Clarification came out on this on July 16 it does apply to HELOC's. Check under Top Stories on the BOL home page July 16, Credit Card Rate Change Notice Interim Rule Issued.
from Section 226.5 General Disclosure Requirements
5(b) Time of Disclosures
As amended by the Credit Card Act, TILA Section 163 generally prohibits a creditor from treating a payment as late or imposing additional finance charges unless the creditor mailed or delivered the periodic statement at least 21 days before the payment due date and the expiration of any period within which any credit extended may be repaid without incurring a finance charge (i.e., a “grace period”). See Credit Card Act § 106(b).
Unlike most of the Credit Card Act’s provisions, the amendments to TILA Section 163 apply to all open-end consumer credit plans rather than just credit card accounts.8 As discussed below, the Board has implemented amended TILA Section 163 by revising
§ 226.5(b)(2)(ii) and the accompanying official staff commentary.
_________________________
A common mistake people make designing something completely foolproof is to underestimate the ingenuity of complete fools.