How Rental Income Is Calculated

Lenders use the 75% rule: they take the documented rental income and multiply it by 75%. The remaining 25% is a vacancy and maintenance buffer. This 75% figure is added to your gross income to help you qualify.

Example: If a property rents for $2,000/month, the lender counts $1,500 ($2,000 x 75%) as qualifying income. This $1,500 is added to your other income to calculate your DTI.

What it means in money: a $1,500 monthly income boost can add meaningful buying power to your loan amount, roughly $80,000 to $100,000 of additional purchase price at typical rates and terms. That is the difference between a starter home and the one you actually want.

The real-world caveat: the 25% buffer is the lender's way of pricing in empty months and repair bills, so do not fight it. Plan your cash flow on 75% of rent and you will never be caught short when a tenant moves out.

Documentation Requirements

• Signed lease agreement (current or future tenant)
• 12 months of rental history (bank deposits or canceled checks)
• Schedule E from tax returns (if you have owned rental property before)
• Lease or appraisal-based rent estimate (for new properties without a tenant)

What it costs to be disorganized: landlords who cannot show deposits, leases, or Schedule E leave qualifying income on the table, or worse, get it counted at zero. The paperwork is the proof, and clean records are what let the income count.

How It Affects Your DTI

Rental income increases your qualifying income, which lowers your DTI. This can help you qualify for a larger loan or improve your chances of approval. The property's own mortgage payment, taxes, and insurance are also factored in.

What it means in money: every $300 a month of net qualifying income is roughly $50,000 of additional loan amount at typical terms. Rental income quietly does the heavy lifting for investors who have been told they cannot qualify.

The real-world play: lenders offset the new property's payment, taxes, and insurance against the rent, so a property that cash flows on paper helps, and one that loses money on paper hurts. I run the full picture before you apply, so there are no surprises at underwriting.

Using Rental Income for Multiple Properties

If you already own rental properties, the income from those properties is counted when you apply for a new mortgage. Lenders will look at Schedule E of your tax returns to see the net income or loss from each property. Some properties may show a loss on paper due to depreciation, which can actually hurt your qualification.

What it means in money: depreciation makes a profitable rental look like a loss on paper, and that paper loss can shrink your qualifying income right when you want to buy again. It is one of the sneakiest traps in investor lending.

The real-world fix: I have investors who add depreciation back or restructure their records so the true cash flow shows. Know how each property reads on Schedule E before you apply, because the tax answer and the loan answer are not always the same.

Appraisal-Based Estimates

For properties you are buying as an investment, some lenders allow the appraiser to provide a market rent estimate. This can be used even without a signed lease. The appraiser compares your property to similar rentals in the area.

What it means: a solid market-rent appraisal can let you count income on day one, before a tenant ever signs. That is how new investors qualify for the next property with less history than seasoned landlords.

The real-world caveat: the appraiser's rent estimate is conservative on purpose, so set your expectations to 75% of it. Make it a great one: prepare your records before you apply, and rental income becomes the lever that grows your portfolio.