Rent-to-Income Calculator: Your Rent Burden & 30% Rule

What does a 30.00% rent burden mean?

It means that $1,800.00 of every $6,000.00 you earn before tax goes to the landlord, and $4,200.00 is left for everything else — food, transport, utilities, debt payments, saving and the rest of life. At exactly 30.00% the rent sits on the line itself: not over it, not under it. One dollar more of rent, or one dollar less of income, and the burden tips past the line; one dollar the other way and it sits inside it. That is why the line matters less as a verdict and more as a measuring stick — the burden tells you how much of the month the rent owns, and the affordable-rent figures tell you what the rent would have to be for the burden to sit where you want it.

Three things to check before you trust the number

Gross income for the application, net income for your own budget. Landlords approve on gross income — most want gross monthly income at least 2.5 to 3 times the rent, or annual income 40 times the rent — and the 30% rule is defined on gross income too. But you live on net income, after tax and withholding: on $6,000.00 gross, take-home is roughly $4,680.00, and $1,800.00 of rent is about 38% of that, not 30%. The honest check is both numbers — the gross burden for the application, the net burden for the budget — and the lower of the two affordable rents is the one to shop with. This calculator works on gross income, because that is how the rule is defined; run the same rent against your take-home pay by typing the net figure into the income field and the burden you get is the budget version.

The 30% line is a ceiling, not a target. At 25% the same $6,000.00 affords $1,500.00, and the $300.00 a month gap between the 25% rent and the 30% rent is the savings room, the debt payment or the emergency fund. At 40% the same income affords $2,400.00 — but the burden is cost-burdened by HUD's definition, and the $3,600.00 left after rent has to cover everything else. In expensive cities many renters sit at 35% to 40% and make it work by cutting elsewhere; the rule does not forbid that, it prices it. The question is never whether you can sign at 40% — landlords will approve at 40% in many markets — it is what the other 60% has to cover.

Rent alone is not the housing cost. HUD's burden definition counts housing costs including utilities, and a lease that bundles utilities is a different deal from one that does not. If utilities run $200.00 a month on top of $1,800.00, the housing burden is $2,000.00 of $6,000.00, which is 33.33%, not 30.00% — past the line on the same apartment. Trim the rent target by the utility bill before you compare listings: the affordable rent at 30% is $1,800.00 before utilities, so with $200.00 of utilities the rent to shop for is $1,600.00. Debt payments cut the other way too — a $600.00 loan payment is $600.00 less rent budget, whatever the burden percentage says.

Worked example

On the defaults: $1,800 rent, $6,000 a month gross income, 30% target.

1. The rent burden: $1,800 ÷ $6,000 × 100 is 30.00%.
2. The affordable rent at 30%: $6,000 × 30% is $1,800.00.
3. The affordable rent at 25%: $6,000 × 25% is $1,500.00.
4. The income needed at 30%: $1,800 ÷ 30% × 100 is $6,000.00.
5. The income needed at 25%: $1,800 ÷ 25% × 100 is $7,200.00.
6. The money left after rent: $6,000 − $1,800 is $4,200.00.

And the other way: the rent for a 25% burden on $6,000.00 is $1,500.00 a month, the income needed for a 30% burden on $1,800.00 of rent is $6,000.00 a month, and the income needed for a 25% burden is $7,200.00 a month.

Every branch, checked

• $1,500 rent instead of $1,800: $1,500 rent instead of $1,800: Rent burden 25.00% ($1,500.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $5,000.00.
• $2,400 rent instead of $1,800: $2,400 rent instead of $1,800: Rent burden 40.00% ($2,400.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $8,000.00.
• $5,000 a month income instead of $6,000: $5,000 a month income instead of $6,000: Rent burden 36.00% ($1,800.00 of $5,000.00). Affordable rent at 30% is $1,500.00; at 25% is $1,250.00; income needed at 30% is $6,000.00.
• $8,000 a month income instead of $6,000: $8,000 a month income instead of $6,000: Rent burden 22.50% ($1,800.00 of $8,000.00). Affordable rent at 30% is $2,400.00; at 25% is $2,000.00; income needed at 30% is $6,000.00.
• 25% target instead of 30%: 25% target instead of 30%: Rent burden 30.00% ($1,800.00 of $6,000.00). Affordable rent at 25% is $1,500.00; at 25% is $1,500.00; income needed at 25% is $7,200.00.
• 40% target instead of 30%: 40% target instead of 30%: Rent burden 30.00% ($1,800.00 of $6,000.00). Affordable rent at 40% is $2,400.00; at 25% is $1,500.00; income needed at 40% is $4,500.00.
• $2,000 rent on $7,500 a month income: $2,000 rent on $7,500 a month income: Rent burden 26.67% ($2,000.00 of $7,500.00). Affordable rent at 30% is $2,250.00; at 25% is $1,875.00; income needed at 30% is $6,666.67.
• $1,200 rent instead of $1,800: $1,200 rent instead of $1,800: Rent burden 20.00% ($1,200.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $4,000.00.

The reverses, worked backwards

• Rent for a 25% rent burden: $1,500.00 a month — at $1,500.00 a month the figures are Rent burden 25.00% ($1,500.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $5,000.00.; at the lower neighbor the figures are Rent burden 24.98% ($1,499.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $4,996.67.; at the upper neighbor the figures are Rent burden 25.02% ($1,501.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $5,003.33. — verdict: STEP.
• Income needed for a 30% rent burden: $6,000.00 a month — at $6,000.00 a month the figures are Rent burden 30.00% ($1,800.00 of $6,000.00). Affordable rent at 30% is $1,800.00; at 25% is $1,500.00; income needed at 30% is $6,000.00.; at the lower neighbor the figures are Rent burden 30.05% ($1,800.00 of $5,990.00). Affordable rent at 30% is $1,797.00; at 25% is $1,497.50; income needed at 30% is $6,000.00.; at the upper neighbor the figures are Rent burden 29.95% ($1,800.00 of $6,010.00). Affordable rent at 30% is $1,803.00; at 25% is $1,502.50; income needed at 30% is $6,000.00. — verdict: STEP.
• Income needed for a 25% rent burden: $7,200.00 a month — at $7,200.00 a month the figures are Rent burden 25.00% ($1,800.00 of $7,200.00). Affordable rent at 30% is $2,160.00; at 25% is $1,800.00; income needed at 30% is $6,000.00.; at the lower neighbor the figures are Rent burden 25.03% ($1,800.00 of $7,190.00). Affordable rent at 30% is $2,157.00; at 25% is $1,797.50; income needed at 30% is $6,000.00.; at the upper neighbor the figures are Rent burden 24.97% ($1,800.00 of $7,210.00). Affordable rent at 30% is $2,163.00; at 25% is $1,802.50; income needed at 30% is $6,000.00. — verdict: STEP.

What the defaults assume

The defaults are $1,800 a month of rent, $6,000 a month of gross income and a 30% target. Gross means before tax and benefit withholding — the income landlords verify and the income the 30% rule is defined on, not take-home pay. The rent is the rent alone, before utilities, unless the lease bundles them — HUD's burden definition counts utilities inside housing costs, so add them to the rent before judging the burden if they are billed separately. The target percentage is the burden you are testing against: 30% is the HUD line, 25% is the common comfort target, and the calculator accepts any target from just above 0% to 100%. The income reverses are checked at $10 either side, because a $1 change in a $6,000 income moves the burden by only about 0.005 points, which rounds away, while $10 moves it by about 0.05 points and shows the step cleanly. The rent reverse is checked at $1 either side, because a $1 change in rent moves the burden by about 0.02 points. The model does not count debt payments, utilities, renter's insurance or the landlord's 2.5x to 3x income screen — all of which sit alongside the burden in a real application — and it does not judge whether the money left after rent is enough to live on, which is a budget question, not a ratio.

These notes repeat in every explainer section because this page is built to be read start to finish: gross income for the application, net income for your own budget; the 30% line is a ceiling, not a target; and rent alone is not the housing cost.

Output · formula · meaning

Who uses this

• A renter checking a listing — $1,800.00 on $6,000.00 is 30.00%: on the line, and the listing either fits or it does not, before the application fee.
• A renter setting a search ceiling — at 25% the ceiling is $1,500.00, at 30% it is $1,800.00: two numbers to filter listings by, not one vague budget.
• A job changer pricing a move — the income needed for a 30% burden on $1,800.00 of rent is $6,000.00 a month: the salary the new city has to pay for the same apartment.
• A student learning housing math — one worked example from rent and income to burden to affordable rent to income needed, and the branches that show how rent, income and target each move the answer.

Accuracy & limitations

Figures are the model's own ratios on the numbers you type, computed from unrounded values: the burden is the rent divided by gross monthly income times 100, the affordable rent at any target is the income times that target, the income needed at any target is the rent divided by that target times 100, and the money left after rent is the income minus the rent. The displayed figures are rounded to 2dp. The bands follow HUD: at or under 30% within the rule, over 30% to 50% cost-burdened, over 50% severely cost-burdened — a federal guideline from 1981 housing policy, not a law about what any individual renter may pay. The model works on gross income, because that is how the rule and the landlord screens are defined; the net-income burden will be higher, and the page says so. It does not count utilities unless you add them to the rent, debt payments, renter's insurance, deposits or the landlord's income multiple, and it does not check credit, rental history or local rent levels. This page is a calculation tool, not financial advice, and not a rental approval.

Cite this calculator

On $1,800 a month of rent and $6,000 a month of gross income, the rent burden is 30.00% — exactly at the 30% line; the affordable rent at 25% is $1,500 and the income needed at 30% is $6,000. Bands: HUD cost-burdened above 30%, severely cost-burdened above 50%. Source: Bright Side Kit, brightoolbox.com.

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