Income Tax Self Assessment (ITSA)
How to use Making Tax Digital for Income Tax in dynamik.app.
Income Tax Self Assessment (ITSA)
Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) requires self-employed individuals and landlords to submit quarterly updates to HMRC digitally.
Who Needs MTD for ITSA?
From April 2026, MTD for ITSA applies to self-employed individuals and landlords with a gross income above the threshold set by HMRC.
Connecting to HMRC
- Go to HMRC > Settings
- Click Connect to HMRC
- Sign in with your HMRC Government Gateway credentials
- Authorise dynamik.app to submit on your behalf
Quarterly Updates
You must submit quarterly summaries of your income and expenses:
| Quarter | Period | Deadline |
|---|---|---|
| Q1 | 6 April - 5 July | 5 August |
| Q2 | 6 July - 5 October | 5 November |
| Q3 | 6 October - 5 January | 5 February |
| Q4 | 6 January - 5 April | 5 May |
Submitting a Quarterly Update
- Navigate to HMRC > Income Tax
- Select the obligation period
- Review the auto-calculated income and expense totals
- Click Submit to HMRC
- You will receive a confirmation with a receipt ID
Business IDs
If you have multiple income sources (e.g. self-employment and property), each has its own HMRC Business ID. Manage these in HMRC > Income Tax > Business IDs.
End of Period Statement
After all four quarterly updates, you submit an End of Period Statement to finalise your annual figures.
Final Declaration
The Final Declaration replaces the traditional Self Assessment tax return. This confirms your total taxable income for the year.