The rent on the house you are buying can help you qualify for the loan to buy it. It just counts for less than you would guess, and for some buyers it counts for nothing at all.
Fannie Mae’s rules are the ones most conventional lenders follow, and they are published, so you can check your loan officer’s math before you apply.
How much of the rent does a lender count?
Fannie Mae’s selling guide says to multiply monthly gross rent by 75% to get net rental income. The missing 25 percent stands in for vacancy and running costs. It is a flat figure, the same in every county, whatever your actual taxes and insurance turn out to be.
That 75 percent is not the answer on its own. The guide then subtracts the housing payment on that same property: Net Rental Income minus PITIA equals ANRI, the adjusted net rental income. PITIA is principal, interest, taxes, insurance and association dues.
Whatever is left is what the lender adds to your income when it works out your debt-to-income ratio.
What does that look like on a real house?
Take a $250,000 house renting for $2,750 a month, bought with 20 percent down on a 30-year loan at 7 percent, with $3,000 a year in property taxes and $1,400 in insurance. There are no association dues.
| A month | |
|---|---|
| Market rent on the appraiser’s Form 1007 | $2,750 |
| The 25% the guide holds back | −$687 |
| Mortgage payment (principal and interest) | −$1,331 |
| Property taxes | −$250 |
| Insurance | −$117 |
| What the lender adds to your income | $365 |
These are example figures, not a quote.
So a house renting for $2,750 improves your application by $365 a month. If you were hoping the rent would cover the whole payment on paper, it does not. It covers the payment and $365.
Where does the rent figure come from?
Not from you, and not from the listing. The guide asks for an appraiser’s estimate of market rent: Form 1007, the single-family comparable rent schedule, or Form 1025 for a two to four unit property. If a lease is already in place and transfers with the sale, the lender wants a copy of it too.
When the appraiser’s number and the signed lease disagree, expect the lender to work from the lower one. That matters if you bought on the strength of a rent the last owner never charged.
Do you need to have been a landlord already?
This is the part that surprises first-time buyers. Fannie Mae allows positive rental income toward qualifying only when a borrower has at least 12 months of property management experience, documented through tax returns showing a full year of fair rental days.
Without that history, the guide says the lender “may only use qualifying rental income to offset the PITIA”. The rent can cancel out the new housing payment, so the loan does not count against your debt-to-income ratio. It cannot push your income up beyond that.
The practical version: on a first rental, the best the rent can do for you is make the new mortgage disappear from the ratio. On your second, the same rent starts adding income.
Rental income also has to look durable. The guide treats it as acceptable “if it can be established that the income is likely to continue”, so a month-to-month arrangement with a relative is a harder sell than a signed lease with a tenant in place.
How does the lender’s number compare with the real one?
The 75 percent rule is a blunt instrument, and it lands close to reality on this house without matching it.
| The lender’s math | The calculator’s math | |
|---|---|---|
| Rent counted | $2,063 (75% of $2,750) | $2,613 (rent less 5% for empty months) |
| Costs subtracted | Payment, taxes, insurance | Payment, taxes, insurance, repairs, reserve, management |
| Left each month | $365 | $420 |
The lender ends up $55 a month more cautious than a full breakdown that sets aside 5 percent of rent for repairs, 5 percent for big replacements and 8 percent for a manager. That is a coincidence of this house, not a rule. Put the same 25 percent haircut on a property with high taxes and a costly insurance quote and the lender’s figure will be the optimistic one.
Two things the 75 percent never covers, whatever the property: the money you set aside for a roof or a furnace, and the cost of a manager if you are not self-managing. How much to set aside for repairs and replacements works through what those come to.
So do not read an approval as a verdict on the deal. The lender is checking whether you can carry the loan. Whether the house pays you is a different question, and how to calculate cash flow on a rental property is where to answer it.
What should you do before you apply?
Ask your loan officer three things, in this order:
- Which rent figure are you using, and from where? The Form 1007 estimate, the lease, or the lower of the two.
- Do I qualify for positive rental income, or offset only? This turns on your 12 months of history, and it changes how much house you can buy.
- What is the PITIA you are subtracting? Taxes often reset on sale, so a quote built on the seller’s old tax bill will be wrong in your favor until it is not.
Tax questions about how rental income is reported belong with a tax professional, not a loan officer.
Then run the property itself on real costs in the rental calculator and see what it leaves after every bill, not just the four the lender counts.