IRIS Important Known Issues
It is important to us that we resolve any problems that are found in the IRIS Accountancy Suite.
If your problem is listed below, we are working hard to resolve these as quickly as possible.
Issues that have been fixed or are due to be fixed in the next release, are identified as such.
For information on the next release dates, click here.
Issues resolved in the Spring release v25.1.0
IRIS Personal Tax
Transitional profits aren’t being calculated where the accounting period has been extended to 31/03 – 05/04
When there was a 5th April year end 2024, the period was not liable for any Transition Profits.
However, we were aware that there were some instances where the current year end had been extended to a long period that ended 31st March-5th April 2024, and then the transition profits weren’t calculated.
IRIS Business Tax
HMRC Filing Error
An HMRC filing error displayed for a user that tried to file a return when a RDEC claim with Box 657 is ticked.
Outstanding issues
IRIS Accountancy Suite ‘crashing’ in certain windows
When accessing certain windows in IRIS you may experience a crash. This is most notable in Personal Tax when accessing the UK Land and Property page. It also occurs when accessing the WIP tab in the Business Client Maintenance screen.
This is due to an older version of Microsoft C++ 2015-2022 (x86) on your system.
To resolve, please update the program using the latest version from Microsoft which you can find here.
IRIS Personal Tax – Basis Periods
Self-Employment has a change of account period in 2025, and return is rejected with error 6492
Sole Trade for 2025 has a change of accounting period which has resulted in two account periods ending in 2025. The internet return is rejected with error 6492
Workaround
You are advised to remove any profit/(loss) for a later period; to tick the opt out box and manually enter the Box 68 adjustment in the UI.
This issue is due to be resolved in the Spring service pack.
Transition profit is being added to farmer’s averaging against the 2024 profit column
In the 2024 tax year, the transition profit is being added to the profit column in the ‘Adjustment for farmers’ or creative averaging’ screen.
Workaround
You are advised to manually adjust/remove the value.
This issue is due to be resolved in the Spring service pack.
Offset boxes for loss brought forwards are not saving the values for Tax Year 2025
Self-employment in 2025, has a profit in the year and a loss brought forwards.
In addition to the above, the override boxes don’t retain the tick and any manually entered values within the offset against transitional profit or against transitional profit are not saved.
This issue is due to be resolved in the Spring service pack.
Transitional loss disappears with using farmers averaging for Tax Year 2024
Box 21 is not being populated when a negative farmers averaging adjustment creates a loss.
Workaround
You are advised to enter the farmers averaging value into the adjustment field and enter a note onto the return. This will generate the correct value in box 21.
This issue is due to resolved in the Spring service pack.
Accelerated transition profit field is incorrectly automatically completed after the bring forward
In 2025 after doing the bring forward on the Transitional Profits screen the Accelerated transition profit field is incorrectly automatically completed. This affects both sole traders and partnerships.
Workaround
You are advised to remove the figure from the Accelerated transition profit field.
This issue is due to be resolved in the Spring service pack.
IRIS Business Tax
Tonnage tax
Qualifying ship entry does not save within Computation of Tonnage Tax profits after deleting previous record.
Workaround
You are advised to close and re-open the Computation of Tonnage Tax screen and add record to save the record.
This issue is due to be resolved in the Spring service pack.
Assets moved to Special Rate Pool
In Business Tax Capital Allowances, when an existing asset is re-opened IRIS automatically assigns it to the special rate pool, even if it was originally entered into the general rate pool. This happens every time on reopening an asset and causes the tax treatment to be incorrect.
Workaround
Manually un-check the box and switch it back to the general pool.
This issue is due to be resolved in the Spring service pack.
CT600P-Creative Industries
A new supplementary page has been added for the CT600P-Creative Industries to provide more details on where a company is part of creative and audio-visual industries on the expenditure and audio and visual expenditure credits to calculate the corporation tax charge.
Due to a late change from HMRC, the submission of the CT600P will be postponed to April 2026.
For further information please click here.
Currently a submission for Creative Tax credits cannot be made. An update will be available in the next release, to allow for creative tax credit submission for April 2025.
