According to the IRS website What to expect for Refunds This Year more than 9 out of 10 refunds are issued in less than 21 days after the IRS accepts the tax return when you e-file and choose direct deposit as your refund choice. Where’s My Refund? has the most up to date information available about your refund. The tool is updated daily (usually overnight) so you will just usually need to check once a day.
For more on the timing of your refund please see this TurboTax FAQ.
If you are anticipating a state tax return refund those processing times vary from state to state. To check on a state refund please visit your state Department of Revenue refund tracking website.
If it has been over 21 days see these TurboTax FAQ's on why some tax return refunds may take a while to be released and what steps you can take:
If you are concerned and it's has been over the 21 days since your tax return was accepted by the IRS and you decide to call them here are some tips when contacting the IRS at 1-800-829-1040, but do expect long wait times:
Also this TurboTax FAQ lets you know what to have ready before you contact the IRS: https://ttlc.intuit.com/community/irs/help/what-do-i-need-if-i-call-the-irs/00/27378
If you are anticipating a state tax return refund those processing times vary from state to state. To check on a state refund please visit your state Department of Revenue website.