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Tax Return- HMRC programming corrupts SEISS figures.

HMRC struck with technological difficulties, inflating figures reported on self-assessment returns by recipients of self-employed income support (SEISS) grants.

During the past week, reports have been streaming in about a bug in HMRC’s self-assessment application programming interface (API) that is corrupting figures entered on 2020-21 returns for SEISS grants.


It is confirmed that the software program was not an isolated incident affecting one person. Many members were affected and have confirmed several cases from their customers.


HMRC have advised that customers “check the pre-populated SEISS entry and where necessary, delete the pre-populated figure and manually enter the correct amount. Our system will not process a return if the SEISS grant entry does not match our record of the amount paid”






Stokdyk, J., 2021. Tax return data feeds misreport SEISS figures. [online] AccountingWEB. Available at: <https://www.accountingweb.co.uk/tax/personal-tax/tax-return-data-feeds-misreport-seiss-figures> (Accessed 26 August 2021).

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