Two numbers drive almost every Section 8 rent calculation: the Fair Market Rent (FMR), published by HUD, and the payment standard, set by your local PHA. They are closely related but they are not the same, and misunderstanding the difference can cost you hundreds of dollars a month.

What is Fair Market Rent (FMR)?

FMR is HUD's estimate of the 40th-percentile rent for standard-quality units in a given metro area (Core Based Statistical Area, or CBSA), adjusted for bedroom count. The 40th percentile was chosen to target units affordable to moderate-income renters without pushing vouchers into luxury segments.

FMR is published every year for each CBSA and county, in five bedroom sizes (0BR through 4BR). In 2024, HUD also phased in Small Area FMR (SAFMR) for many large metros, FMR computed by ZIP code rather than metro-wide. SAFMR produces a more accurate picture in neighborhoods where rents vary sharply by submarket.

What is a payment standard?

The payment standard is the maximum subsidy the PHA will pay for a given bedroom size. HUD rules let each PHA set its payment standard between 90% and 110% of FMR without special approval. PHAs may set higher "exception payment standards" for specific ZIPs or the entire jurisdiction, subject to HUD approval, typically to combat deconcentration of poverty.

In practice, a PHA might peg its payment standard at 100% of FMR, 105% of FMR, or 110% of FMR depending on local market conditions and PHA policy.

How FMR becomes your rent portion

The rent math works roughly like this:

1. You find a unit you want to rent. Total rent = $2,000.
2. The landlord agrees to the HAP contract and the unit passes HQS inspection.
3. The PHA's payment standard for that bedroom size is, say, $1,800.
4. Your "Total Tenant Payment" (TTP) is capped at 30% of your adjusted monthly income. Say your adjusted income is $1,500/month, TTP = $450.
5. The HAP (Housing Assistance Payment) is: Payment Standard − TTP = $1,800 − $450 = $1,350.
6. Your actual out-of-pocket rent = Total Rent − HAP = $2,000 − $1,350 = $650.

Two things to notice: (a) if the rent exceeds the payment standard, you pay the difference in addition to your TTP, and (b) at initial lease-up, you cannot pay more than 40% of your adjusted income toward rent. The 40% rule restricts how far above the payment standard you can go on your first voucher move.

The gap we publish

PlainVoucher's voucher-vs-market-rent gap pages show how the HUD 2-bedroom payment standard stacks up against advertised 2-bedroom rents (via our sister site, PlainRent). A positive gap means the voucher falls short of the market rent, tenants pay the difference out of pocket or must find lower-rent units. A negative gap means the voucher covers the market.

Gap percent is computed as: (PS − market rent) / market rent × 100. A -15% gap means vouchers cover 15% more than advertised market rent; a +20% gap means vouchers fall 20% short of market.

Why the gap matters

In high-cost coastal metros, the gap is frequently +25% to +45%, meaning voucher holders often can't find ANY unit at the payment standard without paying out of pocket. In softer markets, the gap is often negative, and voucher holders can sometimes rent units above the median.

If your area has a large positive gap, ask your PHA about:

• Exception payment standards in higher-cost ZIPs
• Small Area FMRs (if applicable), these often lift PS in specific neighborhoods
• Portability to a neighboring jurisdiction where vouchers cover the market better

Related guides

• How to Apply for Section 8
• Moving With Your Voucher
• What to Expect in a Section 8 Inspection

Source: HUD USER FMR methodology (FY25), 24 CFR §982.503 (payment standards), 24 CFR §982.505 (use of payment standards). Last reviewed April 15, 2026 HUD USER FMR methodology (FY25), 24 CFR §982.503 (payment standards), 24 CFR §982.505 (use of payment standards). Last reviewed April 15, 2026

Quick reference, payment-standard mechanics

FMR / SAFMR / 50th-percentile glossary

Concept	Meaning
FMR	Fair Market Rent, HUD-published reference rent per metro area, computed annually.
SAFMR	Small Area FMR, ZIP-code-tabulation-area version, mandatory in qualifying metros.
50th Pct	Higher reference for opportunity-mobility metros (typically about 110% of standard FMR).
Exception PS	HUD-approved local override extending the upper bound to 120% of FMR with rent-reasonableness backup.

Worked example, payment-standard math

For a metropolitan area where the HUD FMR for a 2-bedroom unit is ,400, your local PHA can set the payment standard anywhere from ,260 (90% floor) to ,540 (110% ceiling), with HUD-approved exception payment standards extending to ,680 (120% with rent-reasonableness documentation). If your tenant rent share is 30% of ,200 adjusted monthly income, you contribute $360 monthly, and the PHA pays the difference between the agreed gross rent and $360, up to the locally set payment standard.

How payment standards are revised

HUD publishes new FMR tables annually in the Federal Register, computed using the American Community Survey 5-Year base trended forward via Bureau of Labor Statistics CPI inflators and Annual Adjustment Factor (AAF) modifiers. PHAs review and revise local payment standards on at least an annual cycle, often timed with the federal fiscal year (October 1).

What to do when market rent exceeds the payment standard

Payment standards are local; FMR is federal. The two intersect at the leasing table.

See related payment-standards lookup, income-limits guide, and voucher-vs-market gap analysis.