Mortgages get treated as the responsible exception to the “debt is bad” rule. Buy a house, build equity, write off the interest — what’s not to like? Plenty, actually. The “good debt” label assumes appreciating assets, sustainable payments, and a stable holding period. When any of those conditions fail, a mortgage is just leverage with extra steps.
The “good debt” label hides real risk
Calling mortgage debt good obscures the leverage involved. A 20% down payment means a 5x leveraged bet on local housing. If your home drops 20%, your equity is wiped out. The 2008 collapse wasn’t a freak event — it was what happens when leveraged buyers face a price correction. Most years, housing rises and the leverage works in your favor. But “most years” isn’t “every year,” and the years it doesn’t can take a decade to recover from. Treating a mortgage as risk-free because everyone has one is the same logic that powered the last bubble.
Interest, taxes, and maintenance eat the appreciation
A 7% mortgage at today’s rates means you’re paying roughly the loan amount in interest over 30 years. Add property taxes (1–2% annually), insurance, maintenance (typically 1–3% of value per year), and closing costs on both ends, and the all-in cost of ownership often exceeds renting plus investing the difference. The mortgage interest deduction, which once made the math better, was gutted for most filers by the 2017 tax law’s higher standard deduction. The “you’re throwing away money on rent” framing ignores the substantial money owners throw away on interest, repairs, and transaction costs.
Short holding periods make it worse
Buying makes financial sense over long horizons in stable markets. It rarely makes sense if you’ll move in three to five years. Realtor commissions alone (5–6% on sale) can erase years of principal paydown. Job changes, relationship shifts, neighborhood deterioration, or simple buyer’s remorse all force sales at inopportune times. The traditional advice to “get on the property ladder as soon as possible” assumes you’ll stay long enough for appreciation and amortization to outrun transaction costs. For mobile workers and uncertain life stages, that assumption doesn’t hold.
When mortgage debt actually is good
A mortgage is genuinely good debt when the payment is comfortably affordable, the rate is locked at a reasonable level, you plan to stay 7+ years, and you’ve stress-tested your finances against job loss or major repairs. Under those conditions, the inflation hedge of a fixed-rate loan is real and the forced-savings effect of principal paydown is meaningful. Outside those conditions, you’re just renting from the bank with extra responsibilities.
The takeaway
Mortgage debt deserves more scrutiny than the “good debt” label invites. Run the actual numbers against renting plus investing, factor in realistic holding periods, and stress-test the payment. Some mortgages are excellent. Others are leveraged bets dressed up as adulthood. The label doesn’t tell you which one yours is.
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