TaxSimba — Are MTD Quarterly Updates Cumulative? A Simple Worked Example
Preparation worksheet

This is an optional offline planning aid, not a tax return or a filing confirmation.
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PRACTICAL TASK
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.

Outcome to confirm: ____________________
Evidence or reference: ____________________
Person responsible and next check date: ____________________

1. Business and accounting-period setting
Notes: ______________________________

2. First-period income and expense totals
Notes: ______________________________

3. Additional-period records
Notes: ______________________________

4. Corrections affecting earlier records
Notes: ______________________________

5. Year-to-date reconciliation and confirmation
Notes: ______________________________

Actions agreed with accountant:
____________________________________

Guide: https://taxsimba.co.uk/blogs/mtd-cumulative-quarterly-updates

Check the current guide and official sources before relying on a deadline or process.