Severe Cost Burden
The condition of a household that spends more than half of its income on housing costs, the standard federal threshold for the most acute housing affordability problems.
What Is Severe Cost Burden?
Severe cost burden describes a household that spends more than 50% of its income on housing. It is the upper tier of the broader cost burden measure, which starts when housing takes more than 30% of income.
The U.S. Department of Housing and Urban Development (HUD) and major research centers such as Harvard’s Joint Center for Housing Studies use the same two thresholds. A household paying 35% of its income for rent is cost-burdened. One paying 55% is severely cost-burdened.
How It Works
The calculation divides a household’s housing costs by its gross income:
- Renters: rent plus utilities, often called gross rent
- Homeowners: mortgage payments, property taxes, insurance, utilities, and any condominium or association fees
If the result is above 50%, the household is counted as severely burdened. Researchers usually calculate this from the Census Bureau’s American Community Survey. HUD’s CHAS data, a custom tabulation of that survey, breaks the counts down by income level and location.
Example
Suppose a household earns $3,000 a month and pays $1,450 in rent plus $150 in utilities. Its housing costs are $1,600, or about 53% of income. That household is severely cost-burdened. It has $1,400 left for food, transportation, child care, and everything else.
Why It Matters
Severe burden is a common way to identify the households under the most strain. According to the 2026 edition of The State of the Nation’s Housing from Harvard’s Joint Center for Housing Studies, 22.7 million renter households were cost-burdened in 2024, and 12.1 million of them were severely burdened. Among renters earning less than $30,000 a year, 67% were severely burdened.
HUD uses a related measure in its reports to Congress. Worst case housing needs covers very low-income renters who receive no housing assistance and either pay more than half their income for rent, live in severely inadequate housing, or both. HUD’s 2025 report counted 8.46 million such households in 2023.
Criticisms and Limitations
Like the 30% rule it builds on, severe cost burden is a ratio. It does not show how much money a household actually has left. A high-income household spending half its income on a large home may be comfortable. A low-income household at 45% may not be able to cover basic needs. For that reason some researchers add residual income measures, which estimate whether money left after housing covers other essentials.
Sources
- HUD User — CHAS: Background (definitions of cost burden and severe cost burden) (opens in a new tab)
- Enterprise Community Partners — Five Key Takeaways from the 2026 State of the Nation's Housing Report (summarizing Harvard JCHS data) (opens in a new tab)
- HUD User — Worst Case Housing Needs: 2025 Report to Congress (opens in a new tab)
- HUD PD&R Edge — When the Rent Eats First: Is the Traditional Measure of Cost Burden Still Useful? (opens in a new tab)
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