I know of someone who has been married for about 4 years....She has three children from a previous marriage....Since she has been married she still files her tax return as single....Instead of marking married...or married filing seperate....She marks single.....This is fraud isn't it....Because she would be getting more in her refund by filing single other then letting the government know that she is married and he lives in the house and is helping to support these children that are not his....Please tell me if this is illegal....And please tell me what can be done about this ....Who can you notify to report something like this ....What is the name of your state? Pa.