IAS – MTD Quarters for AP to BT to PT workflow

ias-mtd-quarters-for-ap-to-bt-to-pt-workflow

IAS – MTD Quarters for AP to BT to PT workflow

20th May 2026

How to enter income/expense data for: as a example a Sole Trader- so it shows in AP, then to BT and then to PT for the clients MTD quarters

Accounts Production → Business Tax → Personal Tax Workflow Guidance. To ensure data flows correctly across modules, it is important to follow the correct process and understand how information transfers between systems.

1. Correct Setup Order

• Begin by creating the set of accounts in Accounts Production (AP).
• Once completed, open the client in Business Tax (BT).
• From there, click ‘refresh the data’ into Personal Tax (PT).
• Load the Client in PT and check

Important: Data flows one way only:

Accounts Production → Business Tax → Personal Tax
There is no data flow from Personal Tax back to Accounts Production.

2. Importance of Dates in Accounts Production

• The accounting period dates set in AP are critical.
• These dates determine how quarterly periods are identified and processed.
• Incorrect dates may lead to amount in the wrong quarters

3. Handling Quarterly Data

There are two ways quarterly figures can be populated:

Option A – Enter Data in Accounts Production (Recommended)

• Enter quarterly figures directly into AP and ensure the date falls within the relevant MTD quarter.
• This removes the need to import CSV files later.
• The data will automatically flow through to BT and PT.

Option B – Import CSV Files into Personal Tax

• If CSV files are imported into PT:
  • You must still go back into AP and enter the corresponding postings.
  • This ensures consistency, as PT does not push data back to AP.

4. Refreshing Data and Risks

• Refreshing PT after importing CSV files may overwrite existing data in the accounting period. Therefore if you are importing CSV files into Iris Personal Tax we recommend not refreshing in Business Tax to Personal Tax
• However:
  • If quarters have already been submitted, they will not be overridden in the Digital Tax Hub, however if they have not been finalised and submitted they will be overridden.

5. Scenario: User Has Imported 3 CSV Files

If a user has already imported 3 quarters via CSV and needs to create accounts:

Best Practice:

1. Import the 4th quarter CSV file.
2. Submit all quarters.
3. Then proceed to prepare the accounts.

Why?

• Entering Quarter 4 directly in AP after importing earlier CSVs may overwrite or conflict with previously submitted data and adjustments.

Key Points:

• Always follow the correct flow: AP → BT → PT.
• Set accurate accounting dates in AP.
• Prefer entering quarterly data in AP to avoid inconsistencies.
• Be cautious when refreshing PT after CSV imports.
• Complete all quarters before preparing accounts where possible.