The borrower is going to pay that $4,000 as part of the closing. Because you have a tolerance violation, you will pay the borrower in the closing $1,500. It's not a case of the bank paying part of the broker's fee. It's a case of paying a penalty for underestimating the closing costs.
What you definitely do NOT want to do is list the broker's fee as $2,500 from the borrower and $1,500 paid by others (lender) to avoid the tolerance violation. The net cash to/from the borrower would be the same, but you'd both be paying the broker, and that's verboten.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8