Every affordable unit in New York City is defined by a number: the percentage of Area Median Income it serves. That figure sets the rent you can charge and the households who qualify to live there. For developers and owners, understanding AMI is the difference between underwriting affordable units accurately and getting the math wrong. Here’s how it works.
What Area Median Income (AMI) actually is
Area Median Income (AMI) is the household income at the midpoint for the New York City metropolitan region — half of households earn more, half earn less. It is published annually by HUD and adopted by HPD and HDC, and it is adjusted for household size, so the dollar figure for a single person is lower than for a family of four.
Two points matter for planning. First, AMI is a regional figure, not a neighborhood one — the same AMI applies whether you build in the Bronx or in lower Manhattan. Second, because it is updated each year, the dollar amounts behind any given percentage move over time. Always work from the current year’s published AMI schedule rather than figures you’ve carried over from a prior project.
How AMI bands set affordable rents
Affordable programs express affordability as a percentage of AMI — commonly bands such as 40%, 60%, 80%, and 130%. A lower band means a lower income ceiling and a lower rent; a higher band serves moderate- and middle-income households at higher rents.
Each band maps to a maximum income and, in turn, a maximum affordable rent. Rents are generally set so that housing costs stay at roughly 30% of the band’s income, with a utility allowance subtracted when tenants pay their own utilities. Programs like §485-x typically require affordable units at a weighted average of AMI — for example, a weighted 60% or 80% across the affordable set — which lets a building combine deeper- and shallower-affordability units as long as the average lands where the program requires.
Because the underlying AMI changes annually, the specific dollar rents tied to each band change too. Treat any rent table as a snapshot of one year.
Minimum and maximum income for a unit
Affordable units carry two income tests, and applicants must fall between them:
- A maximum income, set by the unit’s AMI band and household size, that caps who is eligible. Earn above it and you don’t qualify for that unit.
- A minimum income, designed to show the household can sustain the rent. This is often derived from the rent itself — frequently expressed as a multiple of annual rent or tied to a rent-to-income ratio.
The minimum is the part developers most often overlook. A unit can be “affordable” on paper yet still require a household to earn a floor amount to be approved, which is why the same apartment serves a fairly narrow income window rather than anyone below the cap.
How household size affects eligibility
Both the income limits and the unit a household qualifies for depend on household size. AMI limits are published as a grid of percentage band by number of people, so a four-person household has a higher maximum income than a one-person household at the same band.
Household size also drives occupancy standards — the number of people expected in a studio, one-bedroom, or two-bedroom. A household that is too large or too small for a given apartment may be passed over for that unit even if its income fits, and routed instead toward an appropriately sized one. When you plan a building’s affordable unit mix, you are effectively choosing which household sizes and income ranges you’ll serve.
Putting it together for a project
For a developer, AMI analysis comes down to a few practical questions:
- Which bands does your program or incentive require, and at what weighted average?
- What rents do those bands support this year, after utility allowances?
- Which household sizes match your unit mix, and do the resulting income windows produce a realistic applicant pool?
- Have you rechecked the figures against the current year’s published AMI before relying on them?
Getting these right at the design stage keeps your affordable rents, your eligible-tenant pool, and your incentive requirements aligned — before they’re locked into a regulatory agreement.
Bottom line
AMI is the unit of measurement for NYC affordable housing: a regional, annually updated, household-size-adjusted figure that sets both the rent you can charge and the households who qualify. Income bands translate AMI into maximum incomes and affordable rents, while minimum-income rules and occupancy standards narrow who actually fits each apartment. Because the dollar amounts move every year, the discipline is to plan from the current AMI schedule. At Sterea, we model AMI bands, rents, and eligibility alongside the marketing and compliance work as one coordinated effort.
This article is for general informational purposes and is not legal, tax, or financial advice. Rules change and the specifics vary by property — consult a qualified professional about your situation.