99.9% of the time in our area the seller pays for the OTI.
What we do is:
Disclose the OTI in H as an optional charge but we do not include it in our Lender Credit unless we have the Purchase Agreement prior to issuing the initial LE and it is one of those .01% times the buyer agreed to pay the OTI. In that case we include the charge in the Lender Credit.
If we receive the Purchase Agreement after issuing the initial LE and it calls for the buyer to pay the OTI we do not issue a revised LE but we include the charge on CD and increase our lender credit to cover the additional charge.
Just a side note. This is something we just recently started doing. Prior to that we weren't disclosing any costs the bank was paying on the LE for a no cost loan but due to a recent thread we changed our procedures.
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The opinions expressed are mine and they are not to be taken as legal advice.