Rebate form would not matter - if the premium is considered collected before or at closing it is included in the points and fees trigger test. Using the rule of 78's, I think the entire premium would be considered collected at closing.
As a side note, remember that if the premiums are collected monthly, you would still include the amount of any premium collected before or at closing in your calculation. Mostly, that will be just one month's premium.
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The opinions expressed here are personal and do not represent opinions of my employer.