The spreadsheet answer is simple. The real answer depends on more than the math.
Marcus Webb, 66, paid off his $380,000 mortgage the month he retired. For a few weeks it felt like the right call. Then the market dropped, his portfolio fell with it, and the cash he'd used to eliminate a 3.2% loan was gone, unreachable without selling the house or taking out a HELOC.
Kevin Lum hears versions of Marcus's story often. The spreadsheet math is usually simple: a 3-4% mortgage against a portfolio that's historically returned 8-10% favors keeping the loan and investing the difference. But retirees don't live inside an average. A downturn at the wrong moment can turn a strategy that looked smart on paper into a real problem.
This isn't a fringe question. According to a May 2024 New York Fed report, roughly 75% of debt held by Americans age 70 and older is mortgage debt, and more retirees are carrying mortgages into retirement than in previous generations.
In his video Why a Paid-Off Home Might Actually Hurt Your Retirement, Kevin walks through the variables that determine whether paying off a mortgage helps or hurts a plan, plus a side-by-side look at two retirees who made opposite choices with the same size portfolio. Below is that framework broken into six questions.
1. Where Would the Money Actually Come From?
Before deciding whether to pay off a mortgage, the more useful question is where the payoff money is sitting. A taxable account, a Roth IRA, a traditional IRA, and a 401(k) are not interchangeable sources, because pulling from a tax-deferred account changes the entire calculation. The account type determines what it costs to access the money, and that cost has to be known before the payoff-versus-invest debate can be settled.
Ask yourself: Do I know exactly which account the money to pay off my mortgage would come from?
2. What Is the Fixed-to-Flexible Spending Ratio?
A mortgage that's a small share of overall spending behaves very differently than one that dominates the budget. If a mortgage is 40% of a retiree's annual spending capacity, say $40,000 of $100,000 a year, a market downturn leaves far less room to adjust, since that payment comes out whether the market is up 20% or down. The larger a mortgage looms relative to total spending, the more keeping it invested increases exposure to sequence-of-returns risk.
Ask yourself: How much of my monthly spending is locked into this mortgage payment, and could I flex around it if I needed to?
3. What Would Actually Happen in a Down Market?
Plenty of retirees say they'd stay invested through a downturn, or that they're holding cash to buy into the next crash. Fewer actually do it. The more reliable predictor is past behavior: did they sell during 2008? Panic-sell in March 2020? Sit out a 15% pullback? A retiree with a track record of selling at the wrong time is taking on more risk than the spreadsheet shows, because the arbitrage only holds up if the money stays invested through the worst of it.
Ask yourself: Based on what I've actually done in past downturns, not what I intend to do, would I stay invested?
4. What Is the Money Doing If It Isn't Going Toward the Mortgage?
Keeping a mortgage only makes sense if the money that would've paid it off is actually working somewhere. Money in a diversified portfolio earning 7-10% supports the arbitrage argument. Money parked in a 4% money market account closes most of the gap and may not be worth the added complexity. Some retirees are comfortable leaving that money invested through volatility, while others only feel comfortable if it's in fixed income so it can pay off the mortgage if a downturn hits.
Ask yourself: If I'm not paying off the mortgage, do I know exactly where that money is invested and what it's earning?
5. The Two-Retiree Case Study: What Happens When the Market Drops 20 Percent?
Consider two retirees, both starting retirement with a $2 million portfolio and a $400,000 mortgage at a low fixed rate.
The first pays off the mortgage in full, leaving $1.6 million invested, and feels immediate relief with no more payment due. Eighteen months later, the market drops 20%, her roof needs replacing, and a health event adds $40,000 in costs. With $400,000 locked into home equity and unreachable without selling the house or taking out a HELOC, every expense now competes with a smaller portfolio for cash. What felt like peace of mind starts to feel like being squeezed by every bill.
The second keeps the mortgage and invests the $400,000 alongside his $1.6 million. His portfolio takes a bigger paper hit when the market drops 20%, since he has more invested, but he still has that $400,000 in liquidity. When the same roof and health expenses show up, he has options: draw from the portfolio, tap a reserve, or delay the discretionary repairs. The mortgage is still due every month, but so is the flexibility to absorb a shock without selling assets at a loss.
Neither retiree made the wrong choice on paper. The one who's better off is the one whose choice matched how much liquidity, and how much stress, they could actually tolerate.
Ask yourself: If I lost access to a large chunk of my liquidity tomorrow, could I comfortably cover an unplanned $30,000-$40,000 expense?
6. Is This a Net Worth Decision or a Peace-of-Mind Decision?
Retirement is less about maximizing net worth and more about minimizing regret. For some, the regret is leaving money on the table by being too conservative. For others, it's carrying a mortgage that feels like it's hanging over their heads, reducing the sense of freedom retirement is supposed to bring. Neither instinct is wrong, but not every decision can be settled on a spreadsheet. Simplicity and flexibility tend to win over pure optimization, because flexibility is what protects a plan when life doesn't go to script.
Ask yourself: Am I chasing the highest number on paper, or the plan that actually lets me sleep at night?
Retirement Mortgage Readiness Checklist
Watch the Full Breakdown
Kevin Lum walks through all five variables in Why a Paid-Off Home Might Actually Hurt Your Retirement, including the tax mechanics of tapping a tax-deferred account and a closer look at the liquidity math. The Retirement Made Simple podcast covers the same practical, jargon-free ground in longer form.
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Working through these questions alone is a great start. But a mortgage payoff decision touches taxes, liquidity, sequence-of-returns risk, and Medicare costs at once, which is why most retirees benefit from running their numbers with someone who can see the full picture.
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Frequently Asked Questions About Retirement Mortgage Decisions
Can paying off your mortgage hurt your retirement?
It can, depending on where the money comes from, how much liquidity is left afterward, and how a retiree behaves in a downturn. A 2024 New York Fed report found that roughly 75% of debt held by Americans over 70 is mortgage debt, and paying it off with a large lump sum can remove flexibility exactly when a market drop or unplanned expense makes it most valuable. Keeping a low-rate mortgage and investing the difference wins in many cases, but only if the money stays invested and enough liquidity remains.
Should retirees keep a low-rate mortgage and invest the difference?
It depends on spending flexibility, tax situation, and honest history with market downturns. A mortgage that's a large share of monthly spending increases exposure to sequence-of-returns risk, and a retiree with a history of selling during downturns rarely sees the arbitrage work out in practice as well as it does on paper.
What is sequence-of-returns risk and why does it matter here?
It's the risk that a downturn early in retirement, combined with ongoing withdrawals, damages a portfolio more than the same downturn would later on. A retiree who keeps a mortgage and invests the difference is more exposed than one with lower fixed costs, because rigid spending plus a market drop forces harder choices.
How much liquidity should a retiree keep after a mortgage decision?
There's no universal number, but the more a payoff shrinks liquidity relative to total assets, the more it matters. A retiree with $8 million and a $500,000 mortgage will barely notice paying it off; one with $1.6 million left after a $400,000 payoff has a much thinner cushion for a health event or major repair.
Does it matter which account the mortgage payoff money comes from?
Yes. Withdrawing from a tax-deferred account like a traditional IRA or 401(k) means every dollar is taxed as ordinary income, so a $400,000-$500,000 payoff might require withdrawing $600,000-$700,000 depending on tax bracket. That withdrawal can also trigger Medicare IRMAA surcharges and reduce room for Roth conversions.
Kevin Lum, CFP® | Retirement Made Simple
This article is companion content to the Retirement Made Simple YouTube channel. It is for informational purposes only and does not constitute personalized financial advice.
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