Yes. Each MTD update covers the tax year so far. If income is £12,000 in the first period and £15,000 in the second, the second update reports £27,000 of cumulative income—not another standalone £15,000. Expenses must also reflect the correct year-to-date records.
Quarterly activity and submitted totals are different
| Update | New income in the period | Cumulative income submitted |
|---|---|---|
| First | £12,000 | £12,000 |
| Second | £15,000 | £27,000 |
| Third | £9,000 | £36,000 |
Do not add £12,000, £27,000 and £36,000 to find annual income. That would count earlier activity more than once. The example leaves out expenses and is not a personal tax calculation.
Read the start date as well as the end date
For standard periods, the second update covers 6 April to 5 October. The third runs from 6 April to 5 January. Calendar periods have different coverage dates, so check which basis the software uses before comparing it with a bank export.
Why a correction can change the next update
Once an earlier transaction is corrected in the digital records, the next cumulative update needs to reflect the corrected year-to-date position. Ask the accountant which action is needed at the stage you have reached; do not assume the answer is always a separate resubmission.
Before you approve
Match the business, tax year, period and category totals to the records for the whole cumulative period. If you changed accountants, provide the earlier records as well. See correcting an MTD mistake if the figures do not reconcile.
Add expenses to the example
Suppose earlier cumulative income was £12,000 and expenses were £3,000. New-period income is £15,000 and expenses are £4,000. Before corrections, the next totals are £27,000 income and £7,000 expenses. If £240 of the earlier expenses was private and must be removed, cumulative expenses become £6,760.
The calculator below lets you change those numbers. Enter a correction only once. If the starting cumulative expenses already exclude the £240, subtracting it again would create a second mistake.
A cumulative update in numbers
Illustrative example.
Assume standard periods and one business. By 5 July, the records show £10,000 income and £3,000 expenses. From 6 July to 5 October, the business records another £8,000 income and £2,000 expenses. The second update covers the tax year so far: £18,000 income and £5,000 expenses, assuming no corrections.
Do not enter £18,000 as fresh transactions on top of the earlier £10,000. The software should build the cumulative totals from the underlying records. These figures illustrate record aggregation only; they are not a final taxable-profit or tax-bill calculation.
| Check | Practical action |
|---|---|
| First update: 6 April–5 July | Income £10,000; expenses £3,000. |
| Additional records: 6 July–5 October | Income £8,000; expenses £2,000. |
| Second update: 6 April–5 October | Income £18,000; expenses £5,000. |
Do I add the first two submitted totals together?
That would count the first period twice. Compare underlying records and the cumulative period covered by each update.
What if I use calendar update periods?
Confirm the elected periods in your software. This example uses standard periods and should not be copied without checking the period settings.
Download a checklist for this guide
- Business and accounting-period setting
- First-period income and expense totals
- Additional-period records
- Corrections affecting earlier records
- Year-to-date reconciliation and confirmation