Unless you used certified mail with a return receipt requested or some other mailing service such as Fedex with a tracking number, you cannot track your mailed return. Wait about 4 weeks and then check its status on the IRS site:
To track your Federal refund:
https://www.irs.gov/refunds
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
