Rental Income to Qualify for a Mortgage: 75% Rule, Leases and Existing Rentals

Rental income isn't simply rent minus the mortgage payment

When you already own investment property, the lender has to convert the rental activity into a qualifying income or loss for the new mortgage. The calculation depends on how long the property has been in service, what documentation is available, whether tax returns already report the property, your property management history, and the full PITIA of the rental property.

The result can either help your DTI or hurt it. The gross rent shown on a lease isn't automatically the amount added to qualifying income.

Established rentals usually point back to the tax returns

For properties already reported on the borrower’s tax returns, the lender generally evaluates the rental income using the applicable tax return analysis rather than simply taking the current lease amount at face value. Fannie Mae provides rental income worksheets and its Income Calculator to support this analysis.

Tax returns can capture expenses, depreciation and the historical operation of the property in a way that a single month of rent can't.

A lease can be used in specific situations, not whenever it produces a better number

Fannie Mae permits lease agreements for rental income qualification in certain situations, including when a rental property was purchased after the last tax filing, when the property was placed in service during the current calendar year, when major rental interruptions distorted the tax return history, or when the lender documents another justified reason.

The policy isn't designed to let a borrower ignore a weak tax return history just because a new lease is higher.

Newly executed leases now require evidence that the lease is real

Under Fannie Mae’s September 2026 rental income guidance, when a lease is used for a property not reported on the most recent tax return, the lender generally has to confirm that the lease terms have actually gone into effect.

Depending on the circumstances, that can include recent bank statements or electronic transfers showing rent, evidence of the security deposit and first month’s rent, or a qualifying property management agreement with proof of payments.

The agreement also can't be with a family member or interested party in the scenarios covered by the rule.

Property management experience changes how positive rental income can be used

Fannie Mae now requires at least 12 months of documented property management experience before positive rental income can generally be added to qualifying income. When you have less than 12 months of experience, qualifying rental income may be limited to offsetting the property’s PITIA rather than creating additional positive monthly income.

That is a major distinction for new investors who expect a newly acquired rental property to increase their income immediately.

Example: experienced investor versus new investor

Assume an investment property produces $3,500 of qualifying net rental income before PITIA and has $2,900 of PITIA, leaving a positive $600 result under the applicable calculation.

A borrower with sufficient documented property management history may be able to use positive rental income under the program rules. A borrower without the required history may be limited to using the rental income to offset the $2,900 PITIA, meaning the same property doesn't necessarily add $600 to you’s qualifying income.

Negative rental income always matters

When the qualifying rental calculation produces a loss, the lender includes that loss in the borrower’s monthly obligations. A property that looks profitable based on gross rent can still create a qualifying loss after the program’s expense treatment and PITIA are considered.

This is why a borrower with several properties shouldn't estimate qualification by adding all gross rents together.

Multiple rentals are calculated separately and then aggregated

Fannie Mae requires rental income or loss for non subject properties to be calculated separately by property and then aggregated. One strong rental can offset another property’s loss in the total analysis, but the underwriting work still happens property by property.

That becomes especially important for investors with several financed properties because reserve requirements and multiple financed property rules can apply in addition to the rental income calculation.

A property purchased within 45 days of the new mortgage application is a special case

Fannie Mae has a separate 2026 rule for investment properties purchased within 45 days of the subject property application. In that situation, lease agreements aren't permitted to establish the qualifying rent. The lender uses market rent documentation such as an appraisal, Form 1007 or, in certain multi unit cases, market analysis tools with rental comparables.

The resulting adjusted net rental income is based on 75% of documented market rent minus PITIA, with positive income generally limited to offsetting PITIA in that specific recent purchase scenario.

What borrowers should gather before the preapproval

• Most recent personal tax returns with Schedule E for individually owned rentals.
• Business returns and Form 8825 when rental property is held in an applicable partnership or S corporation.
• Current mortgage statements, tax bills, insurance and HOA information so PITIA is accurate.
• Current leases when the program permits or requires them.
• Proof of rent receipt when a lease based calculation requires it.
• Documentation showing how long you have managed rental property.
• A complete list of financed properties so reserve and multiple property rules can be modeled.

Conventional Rental Income Rules

The 75% rule

See projected rent vs Schedule E for how the two methods compare.

Lenders typically count 75% of the gross rent. The other 25% is an allowance for vacancy and maintenance. If a property rents for $2,400 a month, $1,800 counts toward your income, and the full mortgage payment counts as a debt.

On a new purchase

For a property you're buying, lenders use either a current lease or the appraiser's estimate of market rent. That estimate comes from a rent schedule the appraiser completes with the appraisal, for single unit and multi unit properties. If the rent estimate comes in low, it can affect approval as much as a low value.

On properties you already own

Full walkthrough with the math: Schedule E explained.

Lenders usually use your tax returns, specifically Schedule E. They start with your net rental income and add back depreciation, and sometimes other non cash or one time expenses, then average it. This is why a property that cash flows well can still show weak income on paper.

Landlord history

If you've never been a landlord, lenders may limit how rental income from a new purchase is used. A history of managing rentals, or owning your home for a period, generally makes it easier. Ask before you assume the rent will carry the payment.

Turning your current home into a rental

A signed lease and proof of the security deposit or first month's rent usually lets 75% of the new rent count. See turning your home into a rental.

Short term rental income

Projected Airbnb income generally isn't used on a conventional purchase. Documented short term rental income on your tax returns may count on properties you already own. For new vacation rental purchases, DSCR is usually the tool. See conventional for vacation rentals.

My experience with Schedule E

I see this all the time with investors, and I've lived it. Depreciation makes your taxes look great and your rental income look thin. The add back helps a lot. If it's still not enough, that's when we look at DSCR for the next deal.

The depreciation add back

Tony's Schedule E showed only $3,000 of net rental income on his duplex for the year. After adding back $11,000 of depreciation, the lender used $14,000, enough to qualify for his next purchase.

Bottom line

Existing rental property can help you qualify for another mortgage, but only after underwriting converts the rental activity into a program defined net number. Tax return history, lease eligibility, property management experience and PITIA can all change the result. Investors should have every property modeled before deciding how much new debt they can safely take on.