According to the IRS.gov website, this outlines the topic regarding Interest on refunds which is often asked at IGMR. You can connect here with other people and share your comments and experience regarding interest on refunds if you have not received it within 45 days after the date on your return.
Interest on Refunds
If the refund is made within 45 days after the due date of your return, no interest will be paid. If you file your return after the due date (including extensions), no interest will be paid if the refund is made within 45 days after the date you filed. If the refund is not made within