Conventional Loan for Investment Properties: Rules and Limits

Conventional loans are among the most powerful and widely misunderstood tools in a real estate investor’s financing arsenal. Most investors start here — conventional is familiar, available through virtually every lender, and often priced competitively for qualified borrowers. But there’s a ceiling, and knowing where it sits — and what to do when you hit it — is what separates casual landlords from serious portfolio builders.

This guide covers everything you need to know about using conventional loans for rental properties: the down payment requirements, reserve mandates, how rental income factors into qualification, the Fannie Mae 10-property rule, multi-unit guidelines, cash-out refinance mechanics, and the point at which it makes sense to pivot to a different product entirely.

Why Investors Use Conventional Loans

Before getting into the rules, it’s worth understanding the draw. Conventional loans offer something most non-QM investment products don’t: access to Fannie Mae’s and Freddie Mac’s secondary market pricing, which typically translates to competitive terms for well-qualified borrowers. They’re also widely available — most banks, credit unions, and mortgage companies originate conventional loans, giving investors options and negotiating leverage.

For investors who have strong W-2 income, low debt, solid credit, and a modest number of financed properties, conventional is often the most straightforward and cost-effective path. The complications arise as your portfolio grows.

Down Payment Requirements for Investment Properties

This is where many investors first encounter a hard truth: the 3-5% down payment that applies to owner-occupied primary residences does not carry over to investment properties. Fannie Mae and Freddie Mac apply meaningfully higher down payment floors for non-owner-occupied properties, reflecting the higher default risk investors present compared to homeowners.

Single-Family Investment Properties (1 unit)

• Minimum down payment: 15% for most standard conventional loans on a 1-unit investment property
• Some lenders require 20-25% depending on credit profile, reserves, and number of financed properties
• The 15% minimum typically comes with pricing adjustments (LLPAs) that make 20-25% down a more practical target for most investors

2-4 Unit Investment Properties

• Minimum down payment: 25% for 2-4 unit investment properties under Fannie Mae guidelines
• This applies regardless of how strong your credit or income is — it’s a hard floor, not a sliding scale
• Multi-unit properties carry additional reserve requirements (more on this below)

These down payment floors aren’t arbitrary. They reflect the risk adjustment lenders and the GSEs need to make conventional investment loans viable at scale. If these numbers feel steep, there are alternatives — but that comes later in this guide.

Reserve Requirements: The Hidden Qualification Hurdle

Credit score and down payment get most of the attention, but reserve requirements quietly knock out a significant number of investor loan applications. Reserves are the liquid assets you maintain after closing — the financial cushion lenders want to see, demonstrating you can service your mortgage even if the property sits vacant or expenses run high for a stretch.

Standard Reserve Requirements for Investment Properties

• Single-family investment property: Typically 6 months of PITI (principal, interest, taxes, and insurance) reserves for the subject property
• 2-4 unit investment properties: Typically 6 months PITI reserves per unit or for the full property
• Properties 5-10 (advanced investor guidelines): 6 months reserves on each financed property — including your primary residence — not just the subject property

That last point deserves emphasis. If you’re financing your 7th investment property and you have 6 other financed properties, your lender is going to want to see reserves covering all of them. For a portfolio of properties with $3,000/month PITI each, that could mean $108,000 or more in required liquid reserves just to close. This requirement alone leads many experienced investors to seek portfolio financing or DSCR products that use different reserve calculations.

The 10-Property Fannie Mae Limit

The single most well-known constraint on using conventional loans for real estate investing is the 10-financed-property limit established by Fannie Mae. Under standard guidelines, a borrower can have no more than 10 financed properties (including their primary residence) at the time of application for a new conventional loan.

The rules are structured in two tiers:

Properties 1 Through 4

Standard investment property guidelines apply. The requirements are more accessible: lower minimum credit scores (typically 620, though 680+ for better pricing), the 15-25% down payment range described above, and reserve requirements limited to the subject property and primary residence.

Properties 5 Through 10

When you apply for financing on property number 5, 6, 7, 8, 9, or 10, the rules tighten considerably:

• Minimum credit score of 720 (some lenders require 740)
• Minimum 25% down on single-family investment properties
• Minimum 30% down on 2-4 unit investment properties
• 6 months PITI reserves for each financed property, including your primary residence
• No 30-day late payments in the past 12 months on any mortgage
• No bankruptcy or foreclosure in the past 7 years

What counts toward the 10-property limit? Financed residential properties (1-4 units) where you’re personally obligated on the mortgage — regardless of whether you’re on title. Commercial properties, properties owned in certain entity structures (depending on circumstances), and properties with no mortgage typically do not count. Confirm the exact treatment with your loan officer, as nuances matter.

When You Hit the Ceiling

Property number 11 is where conventional Fannie/Freddie guidelines stop. You haven’t run out of options — but you have graduated to a different market. At this point, many investors turn to:

• DSCR loans — which have no property count limit and qualify based on the property’s rental income rather than personal income
• Portfolio loans — lenders who hold loans in-house and write their own guidelines
• Commercial real estate financing — appropriate as properties move into commercial territory
• Bank statement loans — useful for self-employed investors who want income flexibility alongside portfolio growth

Using Rental Income to Qualify

One of the more nuanced aspects of conventional investment property financing is how rental income gets factored into qualification. The short version: it’s not as simple as taking your actual rent roll and adding it to your income.

Subject Property (the property you’re financing)

For purchase transactions, Fannie Mae allows lenders to use 75% of the market rent (documented by a rent schedule on the appraisal or an executed lease) to offset the housing payment. So if the appraiser estimates $2,000/month in market rent, lenders can credit $1,500/month toward your income — helping your DTI. The 25% haircut accounts for vacancy and maintenance.

Existing Rental Properties

For properties you already own and rent out, lenders want documentation. Schedule E from your tax returns is the standard — and here’s where things get complicated for investors who depreciate aggressively or carry high expenses on their returns. Depreciation, mortgage interest, and other deductions reduce the net rental income that shows up on Schedule E, sometimes dramatically. A property generating $3,000/month in gross rent might show negative income on paper after all the deductions are applied — which can actually hurt your DTI rather than help it.

Lenders typically add back depreciation (which is a non-cash deduction) but still use the Schedule E figures as the starting point. If this dynamic is squeezing your conventional qualification, a DSCR loan sidesteps the issue entirely by qualifying on the property’s gross rental income relative to the debt service — not your personal tax picture.

Multi-Unit Conventional Financing: 2, 3, and 4 Units

Conventional loans cover 1-4 unit residential properties. Two-, three-, and four-unit properties (duplexes, triplexes, and quadplexes) follow slightly different rules depending on occupancy:

Owner-Occupied Multi-Unit

If you live in one unit and rent the others — often called “house hacking” — conventional loans can be used with owner-occupied down payment requirements. You may be able to put down as little as 5% on a 2-unit owner-occupied property (3.5% for FHA). Rental income from the other units can be used to help qualify, often with lender-specific overlays on how it’s calculated.

Investment Multi-Unit

For non-owner-occupied 2-4 unit properties, the 25% down payment requirement applies (and 30% down for properties 5-10 in your portfolio). Rental income from all units can be used for qualification — typically 75% of market or actual rents from the appraisal — but reserve requirements are correspondingly higher given the larger loan amounts and multiple units involved.

Five-unit properties and above fall into commercial territory and are not eligible for conventional residential financing. They require commercial mortgage products, which operate under entirely different guidelines and structures.

Cash-Out Refinance Rules for Investment Properties

Cash-out refinancing is a foundational strategy for portfolio growth — use equity from existing properties to fund down payments on new acquisitions. Conventional guidelines allow cash-out refis on investment properties, but the parameters are meaningfully more restrictive than on primary residences:

• Maximum loan-to-value (LTV): 75% on 1-unit investment properties (meaning you must maintain at least 25% equity after the cash-out). For 2-4 unit investment properties, the maximum LTV drops to 70%.
• Credit score: Minimum 620, though most investors in the cash-out refi space will need 680+ for standard pricing and 720+ if they’re past property 4 in their portfolio.
• Waiting period: For a cash-out refi on a recently purchased investment property, Fannie Mae generally requires the property to have been titled in your name for at least 6 months before you can cash out.
• Delayed financing exception: If you purchased with cash and want to take cash out immediately, there is a Fannie Mae delayed financing exception — but it requires documentation that the original purchase was arm’s length and funded with your own funds, and you can only recoup the original purchase price (plus closing costs), not any appreciation.

When to Switch from Conventional to DSCR

Conventional loans are the right choice — until they’re not. Here are the most common inflection points where investors should seriously consider making the switch to a DSCR product:

• You’re approaching or past 10 financed properties. This is the definitive trigger. DSCR has no property count limit.
• Your personal income doesn’t support the DTI. Self-employed borrowers with aggressive write-offs, passive investors with complex tax returns, or high earners whose paper income doesn’t reflect their actual cash flow often find DSCR a cleaner path.
• You want faster closings. DSCR underwriting focuses on the property’s income, not your full financial picture — which can mean a simpler, faster process without the same document burden.
• You’re scaling a portfolio entity. DSCR loans can often be structured into LLCs and other entities in ways that conventional loans typically cannot, simplifying portfolio management and liability protection.
• Your properties have strong cash flow but high purchase prices. Properties in certain markets may justify DSCR financing even early in a portfolio if the cash flow story is compelling and the conventional qualification process is cumbersome.

DSCR loans are not a fallback for borrowers who can’t qualify conventionally — they’re a purpose-built product for investors who need flexibility that conventional guidelines simply weren’t designed to provide. The right tool depends on where you are in your portfolio journey.

Building Your Conventional Loan Strategy

Smart investors think about conventional loan eligibility as a resource to be managed, not just a box to check. If you have 10 conventional “slots” available in your lifetime portfolio (assuming Fannie guidelines hold), how do you deploy them most effectively? Some frameworks worth considering:

• Use conventional on your highest-value acquisitions. If you’re buying a $700K fourplex, the pricing advantage of conventional over DSCR is more meaningful than on a $150K single-family. Save the conventional slots for the deals where they have the most impact.
• Don’t rush into slots 5-10 without a plan. The reserve requirements for properties 5-10 are substantial. Make sure your liquid position can absorb the full reserve mandate without leaving you cash-poor.
• Document your rental income for future qualification. If you expect to keep using conventional financing, maintaining clean Schedule E income — which might mean being strategic about depreciation and deductions — can protect your qualifying income picture over time.
• Build relationships with lenders who know investor lending. Not every loan officer has deep experience with the properties 5-10 guidelines, multi-unit rules, or cash-out refi mechanics. Working with someone who does can mean the difference between an approval and an unnecessary denial.