How to Calculate Reverse Mortgage Proceeds and Real Costs

What a Reverse Mortgage Actually Pays You

A Home Equity Conversion Mortgage (HECM) does not pay you a percentage of your home's value. It pays you a percentage of the lesser of three figures: the appraised value, the purchase price, or the FHA lending limit. In 2025, that FHA limit sits at $1,209,750.

The actual payout starts with the principal limit factor (PLF). The FHA publishes PLF tables keyed to two variables: the age of the youngest borrower and the expected interest rate (EIR). The EIR is the 10-year LIBOR swap rate plus the lender's margin, rounded to the nearest 0.125%.

Older borrowers receive higher PLFs. Lower expected rates produce higher PLFs. A 62-year-old borrower at a 7.0% EIR receives a PLF of roughly 0.347. A 78-year-old borrower at a 5.5% EIR receives a PLF closer to 0.528.

Gross principal limit = Maximum Claim Amount x PLF

That number is not your payout. It is the ceiling before deductions.

The Fee Structure Most Borrowers Undercount

Four categories of costs reduce your gross principal limit before you receive a dollar.

Origination fee. Lenders charge the greater of $2,500 or 2% of the first $200,000 of the home's value, plus 1% of the remaining value above $200,000. The total origination fee is capped at $6,000.

Upfront mortgage insurance premium (MIP). FHA charges 2% of the maximum claim amount at closing, regardless of how much equity you draw.

Third-party closing costs. Appraisal, title insurance, settlement fees, and recording charges typically total $3,000 to $6,000 depending on state and property.

Existing mortgage payoff. If you carry a remaining balance, HECM proceeds must retire it first. This is the single largest surprise cost for most borrowers.

Annual MIP runs at 0.5% of the outstanding loan balance. It accrues monthly and compounds alongside the loan's interest rate. Over a 15-year loan horizon, this compounding effect is significant.

Worked Example 1: The Clean Scenario

A 74-year-old borrower owns a home appraised at $550,000 with no existing mortgage. The current expected interest rate is 6.25%.

The PLF for age 74 at a 6.25% EIR is approximately 0.442.

Gross principal limit: $550,000 x 0.442 = $243,100

Origination fee: 2% of $200,000 = $4,000, plus 1% of $350,000 = $3,500. Total: $7,500. Capped at $6,000.

Upfront MIP: 2% of $550,000 = $11,000

Third-party closing costs: $4,200 (estimated)

Total upfront deductions: $6,000 + $11,000 + $4,200 = $21,200

Net available proceeds: $243,100 - $21,200 = $221,900

The borrower receives $221,900, not $243,100. The gap is $21,200, or 8.7% of the gross figure. Distributed as a lump sum, this is the actual check.

If the borrower instead selects the tenure payment option, the lender converts net proceeds to a monthly payment using actuarial tables and the note rate. At a 7.125% note rate on a net principal limit of $221,900, the monthly tenure payment for this borrower would approximate $1,180.

Worked Example 2: The Scenario With an Existing Mortgage

A 69-year-old borrower owns a home appraised at $720,000. The existing mortgage carries a $148,000 balance. The expected interest rate is 6.75%.

The PLF for age 69 at a 6.75% EIR is approximately 0.391.

Gross principal limit: $720,000 x 0.391 = $281,520

Origination fee: 2% of $200,000 = $4,000, plus 1% of $520,000 = $5,200. Total: $9,200. Capped at $6,000.

Upfront MIP: 2% of $720,000 = $14,400

Third-party closing costs: $5,100

Existing mortgage payoff: $148,000

Total deductions: $6,000 + $14,400 + $5,100 + $148,000 = $173,500

Net available proceeds: $281,520 - $173,500 = $108,020

The borrower walks away with $108,020 in accessible equity on a $720,000 home. That is 15% of the home's appraised value. The borrower who calculated "I have $720,000 in my home and I'll get nearly half of it" was off by $132,980.

This is the scenario where the existing mortgage payoff turns a comfortable outcome into a tight one. The math must be run before the counseling session, not after.

How Compounding Interest Erodes the Estate

Reverse mortgage interest is not paid monthly. It accrues and capitalizes. The loan balance grows every month at the note rate plus the 0.5% annual MIP, divided by 12.

On a $221,900 principal balance at a 7.125% note rate plus 0.5% MIP, the combined rate is 7.625%. Monthly accrual: $221,900 x (0.07625 / 12) = $1,409.

After one year with no additional draws, the balance reaches approximately $238,808. After five years: approximately $322,400. After ten years: approximately $470,600. After fifteen years: approximately $686,500.

On a $550,000 home appreciating at 3.5% annually, the home is worth approximately $919,000 at the fifteen-year mark. Remaining equity: approximately $232,500. On a $550,000 home appreciating at 2.0% annually, the home is worth approximately $741,000. Remaining equity: approximately $54,500.

Growth rate assumptions are not academic. A 1.5 percentage point difference in home appreciation changes the estate value at year fifteen by roughly $178,000 in this scenario.

Disbursement Options and Their Implications

The HECM program offers four disbursement structures. Each carries different financial implications.

Lump sum. Available only with fixed-rate HECMs. Delivers the full net principal limit at closing. The entire amount begins accruing interest immediately.

Line of credit. Available with adjustable-rate HECMs. Unused credit grows at the same rate as the loan's interest plus MIP. A $100,000 unused line of credit at a 7.625% combined rate grows to approximately $144,200 after five years. This growth feature is the most financially powerful aspect of the HECM program and the least understood.

Tenure payments. Fixed monthly payments for as long as the borrower lives in the home. The lender assumes longevity risk. Payments continue even if the loan balance exceeds the home's value, provided the borrower remains current on taxes, insurance, and maintenance.

Term payments. Fixed monthly payments for a specified period. Less actuarial risk for the lender, which means lower payments than the tenure option for the same principal limit.

Most borrowers default to the lump sum because it looks largest. The line of credit combined with delayed draws often produces superior long-term outcomes, particularly for borrowers who do not need immediate liquidity.

The Non-Recourse Ceiling

HECM loans are non-recourse. The borrower or estate never owes more than the home's value at sale. FHA insurance covers the difference if the loan balance exceeds proceeds.

This does not make the loan cost-free. MIP premiums fund that insurance. The 2% upfront plus 0.5% annual rate is the borrower's direct cost for the non-recourse protection.

For a borrower in a declining real estate market, non-recourse protection has material value. For a borrower in an appreciating market, it is largely an insurance premium that generates no direct return.

What the Calculator Needs to Produce Accurate Numbers

To model your specific scenario accurately, you need six inputs: home appraised value, age of the youngest borrower, current expected interest rate (available from your lender), existing mortgage balance, anticipated disbursement method, and your estimated home appreciation rate.

With those six figures, the CalcMoney mortgage calculator produces your gross principal limit, itemized fee deductions, net proceeds, monthly tenure payment equivalent, projected loan balance at five-year intervals, and remaining equity under two appreciation scenarios.

The difference between a back-of-envelope estimate and a precise projection is typically $40,000 to $80,000 on a mid-value property. That gap is a financial decision, not a rounding error.

Run your numbers with the CalcMoney mortgage calculator before your required HECM counseling session. Walk into that session knowing your figures, not learning them for the first time.

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CalcMoney provides financial calculations for informational purposes. HECM terms vary by lender and are subject to FHA guideline changes. Consult a HUD-approved counselor before proceeding with any reverse mortgage application.