Iowa Code § 633.272

If part but not all of the estate of a decedent is validly disposed of by will, the part not disposed of by will shall be distributed as provided herein for intestate estates. If the testator left a surviving spouse, and the spouse does not take an elective share, the spouse shall receive, in addition to the property given to the spouse by the will, so much of the intestate property subject to the payment of its proportionate share of debts and charges as the spouse would receive pursuant to section 633.211 or 633.212.

94 Acts, ch 1165, §42; 2007 Acts, ch 134, §12, 28