I believe the revised MI Banking Code of 1999 made much of that go away. Different state statutes had varying maximum rates & fees, and now things are a lot cleaner. It's now based on what the bank & consumer agree to in the note, assuming no predatory lending triggers. The most common thing we see is the greater of 5% of the payment or $15.
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Opinions are Bartman's, not those of my employer. "A noble spirit embiggens the smallest man."