Supplement I, 226.5b: Requirements for Home Equity Plans (01/01/02)
1. Coverage. This section applies to all open-end credit plans secured by the consumer's dwelling , as defined in §226.2(a)(19), and is not limited to plans secured by the consumer's principal dwelling . (See the commentary to §226.3(a), which discusses whether transactions are consumer or business-purpose credit, for guidance on whether a home equity plan is subject to Regulation Z.)
If the business line of credit is secured by equity in the dwelling then IMO it's a home equity line of credit. It's a line of credit secured by equity in a home/dwelling.
As long as the LOC is an open-end LOC, I stand firmly by my belief that they are optional for reporting purposes.
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The opinions expressed are mine and they are not to be taken as legal advice.