What Is Area Median Income (AMI)? A Housing Help Guide
AMI is the middle income for your area, set by HUD each year. See how it sets Section 8, public housing, LIHTC and HOME limits for your family size.
KPCB Staff · Oct 21, 2026
By KPCB StaffCombined Expertise In The Low Income Housing Space For 10 Years · How we write our guides

To add someone to your Section 8 voucher, you must ask your public housing agency (PHA) for approval before the person moves in. Your landlord also has to agree in writing. Federal rules say no one but PHA-approved household members may live in the unit, so moving someone in first can put your voucher at risk.
The one exception is a new child. If you have a baby, adopt, or get court-awarded custody of a child, you don't ask permission first, but you must tell the PHA promptly.
HUD's definition of a family is broad. It covers a single person or a group of people living together, "regardless of actual or perceived sexual orientation, gender identity, or marital status." A spouse, boyfriend or girlfriend, adult child, grandchild, parent, sibling or other relative can all be considered.
Your PHA decides whether to approve each person, and it writes its own rules in a document called the Administrative Plan. Some PHAs are stricter than others about who counts as family, so ask for their policy before you assume someone will or won't qualify.
Two kinds of people can live with you without becoming family members, but only with PHA approval:
Even when the PHA approves new members through a quick "interim" update, HUD's Reexaminations guidebook says it still has to verify the new person's Social Security number, criminal background and citizenship or immigration status.
If the new person is 6 or older, or is younger than 6 and already has a Social Security number, you must give the PHA that number when you make the request (or when the PHA processes it). Proof can be:
If you add a child under 6 who doesn't have a number yet, you have 90 calendar days to provide it. The PHA can grant one more 90-day extension if it decides the delay was outside your control and couldn't have been foreseen. The child is counted as part of your household while you wait.
New household members must provide evidence of citizenship or eligible immigration status at the first interim or annual reexamination after they move in. HUD calls a household where some members have eligible status and some don't a "mixed family." If that describes your household, ask your PHA how it handles your case.
Federal rules require PHAs to keep out two groups:
For other criminal history, the PHA has discretion. It may deny someone for drug-related, violent or other criminal activity within what it considers a "reasonable time," and it sets that time period itself. HUD's eligibility guidebook says PHAs may not deny someone based only on arrest records. It also encourages PHAs "to allow ex-offenders to rejoin their families when appropriate" and to consider things like rehabilitation.
If the PHA plans to deny someone because of a criminal record, it must give the family a copy of that record and a chance to dispute whether it is accurate or relevant. For more on screening, see our guide to what Section 8 looks for in a background check.
A PHA may also deny or end assistance if a family member owes money to a PHA, was evicted from federally assisted housing in the last five years, or had Section 8 assistance terminated before.
Only the PHA can approve a new household member, so don't pay anyone who offers to get it done for you.
The PHA counts income from every household member who is 18 or older, plus the head of household and spouse, so adding a working adult usually raises your share of the rent. Adding a child or someone with no income may lower it or leave it the same.
If you reported the change on time under your PHA's rules, the PHA must give you 30 days' notice before a rent increase, and it takes effect on the first of the month after those 30 days. If you didn't report on time, the PHA must charge any increase back to the first of the month after the change happened.
Section 8 income limits are checked when a family is first admitted from the waitlist. Once you're in the program, a higher household income generally means you pay more rent rather than losing the voucher right away. If your income rises to where the PHA pays nothing to your landlord, the payment contract ends automatically 180 days after the last payment. See our guide to Section 8 income eligibility for how the limits work.
Your PHA's "subsidy standards" decide how many bedrooms your voucher covers based on how many people live with you. A larger household may qualify for a bigger voucher size, which can raise the most the PHA will pay. If your household outgrows your current unit, ask the PHA about moving. If you disagree with the PHA's decision about your voucher size, federal rules give you the right to ask for an informal hearing.
Your PHA's Administrative Plan sets its rules for reporting and processing household changes, so ask how long approval usually takes. For interim reexaminations, federal rules say a "reasonable time" should generally be no longer than 30 days after a change in income is reported. Turning in a complete packet the first time helps avoid back-and-forth.
HUD says waitlist applicants must keep their PHA informed of changes to their mailing address, phone number, or household size, and failing to do so may get you removed from the list. If you applied with more than one PHA, update each one. Our guide on confirming your Section 8 application is on the waitlist explains how to check your status.
You must promptly tell the PHA when anyone leaves, such as an adult child who moves out or a partner who leaves. Your PHA's policy sets the deadline. Their income comes off your rent calculation, and your voucher size may go down.
You can't hand your Section 8 assistance to someone outside your household. Federal rules say the family may not sublease the unit, assign the lease or transfer the unit.
If the family breaks up, the PHA decides who keeps the assistance, using the policy in its Administrative Plan. It may consider:
If the breakup results from domestic violence, dating violence, sexual assault or stalking, the PHA must make sure the victim keeps the assistance. If a court divides property in a divorce or separation, the PHA has to follow the court's decision about who stays on the program.
HUD's family definition includes a "remaining member of a tenant family," meaning a household member who stays in the unit after others have left. If the head of household dies or moves out, another adult already approved on the voucher may be able to take over as head of household under the PHA's policy. Contact the PHA as soon as possible. If you're applying to change the head of household after a death, ask the PHA what documents it needs.
HUD defines a guest as someone "temporarily staying in the unit" with your consent. A guest doesn't need PHA approval, but someone who actually lives with you does. Ask your PHA how long a guest may stay under its policy, and check your lease, before a long visit.
Letting someone live with you without approval breaks your family obligations. The PHA can end your assistance for that, and it can deny or end assistance for fraud in connection with any federal housing program. If you are facing termination, the PHA must offer you an informal hearing first. You can find free legal help through LawHelp.org. For more on your rights as a renter, see our guide to landlord and tenant rights.
Often, yes. HUD's family definition doesn't depend on marital status. Your partner goes through the same approval as anyone else: Social Security number, income, citizenship or immigration status, and a criminal background check. Your landlord must also approve in writing.
It depends on your PHA. The federal definition includes "a group of persons residing together," but PHAs write their own policies. Ask your PHA whether it will approve an unrelated adult.
Ask the PHA and your landlord to approve your spouse before they move in. Their income will be counted, so your share of the rent may go up. Being married doesn't by itself end your assistance.
Possibly. Only lifetime sex offender registration and a conviction for making meth in federally assisted housing are automatic bars. For other crimes, the PHA decides using its own policy and how long ago the activity happened, and it must let you dispute the record.
Yes, with PHA approval. A birth, adoption or court-awarded custody only needs to be reported promptly. For other children, such as a grandchild staying with you informally, you need approval first. A foster child also needs PHA approval.
You can't transfer a voucher to someone outside the household. If your daughter is an approved adult member of your household and you move out or pass away, your PHA's policy decides whether she can stay on as head of household.
To see what other help your household may qualify for, try our benefit finder.

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