Iowa Code § 420.241: Deed — when executed.

Immediately after the expiration of ninety days from the date of service of the notice, as prescribed by sections 447.9 through 447.14 and section 448.1, the treasurer, collector, or person authorized to act as collector of taxes, shall make out a deed for each lot or parcel of land sold and remaining unredeemed and deliver the same to the purchaser upon the return of the certificate of purchase.