What is the 30% rule for rent?

The 30% rule says housing costs should not exceed 30% of gross monthly income. HUD codified this threshold in the 1969 Brooke Amendment (Public Housing Act) — anything above 30% defines a household as "cost-burdened" and above 50% as "severely cost-burdened".

Where does the 30% rule come from?

Senator Edward Brooke III pushed the 1969 amendment requiring public housing residents to pay no more than 25% of income for rent. Congress raised it to 30% in 1981 under the Reagan-era housing reauthorization, and HUD has used 30% as the affordability threshold ever since.

Why do most landlords require 40x or 3x the rent?

New York landlords typically require an annual gross income of 40 times the monthly rent (equal to a 30% rent-to-income ratio). Most US landlords use 3x monthly rent = 33% — slightly stricter than the HUD 30% benchmark to leave margin for utilities and tenant insurance.

Is the 30% rule still realistic in expensive cities?

No. Per the Joint Center for Housing Studies of Harvard 2025 State of the Nation's Housing Report, more than half of US renters spent over 30% of income on housing in 2024. In NYC, SF, Boston, LA, Miami, the median renter spends 40-50% of income.

What is the difference between gross and net income for rent calculations?

Gross income is your pre-tax pay; net is after federal, state, FICA, and benefit deductions. The 30% rule uses gross — but financial planners often recommend the 30% rule applied to NET income for a more accurate cash-flow picture, especially in high-tax states.

How does HUD define cost-burdened vs severely cost-burdened?

HUD defines cost-burdened as paying more than 30% of household income for housing and utilities; severely cost-burdened is more than 50%. These thresholds drive eligibility for the Housing Choice Voucher (Section 8) program and Low-Income Housing Tax Credit (LIHTC) units.

What is the rent-to-income ratio?

Rent-to-income ratio (RTI) = monthly rent ÷ monthly gross income, expressed as a percentage. RTI of 30% is the HUD threshold; 40% is the common landlord-screening cap; 50% is HUD's "severely burdened" line.

Should student loan or car payments change my rent budget?

Yes. The CFPB recommends a "total debt-to-income" ratio under 36% — so if you have a $400 student loan plus $300 car note, your housing budget should fall to about 25% of gross. Use our Debt-to-Income calculator for a full picture.

Does the 30% rule include utilities?

In HUD's definition, yes — utilities are included in "gross rent". Most landlord screening uses base rent only. When budgeting, add an estimated $150-250/month for electric, gas, water, internet and trash to your rent figure before comparing to 30%.

What is fair market rent (FMR)?

HUD publishes Fair Market Rents annually for every US county. FMR is set at the 40th percentile of new-tenant gross rents and used to cap Section 8 voucher payments. Search the HUD FMR database for your zip code to compare your budget against the local median.

How do I improve my rent-to-income ratio?

Three levers: raise income (side gig, promotion, second earner), reduce rent (downsize, roommate, suburb move, longer commute), or eliminate other debt (snowball method, refinance). Each $100/month of pay raise lifts the affordable-rent ceiling by $30 under the 30% rule.

What does the Brooke Amendment of 1969 require today?

Edward Brooke III's amendment requires public-housing tenants to pay the greater of 30% of adjusted income, 10% of gross income, or the welfare-rent minimum. The cap remained law through the Quality Housing and Work Responsibility Act of 1998 and subsequent reauthorizations.

HUD 30/40/50 cost-burden rule

Rent Affordability Calculator

To find an affordable rent budget, multiply your monthly gross income by 0.30. That is HUD's cost-burden ceiling set in the 1969 Brooke Amendment and used by every Housing Choice Voucher caseworker in 2026. The pie shows your rent slice; the ring ticks at 30%, 40%, 50% — the three lines most landlords, advisors, and HUD itself care about.

$1950

30% cap (HUD)

$2600

40% landlord

$3250

50% severe

27.7%

Your RTI

30% is the cap, not the goal.

Quick Conversion

FROM (Monthly gross ($))

TO (Max rent ($))1,950

ratio

Formula: rent = gross × ratio

Income Allocation Pie — 30/40/50 Tick Ring

Budget inputs

Label

Monthly gross income ($)

Current / target rent ($)

City / metro

30%

$1950

40%

$2600

50%

$3250

City affordability presets

Income → 30/40/50 rent caps

Gross/mo	30%	40%	50%
$2,500	$750	$1000	$1250
$3,500	$1050	$1400	$1750
$4,500	$1350	$1800	$2250
$5,500	$1650	$2200	$2750
$6,500	$1950	$2600	$3250
$7,500	$2250	$3000	$3750
$9,000	$2700	$3600	$4500
$10,500	$3150	$4200	$5250
$12,000	$3600	$4800	$6000
$15,000	$4500	$6000	$7500

Need debt-to-income too? See DTI Calculator →

Formula

max_rent = gross × ratio

HUD 30% cost-burden threshold (Brooke Amendment 1969); 40% common landlord cap; 50% severely cost-burdened (HUD 4350.3 REV-1).

Worked: gross = $6,500/mo → 30% rule → max rent = $1,950/mo. At a $2,600 rent the RTI is 40% — landlord-screen pass, HUD cost-burdened.

From Brooke 1969 to Zumper 2026: how the 30% rule became the rent yardstick

In 2026, a recent graduate scanning StreetEasy listings in Brooklyn needs to know in three seconds whether a $2,800 rent is reasonable for a $72,000 starting salary. The answer is "not really" — that's 47% of gross. The 30% rule, codified by Senator Edward Brooke III in 1969 and lifted to its current level by Congress in 1981, gives renters and landlords a fast common language for that judgment.

The National Association of REALTORS (NAR), founded in 1908, was the trade group that normalized 25% then 30% as the residential housing budget benchmark across mortgage and rental markets. The 30% threshold also drives the qualifying ratio used by Fannie Mae and Freddie Mac for conforming mortgages, and HUD Section 8 Housing Choice Voucher payments are pinned to it through Fair Market Rent (FMR) calculations.

The Federal Housing Administration (FHA), created by Title II of the National Housing Act of 1934, used the 25% rule originally — pushing the modern percentage-of-income framework into the mainstream. The Servicemen's Readjustment Act of 1944 (the GI Bill) extended the same philosophy to VA loans. Both FHA and VA still recommend that housing costs (PITI + HOA) stay under 28-31% of gross.

The Housing and Community Development Act of 1974 created the Section 8 voucher program, which sets tenant rent contribution at 30% of adjusted income — the strictest real-world enforcement of the Brooke Amendment threshold. As of 2026, more than 2.3 million US households receive vouchers through the program, all keyed to the 30% rule.

The Quality Housing and Work Responsibility Act of 1998 preserved Brooke at the same time as PMI cancellation rights kicked in for mortgages — a parallel reform that recognized housing-cost burdens cut across rent and ownership. The Joint Center for Housing Studies of Harvard's annual State of the Nation's Housing report has tracked cost-burden percentages since 2003 using the HUD 30/50 definitions.

By 2026, the 30% rule looks outdated in coastal metros. Zumper's Q1 2026 National Rent Report shows the median renter in NYC, SF, Boston, LA, Seattle, Miami and Denver paying well over 35% — and many over 50%. The CFPB and the Federal Reserve Bank of New York have both flagged renter cost-burden as a leading indicator of consumer-credit stress in their 2025-2026 financial health surveys.

Bloomberg-NMHC Apartment Strategies, the Joint Center for Housing Studies, and the US Census Bureau's American Community Survey all still publish their headline affordability figures using the 30/50 HUD lines from the Brooke Amendment. This calculator faithfully reproduces those bands — the same 30% that drives Section 8 voucher accounting, the 40% NYC landlord screen, and the 50% severely-cost-burdened line that triggers eligibility for LIHTC units under IRC §42.

How to use the rent affordability pie

Enter monthly gross income. Pre-tax pay from all sources. For two earners, sum both before entering.
Read the green slice. The 30% HUD ceiling is shown as the tick at the top of the ring.
Type your target rent. The slice grows; the center label turns amber, orange, then red as it crosses 30/40/50.
Compare landlord vs HUD lines. Most landlords accept up to 40%; HUD severely-cost-burdened starts at 50%.
Save and switch cities. Apply a city preset to compare your scenario against StreetEasy/Zumper Q1 2026 medians.

Rent affordability — frequently asked questions

Have more questions? Contact us

What renters and housing pros say

4.9

Based on 5,180 reviews

“I show this pie to every applicant who borderline-fails our 3x rent screen. Watching the slice flip from green to amber when they bump up the bedroom count does more than any spreadsheet. The HUD-cited 30/40/50 thresholds are spot on.”

Margarethe Wilhelmina Voss-Lindqvist

Residential leasing agent, Chicago multi-family REIT

May 18, 2026

“Brooke Amendment compliance work in 2026 — this tool lays out the 30% cap exactly as our regs require. The cost-burdened vs severely-cost-burdened color shifts match the HUD definitions I cite in every case file.”

Yusuf Olamilekan Akinwumi-Bankole

HUD Section 8 voucher caseworker, county housing authority

April 22, 2026

“I run new-grad clients through this with their first job offer. The 40% NYC landlord screen vs the 30% HUD rule is a huge gotcha and the pie chart makes it click instantly. Way better than a textbook ratio.”

Saoirse Cathleen O'Brien-Murphy

Personal finance coach, recent grad transition

March 28, 2026

“Austin and Miami presets are accurate per Zumper Q1 2026 data — confirmed against our own portfolio rent-rolls. The 30% rule shown here is what NMHC uses for affordability scoring. Excellent quick-look tool.”

Khathutshelo Rofhiwa Mphephu-Ramavhoya

Real-estate analyst, Sun Belt rental REIT

February 14, 2026

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