Incorrect second payment on account

When the previous year's tax liability has odd pence, the second payment on account should be 1p more than the first and will appear as such on the HMRC website and all their issued statements.

However, our software (IRIS) shows the second payment as identical to the first.  When I took this up with them, they told me that their software is required to comply with the result produced by the HMRC test case generator and IRIS have demonstrated to me that the HMRC test case generator does indeed produce two identical payments on account for the example which I gave them.

Why on earth would HMRC produce and force third party software providers to adopt a system which they know to be wrong and which HMRC "corrects" as soon as they receive the tax return?

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