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Account type Timing of first RMD
IRAs including traditional, SEP, and SIMPLE By April 1 of the following year after reaching RMD age. 
401(k), 403(b), 457(b) plans, or other qualified plan By April 1 of the following year after reaching RMD age. However, if you are still employed, you may be able to delay your first RMD until April 1 of the year after you retire. A few other caveats apply: The exemption applies only to the account for your most recent employer, the plan must allow this exemption, and you cannot own more than 5% of a business. 
Roth IRA RMDs are NOT required.
Roth 401(k), 403(b), or 457(b) (designated Roth account) RMDs are NOT required.
Inherited retirement accounts If the deceased has not taken their RMD, you must generally take a distribution for them by December 31 of the year of death. If the heir of the account is of RMD age, they might also be subject to their own RMDs. The RMD rules for inherited accounts are very complex.* 
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Disclosures

*You can learn more about the rules for inherited IRAs here. Source: IRS. For illustrative purposes only.