How it works
Why the HECM LOC Grows — and What That Means for You
The HECM line of credit grows because HUD's formula adds the current interest rate plus the 0.50% annual FHA MIP to the unused balance each month. This isn't interest you earn — it's increasing borrowing capacity. You can draw more later than you could draw today.
The practical effect is powerful for retirement planning. A borrower who opens a $120,000 HECM LOC at 65 and never touches it could have over $230,000 available at 75 — at a 6.75% growth rate. Someone who waited until 75 to open the line would start at whatever their principal limit is at that point, likely lower than if they'd established it earlier.
The compounding rule: Growth applies only to the unused portion. When you draw from the line, that drawn amount stops growing. The remaining balance keeps compounding. This is why drawing strategically — taking only what you need — maximizes what's available for home care, medical expenses, or market downturns later.
The Feature a HELOC Can't Match
A HELOC credit limit is set at origination and doesn't grow. Worse, lenders can freeze or reduce a HELOC at any time — and historically do so during recessions, when borrowers need it most. During 2008–2009, millions of HELOC borrowers had their lines frozen with no notice.
A federally insured HECM line of credit cannot be frozen, reduced, or cancelled as long as you live in the home and pay property taxes and insurance. That guarantee, combined with the growth feature, is why many CFPs now use the HECM LOC as a core buffer asset in retirement income plans.
Use the calculator above to enter your expected LOC amount (use the
reverse mortgage calculator to estimate yours), set your expected rate, and model different draw scenarios. The chart shows navy as your starting balance and gold as the growth on top.
Common questions
LOC Growth: Frequently Asked
How does the HECM line of credit grow?
The unused portion grows monthly at your loan's current interest rate plus 0.50% FHA MIP, applied to the unused balance. At 6.25% expected rate: growth = (6.25% + 0.50%) ÷ 12 = 0.5625% per month, compounded. After 12 months on a $120,000 LOC, that's approximately $128,385 available — without drawing anything.
Can a lender reduce or freeze my HECM line of credit?
No. Unlike a HELOC, a federally insured HECM line of credit cannot be frozen, reduced, or cancelled by the lender as long as you meet the basic loan terms: living in the home as your primary residence and keeping up property taxes, homeowner's insurance, and basic maintenance.
Does the LOC keep growing if I make draws?
Yes — on the remaining unused balance. When you draw, that portion stops growing. The unused balance continues compounding. The calculator's "Annual draws" slider models this: enter your expected annual draw to see how it affects the projection.
What rate should I enter in the calculator?
Use the expected interest rate shown on your HECM loan disclosure, or the current expected rate your originator quotes you. If you don't have a loan yet, 6.25% is a reasonable placeholder for 2026. The total growth rate shown in the gold box (e.g., 6.75%) is what actually drives the projection.
This calculator is for educational purposes only. LOC growth projections assume a constant interest rate — actual HECM ARM rates adjust annually. Growth represents increased borrowing capacity, not earned interest or investment returns. Results do not constitute a loan commitment or offer. Renee Konstantine, CRMP, NMLS #1360025, C2 Financial Corporation, licensed in California and Washington State.