It's wrong to cheat on your taxes.
Peter realizes that Tax Day is coming up, and he hasn't filed yet.
Peter wants to complete his tax return.
Peter fills out his tax return, reporting all of his income and only taking credit for deductions he has receipts for.
Peter fills out his tax return but doesn't include all of his income and takes credit for numerous deductions he hasn't earned.
Peter receives a refund from the IRS and deposits it in his savings account.
Peter gets audited by the IRS and has to pay interest and penalties when his taxes are recalculated.