Buying on one income usually works by lowering the payment rather than raising the salary. A first-time buyer loan needs 3.5% down instead of 20% if your credit score is 580 or higher, and if the building has a second unit, the rent from it offsets your payment every month and lenders will count part of that rent toward what you qualify for.
The usual advice, save 20% and carry the whole payment on a single-family house by yourself, fits a small share of the country. On one income it is close to a pipe dream. The route that works is different: buy a house that brings in income of its own.
Can you buy a house on one income?
Yes, and the deposit is usually the barrier rather than the salary. A first-time buyer loan from the Federal Housing Administration, which everyone shortens to FHA, needs 3.5% down if your credit score is 580 or higher, and 10% between 500 and 579.[S1] On a $200,000 building that is about $7,000 at 3.5% ($20,000 at 10%) rather than $40,000. Down payment assistance from a state or county program can cover part or all of even that.
The part that changes the math: buy something with a second unit
An FHA loan works on a two-to-four-unit building much as it does on a single-family house, as long as you live in one of the units. A three- or four-unit building must also pass FHA’s self-sufficiency rent test. You take the same 3.5% deposit, live in one side, and rent the others. That does two things at once, and the second one is the part most people have never been told.
| Single-family house | Two-to-four-unit building you live in | |
|---|---|---|
| Deposit on a first-time loan | 3.5% | 3.5%, the same |
| Who pays the mortgage | You, all of it | You, less whatever the other unit brings in |
| Does the rent help you qualify? | There is no rent | Lenders count part of the expected rent toward your approval |
| Monthly cost after move-in | The full payment | The payment minus the rent you collect |
That second row is why a small multi-unit building can be easier to afford on one income than a single-family house on the same street. This is how I went from living in a van to owning a duplex, and it is the whole idea behind house hacking.
What to do first
Work out two numbers before you shop: what a lender will approve, and what you can carry each month without strain. They are rarely the same, and the gap between them is where people get into trouble on one income. Then check what assistance your state and county offer, because that is the number that usually decides whether you can start this year or in three years.
Run your own numbers: the rent versus buy versus house hack calculator compares all three on one screen, or see how buying a duplex and living in one side works step by step.
Questions people ask about buying on one income
What salary do you need to buy a house on one income?
There is no single salary threshold, because lenders judge the payment against your income rather than the price against your salary. What moves the answer most is the size of the deposit and whether the building produces rent, since both lower the payment the lender is measuring.
Can one person get approved for a duplex?
One person can be approved for a two-to-four-unit building on a first-time buyer loan, provided they live in one of the units. Lenders will typically count a portion of the expected rent from the other units toward qualifying, which can raise the price you are approved for compared with a single-family house.
Is it cheaper to buy a duplex than a house?
A duplex usually costs more to buy than a comparable single-family house, and less to live in, because the rent from the second unit lands against your payment every month. The purchase price is the wrong number to compare. Compare what you pay out of pocket each month once someone else is living in the other half.
This post is part of the full first-move on-ramp.
On one income the down payment is usually the wall. Assistance is the fastest way through it, so I checked every metro for programs that work on a two to four unit home: the survey is here.
Find out how far you actually are, and what to do first.
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Sources
- U.S. Department of Housing and Urban Development, What is the minimum down payment requirement for FHA?. The 3.5% minimum from the agency itself, and the fact that it applies to one to four unit properties.
- U.S. Department of Housing and Urban Development, Buying a Home. The official starting point for first-time buyers, including what FHA insures and who it is aimed at.
- U.S. Department of Housing and Urban Development, State Information. State and county down payment assistance, which is the lever that usually decides whether you start this year or in three years.
- Consumer Financial Protection Bureau, What is private mortgage insurance?. What the 20% figure is actually about on a conventional loan, and what it costs to put less down.
- [S1] U.S. Department of Housing and Urban Development (HUD), FHA Resource Center, checked September 2026: FHA’s minimum down payment on a one-to-four-unit home you live in is 3.5% with a credit score of 580 or higher, and 10% with a score of 500 to 579. answers.hud.gov.