With an adjustable-rate HECM you can borrow only what you need, when you need it. The part you don’t use grows every month. Here is how that works, with numbers.
A reverse mortgage doesn’t have to be a lump sum. With an adjustable-rate HECM you can take the money as a line of credit: you draw only what you need, when you need it, and you pay no interest on what you haven’t drawn. The unusual part is that the unused part of the line grows every month, at the same rate the loan balance grows. The longer you leave it alone, the more you can borrow later.
The unused line grows at the loan’s interest rate plus the 0.5% annual mortgage insurance rate, compounding monthly. It isn’t interest paid to you, and it isn’t a return on an investment: it is more room to borrow. When you do draw, that money starts adding to the balance like any other loan advance. And because the growth rate follows the loan’s rate, the line grows faster when interest rates rise.
A 65-year-old with a $400,000 paid-off house takes a HECM as a line of credit and draws nothing. HUD’s table gives a principal limit of about $123,200; after about $17,000 of upfront costs (financed into the loan) the line starts at roughly $106,200. In the first 12 months only about $56,900 of it can actually be drawn (the 60% first-year limit, which counts the financed costs); the full line opens after year one.
| Available credit (never drawn) | Loan balance (costs only) | Home value (+3%/yr) | |
|---|---|---|---|
| At closing | $106,200 | $17,000 | $400,000 |
| After 5 years | $152,500 | $24,400 | $463,700 |
| After 10 years | $218,900 | $35,000 | $537,600 |
| After 15 years | $314,200 | $50,300 | $623,200 |
| After 20 years | $451,100 | $72,200 | $722,400 |
Assumptions: principal limit from HUD’s official table at a 7.68% expected rate; balance and unused credit line grow 7.5% a year (7.0% interest + 0.5% annual mortgage insurance); upfront costs = 2% FHA mortgage insurance + the HUD-capped origination fee + about $3,000 of other closing costs. Illustrations, not quotes. Your lender’s rate and a HUD counselor give exact figures.
After 10 untouched years the line is about $218,900, roughly double what it was at closing. The balance in the meantime is only the financed costs plus the interest and insurance on them. That is the whole argument for opening a line early and leaving it alone: it is a growing standby fund you can reach for in a bad market year, for home care, or to cover the years before Social Security.
We go deeper on the HELOC side in HELOCs for seniors and on how rates move each one in our Fed-rates piece.
It fits someone 62 or older who expects to stay in the home for a long time, doesn’t need a large sum today, and wants a reserve that can’t be taken away. It fits poorly if you might move within a few years: you will have paid the upfront costs for a line you never used.
The unused portion grows at the loan’s interest rate plus the 0.5% annual mortgage insurance rate, compounding monthly. At a 7% interest rate, that is about 7.5% a year.
Not the way a HELOC can. The borrower decides when and how much to draw, and the lender can’t freeze or reduce a HECM line because home values fall. Draws stop if the loan becomes due or the borrower defaults, for example by not paying property taxes or homeowners insurance.
No. A fixed-rate HECM pays out as a single lump sum at closing. The line of credit, and its growth, is only available with an adjustable-rate HECM.
No. Interest and mortgage insurance accrue only on money you have drawn (including financed closing costs). The unused line grows but adds nothing to what you owe.
Educational, not individual financial advice. The Equity Ledger doesn’t originate loans. Reverse mortgages are complex and the right answer depends on your specific situation — confirm the details with a HUD-approved counselor before you decide.
Rules and figures are from U.S. government program materials current at publication; HECM limits and rates change — verify with HUD/FHA or a HUD-approved counselor.