approval, and then make the declaration on the client’s behalf.
Common Submission Problems
- Incomplete other income: Quarterly updates do not include every source of taxable income, so dividends, interest, employment and gains may still need attention.
- Software connection failure: Check that the software is connected to the correct HMRC account and covers every required income source. Contact the software provider first if a technical issue prevents submission.
- Figures differ from HMRC data: Compare PAYE, pension, CIS and student loan figures with P60s, statements and tax records before accepting them.
- Wrong property treatment: Review repairs against improvements, finance cost relief, ownership shares and the choice between actual expenses and the property allowance.
- Assuming filing pays the tax: Submission and payment are separate actions. Check the HMRC account and arrange payment by the relevant deadline.
After You Submit
Save the submission receipt, final calculation, client approval where relevant, and a copy of the return. Digital records must generally be retained for at least five years from the submission deadline.
If an error is discovered, amend the return through compatible software. HMRC allows changes within 12 months of the original submission deadline, and the updated calculation should then appear in the HMRC online account.
Late submission can produce a penalty point under the MTD penalty regime, while late payment can lead to penalties and interest. Filing early provides time to resolve discrepancies and plan for the January payment.
How UK Property Tax Accountants Can Help
UK Property Tax Accountants can manage the accounting review and MTD submission process for landlords with simple or complex portfolios. The aim is to produce an accurate return, claim valid reliefs and reduce the risk of missed income, incorrect expenses or late filing.
- Review and reconcile rental records, letting agent statements and finance costs
- Correct quarterly data before the tax return is finalised
- Assess repairs, capital improvements, ownership shares and property allowances
- Include employment, dividends, interest, gains and other taxable income
- Review losses, reliefs, payments on account and the final tax calculation
- Obtain approval and submit the MTD tax return as the authorised main agent
- Maintain a clear compliance calendar for quarterly updates and annual deadlines
Frequently Asked Questions:
Is the final declaration the same as a Self Assessment return?
It is the final confirmation within the MTD tax return and completes the taxpayer’s annual Self Assessment position. HMRC advises using “tax return” for the whole process and “final declaration” only for the last confirmation step.
Can the final declaration be submitted on the HMRC website?
No. Once a taxpayer is within MTD for Income Tax, the tax return must be submitted through compatible software.
Do quarterly updates calculate the final tax bill?
No. They provide in year summaries and estimated information. The final liability is established after annual adjustments, other income, gains, allowances and reliefs are included in the tax return.
Can an accountant submit it?
Yes. An authorised main agent can submit after sharing the information and calculation with the client and obtaining written confirmation that they are correct and complete.
What if a mistake is found after submission?
The return can normally be amended through compatible software within 12 months of the filing deadline.
Does the final declaration also pay the tax?
No. Filing generates the Self Assessment bill, but payment must be made separately by the normal due date.
