Any Michigan Republican is eligible to participate in the primary. A registered voter declares her or his party designation by selecting a Republican ballot at the polls. The voter's choice becomes public information.

Tuesday 10 March 2020: Michigan Primary. Hours reportedly 7:00a-8:00p EDT (1100-0000 UTC) / 7:00a-8:00p CDT (1200-0100 UTC). Relatively small portions of this state are in CT and so the vast majority of the polls are closed by the time indicated ET, when the networks feel they can project. Delegate Binding: Winner-Take-Most Primary. Voter Eligibility: Open Primary.

Primary (preliminary)
Included in Nationwide vote.

All 73 of Michigan's delegates to the Republican National Convention are bound to presidential contenders based on the results of the voting in today's Michigan Presidential Primary.

• If a candidate received 50% or more of the statewide vote that candidate receives all of the state's 73 delegates. Otherwise:
• 73 National Convention Delegates are proportionally allocated to those candidates receiving 20% or more of the statewide vote; if no candidate receives at least 20% of the statewide vote, then the threshold shall be the percentage of the vote cast for the candidate with the most votes (rounded up or down to the nearest 10th of a percent) minus 5% (thus, if the statewide winner receives 14.3% of the vote, the new threshold is 9.3%).
• The total number of votes cast for those candidates (receiving the threshold or more the statewide vote) is the "qualified vote". For each candidate (receiving 20% or more the statewide vote), divide the candidate's vote by the "qualified vote" and multiply by 73 delegates. Round factions to the nearest whole number (below 0.5 are rounded down, 0.5 and above are rounded up). If the end result is less than 73 delegates, allocate the remaining delegates to the candidate receiving the most votes statewide. If the end result is more than 73 delegates, subtract the necessary delegates from the candidate receiving the fewest votes statewide.

Primary (preliminary)

Delegate binding: Delegates are bound to their Presidential preference through the first ballot at the Republican National Convention. Delegates may not amend their Preference unless released from that commitment. Delegates become officially uncommitted if their Presidential candidate withdraws from contention as a Republican candidate for President of the United States, suspends his or her campaign, endorses another candidate for President of the United States, seeks the nomination of a political party other than the Republican Party for any political office.

Thursday 26 March 2020: County Conventions

Precinct delegates elected to the County Conventions elect delegates to the State Convention. This step is not formally related to Presidential Preference.

Friday 24 April - Saturday 25 April 2020: Congressional District Caucuses and State Convention. The primary determines the binding of the Michigan's delegates. The State Convention elects individuals to fill the delegates positions.

National Convention District delegates are elected according to the results of the primary. State Convention delegates meet in Congressional District caucuses at 7p EDT on Friday. Each of the 14 Congressional District caucuses elects 3 National Convention delegates according to the results of the primary. The procedure for distributing Congressional District delegates in each CD is as follows:

• A list is made of all the candidates who reached the 'Threshold Vote' (this means those candidates who have reached the statewide threshold) along with the number of votes each such candidate received within a given CD;
• the percentage of the vote received by each qualifying candidate (based on the total vote for all qualifying candidates- again, only those who had reached the 'Threshold Vote') in a given CD is then calculated;
• the first Congressional District delegate pledged shall go to the qualifying candidate who has gotten the highest percentage of the vote in that CD; only after this delegate is so assigned, the percentage of the vote received by said candidate is then reduced by 33 1/3%;
• the second Congressional District delegate pledged shall go to the qualifying candidate who has received the highest remaining percentage of the vote in that CD (including the leading candidate in the CD's percentage minus 33 1/3%) after which the percentage of the vote received by the candidate to whom the second CD delegate has been pledged is then also reduced by 33 1/3%;
• Finally, the third Congressional District pledged shall go to the qualifying candidate who has received the highest remaining percentage of the vote in that CD (including any and all percentages as already reduced by 33 1/3% per the rules above).

The State Convention delegates vote on a slate of 28 at-large delegates as proposed by the Credentials Committee. Note: The Presidential preferences or binding of the (CD plus at-large) delegates must add up to the statewide Presidential preferences or binding as determined by the 8 March primary.

In addition, the State Convention elects the National Committeeman and the National Committeewoman. These individuals, along with the chairman of the Michigan's Republican Party, will attend the convention as bound delegates by virtue of their position.