Many real estate investors are familiar with the 1% rule, but the 50% rule offers another quick way to screen a potential rental property.
The rule assumes that approximately half of a property’s gross rental income may be needed for operating expenses, leaving the other half to cover debt payments and potential cash flow. It is a preliminary estimate—not a substitute for reviewing actual expenses or a lender’s underwriting requirements.
The following three steps can help investors complete an initial assessment.
Start with the property’s annual gross rental income and divide it in half.
For example, a property generating $36,000 in annual rent would produce an estimated $18,000 in operating income under the 50% rule.
The expense allowance may account for items such as:
Actual expenses may be higher or lower depending on the property, market, and operating strategy. Rising insurance, taxes, and maintenance costs make it especially important to replace the estimate with verified figures during due diligence.
Next, estimate the proposed loan amount and calculate the annual principal and interest payments using the anticipated rate and amortization period.
Excel’s PMT function can assist with the calculation:
=PMT(monthly interest rate, number of monthly payments, loan amount)
Multiplying the result by 12 provides estimated annual principal and interest.
Care should be taken not to count expenses twice. When DSCR is calculated using NOI, property taxes and insurance are generally included in operating expenses rather than debt service. Some rental loan programs instead compare gross rent with PITIA—principal, interest, taxes, insurance, and association dues. The lender should confirm which method applies.
Debt service coverage ratio, or DSCR, measures the relationship between qualifying property income and the applicable debt obligation.
A common portfolio calculation is:
DSCR = Annual NOI ÷ Annual debt service
A higher DSCR generally indicates a larger income cushion. A ratio below the lender’s requirement may reduce the available loan amount or require additional equity.
Requirements vary by loan program and transaction. CoreVest’s current Portfolio DSCR Loan can consider eligible transactions with DSCR down to 1.00x and leverage of up to 80% of property value, subject to underwriting and other requirements.
The 50% rule can help investors complete a quick initial cash-flow estimate, but it cannot determine whether a property will qualify for financing. Actual rents, operating expenses, property value, loan terms, and lender calculations must still be reviewed.
CoreVest provides business-purpose financing for residential real estate investors. Contact CoreVest to receive a preliminary review based on the specific property or portfolio.
This article is provided for informational purposes only and does not constitute financial, investment, tax, legal, real estate, or lending advice. The 50% rule is a general estimate and may not reflect actual expenses or cash flow. Loan proceeds, leverage, DSCR requirements, and eligibility vary by borrower, property, program, and transaction. All loans are subject to underwriting, credit approval, program availability, and applicable terms and conditions.
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