Conventional Mortgage for Investment Property Options

The 15% vs. 25% Down Payment Rule: Unit Count Determines Everything

The most important number for any investor to internalize is this: the minimum down payment for a conventional investment property loan is not a single fixed percentage. It depends entirely on the number of units being purchased.

Single-unit investment properties (non-owner-occupied): Fannie Mae and Freddie Mac require a minimum down payment of 15% — equivalent to a maximum LTV of 85% — for a single-family investment property (Fannie Mae Selling Guide, Section B2-1.1-01, 2026). In practice, most lenders impose overlays that raise this floor to 20% for borrowers with credit scores below 700 or DTI ratios above 40%.

Two-to-four-unit investment properties (non-owner-occupied): Fannie Mae and Freddie Mac both require a minimum down payment of 25% — equivalent to a maximum LTV of 75% — for duplexes, triplexes, and fourplexes purchased as non-owner-occupied investment properties (List With Clever, 2026; Fannie Mae Selling Guide, 2026). There are no exceptions at the agency level for this requirement on non-owner-occupied multifamily purchases, regardless of credit strength or reserve position.

The owner-occupant exception — “house hacking.” A separate path exists for investors willing to live in one unit of a 2-4 unit property for at least 12 months. Under Fannie Mae’s standard guidelines and the HomeReady program, owner-occupant purchasers of 2-4 unit properties can qualify for as little as 5% down (updated November 2023). Freddie Mac’s Home Possible program offers the same 5% option. This owner-occupant strategy — commonly called house hacking — allows investors to build a rental portfolio starting with a dramatically reduced down payment, provided the occupancy requirement is genuinely satisfied.

On a $450,000 single-unit investment property, the difference between 15% and 25% down is $45,000 versus $112,500 — a capital allocation decision that meaningfully affects portfolio growth velocity. Choosing wisely requires understanding not just the down payment minimum, but the full LLPA cost structure that accompanies different down payment tiers.

LTV Requirements for Investment Property Refinances

The LTV rules for refinancing a conventional investment property are more restrictive than for purchase — and the gap between rate-and-term and cash-out transactions is significant.

Rate-and-term (no cash-out) refinance: Fannie Mae permits a maximum LTV of 75% for a rate-and-term refinance on a single-unit investment property, and 70% LTV for 2-4 unit investment properties (Fannie Mae Selling Guide, 2026; Freddie Mac Single-Family Seller/Servicer Guide, 2026). This means the investor must hold at least 25%–30% equity in the property to qualify for a standard conventional refinance — a meaningful equity threshold that catches investors who purchased recently in flat or declining markets.

Cash-out refinance: The maximum LTV for a cash-out refinance on a non-owner-occupied investment property is capped at 75% LTV for a single-unit property and 70% LTV for 2-4 unit properties (Fannie Mae Selling Guide, Section B2-1.3-03, 2026). The 12-month seasoning requirement — established under Fannie Mae Selling Guide Announcement SEL-2023-01 — also applies: the existing mortgage being paid off must be at least 12 months old before a cash-out refinance can close.

On a $400,000 single-unit investment property with a 75% LTV cash-out limit, the maximum loan is $300,000. If the existing mortgage balance is $240,000, the maximum cash accessible is $60,000 before closing costs — a calculation every investor should complete before initiating an application.

For investors seeking higher LTV cash-out options on investment properties, the Fannie Mae cash-out refinance guide covers the standard program in detail, and the non-QM loan guide provides alternatives for investors who need to exceed conventional LTV caps.

Credit Score Requirements: Fannie Mae and Freddie Mac in 2026

Both agencies set a minimum credit score of 620 for conventional investment property loans — but the practical cost of borrowing at 620 versus 740 or above is substantial, and understanding the LLPA pricing structure explains why.

Loan-Level Price Adjustments (LLPAs) are risk-based fees added to the loan’s cost based on credit score and LTV combinations. For investment properties, Fannie Mae applies additional LLPAs on top of the standard matrix specifically because the property is non-owner-occupied. A borrower purchasing a single-unit investment property at 80% LTV with a 680 credit score faces a combined LLPA of approximately 3.375% of the loan amount — on a $350,000 loan, that is $11,812 in added cost, typically absorbed through a higher rate rather than paid upfront (Fannie Mae LLPA Matrix, 2026).

The practical credit score tiers for conventional investment property financing in 2026:

The premium above primary residence rates — typically 0.50%–1.50% for investment properties — reflects the higher default risk the agencies price into non-owner-occupied loans. A 740+ credit score minimizes but does not eliminate this premium.

Freddie Mac applies a similar LLPA framework for investment properties, with slightly different matrices at specific LTV/score combinations. Freddie Mac’s guidelines also impose a minimum 620 credit score but apply separate fee structures at various LTV thresholds — particularly above 85% LTV, where Freddie Mac LLPAs exceed Fannie Mae’s on most score tiers (LHFS Comparison Matrix, 2026). Investors with borderline credit profiles should run loan scenarios under both agency guidelines through their lender to identify which produces better pricing.

Reserve Requirements: The Overlooked Qualification Hurdle

Down payment and credit score get most of the attention — but reserve requirements stop more investment property loan applications than any other single factor. Fannie Mae requires investors to demonstrate liquid reserves after closing based on the number of financed properties they hold:

• 1–6 financed properties: Two months of PITIA reserves on the subject investment property
• 7–10 financed properties: Six months of PITIA reserves on each financed second home and investment property in the portfolio (Fannie Mae Selling Guide, Section B2-2-03, 2026)

Both agencies cap the number of conventional investment property mortgages per borrower at 10 financed properties. Beyond that ceiling, conventional financing is unavailable regardless of credit strength, income, or equity — making alternative programs essential for portfolio scaling. For investors approaching or exceeding this threshold, the how to buy a rental property guide covers alternative financing strategies including portfolio lenders and private capital.

Rental Income Qualification: How Fannie Mae Counts Rent

Using rental income from the subject investment property to qualify requires specific documentation and conservative income calculation methodology.

For purchase transactions: The lender uses a Form 1007 Single-Family Comparable Rent Schedule (for one-unit properties) or Form 1025 Small Residential Income Property Appraisal Report (for 2-4 unit properties) to establish market rent. Fannie Mae then applies a 25% vacancy and expense factor, counting only 75% of the appraised market rent as qualifying income (Fannie Mae Selling Guide, Section B3-3.8-01, October 2026).

For refinance transactions with existing rental history: The lender uses Schedule E from the borrower’s prior two years of federal tax returns, adding back depreciation and one-time expenses to calculate net rental income. The 25% factor is built into the Schedule E analysis framework.

This conservative methodology means that a rental property generating $3,000 per month in gross rent contributes only $2,250 per month of qualifying income — and the full PITIA of the investment property must be factored into the DTI calculation simultaneously. Investors frequently underestimate how rental income is treated and overestimate their qualifying purchasing power as a result.

Conventional vs. Non-QM: When Each Makes Sense

Conventional investment property loans make the most sense for investors who:

• Can satisfy the 15%–25% down payment without straining reserves
• Have a 680+ credit score (lower scores face punishing LLPAs)
• Have fewer than 10 financed properties
• Have fully documentable income through tax returns and W-2s
• Want the lowest long-term rate and a standard 30-year amortizing term

Non-QM alternatives — particularly DSCR loans — make more sense when an investor is self-employed with heavy deductions, holds 10+ properties already, needs a faster close, or has rental income that clearly covers the mortgage but personal DTI that disqualifies them from conventional underwriting. For a comprehensive overview of refinancing options available to investment property owners in 2026, the best rental property refinance guide provides current rate comparisons across conventional and non-QM programs.

The Bottom Line on Conventional Loans for Investment Properties

Conventional mortgages from Fannie Mae and Freddie Mac remain the most cost-effective investment property financing tool available for investors with strong credit and documented income — but the rules are specific, the reserve requirements are frequently underestimated, and the LLPA pricing structure means that credit score optimization before application has measurable dollar value. A 620 score investor and a 740 score investor applying for identical loans on the same property can see a rate difference exceeding 1.50% — representing tens of thousands of dollars over a standard hold period. Knowing these rules before you shop is the difference between qualifying confidently and being surprised at the closing table.

RefiGuide can connect you with conventional and non-QM lenders specializing in investment property financing at no cost and with no obligation.

References

• Fannie Mae. (2026). B2-1.1-01, Occupancy types. Fannie Mae Single-Family Selling Guide.
• Fannie Mae. (2026). B2-2-03, Multiple financed properties for the same borrower. Fannie Mae Single-Family Selling Guide.
• Freddie Mac. (2026). Maximum LTV/TLTV/HTLTV ratio requirements for conforming and super conforming mortgages. Freddie Mac Single-Family Seller/Servicer Guide.

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