The 10 day guidance is something that the examiners try to go by, it's not a rule that they could hit you with, but they can make it uncomfortable. That said, what is your risk? Do you do a fair amount of lending in flood zones? If so, you will get more pressure from your regulator. If only a small amount of loans are in, then they probably won't give you much grief over it. What has been the flavor from past exams? Did they comment that you needed to address this or not?
If you do have a good deal of flood zones, then why not get it earlier in the process? If you are doing a home purchase, you generally have a good amount of time to gather the info, we order the flood at the same time that we order the appraisal and legal opinion. At this point, the lender is fairly sure that he is going to make the loan. It takes persistance to change a lender's thinking and get them to see this in a new light--it's a processing doc, not a closing doc.
Lastly, if you have a fair amount of flood zones, isn't it better customer service to let them know early in the process rather than at a time that they are trying to find boxes and figure out what to move and what to throw?
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