What drives housing affordability besides prices?

The short answer

Most popular discussions reduce affordability to the headline price tag of a home. This observation aligns with which large cities are cooling. That framing misses what actually determines whether a household can carry the property month after month. Affordability is a function of five inputs: the price of the home, the mortgage rate at financing, property taxes, insurance, and household income. Each of these can move independently, and a single one swinging hard can erase years of progress.

This is why two homes with identical sticker prices in different states or different years can require radically different shares of household income to maintain. A house that was affordable in 2021 at a 3% mortgage rate becomes unaffordable in 2024 at 7%, even with no price change at all.

The Atlanta Fed’s Home Ownership Affordability Monitor (HOAM) is the reference framework for this multi-variable view. It tracks the share of median household income absorbed by total ownership cost — a much richer signal than price-to-income alone.

→ New to this framework? Everyday financial tradeoffs in economic regimes

What the data shows

The HOAM index from the Atlanta Fed (data through 2025) shows U.S. homeownership has been the least affordable since the index began in 2006:

• The median-priced home consumed 47.7% of median household income as of mid-2025, well above the 30% HUD threshold
• The income required to qualify for a median-priced home reached $119,640 in August 2024 — 40.3% above the actual median household income of $85,255
• The 30-year fixed mortgage averaged 6.22% in early November 2025, down from a peak of 7.79% in October 2023, but still more than double the 2.65% trough of January 2021
• HUD reports homeownership was unaffordable in 17 U.S. states in Q1 2025, against only one (California) in Q1 2020
• Zillow estimates the U.S. national housing deficit at roughly 4.7 million units, providing a structural floor under prices

The exception worth noting: real wage growth has partly offset the damage. Median household incomes rose meaningfully in 2022–2024, and without that nominal income gain the affordability collapse would have been even sharper.

→ Dataset: U.S. real housing price index

Why it happens — the macro mechanism

Affordability is not driven by a single variable but by the multiplicative interaction of five. Each channel matters in its own right.

Mortgage rate channel. A move from 3% to 7% on the 30-year fixed roughly doubles the monthly principal-and-interest payment for the same loan amount. The CFPB documented that this rate move alone added roughly $1,265 to the monthly payment on a $400,000 loan, a 78% increase from trough to peak. Rates dominate when they swing fast.

Property tax and insurance channel — often underestimated. Property insurance costs have surged in climate-exposed states, with the Treasury’s Federal Insurance Office reporting non-renewal rates 80% higher in highest-risk ZIP codes. Property taxes have followed reassessments tied to the 2020–2022 price surge. Together, these two have contributed nearly as much to the affordability decline since 2020 as the rate move itself.

Income channel. Median household income growth offsets the other costs but rarely keeps pace during fast rate cycles. The income gap between qualified and actual income reached 40% in 2024 — historically anomalous.

Synthesis by regime. In the 2010–2019 disinflation regime, low rates (~3.5%) and modest price growth kept HOAM consistently above 100 (affordable). In the 2020–2022 transition, the price surge dominated while rates were still low — affordability eroded but did not collapse. In the 2022–2026 high-rate regime, all five channels turned adverse simultaneously: prices stayed sticky thanks to the lock-in effect, rates more than doubled, insurance and taxes climbed, and only income growth pushed the other way. The transition was clearest when the 30-year mortgage crossed 5% in mid-2022.

Affordability is not a price problem — it is a system equation, and the variable that moves fastest tends to set the binding constraint.

→ Framework: Real estate, credit and rate cycles

What it means for different economic actors

First-time buyers. Bear the full weight of the multi-variable squeeze. They lack home equity to roll forward and face the qualified-income gap directly. NAR data shows first-time buyers fell to 24% of the market in 2024, a record low.

Existing homeowners. Largely shielded by the lock-in on their pre-2022 mortgage rates, but their wealth becomes paper rather than spendable as transaction friction rises and refinance windows close.

Local governments. Property tax revenues remain elevated thanks to assessed values, but the climate-insurance crisis introduces a new fiscal channel where insurer pullback can erode tax bases.

A common error is to track only price-to-income ratios. The HOAM framework shows that even with stable prices, rate moves and insurance shocks can flip a market from affordable to unaffordable within months.

Practical observation

Go deeper

Related questions

• How does the 30-year fixed mortgage shape U.S. housing markets?
• What is the lock-in effect and how does it freeze housing markets?
• What is the price-to-rent ratio and what does it tell us?
• How do real estate cycles interact with interest rates?

Frequently asked questions

Is the price-to-income ratio sufficient on its own?

No. Price-to-income captures only two of the five variables that determine whether a household can carry a property. The same ratio can produce vastly different affordability outcomes depending on prevailing mortgage rates, local property taxes and insurance costs. A price-to-income of 4.5x is comfortable at 3% mortgage rates and crushing at 7% — the rate variable transforms the calculation. The Atlanta Fed HOAM index addresses this by integrating all relevant cost components into a single share-of-income measure benchmarked against the HUD 30% affordability threshold.

How much have insurance and tax increases contributed to the affordability collapse?

This is the underestimated channel. Property insurance premiums have risen sharply in climate-exposed regions, with the U.S. Treasury Federal Insurance Office reporting non-renewal rates 80% higher in highest-risk ZIP codes. Property taxes have escalated through reassessments tied to the 2020–2022 price surge. Combined, these two carrying costs have contributed nearly as much to HOAM deterioration since 2020 as the mortgage rate move itself in some metros. They are sticky on the way down: rate cuts can lower one channel but rarely reverse insurance or tax escalation.

Can affordability return to historical norms without prices falling?

The arithmetic is challenging. With the U.S. housing deficit estimated at 4.7 million units (Zillow), prices face a structural floor. Returning the HOAM to its pre-2022 territory of 100+ would require some combination of: a meaningful drop in 30-year mortgage rates (toward 5%), continued nominal wage growth, and stabilization of insurance costs. Most projections suggest a multi-year normalization rather than a sharp reversal. The historical episode of 2006–2012 saw prices fall ~30% in some metros to restore affordability — but that path required a credit crisis and is unlikely to repeat given current bank capital positions.

Last updated — 18 June 2026