The Housing Continuum, Explained

The housing continuum is a way of laying out every kind of housing a community needs on a single line. It runs from emergency shelter for people with nowhere to sleep, through supportive and subsidized housing, to income-restricted rentals, workforce housing, and finally market-rate rentals and homeownership. Each rung is usually matched to a band of area median income (AMI), the midpoint income HUD publishes every year for each metro area and non-metro county.

The continuum is useful because it shows two things at once: who each kind of housing is for, and which public programs pay for it. Laid side by side, those two views reveal where a community’s options run thin. Nationally, the thinnest spots are at the very bottom, where the need is deepest, and in the middle, where workforce households earn too much for most subsidies but too little for the local market.

What the Continuum Is, and What It Is Not

The continuum is a planning framework, not a law or a program. Colorado’s Division of Housing, for example, uses a continuum graphic developed by the Colorado Housing and Finance Authority that aligns income levels, expressed as a percentage of AMI, with the types of housing commonly affordable at each level. The division notes that the general progression holds in most communities: rentals tend to be affordable at lower incomes than homes for sale, and permanent supportive housing tends to serve the lowest incomes.

Two cautions apply. First, the AMI bands attached to each rung are rules of thumb. They differ by place and by program. Second, the continuum should not be confused with a HUD Continuum of Care, which is a federal homelessness program and the local planning body that applies for it. A Continuum of Care covers only the crisis and supportive end of the housing continuum.

The Rungs at a Glance

The table below summarizes the typical rungs. The income bands are approximate. Federal income categories are extremely low income (at or below 30% of AMI or the poverty guideline, whichever is higher), very low income (at or below 50%), and low income (at or below 80%).

Crisis Response and the Path Out of Homelessness

At the bottom of the continuum is emergency shelter. HUD’s Emergency Solutions Grants (ESG) program can pay for five components: street outreach, emergency shelter, homelessness prevention, rapid re-housing, and the data systems that track homeless services.

The Continuum of Care Program funds the next steps. Under its regulations, it pays for:

• Transitional housing — up to 24 months of housing with supportive services
• Rapid rehousing — short-term (up to 3 months) or medium-term (3 to 24 months) rental assistance plus services to move people into permanent homes quickly
• Permanent supportive housing — housing with no set length of stay, paired with services, for people with disabilities or families with a member who has a disability

A detail matters here. For HUD’s annual point-in-time count, people living in rapid rehousing or permanent supportive housing are not counted as homeless, while people in transitional housing are.

These rungs are also where federal policy is changing fastest. According to the Congressional Research Service (CRS), HUD has not funded new transitional housing projects since FY2012. HUD’s FY2026 funding notice reversed course, setting aside $1.3 billion of $4.04 billion for new grants prioritized for transitional housing and services-only projects, away from permanent housing. The notice was challenged in court. A federal court vacated it on August 7, 2026, and on September 16, 2026, a federal appeals court put that ruling on hold while HUD’s appeal proceeds, which allows the notice to go forward. That was the status as of CRS’s September 18, 2026 update.

Deeply Subsidized Rental Housing

The next rung serves the lowest-income renters through three main federal programs: public housing, the Housing Choice Voucher Program, and project-based rental assistance. What sets them apart is that the tenant’s rent rises and falls with income. Federal law generally sets the resident’s payment at the highest of 30% of monthly adjusted income, 10% of monthly gross income, or a welfare-based amount.

Federal law also targets these programs at the bottom of the income scale:

• Vouchers go primarily to very low-income families, and at least 75% of new voucher admissions each year must be extremely low-income.
• Public housing is open to low-income families, but at least 40% of newly available units each year must go to extremely low-income families.
• Project-based Section 8 properties must lease at least 40% of units that become available each year to extremely low-income families.

These programs are not entitlements. Only some eligible households receive help, which is why waiting lists are common.

Income-Restricted Affordable Rentals

Most new affordable apartments built today sit on this rung. They are financed mainly by the Low-Income Housing Tax Credit (LIHTC), often combined with other public funds.

• LIHTC properties must meet an income test, such as at least 40% of units for households at or below 60% of AMI. Under the income-averaging option, individual units can serve households up to 80% of AMI as long as the designated limits average 60% or less.
• The HOME Investment Partnerships Program limits its rental housing and rental assistance to households at or below 80% of AMI, and at least 90% of those units and households must be at or below 60%. For HOME homebuyer assistance, a July 2026 law (Public Law 119-101) raised the income limit from 80% to 100% of the area median.
• The National Housing Trust Fund is targeted lower. By statute, at least 75% of its rental money must benefit extremely low-income households, and the rest very low-income households. HUD’s rule is stricter in any year when the fund’s national total is below $1 billion: all of a grantee’s money must then benefit extremely low-income households.

There is an important limit. LIHTC rents are capped at 30% of the unit’s income limit, not 30% of the tenant’s actual income. A household far below the limit can still pay more than it can afford unless it also holds a voucher. That is one reason the deep-subsidy and tax-credit rungs often overlap in the same building.

Workforce Housing: The Middle Rung

Workforce housing generally means homes for households earning roughly 60% or 80% up to 120% of AMI. A widely cited definition from the Urban Land Institute uses 60% to 120%. The households include police officers, firefighters, teachers, health care workers, and retail clerks who, as the UNC School of Government notes, may not always qualify for LIHTC apartments or vouchers.

No federal program is dedicated to this band. Above 80% of AMI, households are outside the income limits of nearly every federal rental program. The 21st Century ROAD to Housing Act (Public Law 119-101), enacted July 11, 2026, directs the Government Accountability Office to study housing for middle-income households, defined as above 80% and up to 120% of the area median, and to recommend a federal definition of workforce housing within one year.

For now, communities fill the rung with:

• Older, unsubsidized apartments that rent at moderate prices, known as naturally occurring affordable housing
• Inclusionary zoning, which requires or rewards below-market units in new private developments
• Employer-assisted housing, state workforce housing programs, and local housing trust funds
• Smaller, lower-cost housing types such as cottages, townhomes, and accessory dwelling units

Assisted Homeownership

For many households, the step after renting is buying. Several programs reach into the workforce band here:

• Down payment assistance from state and local agencies helps cover upfront costs.
• Mortgage revenue bonds fund below-market loans for buyers who generally have not owned a home in the past three years. Federal tax law caps borrower income at 115% of the applicable median family income, or 100% for households of one or two people, with higher limits in some targeted areas.
• USDA Section 502 loans serve rural buyers. Direct loans require income at or below the low-income limit at approval, while guaranteed loans are available up to 115% of area median income.
• FHA-insured home loans have no income ceiling. They help buyers with smaller down payments or limited credit.
• A community land trust keeps homes affordable over time by owning the land and limiting resale prices.

Market-Rate Housing

At the top of the continuum is market-rate housing: rentals and homes priced by the private market without income restrictions. Where homes are plentiful relative to demand, many workforce households rent or buy here without assistance. When supply is short, competition pushes prices up, and households who would otherwise rent or buy at market rates compete for the rungs below.

Where the Gaps Sit

The National Low Income Housing Coalition (NLIHC) measures how many rental homes are both affordable and actually available (not occupied by a higher-income household) for renters at each income level. Its March 2026 report, based on 2024 Census data, found:

The national shortage for extremely low-income renters was 7.2 million homes. Cumulatively, the shortfall reached nearly 8.3 million homes for all renters at or below 50% of AMI, then shrank to about 3.2 million at 80% of AMI and roughly 419,000 at 100%.

Two lessons follow. The largest and most persistent gap is at the bottom, where rents low enough to be affordable generally cannot cover the cost of building or operating housing without subsidy. NLIHC also found that most extremely low-income renters live in homes priced for higher-income households, crowding the rungs above them.

The middle-income gap is different. National totals suggest renters near median income have close to enough homes in aggregate, but those figures do not capture location, unit size, or homeownership. In high-cost and resort areas, workforce households often cannot find homes near their jobs, and the barrier to buying a first home can be steep. A local housing needs assessment is the usual tool for measuring these gaps rung by rung.

Debates About the Continuum Model

The continuum is a helpful map, but it has critics:

• It can imply a required sequence. Older homelessness systems often required people to move through shelter and transitional housing before qualifying for permanent housing. Housing First instead places people directly into permanent housing and offers services without preconditions. HUD’s FY2025 and FY2026 homelessness funding notices revived this debate. The FY2026 notice shifts new money toward transitional housing and awards competition points to projects that provide treatment and recovery services and require participation in supportive services.
• It can hide overlap. A single building may combine vouchers, tax credits, and market-rate units, which serve several rungs at once.
• It can obscure local variation. The same AMI band can mean very different rents in different markets.

The Bottom Line

The housing continuum lines up every type of housing, from emergency shelter to market-rate homeownership, against the incomes it serves and the programs that fund it. Federal rental subsidies are concentrated at the bottom, yet the shortage there remains the most severe. The workforce band in the middle has few dedicated federal tools and depends on local policy, employers, and homeownership programs. To see where your own household falls, start with HUD’s income limits for your area.