Most retirees are taught a simple rule: keep a cash bucket for emergencies and spend from investments for everything else. The problem is that retirement doesn’t cooperate with tidy rules—markets drop, roofs leak, health events happen, and long-term care expenses don’t show up politely.

One of the most underused planning tools for managing those “life happens” moments is a HECM reverse mortgage set up as a line of credit—then left mostly unused.

That’s what people mean by a standby line of credit.

What is a “standby line of credit” (in plain English)?

A standby line of credit is a pre-approved pool of money you set up before you desperately need it.

With a HECM line of credit, you’re establishing access to a portion of your home equity through FHA/HUD’s reverse mortgage program. You can leave the line untouched and use it later for:

• A market downturn (so you don’t sell investments at a loss)
• A big medical bill or caregiving expense
• Home repairs (roof, foundation, accessibility upgrades)
• Income gaps (unexpected taxes, insurance jumps, inflation pressure)
• Any other financial emergency

Importantly, interest only accrues on what you actually borrow, not on the unused portion of the line. 

The real retirement problem this solves: sequence-of-returns risk

“Sequence risk” is a fancy phrase for a very human problem:

If you’re withdrawing from your portfolio and you get bad returns early, you may never recover—even if long-term averages look fine.

Sacks & Sacks’ paper specifically describes a coordinated strategy that draws retirement income from the portfolio in up years, and draws from the reverse mortgage line of credit following down years—so you’re not selling into weakness. 

This isn’t theory for theory’s sake. It’s risk management.

Why a HECM line of credit is different from a HELOC

People naturally compare this to a HELOC. But they behave very differently, especially when you’re older and markets or property values are volatile.

A traditional HELOC:

• Usually has a limited draw period (often 5–10 years)
• Can be reduced, frozen, or closed by the lender under certain conditions
• Typically requires income/credit underwriting and may be harder to qualify for later in retirement

A HECM line of credit:

• Is part of an FHA/HUD-insured reverse mortgage structure 
• Cannot be frozen just because home values decline (a key difference many retirees and advisors care about) 
• Lets you keep funds “in reserve” and draw only if/when needed 

In other words: a HELOC is often a “working years” product. A HECM LOC can be a “retirement years” liquidity backstop.

The feature most people don’t understand: the unused line can grow

A unique feature of the HECM line of credit is that the available credit can increase over time.

Mechanically, the reverse mortgage has a “principal limit” framework, and the available line of credit is tied to that structure. Research and industry education pieces explain that the components grow at the same “effective rate,” which historically has been described as the note rate plus mortgage insurance premium (MIP) and lender margin in the contract structure. 

What you should take away as a homeowner (or advisor):

• You’re not locking in a static credit line forever.
• If you establish it early and leave it mostly untouched, the “standby” resource may become larger later—when you’re older and more likely to need it. 

Important note on MIP (so we’re accurate): older technical explainers often reference a higher annual MIP (for example, 1.25% in prior eras). 
More current lender education materials commonly describe the annual MIP as 0.50% today. 
(As always, the exact growth math depends on the specific loan terms and current program rules.)

“Standby” doesn’t mean “never use it” — it means “use it strategically”

A standby HECM line of credit is not just an emergency fund. It can be used intentionally:

1) Cover spending in down markets (avoid selling stocks at a loss)

This is the classic coordinated approach described in the Sacks & Sacks framework: when the portfolio has a down year, use the credit line for next year’s withdrawals so the portfolio can potentially recover. 

2) Handle healthcare shocks and long-term care expenses

Retirement planning often breaks down around health costs. A standby line can be a liquidity tool—especially for:

• In-home care
• Home modifications (ramps, walk-in showers, stair lifts)
• Bridging time while evaluating other options (insurance, annuities, family support)

3) Pay it back when it’s convenient

A HECM allows voluntary repayment. When you repay borrowed amounts, you can restore available credit (and then it can continue growing based on the loan’s mechanics). 

That flexibility matters: you can borrow, repay, re-borrow—based on what your retirement plan actually does in real life.

Why “setting it up early” can be the whole point

One of the more counterintuitive conclusions that comes through in the financial planning research is the potential advantage of opening the reverse mortgage line early—even if you won’t use it for years. 

That doesn’t mean it’s right for everyone. It means: if you decide a standby line is part of your plan, delaying it until after a crisis (health event, credit tightening, market drawdown) can defeat the purpose.

Who tends to be a good fit for a standby HECM LOC strategy?

This is most commonly discussed for homeowners who:

• Are 62+ and plan to age in place
• Have meaningful home equity and want more liquidity
• Have investment assets and want a tool to reduce sequence risk
• Want a backup plan that doesn’t require selling investments in a down market
• Prefer an option that can be used for any purpose (emergencies, healthcare, repairs, etc.)

And it’s usually not a fit for homeowners who:

• Plan to move soon
• Struggle to keep up with property charges (taxes/insurance/maintenance)
• Don’t want closing costs in the equation unless there’s a clear planning benefit

(That last point matters—reverse mortgages have real costs. The question is whether the risk-management value justifies them for the household plan. The research itself even notes the need to weigh the costs against the strategy benefits. )

Common questions and misconceptions

“Do I lose my house?”
No—HECM borrowers retain title, but they must meet ongoing obligations like property taxes, insurance, and occupying the home as a primary residence (as with the HUD program basics). 

“If I open the line, am I paying interest immediately?”
Interest accrues on funds you borrow; unused credit isn’t accruing interest as a balance. 

“Can the bank freeze it like a HELOC?”
A key distinction often highlighted is that—because HECMs are HUD-guaranteed—lenders cannot freeze the line just because the home drops in value. 

“Is this only for people who are broke?”
Not at all. Much of the discussion around Sacks’ work is about coordinated strategies for households with portfolios—using home equity as a non-correlated buffer to help the plan survive market stress. 

A simple example (conceptual)

Imagine a retiree with:

• A portfolio they draw from each year
• A HECM line of credit they opened but rarely touched

If the market drops 20–30% in a given year, they can:

• Use the standby line to cover the next year’s spending
• Give the portfolio a chance to rebound
• Potentially repay the line later (or not), depending on the plan

This is essentially the “coordinated strategy” idea described in the Journal of Financial Planning research: spend from the portfolio after positive years; spend from the credit line after negative years. 

Bottom line

A HECM standby line of credit is best understood as:

• A retirement liquidity plan
• A buffer against market downturns
• A flexible emergency resource
• A tool that may be more reliable in retirement than a traditional HELOC
• And, for the right household, a strategy supported by published financial planning research (including work associated with Dr. Barry Sacks) that focuses on improving retirement sustainability by managing sequence risk. 

If you’re a homeowner (or advisor) evaluating whether this fits, the right next step is to model it alongside the broader retirement plan—income sources, tax picture, investment strategy, longevity expectations, and legacy goals.