How to finance an investment property: mortgage requirements, down payments, and rental income rules
Investment property mortgages have stricter requirements than primary residence loans — typically 15–25% down, higher rates, and tighter DTI limits. This guide covers how lenders underwrite rental properties, how rental income is counted, DSCR loan alternatives, and the real cost difference vs a primary mortgage.
Investment property loans are fundamentally different from primary residence mortgages — higher down payments, higher rates, and stricter rental income documentation requirements. Whether you're buying a single-family rental or a small multi-unit building, understanding how lenders underwrite these loans determines how much you can borrow and whether the deal pencils.
Investment property vs primary residence: key differences
| Feature | Primary residence | Investment property (1-unit) | Investment property (2–4 unit) |
|---|---|---|---|
| Minimum down payment | 3–5% | 15% | 25% |
| Rate premium | Base rate | +0.5–0.75% | +0.75–1.0% |
| FHA eligible? | Yes | No | Only if owner-occupied |
| VA eligible? | Yes | No | Only if owner-occupied |
| Rental income counted? | N/A | 75% of market rent | 75% of market rent (non-occupied units) |
| DTI limit (typical) | 45–50% | 43–45% | 43–45% |
| Reserves required | 2 months PITIA | 6 months PITIA | 6 months PITIA |
Step-by-step: how to qualify for an investment property loan
Lenders classify properties as primary residence, second home, or investment property. Investment properties (non-owner-occupied) trigger higher rates, larger down payments, and stricter underwriting. Even renting out one unit of a 2–4 unit property you occupy changes the loan type and qualifying rules.
Single-family investment properties require a minimum 15% down for conventional loans; 2–4 unit investments require 25% down. FHA and VA loans cannot be used for pure investment properties — only for owner-occupied units in multi-family buildings. The higher down payment also affects which rate tier you qualify for.
Lenders use your full DTI including the proposed investment property PITIA payment. Rental income offsets this — but only 75% of market rent (or Schedule E net income) is counted against the payment. Build a conservative cash flow model before applying.
For properties you already own and rent, provide 2 years of Schedule E from your tax returns. For new acquisitions, a lease agreement or appraiser's market rent analysis supports projected rental income. Fannie Mae's rental income calculation worksheet determines how much of gross rent offsets your DTI.
Debt Service Coverage Ratio (DSCR) loans qualify based on the property's rental income vs the mortgage payment — not your personal income. DSCR ≥ 1.25 (rent covers 125% of PITIA) typically qualifies. These are non-QM loans with higher rates but can work for self-employed investors or portfolio builders.
Investment properties carry a rate premium of 0.5–0.75% over primary residence rates with equivalent credit and LTV. On a $400,000 loan, 0.625% higher rate adds roughly $160/month. Model this premium into your net operating income projections to ensure the deal still makes sense.
Conventional loan vs DSCR loan comparison
- Qualifies on personal income + rental income
- Requires 2 years tax returns, W-2s/1099s
- Rate: market rate + 0.5–0.75% premium
- Sold to Fannie Mae/Freddie Mac
- Max 10 financed properties (conventional)
- Best for: W-2 employees, strong personal income
- Qualifies on property's rental income alone
- Minimal personal income documentation
- Rate: market rate + 1–2% premium
- Portfolio or private lender (not Fannie/Freddie)
- No limit on financed properties (lender sets limits)
- Best for: self-employed, portfolio investors
Rental property cash flow model
Negative cash flow on paper may still make financial sense with appreciation, equity paydown, and depreciation tax benefits modeled over a 5–10 year hold period.
External references
- Fannie Mae — Occupancy types and property eligibility
- Fannie Mae — Rental income calculation matrix
- CFPB — Non-qualified mortgage (non-QM) overview
- IRS Publication 527 — Residential rental property
- IRS — Like-Kind Exchanges (1031) overview
- Freddie Mac — Primary Mortgage Market Survey
Common questions
What is the minimum down payment for an investment property?
Conventional loans require a minimum 15% down for single-family investment properties and 25% down for 2–4 unit investment properties. There is no FHA option for pure investment properties — FHA requires owner occupancy of at least one unit in a multi-family. The Fannie Mae occupancy and property eligibility guidelines detail down payment requirements by property type and occupancy.
How does rental income count toward mortgage qualification?
For properties you already own: Fannie Mae and Freddie Mac use 75% of gross rents shown on Schedule E, or net rental income (gross rents minus expenses) if positive. For new acquisitions: 75% of market rent as determined by a signed lease or appraisal rent schedule. Income must be documented with 2 years of tax returns or a current lease agreement. The Fannie Mae rental income matrix provides the full calculation methodology.
What is a DSCR loan and how does it work?
A Debt Service Coverage Ratio (DSCR) loan qualifies based on the investment property's income, not the borrower's personal income. Lenders divide the property's gross rental income by the annual mortgage payment (PITIA). A DSCR of 1.0 means rent exactly covers the payment; most lenders require 1.20–1.25. DSCR loans are non-QM (not sold to Fannie/Freddie), so rates are higher by 1–2%. The CFPB's overview of non-QM mortgages covers the regulatory context.
Can I use a 1031 exchange to defer capital gains when selling an investment property?
Yes — a 1031 like-kind exchange allows you to defer capital gains taxes by reinvesting proceeds from a sold investment property into a replacement investment property of equal or greater value, meeting strict timelines (45 days to identify, 180 days to close). This is a powerful wealth-building tool for real estate investors. The IRS Like-Kind Exchanges guidance and IRS Publication 544 cover the requirements.
How much higher are investment property mortgage rates than primary residence rates?
Investment properties typically carry a rate premium of 0.5–0.75% above comparable primary residence loans — sometimes higher for 2–4 unit properties or higher LTVs. This premium reflects greater default risk: investors are statistically more likely to stop paying an investment property mortgage before a primary residence. Check the Freddie Mac Primary Mortgage Market Survey for current market rates as a benchmark.
What expenses can landlords deduct on rental income taxes?
Rental property landlords can deduct mortgage interest, property taxes, insurance, repairs and maintenance, property management fees, depreciation (residential property over 27.5 years), professional fees, and travel for property management. Depreciation is the most powerful deduction — on a $400,000 rental, the annual depreciation deduction is approximately $14,545. The IRS Publication 527 on residential rental property covers all deductible expenses and depreciation rules.
Run your investment property payment on the mortgage calculator — or check your full buying capacity with the affordability calculator.