STATE LAW – MICHIGAN LIBRARY – GUIDE 06
Michigan Stacking & Multiple Insurance Policies
The word ‘stacking’ can obscure several different Michigan insurance questions. PIP priority, multiple vehicle policies, and optional UM/UIM aggregation must be analyzed separately under the No-Fault Act and the actual policy.
Multiple Policies
First decide what benefit is being combined
Michigan’s PIP system is governed by statutory priority and coverage-election rules. Optional UM/UIM aggregation is governed primarily by the policy contract. They should not be treated as the same stacking doctrine.
PIP is a priority question, not ordinary stacking
MCL 500.3114 identifies the PIP insurer or priority route for many injured persons and special situations. Michigan’s PIP medical election statutes govern the selected medical coverage level. The existence of multiple household or vehicle policies does not automatically mean benefits can be added together; the first task is to determine the proper source of benefits under the statutory scheme.
UM/UIM stacking depends on contract language
Because Michigan generally does not mandate UM/UIM coverage, policy provisions controlling limits, other insurance, anti-stacking, occupancy, and covered persons can be decisive. Rory and Wilkie reinforce the importance of clear policy wording. A multiple-policy investigation should collect every declarations page and endorsement before deciding whether one limit, multiple limits, or no additional UM/UIM applies.
Common multi-policy traps
- Assuming every household policy protects every household member.
- Adding limits without reading anti-stacking or other-insurance clauses.
- Confusing PIP priority with UM/UIM aggregation.
- Ignoring employer, commercial, rental, or TNC policies.
- Settling the liability claim before satisfying contractual UM/UIM notice or consent requirements.
Authorities
Primary Michigan authority for this topic
Use the current statute, controlling decisions, and the operative policy before legal reliance.