Cashier Check at Closing to Buyer

[Glen M.]

I have closing tomorrow to sell my first fix and flip. The question I have is, we negotiated a seller credit for some work they wanted done but I didn't have time to finish before closing. The amount is not on the closing statement and I was told to bring a cashier's check to closing made out to the buyers. I want to make sure if I do this I can claim the amount as a write off. Can anyone answer this?

Thanks!