What is Area Median Income (AMI)?
Area Median Income (AMI) is the midpoint household income for a specific geographic area, calculated annually by HUD, where half of the households earn more and half earn less.
While AMI is commonly used, HUD’s official term is actually Median Family Income (MFI). Both are generally synonymous but when reading through HUD material, they may also use MFI. For the purposes of this article, we will use AMI.
How do I find my AMI?
The U.S. Department of Housing and Urban Development (HUD) publishes updated AMI income limits every year on its official website (huduser.gov). To look up your figures, you’ll need two pieces of information: your metropolitan area or county, and your household size.
What Is AMI Used For?
AMI functions as the universal yardstick for affordable housing programs, but its applications are remarkably diverse. Let’s break down where you’ll encounter AMI in your daily work.
Income Eligibility Determination
This is the most common use we see. AMI establishes the income ceilings for program participation. A LIHTC property might restrict units to households earning no more than 60% of AMI, while a public housing authority could set limits at 50% or 80% depending on the program. When you’re reviewing applications, you’re constantly translating actual household income into AMI percentages to determine eligibility.
Rent Calculations and Limits
In many affordable housing programs, AMI doesn’t just determine who can live there, it also caps what they can be charged. LIHTC properties use AMI-based formulas to establish maximum rents. For instance, a unit restricted to 60% AMI typically can’t charge more than 30% of 60% of the area median income (adjusted for household size). Understanding this relationship is crucial for setting compliant rent schedules.
Program Design and Funding Allocation
Federal agencies, state housing finance authorities, and local governments use AMI to structure their programs. When HUD designs a new initiative or your state allocates tax credits, they’ll specify target populations using AMI percentages. A program might prioritize “extremely low-income” households at 30% AMI or “low-income” households at 80% AMI. These designations determine where funding flows and which developments get approved.
Tiered Subsidy Structures
Many voucher and rental assistance programs calculate subsidy amounts based on household income as a percentage of AMI. A family at 25% of AMI might receive deeper subsidies than one at 70% of AMI. We use these tiered structures to ensure assistance is proportional to need.
Compliance Monitoring and Reporting
For occupancy specialists and compliance officers, AMI is central to ongoing monitoring. You’re required to recertify tenant incomes annually in most programs, comparing them against current AMI figures to ensure continued eligibility. Your reports to funding agencies, investors, and regulators all reference AMI percentages. Maintaining accurate documentation of how household incomes relate to AMI is essential for audits and continued funding.
Mixed-Income Property Requirements
Developments often blend units at different AMI levels, some at 30%, others at 60%, and perhaps market-rate units as well. AMI helps us structure these mixed-income communities in ways that satisfy funding requirements while creating economically diverse neighborhoods.
How is Area Median Income (AMI) calculated?
Understanding how AMI is calculated gives you insight into why the numbers shift annually and how they vary so dramatically between markets.
HUD calculates AMI figures annually for every metropolitan area and non-metropolitan county in the United States. The process starts with data from the American Community Survey (ACS), conducted by the U.S. Census Bureau. This survey collects income data from households across the country, providing the raw numbers that feed into AMI calculations.
For each geographic area, HUD identifies the median gross income of all households, that’s the midpoint where half of households earn more and half earn less. But the calculation doesn’t stop there. HUD then adjusts these figures based on household size, recognizing that a family of four needs more income than a single individual to achieve the same standard of living.
The adjustments follow a specific formula. A one-person household’s income limit is set at 70% of the four-person limit, while a two-person household sits at 80%. Three-person households are at 90%, and the four-person figure serves as the baseline (100%). Five-person households get 108%, six-person households receive 116%, and so on. These standardized adjustments ensure consistency across all housing programs.
Geographic variations make a huge difference. San Francisco’s AMI for a four-person household in 2026 might exceed $150,000, while a rural county in the Midwest could have an AMI under $60,000. That’s why eligibility and rent limits vary so dramatically between markets, they’re responding to radically different local economic conditions.
Income Limits
HUD also applies income limits that prevent AMI-based calculations from becoming unreasonably high in expensive markets. These caps ensure that “low-income” designations remain meaningful even in areas with extremely elevated median incomes. We’ve seen situations where these caps significantly impact eligibility in high-cost coastal cities.
How Often is AMI Updated?
Every spring, HUD releases updated AMI figures, typically in April or May. As housing professionals, we need to carry out these new limits promptly. That means recalculating rent limits, reviewing current tenant incomes for continued eligibility, and updating all our documentation and systems.
The calculation methodology occasionally changes. HUD periodically refines its approach based on new data sources or policy adjustments. Staying informed about these methodological shifts, through professional development and certifications like those offered by NCHM, ensures we’re always working with the most current and accurate understanding of how AMI functions in our programs.
For our day-to-day work, we don’t need to recalculate AMI ourselves, HUD publishes comprehensive tables we can reference. But understanding the calculation process helps us explain limits to applicants, troubleshoot unusual situations, and maintain the deep program knowledge that separates truly effective housing professionals from those just going through the motions.
Frequently Asked Questions About AMI (Area Median Income)
- What is AMI and why is it important in affordable housing?
AMI (Area Median Income) is the foundational benchmark that determines income eligibility for affordable housing programs. It’s critical because it standardizes how housing professionals verify tenant eligibility, maintain compliance, and allocate limited housing resources fairly across communities. - How is Area Median Income calculated?
HUD calculates AMI annually using income data from the U.S. Census Bureau’s American Community Survey. It identifies the median household income for each geographic area, then adjusts figures by household size using standardized formulas (70% for one-person, 80% for two-person, etc.). - What are the main uses of AMI in affordable housing programs?
AMI establishes income eligibility limits, determines maximum rent charges in programs like LIHTC, structures tiered subsidy programs, guides program design and funding allocation, and enables compliance monitoring. It’s also used to create mixed-income communities at varying AMI percentages. - When does HUD release new AMI figures, and what should housing professionals do?
HUD typically releases updated AMI figures each spring (April or May). Housing professionals must promptly implement new limits by recalculating rent limits, reviewing tenant incomes for continued eligibility, and updating all documentation and systems. - Can a tenant’s housing eligibility change without their income increasing?
Yes. When HUD releases updated AMI figures annually, a household’s eligibility status can shift overnight. A tenant who qualified at last year’s AMI threshold might suddenly exceed income limits if the benchmark increased, even if their actual income didn’t change.