Cost bucket What it is Where to read deeper
Note rate Contract interest on the unpaid balance Interest calculation
APR Annualized cost including many finance charges Points & fees
PMI / MI Insurance on high-LTV conventional (borrower-paid vs lender-paid paths) PMI removal
Closing & third-party Title, recording, appraisal, prepaid per-diem, escrows Break-even on refi

Updated May 2026. APR is a comparator, not a crystal ball—your hold period and tax situation still determine realized cost.

APR vs note rate (borrower takeaway)

Use APR to sort similar structures on the Loan Estimate. If one offer buys down rate with points, APR rises unless the rate drop offsets within your horizon—model months-to-recover using the break-even framework alongside APR.

PMI as a cost line, not an afterthought

PMI changes front-end housing math until removed. Treat PMI dollars like interest when comparing paydown vs refinance vs equity-based alternatives.

Reference sources