McIver dropped off 500 signatures from party members and paid the balance of a $50,000 non-refundable deposit.
He joins former Calgary MP Jim Prentice as the second official candidate in the contest to replace former premier Alison Redford.
Edmonton MLA Thomas Lukaszuk (loo-KAH'-zuhk) is still collecting signatures and has until Friday to do so.
The candidates are to be officially introduced at a party event in Edmonton on June 2.
Party members will vote for the new leader in September.