After you file

The most that you could get would be a reimbursement of any interest and penalty.   You would have owed the tax anyway (or not have received the refund that you must now pay back) had the return been properly filed.   As stated above, you should first talk to the manager of the tax place about it.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**