How Much Cash a House Hacker Needs With FHA or Conventional Loans

The Quick Read: Your cash goes into four buckets: the down payment, closing costs, prepaid items, and savings the lender wants left over after closing. FHA asks for a 3.5% minimum investment, and conventional asks for 5%. On a three- or four-unit building, though, FHA also wants reserves, which can matter more than the down payment. The down payment is rarely the number that decides whether you can buy.

What Counts as Cash on a House Hack?

Cash on a house hack means everything you must have in the bank, not just the down payment. Lenders look at what you pay at closing and what you still hold afterward. Those are two different tests.

House hacking means buying a two- to four-unit building, living in one unit, and renting out the others. The rent helps you carry the mortgage. Because you live there, you can use owner-occupant loans, which ask for far less money down than an investor loan.

Here are the four buckets:

• Down payment. Your required investment in the purchase.
• Closing costs. What it costs to set up the loan and transfer the property.
• Prepaids. Taxes, insurance and interest paid ahead of time and set aside in escrow.
• Reserves. Verified savings left after closing, usually counted in months of your full housing payment.

Many first-time house hackers budget for the first bucket and get surprised by the last one. Across the FHA loan programs we arrange through wholesale lenders, the pattern repeats. Buyers pass the down payment test easily, then stall on reserves when the building has three or four units.

Add one more item for your own planning: a repair and vacancy cushion. A lender won’t ask for it. A tenant who moves out in month two will.

How Much Cash Do You Need With FHA vs. Conventional?

FHA needs a 3.5% minimum investment, and conventional needs 5% on an owner-occupied two- to four-unit purchase. FHA has the lower entry point, but it also adds an upfront mortgage insurance charge and stricter rules on larger buildings. Conventional shifts the cost into other places.

Two notes on the FHA column. The 3.5% applies from a 580 decision score, and the wholesale programs we place files with start at 580. The upfront premium is financed into the loan, so it raises your balance without raising your cash at closing. The annual premium depends on loan term, loan amount and LTV. On a thirty-year loan above 90% LTV, it lasts for the full term. At or below 90%, it ends after eleven years. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

FHA loan limits are set by county and change every year. Check your county limit before you pick a price range, especially for a four-unit building.

Conventional reserves depend on the file, the unit count and the automated finding. Get that number from a loan officer for your specific property rather than trusting a rule of thumb.

How the Loan Is Underwritten, Step by Step

Underwriting a house hack runs through six checks, in order. Each one changes how much cash you need or how much rent the lender will count. Knowing the order helps you plan.

Step 1: Pick the program. FHA and conventional both treat an owner-occupied two- to four-unit property as your principal residence. Fannie Mae’s eligibility matrix shows a 95% maximum LTV for these purchases, which is where the 5% conventional minimum comes from. Older rules that demanded much more down on multi-unit homes no longer apply to owner-occupied purchases.

Step 2: The appraisal. For rental income on a two- to four-unit property, HUD requires an appraisal showing fair market rent. The appraiser uses a small residential income property report and may consider leases if they exist. The HUD Mortgagee Letter 2023-17 lays this out.

Step 3: Count the rent. With no rental history on the property, FHA counts 75% of the lesser of two numbers: the appraiser’s market rent or the rent in the lease. The missing 25% covers vacancy and upkeep. Your household has to absorb that gap from its own income and savings.

On both programs, counted rent is added to your income. It is not subtracted from your payment. Fannie Mae’s rental income job aid says the same for a conventional two- to four-unit principal residence: the full payment stays in your debt ratio.

Step 4: Check the ratios. The base FHA pair is 31/43, meaning housing cost over income and total debt over income. Documented compensating factors can stretch that to 40/50 at the top tier. The automated finding governs most files.

Step 5: The self-sufficiency test (three to four units only). FHA asks whether the building’s own rent can carry its payment. The lender takes the appraiser’s rent from all units, including yours. It subtracts a vacancy and maintenance allowance and compares the result with the full housing payment. Strong personal income does not rescue a failing test. Conventional underwriting has no FHA-style test.

Step 6: Verify reserves. The lender documents your liquid savings after closing. HUD defines reserves as verified liquid assets minus the funds you must pay at closing. Gift funds, equity in another property, and cash from a cash-out refinance do not count.

Worked Example: One Building, Two Loans

Picture a buyer purchasing a fourplex and living in one unit. Say the price is a round figure, and call it P. The math below stays in percentages and months, because your own price drives the dollars.

• Down payment: 3.5% of P.
• Financed amount: 96.5% of P, plus the 1.75% upfront premium rolled into the loan.
• Closing costs and prepaids: a percentage of P that varies by area and by how much you escrow.
• Reserves: three months of your full housing payment, held after closing.
• Total cash: 3.5% of P + closing costs + prepaids + three months of reserves.

• Down payment: 5% of P.
• Financed amount: no more than 95% of P.
• Closing costs and prepaids: similar categories, similar scale.
• Reserves: whatever the automated finding and file call for.
• Total cash: 5% of P + closing costs + prepaids + required reserves.

The gap in down payment is 1.5% of the price. On a four-unit building, three months of full payment can easily exceed that. So the FHA path is not automatically cheaper in cash terms. It is cheaper at the closing table and heavier afterward.

Now picture the same buyer on a duplex. The reserve rule for FHA drops for one- and two-unit properties. For manual underwriting, HUD sets it at one month. That makes the FHA cash advantage clearest on a duplex.

Where the General Rule Breaks

The rules above hold for most files. A few situations bend them, and each one can change your cash figure.

Duplex versus three or four units. Both the three-month reserve and the self-sufficiency test start at the third unit. A duplex skips the test and carries a lighter reserve requirement. If you are choosing between a duplex and a triplex, this gap is a real part of the price comparison. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

Compensating-factor files. Some lenders require more reserves when they approve a manual file on the strength of savings. A lender program sheet we reviewed shows three months for one to two units and six for three to four. Treat that as an example of how overlays vary, not as a rule.

Accessory dwelling units. If a one-unit home has a legal ADU and you use that rent to qualify, FHA requires two months of reserves. Conventional rules treat ADU income differently and are narrower, so ask before counting on it.

Appraiser rent versus actual leases. A tenant paying above market doesn’t help you. FHA uses the lesser figure. A vacant unit with no lease relies on the appraiser’s number alone.

Occupancy. Both programs require that you live in the building as your principal residence. Fannie Mae allows named exceptions, such as a parent or an adult disabled child occupying the home. Don’t treat a plan to move out in month two as an option.

Cash-out on a house hack later. Fannie Mae’s matrix caps cash-out refinances on two- to four-unit properties at 75% LTV. Pulling money out of a house hack is a tighter test than buying it. If you plan to leave FHA down the road, Lendmire’s piece How Much Equity an FHA Borrower Needs for a Conventional Cash-Out walks through that math. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

What Do Closing Costs and Prepaids Include?

Closing costs are the upfront charges to get your loan and transfer ownership. Prepaids are the taxes, insurance and interest you pay ahead and set aside in escrow. Together they are usually a notable slice of cash to close, and they scale partly with price.

The CFPB’s Loan Estimate explainer defines Estimated Cash to Close as your down payment and closing costs, minus any deposit already paid, seller credits and other adjustments. That figure does not include reserves. A buyer can have enough to close and still fall short on reserves for a three- or four-unit building.

Some charges rise with price, such as the transfer-related fees and escrowed taxes. Others stay roughly the same no matter what you buy, such as appraisal and inspection work. On a multi-unit building, the appraisal is a bigger job because of the rent analysis. Ask your loan officer which items scale and which are fixed on your property.

Ways to Bring Less Cash to the Table

You can lower the cash you bring, but each lever has a limit and sometimes a trade-off. Use them with open eyes.

• Seller contributions. FHA allows seller or interested-party contributions up to 6% of the price. These reduce cash to close, not your required investment.
• Financed upfront premium. The 1.75% rolls into the loan. That saves cash today and adds to the balance and the monthly payment.
• Gift funds. They may help with closing, subject to lender guidelines and documentation. They do not count as reserves.
• A non-occupant co-borrower. FHA allows one. That person can help you qualify, but the home must still be your residence.
• Lower price or fewer units. A duplex has lighter reserves than a fourplex. Sometimes the smaller building is the better first step.

One honest caution. Financing a cost doesn’t remove it. It moves it into the loan, and you pay it back with interest over the term.

FHA or Conventional: Which Needs Less Cash for You?

It’s close to a toss-up on paper, and your file decides it. The stronger play for a buyer with modest savings and a duplex is often FHA, because the lower down payment and lighter reserves help. The calculation changes on a three- or four-unit building, where reserves and the rent test enter the picture.

Use this list to sort out your situation:

1. Credit score near the floor. FHA’s 580 entry point suits borrowers who would struggle to get conventional pricing. Conventional mortgage insurance usually responds more strongly to credit.

2. Thin savings, duplex. FHA usually needs the least cash.

3. Decent savings, three to four units. Compare both. Conventional avoids the self-sufficiency test and the upfront premium.

4. Weak building rent. If the building can’t pass the FHA rent test, conventional may be the only path.

5. Plans to refinance later. FHA mortgage insurance can be shed through a refinance when equity builds. That’s a real consideration, but it adds a second set of closing costs.

Your Reserve and Cash Cushion Worksheet

Build your own number before you make an offer. Write each line in your own dollars, using estimates from your loan officer.

• Down payment: the minimum for your program, as a percentage of price.
• Closing costs and prepaids: from a Loan Estimate on your property.
• Reserves: months of full payment, based on unit count.
• Repair cushion: your own buffer for the first year.
• Vacancy cushion: at least a month of rent on your largest rented unit.

Once you have a Loan Estimate, compare it with the Closing Disclosure you receive before closing. The CFPB’s Closing Disclosure guide tells you to check that Cash to Close and Closing Costs match, and to ask why if they changed significantly. Save the paperwork showing where your funds came from, since lenders review the source of your cash.

Key Terms Defined

Minimum required investment: The cash you must put into the purchase. For FHA it is 3.5% of the lesser of price or appraised value.

Closing costs: The upfront charges to set up the loan and transfer ownership.

Prepaids: Taxes, insurance and interest paid ahead of time and held in escrow.

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

PITI: Principal, interest, taxes and insurance. This is your full housing payment, with mortgage insurance added where it applies.

Self-sufficiency test: An FHA check on three- and four-unit buildings. It asks whether the building’s rent can carry its own payment.

Cash to close: Down payment plus closing costs, minus deposits and credits. It does not include reserves.

Your Next Step

If you are buying a home and want to see whether an FHA loan fits your file, Lendmire can help you compare the options and what each one asks of the file. Every figure here is 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

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and home buyers in 16 states with FHA, VA, conventional and jumbo purchase and refinance loans arranged through wholesale lenders. Lendmire is never the lender; program terms are set by the lender and the agency guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. Fannie Mae Eligibility Matrix

2. HUD Mortgagee Letter 2023-17

3. Fannie Mae DU job aid on rental income

4. CFPB Loan Estimate explainer

5. CFPB Closing Disclosure explainer