The IRS says: “For the year of the account owner’s death, use the RMD the account owner would have received. For the year following the owner’s death, the RMD will depend on the identity of the designated beneficiary.” If you are the designated beneficiary, as a surviving spouse you can choose to roll over the account to your own and figure RMDs for your own account.
Advance payment of current tax liability based either on wage withholdings or installment payments of your estimated tax liability. To avoid penalties, you generally must pay to the IRS either 90% of your final tax liability, or either 100% or 110% of the prior year’s tax liability, depending on your adjusted gross income.