Business Tax- Box L45 must equal the lesser of box L25 and L40. If L25 is not completed then Box l45 must equal 0

business-tax-box-l45-must-equal-the-lesser-of-box-l25-and-l40-if-l25-is-not-completed-then-box-l45-must-equal-0

Business Tax- Box L45 must equal the lesser of box L25 and L40. If L25 is not completed then Box l45 must equal 0

7th July 2022

IRIS Business Tax: Box L45 must equal the lesser of box L25 and L40. If L25 is not completed then Box l45 must equal 0

This is linked to your RDEC entries.

First ensure you are on the latest IRIS version – help and about

Open the RDEC and look at all the values
There may be a £ value difference on the RDEC credit claim (Eg £12372 on the very top middle) compared to all 3 boxes with similar value (eg one may show £12373) – you will need change all so they are the same value (they all need to match or you get the L45 error) . This is caused by users manually overriding all or one of the options on the 3 areas.

If you still have the same issue if all the values match then it can be a rounding issue

You may have a penny values on RDEC credit calculation eg £1000.71
Can you change the RDEC qualifying expenditure to a figure that calculated the tax credit as a whole figure like £1001 and also ensure all other similar boxes have the same £1001 value.
If you don’t have a RDEC entry but you have R&D entry – make the same edit there as well to the credit claim.