False/Inflated Income and Expenses. Falsely claiming income you did not earn or expenses you did not pay in order to get larger refundable tax credits is tax fraud. This includes false claims for the Earned Income Tax Credit. In many cases the taxpayer ends up repaying the refund, including penalties and interest. In some cases the taxpayer faces criminal prosecution. In one particular scam, taxpayers file excessive claims for the fuel tax credit. Fraud involving the fuel tax credit is a frivolous claim and can result in a penalty of $5,000.