How Much Rent a Conventional Loan Counts for a House Hacker

The Quick Read: Only part of the rent from the other units gets counted, and only on a two- to four-unit home where you live in one unit. The lender adds roughly three-quarters of that rent to your income. Your full housing payment still sits in your monthly debts, so the rent does not cancel it out. A first-time landlord faces an extra cap on how much rent counts.

What “Counting the Rent” Actually Means

Counting the rent means the lender adds a share of the other units’ rent to your qualifying income. That lowers your debt-to-income ratio, which is your monthly debts divided by your monthly income. It is a paperwork number, not the cash that lands in your account.

Here is the part that trips people up. The rent does not get subtracted from your mortgage payment. The rent goes on the income side, and the full payment stays on the debt side. A $0 net housing cost on paper does not exist in this math.

Across the wholesale programs we place files with, this is one of the most misunderstood rules. Buyers hear “the tenants pay the mortgage” and assume the lender thinks so too. The lender runs a more conservative version.

Lendmire brokers these loans through its conventional loan programs, and the house-hack question comes up often. The answer depends on the structure of the building, your landlord history, and your ratios.

Which Buildings and Which Rent Qualify

The building must have two to four units, and you must live in one of them as your principal residence. The rent from the units you do not occupy is the rent that can count. The unit you live in produces no countable rent.

On the default rule, Fannie Mae’s Selling Guide says rent from your own principal residence generally cannot be used to qualify. That covers a one-unit home. The same section carves out exceptions for boarder income and for homes with an accessory unit, and we cover both below.

Freddie Mac’s rule has a prerequisite worth knowing. Under Section 5306.1 of its Guide, a borrower generally needs to own a primary residence now or have a documented rental housing payment to use rental income. A buyer who lives rent-free with family may hit this wall. Ask about it before you write an offer.

Leverage is the other piece. The Fannie Mae Eligibility Matrix lists 95% loan-to-value (LTV) for a purchase of a two- to four-unit principal residence. LTV is the loan amount as a percentage of the home’s value. A 95% LTV means a 5% down payment. The one-unit 97% option for first-time buyers does not extend to multi-unit homes.

How the Loan Is Underwritten, Step by Step

Think of it as six steps. Each one can change the number.

1. The property is confirmed. It has two to four units, and you will occupy one.

2. Your landlord history is checked. This sets the cap, and we explain it below.

3. The appraiser reports the rent. A multi-unit appraisal includes a rent schedule showing what each unit should earn at market. Fannie Mae uses its small residential income property form for this. Freddie Mac uses its own equivalent.

4. The lender gathers documents. That means signed leases if tenants are in place, the appraisal, and traditional personal-income documentation showing rental activity if you already own the building.

5. The lender picks the rent figure. Lenders generally use the lower of the lease rent and the appraiser’s market rent.

6. The math runs. The counted rent goes into income. The full housing payment goes into debts. The automated underwriting system then returns a finding.

On Fannie Mae loans, the counted rent is roughly three-quarters of the gross monthly rent. The rest covers vacancy, repairs and management. You will see this in the lender’s rental worksheet, which the Selling Guide section above points to. The units’ rents are combined, so up to three rentable units can feed the figure.

Freddie Mac’s version differs. It works from net rental income and calculates the housing expense without the rent. The result is similar in spirit and different in the details. Your loan officer will know which one applies to the loan being delivered.

Even if you never use the rent to qualify, the appraisal still reports it on a two- to four-unit principal residence. Do not be surprised when the rent schedule appears.

The Landlord-History Cap

This is where the general rule bends. Landlord history means a year or more of documented rental experience or property-management experience.

With that history, the counted rent has no special cap beyond the standard calculation. Without it, Fannie Mae’s training material says the rent used cannot exceed the housing payment on the property. You can offset the payment, but you cannot use rent to push your income higher than that payment.

Here is what that looks like with no dollar signs. Say the other units bring in four equal rent payments each month. A buyer with landlord history has about three of those added to income. A first-time landlord also starts at about three, but the amount is then limited by the size of the housing payment. If three rents exceed the payment, the extra does not help.

A first-time landlord is not shut out. The rent still helps. It just stops helping at a ceiling.

Consider a buyer whose ratio sits just over the limit once the full payment is counted and no rent is considered. Adding the rent could move that buyer comfortably under it. A buyer already near the ceiling with a first-time-landlord cap might get less help than expected. Fannie Mae’s own training example shows a borrower moving from ineligible to eligible once the rent counts.

Who Am I? A Quick Decision Table

Treat the table as a map. Agency rules set the floor, and a lender can add stricter rules on top, called overlays. Ask each lender what it adds.

Where the Rule Breaks: Edge Cases

An accessory dwelling unit (ADU) on a one-unit home. An ADU is a small second dwelling on the same lot, such as a basement apartment or a backyard cottage. Under Fannie Mae Announcement SEL-2025-08, rent from one ADU can count on a one-unit principal residence. It applies to a purchase or a limited cash-out refinance. The ADU rent is also capped at a set share of your total qualifying income. Freddie Mac allows ADU rent on a one-unit primary residence too.

ADU income does not work on a two- to four-unit property. Do not count your duplex’s second unit as an ADU. A building with one main dwelling plus an ADU is classified as one unit.

Boarder income. A boarder is someone who rents a room in your home and shares your living space. Fannie Mae’s HomeReady program allows boarder income, again up to a capped share of qualifying income. It requires a history of shared residency and documented payments over most of the prior year. HomeReady also carries an income limit of 80% of area median income. Outside that program, boarder income generally does not count.

A roommate in a one-unit house. The default rule applies. The rent usually does not count, except as HomeReady boarder income.

Short-term rentals. Do not assume short-term income will qualify on an owner-occupied two- to four-unit property. Treat it as a question for the lender, not a plan.

A vacant unit at closing. The appraiser’s market rent steps in, since there is no lease. Expect the lender to ask for proof of how the unit will be handled.

Moving out of your current home. If you leave a current multi-unit residence and rent it, lenders typically count a share of the signed lease. Some then subtract the old payment. Without landlord experience, only the actual payment can be offset, and any shortfall is treated as a debt. Overlays vary here.

What Does Not Count

Rent from the unit you live in does not count. A projected rent that exists only in your head does not count. Rent you hope to earn after renovating does not count until it shows up in the appraisal or a signed lease.

Counted rent is also not your real cash flow. The reduction exists because vacancies, repairs and turnover are real. Plan your monthly budget on what you expect to collect after those costs, not on the counted figure. A unit that sits empty still leaves the full payment due.

Documents to Have Ready

Gather these before you talk to a lender:

• Signed, current leases for any occupied unit.
• traditional personal-income documentation showing rental activity, if you already own and rent the property. Tax treatment can depend on your situation; borrowers should speak with a qualified tax professional before relying on any deduction or credit.
• Proof of your current housing situation, whether a mortgage statement or a lease of your own.
• Evidence of landlord or management experience, if you have it.
• Your usual file: pay records, bank statements and ID.

The lender must also make reasonable efforts to learn whether a lease exists. That includes reviewing the appraisal, the comparable rent data and the purchase contract. Hand over leases early rather than waiting to be asked.

The Ratios, Credit and Mortgage Insurance Around It

The rent only helps if the rest of the file holds. Across the wholesale conventional programs we place files with, the starting decision score is 620. Some adjustable-rate loans under manual underwriting start at 640. The automated finding governs most files, with a total ratio ceiling of 50%. Manually underwritten loans use 36% or 45%, depending on reserves and score factors in the Eligibility Matrix. Each figure is subject to lender guidelines and full file review.

At 95% LTV, mortgage insurance applies because the loan sits above 80% of the value. You can request cancellation at 80% of the original value with good payment history, no second liens and no drop in value. The servicer must end it automatically at 78%. Reserve requirements for multi-unit homes are set by the Eligibility Matrix and the automated finding, so ask your loan officer for the exact number on your file. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

If you want a second angle on how rent affects approval, Lendmire’s piece Does Rent Help a House Hacker Qualify for a Conventional Loan? covers the same decision from the qualifying side.

What Your Decision Looks Like in Practice

Start with three questions. Do you have a year of landlord or management history? Do you own or rent a home today? Is your ratio comfortable without the rent?

If the answer to the last question is yes, the rent is a cushion, and you can treat the property as a normal purchase with a bonus. If the answer is no, the rent is carrying the file, and the landlord cap matters a lot.

Buyers who land in the tight middle have options. A larger down payment lowers the payment and can lower the mortgage insurance burden. A co-borrower with income changes the ratio. Paying off a debt shrinks the debt side. A different building with a smaller payment may fit better. This is a genuine toss-up for many buyers: the bigger building gives more rent, but the smaller one gives a lower payment to cover.

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.

Key Terms Defined

Qualifying rental income: the share of rent a lender adds to your income when judging whether you can afford the loan.

Debt-to-income ratio (DTI): your monthly debts divided by your monthly income, shown as a percentage.

PITIA: the full monthly housing payment, covering principal, interest, taxes, insurance and any association dues.

Landlord history: a year or more of documented rental or property-management experience.

ADU: an accessory dwelling unit, a small second home on the same lot as a one-unit house.

Boarder income: rent from someone who rents a room and shares your living space.

Overlay: a lender rule stricter than the agency’s.

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

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage brokerage serving homeowners and home buyers in 16 states. FHA, VA, conventional and jumbo purchase and refinance loans are arranged through wholesale lending channels; Lendmire brokers the financing and the lender underwrites each application. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae Selling Guide B3-3.1-08, Rental Income

2. Freddie Mac Guide Section 5306.1

3. Fannie Mae Eligibility Matrix

4. Fannie Mae ADU Income and HomeReady Boarder Income training

5. Fannie Mae Announcement SEL-2025-08