Great question and, fortunately, you aren't really behind at this point - it's a long explanation, but in short, Reg B gives you a transition period to switch from being a HMDA reporter to collecting data under Regulation B.
As far as your question, I want to address two separate things. You asked about using the "old GMI form", but I think it is also important to point out that eventually, you will (most likely) want to transition to the collection requirements under Reg B, which means you will need to change the types of loans you actually collect GMI for, or you will be violating Reg B.
Starting with your question about using the old GMI form, I assume you are asking whether it is okay to no longer collect the "subcategory" information for ethnicity and race - for example, the "Hispanic or Latino" category has four subcategories: Mexican; Puerto Rican; Cuban; and Other Hispanic or Latino. As you are no longer a HMDA reporter subject to Regulation C requirements, you can transition to being a Reg B data collector. Specifically, 1002.13(a)(i) of Reg B says that you must collect ethnicity and race using either A) the aggregate categories, or B) the categories and subcategories required under HMDA rules. In simple terms, You have the choice to continue collecting the subcategory information OR, you can go back to the "old GMI form" if you want. The bottom line is that Reg B gives you the choice.
Now for my second point. As a newly exempt HMDA reporter, you essentially have three options 1) to voluntarily report HMDA going forward, 2) keep collecting DI under HMDA temporarily, or 3) transition to GMI collection under Reg B. For the first two options (and option 2 is a max of five years), you can continue to collect DI for the types of loans covered under Reg C. The trick here is that Reg B has different rules on which loans must collect GMI, meaning that some loans you collected DI for under HMDA would be considered a violation if you collected GMI for them under Reg B. For example, Reg B only requires GMI to be collected only if an application relates to a dwelling that is or will be occupied by the applicant as the principal residence. As you know, HMDA requires the reporting of second homes and (some) investment properties. Under Reg B, you don't collect GMI unless it is to be occupied as a primary residence - and if you do collect the information, it is a violation of Reg B and could be a fair lending issue. So, my point here is that, unless you plan to again be subject to HMDA rules (within 5 years) or plan to voluntarily report (under option 1 above), you will need to transition to Reg B rules which are actually quite different than HMDA rules.
So the bottom line is this: You need to decide if and when you are going to transition to Reg B data collection and then, you can decide if you want to just use the old GMI form (and just collect the categories of information) or if you want to continue using the new DI form (and collect both the categories and subcategories of information).
I hope that answers your question(s) as I know this is a very complex topic (as I spent over an hour in my training video explaining everything related to transitioning from HMDA to Reg B).
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Adam Witmer, CRCM
All statements are my opinion, not those of my employer, and should not be taken as legal advice.
www.compliancecohort.com