Does Rental Income Count When I Buy Another House?

The short answer: yes, and not at the number on the lease. A share of gross rent — commonly around a quarter of it — is set aside for vacancy and maintenance before anything reaches your file. What is left then gets measured against that property's own mortgage payment, taxes, insurance and HOA.

Which produces the outcome nobody expects: rental income can be negative. When the property costs more to carry than the adjusted rent covers, the shortfall does not simply vanish. It becomes a monthly obligation counting against you in exactly the way a car payment does.

I'm Jeff Moran, a mortgage broker in Bluffton, South Carolina, originating since 1996. This is the single most misunderstood income type I deal with, and the misunderstanding runs in both directions — some people assume their rental helps far more than it does, and others do not realize it can be actively hurting them.

How the number actually gets built

Three steps, and the middle one is the one people skip.

1. Start with gross rent. From the lease if there is one, or from the tax return if you have owned the property long enough to have reported it.

2. Take out vacancy and maintenance. A portion comes off the top — commonly around twenty-five percent — because a rental does not produce twelve months of rent every year forever. Tenants leave, water heaters fail, and the calculation is built to expect it rather than to be surprised by it.

3. Subtract what the property costs you. The mortgage payment on that property, property taxes, insurance, HOA dues, and mortgage insurance if it carries any.

Whatever is left is your net rental income. If it is positive, it adds to your qualifying income. If it is negative, that shortfall is added to your monthly obligations and reduces the house payment your file supports.

That is the whole mechanism, and it is why debt ratio is where rental income actually lands rather than sitting somewhere separate.

Documented history versus a lease

If you have owned it and reported it, the tax return generally governs. Schedule E is where a rental lives, and an underwriter reads it much the way they read a self-employed return — depreciation typically gets added back, because it lowered taxable income without any money leaving your account.

If it is newly acquired or newly rented, there is no return yet, so a signed lease does the work — often supported by an appraiser's opinion of market rent, so the figure is not simply whatever two parties agreed to write down.

If it is not rented yet, it generally cannot be counted as income at all, whatever it could theoretically fetch. Intent is not income — and an unrented property counts fully against you in the meantime, which is why this shows up early in a real pre-approval.

The departing-residence case, which is the common one

Most people meeting this topic are not investors. They are moving, keeping the old house, and renting it out.

That case has its own treatment, and it usually requires a real signed lease rather than a plan — sometimes with evidence the tenant's deposit has actually been received. The point of the paperwork is to distinguish a rental from a hope.

It matters because the alternative is carrying both housing payments in your ratio, which is the arithmetic behind buying before you sell. Converting the old home to a documented rental is one of the recognized ways that payment stops counting fully against you.

Short-term rentals are their own conversation

Income from a nightly-rental platform is treated more conservatively than a twelve-month lease, and the treatment varies by program and by lender appetite.

The honest version: it is usually documentable once there is a real history of it on a tax return, and it is much harder to use before that history exists. In a market like the Lowcountry this comes up constantly, and it is worth asking about specifically rather than assuming a rental is a rental.

What actually goes wrong

• Assuming gross rent is the number. It is the starting point, and roughly a quarter comes off before anything else happens.
• Forgetting the property's own costs. People remember the mortgage and forget taxes, insurance and HOA, which is exactly where a positive number turns negative.
• A lease from a relative. It can be legitimate, and it invites more scrutiny, not less. Arm's-length terms and actual deposited rent matter.
• Counting a property that is vacant. Empty is not rented, and it counts fully against you while it sits.
• Buying an investment property expecting the rent to carry the qualification. Frequently it does not, particularly early on when the loan balance is at its largest.
• Not knowing where you stand before shopping. Rental math is entirely knowable in advance and almost never gets run in advance.

An illustration, so the shape is clear

Numbers below are invented to show the mechanism, not a quote.

You own a rental that brings $2,000 a month. Mentally, that is $2,000 of income helping you buy the next house.

Take out roughly a quarter for vacancy and maintenance and about $1,500 remains.

Now subtract what the property costs: say $1,150 of principal and interest, $250 of taxes, and $120 of insurance — $1,520. The property carries $20 a month more than the adjusted rent covers.

So the rental does not add $2,000 to your file. It adds nothing, and contributes a small negative that counts against you.

Run the same property with the mortgage paid down, or refinanced to a lower payment, and it swings positive and genuinely helps. Same house, same tenant, same rent — the answer is set by what the property costs to carry, not by what it earns.

What to do now

Run it before you shop, because this is arithmetic rather than judgment and it takes minutes.

Bring the lease or the Schedule E, plus the mortgage statement, tax bill and insurance for that property. It is the same arithmetic that sets the price range worth shopping, just with one more property in it. Run your scenario first — no credit pull, no account, nobody calls you — and then we can put the rental in properly instead of guessing at it.

If you are thinking about keeping a home and renting it while you buy the next one, have that conversation before you list or lease anything. The documentation that makes it count has to exist at the right time, and it is the kind of thing that is easy in week one and impossible in week six.

Nothing here is a loan approval, a denial, or a commitment to lend. Program guidelines differ and change, and what applies to a specific property is worth confirming rather than assuming.

Common questions

Does rental income count toward qualifying for a mortgage?

Generally yes, but not at the full rent. A share of gross rent — commonly around a quarter — is removed for vacancy and maintenance, and the property's own mortgage payment, taxes, insurance and HOA are then subtracted. What remains is added to your qualifying income if positive, and added to your monthly obligations if negative.

Why does my rental property hurt my mortgage application?

Because the calculation nets the adjusted rent against everything the property costs to carry. If the mortgage payment, taxes, insurance and HOA together exceed the rent after the vacancy and maintenance adjustment, the shortfall becomes a monthly obligation counting against you. That is common on recently purchased rentals, where the loan balance is at its largest.

Can I use rental income on a property I just bought?

Usually, though the documentation is different because there is no tax return yet. A signed lease generally does the work, often supported by an appraiser's opinion of market rent so the figure is not simply what the parties agreed to write down. A property that is not actually rented typically cannot be counted as income at all.

Do I need two years of rental history?

Not necessarily. Where the property has been owned and reported, the tax return governs and depreciation is typically added back. Where the rental is new, a lease and supporting market-rent evidence often substitute. The requirements vary by loan program, which makes this one worth asking about for your specific property rather than assuming a general rule.

Can I rent out my current home and buy a new one?

Frequently yes, and it is one of the recognized ways the departing home's payment stops counting fully against you. It generally requires a genuine signed lease rather than an intention, and sometimes evidence that the tenant's deposit has been received. Setting that up before you go under contract on the new house is what makes it work.

Does Airbnb or short-term rental income count?

It is treated more conservatively than a long-term lease, and the treatment varies by program and lender. It is generally usable once there is a documented history on a tax return, and considerably harder to use before that history exists. Because this comes up often in vacation markets, it is worth raising specifically rather than assuming all rental income is handled the same way.