How Conventional Loan Underwriting Counts Rent From Other Units

The Quick Read: Underwriters count rent from the other units in a two- to four-unit home you live in, but only a reduced share of it. The rent is added to your income, not subtracted from your payment. The full housing payment on the property stays in your debts. The unit you occupy does not produce countable rent, and a lease or an appraiser’s rent schedule has to support every dollar the lender uses.

Here is how that works inside a file, step by step, and where it breaks down.

What Does It Mean to Count Rent From Other Units?

Counting rent means the lender treats part of the tenants’ payments as income when it measures whether you can carry the loan. It applies to a duplex, triplex or fourplex where you live in one unit. The other units are the source of the rent.

This matters most on conventional loan programs because the agencies behind them, Fannie Mae and Freddie Mac, write the rules lenders follow. Across the wholesale programs Lendmire places files with, the same pattern shows up on nearly every small multifamily purchase: the rent helps, but it never erases the payment.

The default rule is narrow. Rent from your own principal residence generally cannot be used to qualify, per the Fannie Mae Selling Guide’s rental income section. The exceptions are boarder income, accessory units on a one-unit home, and the other units in a two- to four-unit home you occupy.

Key Terms Defined

Gross rent: The full monthly rent the tenants pay or the appraiser says the unit would bring.

Rent used for lender review: The portion of gross rent the underwriter counts toward qualifying income, which may be lower than the full amount.

Market rent: The rent an appraiser reports for a unit based on comparable rentals, shown on the appraisal’s rent schedule.

Housing payment (PITIA): Principal, interest, taxes, insurance and any association dues on the property.

Debt-to-income ratio (DTI): Your monthly debts divided by your monthly income. The automated finding governs most files, with a total ratio ceiling of 50%.

Which Rent Counts and Which Doesn’t?

Rent from units you do not live in counts. Rent from the unit you live in does not. Freddie Mac’s Seller/Servicer Guide says income is eligible from the units the borrower does not occupy on a two- to four-unit primary residence. It also allows a live-in aide or an accessory unit on a one-unit primary residence.

The occupancy decision also sets leverage. On a principal residence, two- to four-unit purchases go up to 95% LTV. If you do not live there, investment property tops out at 85% on one unit and 75% on two to four units, and that is a different loan with different math. The Fannie Mae Eligibility Matrix is the agency’s own table for these limits. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Why Do Underwriters Count Only Part of the Rent?

Vacancy and repairs are real costs, so the underwriter does not hand you full credit. Freddie Mac’s guide confirms a 75% factor on the investment-property method, with the 25% reduction covering vacancy, operating and maintenance costs, and unexpected expenses. The exact factor for the owner-occupied case can differ, so on your file the lender’s wording controls. Think of it as “a reduced portion of the rent.”

The reduction protects you too. Qualifying income is not cash flow. If a unit sits empty for two months, the budget has to absorb it.

How Is the Number Calculated, Step by Step?

The calculation has five steps, and the order matters.

1. Set occupancy. You must live in one unit of the two- to four-unit property. Rent from the others is eligible. Rent from a one-unit home generally is not.

2. Order the rent evidence. On a purchase, the appraiser completes Form 1025 at Fannie Mae, the Small Residential Income Property Appraisal Report, or Form 72 at Freddie Mac. Both report market rent for the units. Fannie Mae’s forms page lists Form 1025 and the Form 1037 Rental Income Worksheet.

3. Pick the rent figure. The lender looks at the lease and the appraiser’s market rent. The guide asks whether market rents reasonably support the lease income. When they disagree, the file stalls until the lender settles on a supportable number.

4. Reduce the rent. The lender applies the vacancy and expense reduction to get rent used for lender review.

5. Run the ratios. On a two- to four-unit primary residence, Freddie Mac’s servicing view of Section 5306.1 says the monthly housing expense is calculated without rental income. The net rent is then added to stable monthly income.

That last step is where people get confused. The rent does not shrink the payment. It grows the income side of the ratio. The full payment stays in the debts.

What Does a Worked Example Look Like?

Say a buyer purchases a fourplex, lives in one unit, and the other three have leases. Describe it without dollars:

• The three rented units produce gross rent.
• The underwriter reduces that rent by roughly a quarter, subject to the lender’s exact method.
• The reduced amount is added to the buyer’s job income.
• The full payment on the fourplex stays in housing expense.
• The ratio is measured against the 50% ceiling that automated underwriting applies on most files.

Without counted rent, the buyer’s job income alone has to carry the whole payment. With counted rent, the income side gets larger and the same payment can fit. The cost is paperwork and a larger appraisal scope.

What Documents Prove the Rent?

The lender must verify the income it relies on with reliable third-party records, not your word. The CFPB’s Ability-to-Repay and Qualified Mortgage compliance guide says a creditor cannot rely on what a consumer says about income. That is why “I’ll rent it out” does not work.

On a purchase, Freddie Mac says the lender must make reasonable efforts to find out whether a lease exists, using the appraisal, comparable rent data, the contract and a conversation with you. An existing lease has to be current and fully executed, with the seller as landlord. A handshake lease fails that test.

When the Numbers Disagree or the File Is Messy

Most rent-related delays come from a short list of problems:

• Lease and appraisal disagree. A lease far above market rent draws a question. The lender needs a number the appraiser’s schedule supports.
• A vacant unit. No lease means the appraiser’s market rent is the only evidence.
• Informal tenants. A relative paying nothing or a month-to-month arrangement with no paper gives the underwriter nothing to verify.
• Short-term rentals. Treat these cautiously. They typically need documented tax-return income before they count, and lender overlays vary.
• Non-conforming units. A unit that is not legal or not part of the appraised property can fall out of the rent schedule.

Where the General Rule Breaks: The First-Time Buyer Trap

This is the edge case that catches buyers. Under Fannie Mae’s SEL-2019-08 announcement, the amount of subject-property rent a lender can use depends on your housing history. Because this is a 2019 announcement, confirm it against the current Selling Guide with your loan officer.

• You own a home or have a current housing expense, and you have at least one year of rental income history or documented property-management experience: no restriction on the rental income that can be used.
• Same housing history, but under a year of that experience: on a principal residence, rental income up to the property’s PITIA can be added to income.
• No home owned and no housing expense: subject-property rent cannot be used at all.

A renter buying a first duplex fits that last category. Fannie Mae said the change supports sustainable ownership for buyers with no landlord track record. Freddie Mac handles this case differently, so a file one agency declines may read differently at the other. Which one applies depends on the lender’s delivery choice and the automated finding.

Related edge cases: Fannie Mae’s SEL-2023-09 announcement aligned how rentals you already own are treated when they became rentals within the last 12 months. A borrower without a primary housing expense or property-management experience may see the counted amount limited.

When Rent Doesn’t Help

A strong rent roll can still fail the file. Thin personal income, heavy existing debts or a score under the floor will sink the ratio no matter what the tenants pay. The wholesale conventional programs start at a 620 decision score, and the automated finding governs most files. Manually underwritten loans run tighter ratios of 36% or 45%.

Sometimes the better choice is to leave rent out. If your job income carries the payment alone, you skip the lease collection, the Schedule E request and the rent-supports-lease questions. Keep the rent as cash flow, not qualifying income.

Mortgage insurance also applies above 80% LTV. You can request cancellation at 80% of the original value with good payment history, and the servicer must end it at 78%. On a 95% purchase of a fourplex, that insurance is part of the housing payment the ratio has to carry. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

How Do Loan Size and Leverage Fit In?

Conforming loan limits cap the size of these loans, and limits rise with unit count. The FHFA’s conforming loan limit announcement sets the one-unit baseline and says two- to four-unit limits are higher. Check the county table in that release for your property. A loan above the limit for its unit count is a jumbo loan, which sits outside this framework.

For a cash-out refinance, conventional leverage drops to 75% LTV on two- to four-unit principal residences, versus 80% on a one-unit home. Seasoning applies: the existing first mortgage must be at least 12 months old, and you must have been on title for 6 months, with exceptions for delayed financing, inheritance and legal awards. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

Practical Next Steps

• Decide which unit you will occupy and say so up front.
• Pull current leases, and ask the seller for them before you write the offer.
• Gather your last tax return if you own rentals now, including Schedule E.
• Document any property-management experience in writing.
• Expect a rent schedule from the appraiser, which means more appraisal work than a one-unit home.

Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.

If you are buying a home and want to see whether a conventional loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Lendmire’s piece Does Rent From the Other Units Help You Qualify for a Conventional Loan? covers the same question from the borrower’s side.

For your own numbers, request a scenario review with Lendmire.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage broker licensed for consumer lending in 16 states. Lendmire arranges FHA, VA, conventional and jumbo purchase and refinance loans through wholesale lenders; every file is underwritten by the lender under the applicable program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae Selling Guide: Rental Income

2. Freddie Mac Seller/Servicer Guide, Section 5306.1

3. Fannie Mae Eligibility Matrix

4. Fannie Mae Selling & Servicing Guide Forms

5. Freddie Mac Guide 5306.1 (servicing view)

6. Ability-to-Repay and Qualified Mortgage compliance guide

7. Fannie Mae SEL-2019-08

8. SEL-2023-09 announcement

9. FHFA 2026 Conforming Loan Limits