How a Conventional Loan Counts Reserves on a 2-4 Unit

The Quick Read: Reserves are the cash and eligible assets you still hold after closing, measured in months of your full housing payment. On a two- to four-unit home you live in, Fannie Mae’s automated underwriting generally calls for six months. A one-unit home you live in has no minimum. The exact number comes from the automated underwriting findings, so treat six months as the planning figure, not a promise.

What Does “Counting Reserves” Actually Mean?

Reserves are the money left in your accounts after you have paid the down payment and closing costs. They are not a fee, and they are not a deposit. The money stays yours, in your own accounts, and the lender verifies it exists.

The yardstick is months, not dollars. Fannie Mae’s guide, as archived in an earlier version, measures reserves in months of the subject mortgage’s payment. That payment is PITIA: principal, interest, taxes, insurance, and association dues. Six months of reserves means six times that full payment, not six times the principal and interest.

Why does a lender care? A duplex or fourplex has more moving parts than a single-family home. A vacant unit or a big repair hits your budget harder. Reserves are the lender’s proof that you can absorb a bad stretch without missing a payment.

How the Count Works, Step by Step

The count is a short sequence. Across the wholesale programs Lendmire places conventional files with, it runs the same way each time.

1. The file goes through automated underwriting. Fannie Mae uses Desktop Underwriter. Freddie Mac uses Loan Product Advisor. The findings state the reserves to verify.

2. The lender builds the full payment. That means principal and interest, hazard insurance, real estate taxes, and any mortgage insurance, HOA dues, or secondary-financing payments that apply.

3. The lender multiplies by the required months. For a two- to four-unit principal residence under Fannie Mae, the Selling Guide’s minimum reserve topic sets six months for automated underwriting.

4. Cash to close comes out first. Your down payment and closing costs are verified and set aside. Only what remains counts as reserves.

5. The lender checks what is left. If the remaining eligible assets cover the required months, the reserve test is met.

The sequence matters because buyers often count the same dollar twice. A balance used for the down payment cannot also be a reserve. Plan for down payment, closing costs, and reserves as three separate piles.

How Much Do Reserves Depend on Unit Count and Occupancy?

For a home you live in, unit count is the biggest driver. A one-unit principal residence has no Fannie Mae minimum. A two-, three-, or four-unit principal residence runs to six months under automated underwriting. Duplex, triplex, and fourplex are treated alike on this point.

Occupancy changes the leverage too. Under the programs Lendmire works with, a two- to four-unit principal residence can go to 95% LTV (LTV is loan-to-value, the loan as a percentage of the home’s value). A one-unit principal residence can reach 97% for a first-time buyer. So a 2-4 unit buyer is putting down more and holding more. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

Two other notes on that automated system. It can ask for more than the baseline based on its overall risk read of your file. And a lender can add its own overlay on top of the agency rule. The finding on your file, not a chart, is the final word.

Where Do Fannie Mae and Freddie Mac Differ?

Both agencies tie reserves to the full housing payment, and both lean on their automated system. Freddie Mac’s guide defines reserves as your assets remaining after closing. For loans run through Loan Product Advisor, the lender verifies whatever reserves the Feedback Certificate states. It also requires the principal and interest portion to be based at least on the note rate.

The practical difference shows up in manual underwriting. A loan that cannot get an automated approval is reviewed by hand. Then the agency’s eligibility chart sets the months. Fannie Mae publishes that chart as its Eligibility Matrix, which lists credit score, reserves, and maximum debt-to-income for manually underwritten loans. Manual files usually carry stricter credit and ratio factors. In the programs Lendmire places, manual ratios sit at 36% or 45% rather than the 50% automated ceiling.

Many buyers on the border of the automated approval are better off asking the loan officer which engine the file will run through, and why.

What Counts as a Reserve, and What Doesn’t?

Reserves must be your verified assets or funds from an acceptable source. Cash in checking and savings is the simplest. Several other accounts count too, and some of them never have to be sold.

Per Fannie Mae’s selling FAQ on retirement and investment assets:

• Retirement accounts. Vested IRA, SEP, Keogh, and 401(k) funds can count toward down payment, closing costs, and reserves. The lender confirms you own the account, that it is vested, and that it allows withdrawals regardless of employment status. Funds used for reserves do not have to be withdrawn.
• Stocks, bonds, and mutual funds. Vested assets count if their value can be verified. For reserves, 100% of the verified value may be considered, and you do not need to sell them.
• Gift funds. The archived guide text allows eligible gift funds, but not gifts of equity, to meet reserve requirements. Confirm the current rule with your loan officer, because that text is older.

What does not count: money already spent on the down payment or closing costs, and funds with no verifiable source. A large unexplained deposit is the classic snag. Expect the lender to ask where it came from.

Keeping retirement money invested has a real benefit. You avoid the taxes and penalties that a withdrawal can trigger.

Do the Other Units’ Rent Checks Lower the Reserve Requirement?

Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

No. Rent does not shrink the reserve months. This is the most common misread on a 2-4 unit purchase.

Rent plays a separate role in qualifying income, and that role has limits. Under Fannie Mae’s rental income rules, income from the unit you occupy generally cannot be used to qualify you. Exceptions exist for boarder income and for accessory units. Rent from the other units on a multi-unit principal residence is subject to its own rules, and Fannie Mae and Freddie Mac do not treat it identically.

There is one more rent detail. Fannie Mae requires the gross monthly rent of the property to be reported in the delivery data for every two- to four-unit principal residence. That holds even when you are not using the rent to qualify. Expect the appraisal to include a rent schedule and expect the lender to ask about leases.

So keep the pieces apart:

• Qualifying income may include some rent, under agency limits.
• Reserves are measured against the full payment, and rent does not reduce the count.

Where the General Rule Breaks

Six months is the planning number for an owner-occupied 2-4 unit purchase. A few situations move it.

Other financed properties. If you own other homes with mortgages, the reserve requirement can grow. Fannie Mae’s add-on applies when the home you are buying is a second home or investment property. It does not apply when the subject is your principal residence. When it does apply, the calculation excludes the subject property, your principal residence, properties sold or pending sale, and accounts paid off at closing. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.

Cash-out refinances. A cash-out refinance with a debt-to-income ratio above 45% calls for six months on any property type. Cash-out on a 2-4 unit principal residence also tops out at 75% LTV, versus 80% on a one-unit. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.

High-LTV refinances. These are exempt from the minimum reserves at Fannie Mae.

30-day accounts. If you carry charge accounts that must be paid in full each month, reserves equal to those balances are required. A refinance reduces that by the cash you take back.

Lender overlays. An individual lender can ask for more than the agency minimum. That is general industry practice, and a lender’s overlay will always show up in your conditions, not in the agency guide.

Manual underwriting. When a human reviews the file, the Eligibility Matrix sets the months instead of the automated finding. Some programs, such as Freddie Mac’s Home Possible, can set different manual numbers, so confirm any figure with your loan officer before planning around it.

What Does This Look Like for a Real Buyer?

Picture a buyer eyeing a fourplex. They plan to live in one unit and rent three. They have savings, a 401(k), and a brokerage account.

They start by planning the down payment. At 5% down on a 2-4 unit principal residence, they need that percentage of the price, plus closing costs. Those funds come out first. Then they total the full payment: principal and interest, taxes, insurance, and any association dues. Six times that is the reserve target. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.

Their checking balance may fall short of the target. But their vested 401(k) and brokerage balance count toward reserves without being sold, because the guide allows 100% of verified value on securities and no withdrawal on retirement funds. They may clear the test without touching either account.

Now flip it. A second buyer holds only cash, and all of it goes to the down payment and closing costs. Even with strong income, that file has nothing left over. They can adjust in a few ways:

• Reduce the purchase price or the loan size, so the payment and the months shrink.
• Use eligible gift funds where the current guide allows them.
• Consider a one-unit home, which has no minimum reserve under Fannie Mae.
• Wait and build reserves before applying.

A lender can also have a mortgage insurance angle. On loans above 80% LTV, mortgage insurance is required. You can request cancellation at 80% of the original value, and the servicer must end it automatically at 78%. That insurance is part of the PITIA that reserves are measured against, so it raises the target slightly. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.

Key Terms Defined

Reserves: Verified assets you still hold after closing, measured in months of your housing payment.

PITIA: Principal, interest, taxes, insurance, and association dues. It is the payment the reserve months are measured against.

Automated underwriting: Software, Desktop Underwriter at Fannie Mae and Loan Product Advisor at Freddie Mac, that reviews your file and states what the lender must verify.

Manual underwriting: A human review used when the automated system does not approve the file, with the agency’s Eligibility Matrix setting reserves and ratios.

LTV: Loan-to-value, the loan amount as a percentage of the home’s value.

Overlay: An extra requirement a lender adds on top of the agency minimum.

Next Step

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. Start with Lendmire’s conventional loan programs, and ask for a reserve walk-through before you make an offer. Lendmire’s piece Reserves Required After a 2–4 Unit Rental Cash-Out covers the refinance side of the same question. All program details are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

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

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges FHA, VA, conventional and jumbo home purchase and refinance financing in 16 states through wholesale lenders. Every option is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae Selling Guide B3-4.1-01, Minimum Reserve Requirements

2. Freddie Mac Guide Section 5501.2

3. Fannie Mae Eligibility Matrix

4. Fannie Mae Selling FAQ, retirement and investment assets

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