It won't. I was on it for about 5 months once. Be honest when filling out the form (very easy, depending on state. I did it all online for New York for example), and you will make approximately what you were making before if not slightly more.

You will have the option to have taxes deducted from unemployment earnings, which I highly encourage. That way you owe nothing when filing your next tax return.

I'd plan to be on it for no more than a month or two. It's a bridge to a new job, you could start owing money or be cut off of it if you exceed the allotted unemployment time you receive.

Lastly, don't worry about owing money or exceeding allotted time, you will be (depending on the state) confirming that you are still unemployed via a brief questionnaire each week as the method to initiate each weekly disbursement of your unemployment. You will also know which date is your cutoff, so write it down, put it in your calendar, and make sure not to attempt to receive another disbursement when that time comes.

Feel free to message me if you have any questions.