How Does Rental Property Affect Debt-to-Income Ratio?

Rental property affects your debt-to-income ratio on whichever side of the equation the math sends it. Conventional lenders count 75% of your gross rent, subtract the property’s full monthly housing payment, and add any surplus to your qualifying income or any shortfall to your monthly debts. Loans run through Fannie Mae’s Desktop Underwriter cap total DTI at 50%, and manually underwritten loans cap at 36%, stretched to 45% with the right credit and reserves.¹ Whether your rental helps or hurts comes down to that 75% comparison and which calculation method your lender applies.

Why Lenders Count Only 75 Percent of Your Rent

Conventional lenders following Fannie Mae and Freddie Mac guidelines count only 75% of gross rental income when running your numbers.² If your tenant pays $2,000 a month, the lender treats $1,500 as reliable. The other 25% is a built-in cushion for vacancy, repairs, and the small costs that quietly erode cash flow between rent checks.

The discount applies no matter how your property has actually performed. Zero vacancy for five years does not change it. The same 75% factor sits in Fannie Mae’s Selling Guide at Section B3-3.1-08 and Freddie Mac’s Seller/Servicer Guide at Section 5306.1.³

Which Method Your Lender Uses

Two different calculations produce your qualifying rental income, and which one applies depends on whether the property already shows up on your tax returns.

Schedule E Method for Properties You Already Own

If you have owned the property long enough for it to appear on your federal returns, the lender works from IRS Form 1040, Schedule E.⁴ Schedule E shows the rent you actually collected and every expense you deducted. The lender starts with your net income or loss from that form, then adds back certain non-cash deductions to get closer to true cash flow.⁵ Mortgage interest, taxes, and insurance are also added back, because those costs will be counted again as part of the property’s PITI payment.

Lease Method for New Purchases or New Rentals

When you are buying a rental, or when the property has not yet been on a full year of tax returns, the lender uses the simpler approach. Gross monthly rent from a signed lease (or an appraiser’s market rent estimate) times 0.75.² The same method covers situations where the most recent tax return does not reflect current reality, such as a property that sat vacant during the filing year and is now fully leased. The lender will want either a comparable rent schedule or two months of bank statements showing consecutive rental deposits to confirm the lease is real.

Where the Property Lands: Income or Debt

Your DTI is total monthly debts divided by gross monthly income. Rental property joins that formula on whichever side the 75% comparison sends it.

Surplus Adds to Your Income

The underwriter multiplies gross rent by 0.75, then subtracts the full housing payment: principal, interest, taxes, insurance, and any homeowners association dues.⁶ A positive result is added to your gross monthly income.

Say you earn $8,000 a month from your job, and a rental brings in $2,400 in gross rent. The lender counts $1,800. If PITI plus dues total $1,400, the $400 surplus lifts your qualifying income to $8,400. Every debt you carry is now divided by the larger number, and your DTI comes down.

Shortfall Adds to Your Debts

Flip the numbers. If PITI plus dues were $2,100 instead of $1,400, you’d have a $300 monthly shortfall. That $300 moves to the debt side of the ratio, joining your car payment, credit card minimums, student loans, and the new mortgage you are applying for.⁷ A shortfall of a few hundred dollars can trim tens of thousands from what you qualify to borrow.

Watch the HOA Dues

If the rental sits in a community with association dues, those dues come out of the 75% rent figure along with PITI, unless they are already escrowed inside the mortgage payment.⁶ A $200 monthly HOA fee is often what turns a surplus property into a debt on your application.

Depreciation Can Rescue a Paper Loss

Depreciation is a tax deduction that shrinks your taxable rental income without touching the cash you actually receive. On Schedule E it appears on Line 18, and it often runs into the thousands of dollars a year because it spreads the building’s cost over its useful life.⁴ Without an add-back, your return can show a loss on a property that is putting money in your pocket every month.

Fannie Mae requires the lender to add depreciation back when using the Schedule E method.² If Schedule E shows a $2,000 loss but includes $5,000 of depreciation, the lender adds the $5,000 back, converting the loss into $3,000 of qualifying income. This single add-back can be the difference between a property that helps your file and one that sinks it.

The Ceilings You Have to Stay Under

The DTI math matters because there is a hard limit on the other side of it. Fannie Mae sets two tiers:¹

Loans run through Desktop Underwriter cap at 50% total DTI. Most conventional applications go through DU, so this is the ceiling most borrowers deal with.
Manually underwritten loans cap at 36%, stretched to 45% for borrowers who meet the credit score and reserve thresholds in the Eligibility Matrix.

If the rental math pushes you above 50% (DU) or 45% (manual), the loan is not eligible for delivery to Fannie Mae. That is why a property producing a shortfall can end a file, and one producing a surplus can save it.

What You’ll Need to Document

Rental income only counts if you can document it the way the lender requires. Missing paperwork means the income drops out of the calculation entirely.

For an existing rental, expect to provide two years of federal income tax returns with Schedule E attached.² Schedule E gives the underwriter a line-by-line view of what the property actually did over two full years.

For a newer arrangement, a current, fully signed lease is required, showing all party names, the term, and the monthly rent.² You will also need to prove the lease has taken effect: two consecutive months of bank statements showing rental deposits, or, for a brand-new lease, copies of the security deposit and first month’s rent with proof of deposit.

Buying a property that has never been leased? An appraiser can complete a comparable rent schedule based on similar nearby properties, and the lender applies the same 75% factor to that estimate.² This is what lets you use projected rent to qualify for the loan you are using to buy the property.

What to Do When the Rental Hurts Your DTI

A property that runs a shortfall under the 75% rule does not automatically disqualify you, but it forces you to make room somewhere else. A few moves that shift the math:

Pay down revolving balances. Eliminating a credit card minimum cuts the debt side of the ratio immediately.
Put more down on the new loan. A larger down payment shrinks the new PITI you are adding to your debts.
Refinance the rental. If rates have dropped since you financed the property, a lower PITI can flip a shortfall into a surplus.
Raise the rent if it is below market. A higher gross rent produces a higher 75% figure.
Compare methods. If Schedule E with the depreciation add-back produces stronger numbers than the lease-based 75% calculation, ask the lender to use it.

Some of these are immediate. Others need lead time, so start well before you apply.

A Note on Non-Conventional Loans

The 75% rule and the DTI framework here apply to conventional loans backed by Fannie Mae and Freddie Mac. FHA loans treat rental income differently, and for three- and four-unit properties add a self-sufficiency test that can force a smaller loan amount if projected net rent does not cover the payment. VA loans tend to use rental income only to offset the departing property’s mortgage rather than to boost qualifying income. And if the personal DTI math simply will not work, a debt service coverage ratio (DSCR) loan qualifies you on the property’s income instead of yours, at the cost of a higher rate, a larger down payment, and prepayment penalties. Those are separate products with separate rules, and worth pricing out only if the conventional path does not fit.

1
Fannie Mae. Debt-to-Income Ratios
2
Fannie Mae. Rental Income
3
Freddie Mac. Guide Section 5306.1
4
Internal Revenue Service. Instructions for Schedule E (Form 1040)
5
Fannie Mae. Income or Loss Reported on IRS Form 1040, Schedule E
6
Fannie Mae. DU Job Aids: DTI Ratio Calculation Questions
7
Fannie Mae. Monthly Debt Obligations