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 2026 service pack release v26.1.10.60

IRIS Personal Tax

Close Company Dividend Field Rejects Zero Value, Causing EMP7.3 Validation Error
The ‘Dividends that you received from this Close Company’ field in the Employment – Earnings screen was not accepting a value of £0.00, preventing box 7.3 from being populated and triggering an incorrect validation error “Close Company [EMP7.3] must be present if [SA102:Was this company a close company] equals ‘yes’”. 

IRIS Business tax

CT600 – Box 650 not completed for RDEC claims
When filing a CT600 for a small or medium-sized company with an RDEC claim, Box 650 was not being automatically populated. If Box 657 had been completed, this triggered an online filing error.

Outstanding issues

IRIS Business Tax

Multiple Trade Losses Brought Forward for Extended Period Incorrect 
Where a business has multiple trades and has an extended accounting period, the losses brought forward are incorrect for the 2nd CTAP.
Workaround 
There is no workaround for this issue.
This issue is due to be resolved in the Summer 2026 release.