You need to get a Michigan ID when you are establishing Michigan residency or need a state ID for the first time, and Michigan’s Secretary of State says new residents should apply once they have established residency. For first-time applicants, the state requires an in-person office visit with documents proving identity, legal presence, Social Security number, and Michigan residency.
The “30 days” part usually shows up in a different context: if you are 18 or older and applying for a first-time driver’s license, you must practice driving with a licensed adult for at least 30 days after passing the knowledge exam before you can take the driving skills test. That 30-day rule is about the license process, not about getting a Michigan ID card.
When you need one
A Michigan ID is for people who do not have a driver’s license or who want a state-issued identity card. Michigan says residents must apply in person and bring the required paperwork, and the state also offers a pre-application step online before the office visit.
What you need to bring
For a first-time ID, Michigan requires proof of identity, legal presence, Social Security number or ineligibility for one, and Michigan residency. Accepted residency documents include items such as a utility bill, bank statement, lease, pay stub, or other government document, and the state says two proof-of-residency documents are required.
Practical timing
If you have just moved to Michigan, the safest move is to apply as soon as you have established residency and can gather the required documents. If your question was really about driving, the 30-day rule applies before the road test for adult first-time license applicants, not to the ID card itself.