Every reverse mortgage starts with one number
Before rates, before payout options, before anything else, one figure decides what a reverse mortgage can do for you: the principal limit. It is the gross pool the loan draws from, before any payoffs or costs come out. Get this number right and the rest of the conversation is easy. Get it wrong and nothing else lines up.
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On this page
- Every reverse mortgage starts with one…
- What it looks like with real numbers
- Principal limit and LTV
- How age raises your reverse mortgage…
- How interest rates change your reverse…
- How your home value fits in
- Who should pay closest attention to the principal limit
- Reverse mortgage calculator
- Frequently asked questions
- Authoritative sources
- Related guides
- Explore all guides
- Areas I serve
First, the math, because it is simpler than most people expect. Your lender takes a percentage, called the principal limit factor, or PLF, and multiplies it by your home value, capped at the FHA limit. If your PLF is 48 percent and your home is worth $500,000, your principal limit is about $240,000. First the percentage, then the value, then subtract what has to be paid off.
What it looks like with real numbers
The same $600,000 home at three different ages
Age is the biggest lever, so hold the home value and rate steady and just move the age. These are illustrative figures to show the shape of it, not a quote.
| Youngest borrower | Approx. PLF | Principal limit on a $600,000 home |
|---|---|---|
| Age 62 | about 41% | about $246,000 |
| Age 72 | about 48% | about $288,000 |
| Age 78 | about 54% | about $324,000 |
Same house, same rate, and the number moves by nearly $80,000 across those ages. That is why the youngest borrower’s age matters so much, and why waiting even a few years can change the math.
Principal limit and LTV: the reverse-mortgage version of loan-to-value
On a regular forward mortgage, loan-to-value is the loan divided by the home value, and you pick how much you want up to the lender’s limit. A reverse mortgage flips that. The PLF is essentially your starting loan-to-value, but HUD sets it for you based on your age and the expected rate. You do not get to dial it up.
Here is the honest part. That percentage is lower than the 80 or 90 percent LTV you might see on a forward loan. Most borrowers land somewhere between 30 and 60 percent of their home value. Because you are not making monthly payments, the loan adds interest to the balance every month, and the program leaves room for that balance to grow while still staying inside the home’s value. Lower LTV up front is the trade for no required monthly payment. For how that balance and a credit line behave over time, see the line of credit growth guide.
Reverse Mortgage Calculator
Let’s put your age and home value to real numbers.
A reverse mortgage is a loan. The balance grows over time and is repaid when the last borrower leaves the home. You keep the title, and you remain responsible for property taxes, homeowners insurance, and upkeep.
How age raises your reverse mortgage principal limit
Next, age. The older the youngest borrower on the loan, the higher the PLF, and the more you can borrow against the same house, because HUD assumes an older borrower will hold the loan for fewer years. As a result, waiting even a few years, or putting the older spouse’s age on the file, can meaningfully change the number. The youngest borrower’s age is what counts, so this matters most for couples with an age gap.
How interest rates change your reverse mortgage principal limit
The rate that drives your principal limit is the expected rate, not the note rate you will actually pay this month. The expected rate is a longer-term rate, an index plus the lender’s margin, that HUD uses to estimate how fast the balance could grow. The relationship is inverse. When the expected rate goes up, the PLF goes down and you can borrow less. When it falls, the same borrower qualifies for more. In short, if you were quoted a lower amount during a high-rate stretch, it is worth pulling fresh numbers.
How your home value fits in, and the FHA cap
The PLF applies to the lesser of your appraised value or the FHA lending limit, which is $1,249,125 in 2026. Below that cap, more value means a bigger principal limit dollar for dollar. Above it, a standard HECM stops counting the extra value, and a proprietary or jumbo reverse mortgage that lends against the full value takes over. The types of reverse mortgages guide breaks down HECM versus proprietary, and the costs guide covers what comes out of the principal limit at closing.
Who should pay closest attention to this
If you are close to 62, the principal limit is the single number worth watching, because it is quietly climbing with your age. If you carry an existing mortgage, it decides whether the reverse mortgage can pay it off and still leave you cash. And if your home is near or above the FHA limit, the principal limit is where the decision between a standard HECM and a proprietary loan gets made. In every one of those cases, it is worth a conversation before you assume the answer.
Frequently asked questions
What is a reverse mortgage principal limit?
The principal limit is the maximum amount a reverse mortgage will lend against your home. It is calculated from three inputs: the age of the youngest borrower, the expected interest rate, and your home value up to the FHA limit of $1,249,125 in 2026. It is the reverse-mortgage version of a loan-to-value ceiling.
How is the principal limit calculated?
Your lender multiplies a principal limit factor (PLF) from a HUD table by the lesser of your appraised value or the FHA lending limit. The PLF is a percentage that goes up with the borrower’s age and down as the expected interest rate rises.
What is a principal limit factor (PLF)?
The PLF is the percentage of your home value the program will lend. If your PLF is 48 percent and your home is worth $500,000, your principal limit is about $240,000 before payoffs and closing costs.
How does age affect the principal limit?
The older the youngest borrower, the higher the PLF and the larger the principal limit. HUD assumes a shorter borrowing horizon for older borrowers, so it lends a bigger share of the home value. Every year you wait, the limit generally ticks up.
Why did rising interest rates lower my principal limit?
The PLF is set from the expected interest rate, not the note rate. When the expected rate rises, HUD assumes the balance will grow faster over time, so it lowers the PLF and the amount you can borrow. When rates fall, the same borrower qualifies for more.
Does a higher home value always mean a higher principal limit?
Only up to the FHA limit. In 2026 the HECM caps home value at $1,249,125, so value above that does not raise a standard HECM principal limit. Higher-value homes can use a proprietary or jumbo reverse mortgage that lends against the full value.
Is the principal limit the same as the cash I receive?
No. The principal limit is the gross amount available. From it you subtract any existing mortgage payoff, closing costs, and any required set-asides. What is left is what you can actually use as a lump sum, line of credit, or monthly payments.
Authoritative sources
For the official rules and consumer guidance behind the principal limit: HUD HECM program, Consumer Financial Protection Bureau, and the National Reverse Mortgage Lenders Association. For a deeper broker-side walkthrough, see my post on the reverse mortgage principal limit for HECM and proprietary loans.
Related guides
Keep going: how a reverse mortgage works, requirements, costs, types, line of credit growth, and is it right for me.
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About Christopher Gibson
Christopher Gibson (NMLS #1910430) is an independent mortgage and reverse mortgage broker with C2 Financial Corporation (NMLS #135622), serving homeowners across the states he is licensed in. Mailing address: 9030 35th Ave SW, Seattle, WA 98126. Call or text 720-449-6622. More about Christopher.