MTD for IT requires landlords to complete two different kinds of reporting: quarterly updates during the tax year and a Final Declaration after the year ends. They are not the same submission, and they do not require the same information.

Quarterly updates are cumulative summaries drawn from the digital records for the taxpayer’s MTD income sources: their UK property business, foreign property business and each sole-trader business. They contain income and expense totals for those activities. They do not require every figure, adjustment or source of income needed for the year-end tax return.

The Final Declaration is the year-end stage, when the taxpayer completes and submits their tax return through compatible software. It brings the MTD records together with tax and accounting adjustments, reliefs and allowances, and other taxable income or gains. This is where employment income taxed through PAYE, pensions, savings interest, dividends and other relevant income must be included if it has not already been added or supplied by HMRC.

This guide explains the difference between quarterly updates and the Final Declaration, what belongs at each stage, and how to avoid confusing a bookkeeping correction with a year-end tax adjustment.

What quarterly updates cover

Under MTD for IT, quarterly updates cover the income and expenses recorded for self-employment and property businesses. A landlord must therefore keep digital records for their UK property business and, where relevant, their foreign property business. A taxpayer who is also a sole trader must keep separate records and send a separate update for each sole-trader business.

Employment income taxed through PAYE, pensions, savings interest, dividends and other income that is not from property or sole trading do not form part of the quarterly updates. Some information may appear in an estimated tax calculation during the year because HMRC already holds it, and some software may allow other income to be added early. That does not make it part of a quarterly update. HMRC’s tax-return guidance requires all taxable income sources and gains to be included and checked before the Final Declaration is submitted.

Each digital record normally includes the amount, date and appropriate category. Those records are then summarised in quarterly updates sent through compatible software.

HMRC’s quarterly-update guidance confirms that the figures are cumulative. The second update, for example, covers the tax year from the start through to the end of the second update period, rather than only the latest three months.

Quarterly updates are based on the digital records available at that point. They are not intended to include every decision or every income source needed to calculate the final tax bill. HMRC says that once the fourth update has been sent, a taxpayer may still need to adjust the data before completing the Final Declaration.

That year-end stage can include reliefs and allowances, disallowable costs, capital allowances and accounting adjustments. Other sources of income and gains may also need to be added before the return is submitted.

Why the quarterly figures may differ from taxable profit

The income and expenses recorded during the year are the starting point for working out taxable property profit, not necessarily the final answer.

A payment appearing in a bank account does not establish its tax treatment by itself. A cost may be wholly allowable, partly allowable, capital rather than revenue, or subject to a special rule. A relief may be claimed only after the records for the year are complete.

This is why an estimated tax figure shown during the year can change. It may be based on incomplete information and may not yet reflect:

• personal or capital elements within recorded costs;
• property or Rent-a-Room allowances;
• capital allowances;
• residential finance-cost restrictions;
• losses or other income;
• accruals or prepayments where traditional accounting is used; or
• corrections made later in the year.

Treat an in-year estimate as a developing indication, not a guaranteed tax bill.

Corrections and adjustments are different

The clearest way to understand the year-end process is to separate two kinds of change.

Correcting an error

A correction fixes a record that is factually wrong or incomplete. Examples include:

• omitted rent;
• a repair recorded twice;
• an expense assigned to the wrong category;
• a personal payment included by mistake; or
• a payment allocated to the wrong property business.

HMRC says errors in digital records should be corrected as soon as possible. Because quarterly updates are cumulative, the corrected year-to-date totals can usually flow through the next update without reopening each earlier quarter.

If an error is found only after the fourth update, HMRC says that update may need to be resent so the digital records are brought up to date before the tax return is filed.

Making a tax or accounting adjustment

An adjustment starts with a genuine transaction but changes how it is treated for the annual tax calculation.

For example, a landlord might have recorded the full amount of a mixed-use expense during the year. At year end, the annual category total may need to be reduced so that only the business element is claimed. Alternatively, the landlord may have recorded a payment that includes both capital and revenue elements and must remove or reclassify the capital element.

HMRC’s year-end adjustment guidance says most adjustments are made by changing the annual total for an expense category in the software. It is not always necessary to edit every individual transaction.

The precise method depends on the software and the nature of the adjustment. Where the tax treatment is uncertain, the transaction should be flagged for an accountant.

Disallowable and mixed-use expenses

An expense is not automatically deductible because it relates loosely to a property or appears in a property bank account.

HMRC’s digital-record guidance allows several approaches where a cost contains a disallowable part. A landlord can record only the allowable portion, record the total and the disallowable portion separately, or record the total and adjust the relevant annual category before submitting the tax return.

Suppose a £240 bill relates 75% to the property business and 25% to private use. Depending on the bookkeeping approach supported by the software, the records might show the £180 business portion from the outset. Alternatively, they might show the full £240 during the year, followed by a £60 year-end adjustment.

The aim is the same: the final tax return should not claim the private element.

This does not mean landlords can ignore expense records until year end. The underlying transactions still need to be captured in a way that supports the quarterly updates and the eventual adjustment.

Capital and revenue elements

Some payments contain more than one tax element.

HMRC uses a mortgage payment as an example. It may include both repayment of capital and interest. Its guidance says a taxpayer can record the interest element, or record the full payment and make an adjustment before finalising the Income Tax position.

For an individual letting residential property, finance costs are subject to specific rules and generally do not operate like an ordinary deduction from rental income. The HMRC property income manual explains that qualifying residential finance costs may instead contribute to a basic-rate tax reduction, subject to statutory limits. The outcome can depend on the type of property business, ownership structure, profit and the landlord’s wider income.

The practical lesson is not to categorise an entire mortgage payment as a normal property expense. Record enough information to distinguish interest, fees and capital repayment, and obtain advice where the treatment is unclear.

The same principle applies when a single invoice combines repair work with an improvement. Whether expenditure is revenue or capital depends on the facts, not the invoice label alone.

Cash basis and traditional accounting

For many individual landlords, the cash basis is the default way of calculating property business profit. Broadly, income and expenses are recognised when money is received or paid.

HMRC’s cash-basis guidance for landlords explains that the cash basis does not apply in every case. For example, exclusions can apply because of the person or entity running the business, the level of receipts or an election to use generally accepted accounting practice.

If the cash basis applies, there is normally no need for year-end adjustments for prepayments and accruals. If traditional accounting is used, income and expenses may need to be matched to the period in which they were earned or incurred.

HMRC gives the example of an annual insurance payment. Under traditional accounting, part of the payment may relate to the current tax year and part to the next. The software may therefore need an adjustment to allocate the cost between years.

Do not assume that a transaction needs an accrual simply because it spans two periods. First establish which accounting basis applies to the property business.

Reliefs and allowances

Some annual claims are made as part of finalising the tax position rather than through each quarterly update.

For example, HMRC says a landlord using the property income allowance should keep the required digital records during the year and claim the allowance when submitting the tax return through compatible software. Whether the allowance is beneficial depends on the landlord’s circumstances and the expenses they would otherwise claim.

Rent-a-Room relief has separate rules. It applies to qualifying furnished accommodation in a person’s only or main home, and the annual limit can be reduced where someone else receives income from the same accommodation. HMRC’s Rent-a-Room guidance explains the available methods and conditions.

The quarterly records should preserve the information needed to make the right choice later. Do not suppress income from the digital records merely because a relief may ultimately reduce or eliminate the taxable amount.

Capital allowances

Capital allowances can provide tax relief for certain qualifying capital assets. They are not the same as recording an ordinary repair or running cost.

HMRC says a capital allowance claim must be recorded through the software before the tax return is submitted. The software may allow the claim to be entered during the year, but HMRC does not process it until the tax return is filed.

This is another reason why the quarterly totals and final taxable profit may differ. If a significant purchase could be capital, keep the invoice and description, record it consistently and ask for advice before treating it as a routine expense.

Jointly let property has a specific exception

Landlords with jointly let property can choose not to include their share of the related expenses in quarterly updates. That exception does not apply to expenses for property they own entirely.

If the joint-property expenses are left out during the year, they still have to be added before the tax return is submitted. HMRC’s current digital-record guidance gives two routes: resend the fourth quarterly update after the tax year, or adjust the annual category totals in the software and update the digital records.

This is different from making a tax adjustment to an expense that was already recorded. In the joint-property scenario, the omitted expense information itself must be added to the records before the return is filed.

A practical year-end workflow

The annual process should be a controlled review of the records, not a reconstruction of the entire year.

After the fourth quarterly update, work through these steps:

1. Reconcile the records. Compare rent, bank activity, letting-agent statements, invoices and receipts with the digital ledger.
2. Correct factual errors. Add missing transactions, remove duplicates and fix incorrect dates, amounts or categories.
3. Review flagged items. Examine mixed-use costs, large repairs, improvements, mortgage payments and anything whose tax treatment was deferred.
4. Confirm the accounting basis. Establish whether the property business uses the cash basis or traditional accounting.
5. Make annual adjustments. Use the software to deal with disallowable amounts, capital or revenue splits, accruals, prepayments or accounting-period issues where relevant.
6. Add reliefs and claims. Consider allowances, capital allowances, losses and other claims supported by the records.
7. Complete the Final Declaration. Add employment income taxed through PAYE, pensions, savings interest, dividends, other income, gains and any relevant information not contained in the property or sole-trader quarterly updates. Check figures supplied by HMRC rather than assuming they are complete.
8. Review the final calculation. Check that the return reflects the records and the intended tax treatment before submitting it through compatible software.

Keep a note of important decisions and the evidence behind them. This is particularly useful where an accountant makes an annual adjustment but the landlord maintains the underlying digital records.

The key takeaway

Quarterly updates provide cumulative income and expense totals for UK property, foreign property and sole-trader businesses during the year. They are not the Final Declaration and do not include the taxpayer’s complete income picture.

Correct bookkeeping mistakes as soon as they are found. Reserve genuine tax and accounting adjustments for the year-end process, when the complete records are available and the Final Declaration is being prepared. PAYE income, pensions and other taxable income or gains must be included and checked before that declaration is submitted, even though they are outside the quarterly updates.

The better the digital records are during the year, the smaller and clearer that final review should be. Landlords who want a structured way to maintain property records and prepare MTD updates can explore Hammock’s landlord accounting platform.