Tests the HPML higher-priced mortgage loan definition per Reg Z §1026.35(a) and the resulting escrow obligation per §1026.35(b). A loan is HPML if its APR exceeds the APOR by 1.5 percentage points (first-lien standard), 2.5pp (first-lien jumbo above the FHFA conforming limit), or 3.5pp (subordinate lien). These Dodd-Frank structural thresholds have been unchanged since 2014. A first-lien HPML must carry a property-tax-and-insurance escrow for at least 5 years unless an exemption in §1026.35(b)(2) reaches it. Every one of those exemptions is modelled here, including the fourth condition of the small-creditor test that a creditor maintaining other escrow accounts fails. Separate from HOEPA high-cost triggers (art-234).