When do the IRS send refund checks in the mail?

The IRS typically sends refund checks in the mail within 21 days of processing a tax return if it was filed electronically and there are no issues. For paper returns, refunds may take longer, potentially up to six weeks or more. Refunds are sent via mail if the taxpayer chose to receive a paper check instead of direct deposit. It's important to check the IRS website or use the "Where’s My Refund?" tool for specific updates on individual refunds.