Reverse Mortgage Purchase Calculator
A reverse mortgage purchase calculator helps you see what happens after closing on a Home Equity Conversion Mortgage for Purchase (HECM for Purchase, or H4P) — a distinct FHA-insured loan that lets a buyer 62 or older purchase a new primary residence with reverse mortgage proceeds, instead of converting equity in a home they already own. You bring a larger cash down payment to closing than a conventional buyer would, the reverse mortgage covers the remainder of the purchase price, and from that point forward the loan behaves exactly like any other HECM: no required monthly principal-and-interest payments, and a balance that grows over time as interest, ongoing mortgage insurance, and any servicing fee compound against it.
Buyers choose H4P for a specific reason: they want to move — downsizing, relocating near family, or upgrading to a home that better fits retirement — without either draining most of their liquid savings into an all-cash purchase or taking on a monthly mortgage payment they'd rather avoid on a fixed income. It's a one-step alternative to buying with cash or a conventional mortgage and refinancing into a reverse mortgage years later: H4P combines the purchase and the reverse mortgage into a single closing.
It's most often used by retirees and their financial advisors, real estate agents who specialize in senior relocations, and adult children helping a parent compare an H4P purchase against paying cash, financing with a conventional mortgage, or staying put and using our standard reverse mortgage calculator to tap equity in the home they already have instead. The calculator below models the part every one of those scenarios shares once the reverse mortgage is in place: how the financed balance grows the longer you stay.
↓ Open the CalculatorTry the Reverse Mortgage Purchase Calculator
Reverse mortgages don't amortize like a forward loan — there's no required monthly payment, so interest, mortgage insurance, and any servicing fee compound against the balance every month instead of being paid down. The balance only grows.
Balance After 20 Years
$548,467
Interest & Fees Accrued
$398,467
Estimated Remaining Equity
$0
At this rate, the balance is projected to reach your home's current value around year 16 — HECM reverse mortgages are non-recourse, so you or your heirs would never owe more than the home is worth at that time.
| Year | Balance | Interest & Fees Accrued |
|---|---|---|
| 1 | $160,046 | $10,046 |
| 5 | $207,423 | $57,423 |
| 10 | $286,828 | $136,828 |
| 15 | $396,630 | $246,630 |
| 20 | $548,467 | $398,467 |
For H4P, enter your new home's purchase price as "Current Home Value" and the amount you're financing through the reverse mortgage (purchase price minus your down payment and any costs you're not rolling in) as "Initial Balance Drawn." The growth math afterward is identical to any HECM — it doesn't matter whether the starting balance came from converting equity or from a purchase.
How Much Down Payment H4P Actually Requires
There's no flat percentage written into the H4P rules. Instead, HUD calculates the maximum amount you can finance — the "principal limit" — from a formula (the Principal Limit Factor, or PLF) built on three inputs: the age of the youngest borrower on the loan, the expected interest rate at closing, and the lesser of the purchase price or the FHA HECM lending limit. Your required down payment is simply the difference between the purchase price plus closing costs and that principal limit. The older the youngest borrower and the lower the rate, the higher the principal limit and the smaller the down payment needed — because HUD is effectively projecting a shorter or slower balance-growth period before the loan is expected to come due.
Across current HECM for Purchase transactions, that math tends to land down payments somewhere between roughly 45% and 65% of the purchase price, depending heavily on age and the rate environment at the time. That's a wide range on purpose — it moves with rates and shifts meaningfully between a 63-year-old buyer and a 90-year-old buyer. Treat any percentage you see quoted, including the ranges on this page, as a starting point for a conversation with an FHA-approved lender, not a number to budget against.
Worked Example: Buying at Different Ages
To make the range concrete, here's how the required down payment typically shifts by age for the same $400,000 home purchase, holding today's rate environment roughly constant. These figures are illustrative — built from typical current principal limit factor patterns, not a quote for any specific loan:
| Youngest Borrower's Age | Approx. Down Payment % | Down Payment on $400,000 Home | Reverse Mortgage Finances |
|---|---|---|---|
| 62 | ~65% | $260,000 | $140,000 |
| 70 | ~59% | $236,000 | $164,000 |
| 80 | ~52% | $208,000 | $192,000 |
| 90 | ~40% | $160,000 | $240,000 |
Take the 70-year-old row: a buyer that age purchasing a $400,000 home might expect to bring roughly $236,000 in cash to closing, financing the remaining $164,000 through the reverse mortgage. Entering $400,000 as the current home value and $164,000 as the initial balance drawn in the calculator above shows how that financed portion — not the down payment, which isn't a loan and doesn't accrue interest — grows over the years they expect to stay in the home.
HECM for Purchase vs. Converting Equity You Already Have
Both paths end at the same place — a HECM balance with no required monthly payment that grows over time — but they start from different questions:
- Use H4P whenyou're moving anyway. Downsizing, relocating closer to family, or buying a single-story home that's easier to age in place in are all reasons to combine the move and the reverse mortgage into one closing, rather than buying with cash or a conventional loan and refinancing later.
- Convert equity in your current home whenyou like where you live and don't want to move at all — a standard HECM lets you access cash, a line of credit, or monthly payments against the home you're already in. Our reverse mortgage calculator models that version directly.
- Sell and downsize with a conventional mortgage whenyou'd rather keep a smaller monthly payment than tie up 45-65% of the new home's price in cash — our standard mortgage amortization calculator models how a conventional loan would pay down instead.
There's no universally "better" option — it depends on whether you're moving at all, how much cash you have available for a down payment versus how much you want to preserve, and how comfortable you are with a monthly payment obligation on a fixed income.
Who Qualifies for HECM for Purchase
Eligibility mirrors a standard HECM with a few purchase-specific additions. Per the Consumer Financial Protection Bureau, "there is a 'Home Equity Conversion Mortgage (HECM) for Purchase' loan that allows people 62 and older to purchase a new principal residence with HECM loan proceeds," but you'll need cash on hand to cover the difference between the HECM proceeds and the sales price plus closing costs. The new home must become your primary residence, and — as the CFPB notes — "not all properties are eligible for the HECM for Purchase loan program; for example, cooperative units and some manufactured homes are ineligible." You must also stay current on property taxes, homeowners insurance, and upkeep for the life of the loan, and you can't be delinquent on federal debt. For the full set of general HECM eligibility rules that also apply here, see our reverse mortgage calculator page.
Methodology and Sources
The calculator above uses the same monthly compounding model as a standard reverse mortgage: your entered rate plus ongoing mortgage insurance premium (MIP) compounds against the starting balance each month, with any servicing fee added on top — no principal payments, since none are required. That model is identical whether the starting balance came from converting equity in an existing home or from financing the unfunded portion of a new purchase, which is why this page reuses the same calculator as our standard reverse mortgage calculator. Eligibility details and the purchase-specific mechanics cited above come from the CFPB's guidance on using a reverse mortgage to buy a home. The down payment percentages in the worked example above are illustrative, built from typical current HECM for Purchase principal limit factor patterns rather than a specific lender quote — always confirm exact figures with an FHA-approved HECM for Purchase lender before budgeting against them. If you'd rather explore financing the new home with a conventional loan instead, our refinance amortization calculator and standard amortization methodology page cover that math.
Sukie Gao
Sukie Gao builds independent, ad-free-of-bias financial calculators focused on giving homeowners a clear, honest picture of what a mortgage actually costs over time. MortgageAmortizationCalc.com is written and maintained by Sukie, with every formula checked by hand against published amortization tables before publishing.
More from Sukie →Frequently Asked Questions
There's no fixed percentage. HUD calculates your principal limit from the youngest borrower's age, the interest rate expected at closing, and the lesser of the purchase price or the FHA HECM lending limit — your down payment then covers the gap between that principal limit and the purchase price plus closing costs. In practice, down payments on H4P transactions commonly land somewhere between roughly 45% and 65% of the purchase price, with older borrowers and lower rates both reducing the percentage required. An FHA-approved HECM for Purchase lender can run the exact figure for your age and the day's rates.