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 Autumn release (v25.4.0)
IRIS Personal Tax
Partnerships profit issue with Incorrect use of days
The partnership profit share for the 2024/25 is being miscalculated for the tax year due to the incorrect use of days. The software was not considering the partnership ceased date, causing inaccuracies in the calculations for the 2025 tax year.
User is getting error message 6492 when offsetting losses against other income
When offsetting losses against other income the adjustment to Class 4 NIC was not being sent to HMRC and as a result an error displayed.
IRIS Business Tax
Description of specific posting for disallowed expenses on partnership trade computation is incorrect
When making a posting entry in for a partnership the description was incorrectly being displayed in the trade computation. The tax return remained unaffected.
Issues resolved in the Autumn release (v25.3.0)
IRIS Personal Tax
SEIS relief is still being restricted to £100,000
The SEIS amount of relief limit has changed from £100,000 to £200,000. IRIS was restricting the amount of relief to £100,000.
Partnership loss offset against other income is not appearing on the tax computation
When a partnership is ceased, a loss appeared on the trade computation. The loss offsets against other income on the data entry screen however when running the tax computation, it didn’t appear under Income tax relief.
IRIS Time & Fees
Ex VAT column for Invoices showing incorrect figure
When generating a Fees postings list including invoices, the Ex VAT column was calculating incorrectly for each invoice line, however the total was correct.
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 Spring 2026 release.