According to the Manager Online website, the ID card allegedly used to register the taxable income belongs to a 77-year-old identified only as Mr Taweesak.
Revenue Department director-general Sathit Rankasiri yesterday said this would be a case of tax fraud if true.
The tax law says those who avoid paying their due taxes may be imprisoned for between three months and seven years and fined between 2,000 and 200,000 baht.
Ploy has not commented on the allegation. She only insisted she had paid her due taxes according to the law.