Area Median Income (AMI) and Its Role in Housing Assistance

Area Median Income (AMI) is the single most consequential eligibility benchmark in the United States federal housing assistance system, determining which households qualify for subsidized programs, at what rent levels, and for how long. Published annually by the U.S. Department of Housing and Urban Development (HUD), AMI figures vary by metropolitan statistical area and household size, meaning the same dollar income can qualify a family in one city while disqualifying them in another. This page explains the structure of AMI, how it is calculated and applied, the scenarios in which it governs access, and the decision points that separate one eligibility category from another. Readers seeking a broader orientation to available programs can begin at the housing assistance overview.

Definition and scope

Area Median Income is the midpoint income figure for a given geographic area — meaning half of all households in that area earn above the figure and half earn below it. HUD calculates AMI for each metropolitan statistical area (MSA) and non-metropolitan county using data drawn primarily from the American Community Survey (ACS), published by the U.S. Census Bureau. HUD then adjusts the raw median for household size, producing a table of income limits calibrated to family compositions ranging from one to eight persons.

The geographic unit of measurement matters significantly. HUD defines Fair Market Rate (FMR) areas that do not always align with city or county political boundaries, and AMI figures follow these FMR boundaries rather than municipal ones. A household straddling two jurisdictions may fall under whichever FMR area HUD has designated for their residential address.

AMI is not a fixed national number. For 2023, HUD reported that AMI for the Washington, D.C. metropolitan area was $142,300 for a family of four (HUD FY2023 Income Limits), while the AMI for a rural Mississippi county in the same year was substantially lower — illustrating how a single national program administers dramatically different eligibility thresholds across regions.

How it works

HUD expresses eligibility as a percentage of AMI. Federal housing programs do not simply divide applicants into "eligible" and "ineligible" — they use a tiered percentage structure that governs program access, rent burden calculations, and benefit levels. The standard percentage thresholds recognized across HUD programs are:

1. Extremely Low Income (ELI): Households at or below 30% of AMI
2. Very Low Income (VLI): Households at or below 50% of AMI
3. Low Income: Households at or below 80% of AMI
4. Moderate Income: Households at or below 120% of AMI (used in some homeownership programs)

Each threshold unlocks different programs or priority classifications within programs. The Section 8 Housing Choice Voucher Program, for example, is statutorily required under 42 U.S.C. § 1437f to serve households at or below 80% of AMI, with at least 75% of new admissions in any fiscal year required to come from households at or below 30% of AMI (HUD Public and Indian Housing).

For rent calculation purposes, assisted housing programs typically set tenant rent contributions at 30% of the household's adjusted gross income — a standard rooted in the Housing Act of 1937 as amended. AMI functions as the ceiling that defines who is eligible, while adjusted gross income determines the actual monthly payment within that eligible population.

HUD updates income limits annually, and a household's AMI percentage can shift year over year even if their income is unchanged, because the AMI benchmark itself moves with regional wage and housing data. The income limits for housing assistance page provides further detail on how these annual updates affect recertification.

Common scenarios

Scenario 1 — Rental voucher application: A family of four in a mid-size metropolitan area earns $38,000 annually. If local AMI is $76,000, that family sits at 50% AMI (Very Low Income) and meets the income ceiling for Housing Choice Voucher eligibility. Their actual voucher amount and rent contribution are then calculated separately based on Fair Market Rents for the area.

Scenario 2 — Low Income Housing Tax Credit (LIHTC) properties: Developers receiving tax credits under the Low Income Housing Tax Credit Program are required by the Internal Revenue Code (Section 42) to reserve units for households at or below either 60% AMI or 50% AMI, depending on which election the owner made at project inception. Tenants in these buildings may earn more than those eligible for direct vouchers, but still qualify for below-market rent because the developer's tax benefit is contingent on income-restricted occupancy.

Scenario 3 — Public housing admission priorities: Local housing authorities administering public housing use AMI thresholds to establish local admission preferences. A housing authority may prioritize ELI households (≤30% AMI) for available units before opening the waitlist to VLI applicants, effectively creating a queue sorted by AMI tier.

Decision boundaries

The distinction between AMI tiers is not merely administrative — it determines access to entirely different programs and governs funding allocation at the federal level. The contrast between 30% AMI and 80% AMI households is particularly consequential:

• Households at ≤30% AMI are the primary statutory target of project-based rental assistance, HUD's Emergency Solutions Grants, and preference categories within the Continuum of Care Program.
• Households between 50%–80% AMI are more likely to qualify for moderate-rehabilitation programs, certain Community Development Block Grant-funded activities under the Community Development Block Grant framework, and employer-assisted housing initiatives.
• Households above 80% AMI are generally ineligible for federal rental assistance, though some state-administered workforce housing programs extend coverage up to 120% AMI.

Income counted toward AMI percentage is not simply gross wages. HUD's methodology for adjusted gross income includes earned income, Social Security and pension payments, and certain asset income, while excluding items such as income of live-in aides and income of full-time students under defined conditions. Applicants whose gross income appears to exceed a threshold may still qualify once applicable exclusions are applied — making the formal calculation distinct from a straightforward comparison of wages to published AMI figures.

The housing assistance eligibility requirements page details how specific program administrators apply these income definitions, and the housing assistance application process outlines how documentation of income is verified during intake.