You have filed your taxes and here it is…that brown envelope appears in your mailbox. It’s your notice of assessment. Maybe all is well and your tax return has been accepted exactly how it was filed, all is well and everyone can go on living their lives exactly like before that brown envelope was opened. But what if there is bad news in that brown envelope. What does it mean if CRA has decided to disallow a good chunk of your employment expenses? Why do you owe money back to CRA? What can you do?