underreport
verb
(also under-report) uk/ˌʌndərɪˈpɔːt/ us [ I or T ] ACCOUNTING, FINANCE
to say that you have done, earned, sold, etc., less than you really have:
Some of the companies clearly underreport.
They underreported revenues to secure public money for new stadiums.
[ T ] TAX US
to record that you have earned less than you really have on your tax return (= a document in which income is reported each year so tax can be calculated):
He under-reported his income by $548,000.
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overreport