I know just the basics when it comes to taxes and IRS. So I went to a tax professional to prepare my taxes. He filed my taxes electronically (e-file) and it was approved right there.

I double-checked the documentation before filing and signed it at his office. But when I came back home, I realized he added an expense for gas which is way over what I used last year for gas. I mean, it is an exaggeration - above $3000.00. I work from home, thus I had home-office deductions, and I do not use the car that much for business purposes.

I want to be honest and I want to correct this situation. I am guessing the tax professional made a mistake, but ultimately it is my responsibility to make sure the information is correct and I failed in this.

My question is - how should I correct this mistake? My return was already filed and approved. Appreciate it.