From 1026.35:
(a) Definitions. For purposes of this section:
(1) "Higher-priced mortgage loan" means a closed-end consumer credit transaction secured by the consumer's principal dwelling
Second or vacation homes would not be subject to 1026.35.
From 1026.43
(a) Scope. This section applies to any consumer credit transaction that is secured by a dwelling, as defined in § 1026.2(a)(19), including any real property attached to a dwelling, other than:
(1) A home equity line of credit subject to § 1026.40;
(2) A mortgage transaction secured by a consumer's interest in a timeshare plan, as defined in 11 U.S.C. 101(53(D)); or
b) Definitions. For purposes of this section:
(1) Covered transaction means a consumer credit transaction that is secured by a dwelling, as defined in § 1026.2(a)(19), including any real property attached to a dwelling, other than a transaction exempt from coverage under paragraph (a) of this section.
Any consumer purpose loan secured by a dwelling is subject to 1026.43 unless it meets one of the specified exemptions.
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The opinions expressed are mine and they are not to be taken as legal advice.