As long as the owner of the homestead receives a final itemized disclosure of the actual fees, points, interest, costs, and charges that will be charged at closing at least one business day prior to closing, Texas law does not specify the format. For HELOCS, a “lender may satisfy this requirement by delivering properly completed account-opening disclosures under Regulation Z, 12 C.F.R. §1026.6(a)." Disclosure in this manner isn’t required, but I think it is what most lenders use.
This method is mentioned in the rules as one convenient method of disclosure a lender might use. See Rule 153.13(3)(B):
https://texreg.sos.state.tx.us/public/readtac$ext.TacPage?sl=R&app=9&p_dir=&p_rloc=&p_tloc=&p_ploc=&pg=1&p_tac=&ti=7&pt=8&ch=153&rl=13
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