DSCR Calculation Example for a Rental Property

Scenario overview and property-level inputs

Assume a fictional rental produces $3,200 of monthly rent and $100 of other recurring income. Vacancy is modeled at 5%. The property has annual tax and insurance plus percentage allowances for management and maintenance and $50 of another monthly operating cost.

The proposed loan is $260,000 at 6.75% for 30 years. The objective is to determine whether modeled NOI covers scheduled annual principal and interest, not whether a lender will approve the transaction. The numbers are an educational example, not an actual property, term sheet, underwriting standard, or promise of financing.

Actual lender underwriting may use different income documentation, vacancy, replacement reserves, repairs, management, taxes, insurance, or debt-service conventions. Some lenders may include expenses absent here or exclude income that this educational model treats as recurring. The ratio must therefore be reconciled with the relevant lender’s definitions.

Step 1: Calculate effective gross income

Rent and other income total $3,300 per month, or $39,600 per year. A 5% allowance removes $1,980.00. Effective gross income is $37,620.00.

The calculator applies vacancy to scheduled rental and other income together. That is an explicit convention. If parking, storage, or another income stream has a different collection pattern, a lender may underwrite it separately. The example keeps the current calculator contract rather than manually adjusting its result.

Effective gross income is not cash flow and does not yet account for the cost of operating the property. It is simply the income expected after the vacancy allowance. Starting DSCR with scheduled rent instead would overstate the numerator because the operating expense step does not independently remove vacancy.

Step 2: Subtract operating expenses for NOI

Management is $3,009.60 and maintenance is $1,881.00, each calculated from effective gross income. Tax, insurance, and the annualized other expense are then added. Utilities and HOA are zero in this scenario but remain explicit inputs that should be changed if the owner is responsible for them.

Mortgage payments are not operating expenses and do not enter NOI. Keeping them separate ensures the numerator describes property operations and the denominator describes financing. Depreciation, income tax, capital gains, appreciation, and principal paydown are also outside this property-level NOI calculation.

Replacement reserves may be treated differently by a lender than by this calculator. An analyst should not assume that the displayed NOI is the underwritten NOI without reviewing the lender’s expense policy and the property’s physical needs.

Step 3: Calculate annual debt service and DSCR

The $260,000 loan at 6.75% for 30 years produces monthly principal and interest of $1,686.36. Multiplying the full-precision payment by 12 gives annual debt service of $20,236.26.

A DSCR above 1.00 means modeled NOI exceeds scheduled debt service. It does not mean the excess is available to the investor after every cash need, because the property may require reserves, capital work, leasing costs, or other items outside the calculator. It also does not guarantee approval.

The calculator’s status labels are product display conventions, not universal lender rules. Different programs may use different minimums, calculate debt service differently, or stress the rate. The numeric ratio and its inputs should remain visible so a reader does not mistake a label for a commitment.

Reverse calculation for an illustrative 1.25 target

For planning only, assume an illustrative target DSCR of 1.25. This is not presented as a universal lender requirement. Reversing the formula shows the NOI that would be required to reach that ratio under the same debt service.

The gap does not say that rent should simply be raised by the same amount. NOI can change through collected income, vacancy, and operating expenses, and each change must be supportable. A lender may also calculate the target NOI with different expense assumptions, making its gap different from this educational result.

Reverse calculation is useful because it turns a ratio into a dollar requirement. It can reveal whether a target depends on a modest evidence-based adjustment or on aggressive assumptions. It should not be used to force inputs until the desired ratio appears.

Sensitivity: raise the interest rate to 7.75%

The alternative case keeps income, vacancy, operating expenses, loan principal, and term unchanged while raising the rate from 6.75% to 7.75%. NOI therefore stays fixed and only the debt-service side of the ratio changes.

The higher rate increases scheduled payment and reduces DSCR even though the property’s modeled operations are identical. That is the central leverage insight: a property can have one NOI but different coverage under different loan terms. A lender may additionally test a higher qualifying rate or different amortization.

A complete sensitivity set could separately change vacancy or expenses, but changing them together with the rate would obscure the cause. The rate-only case clearly identifies financing sensitivity and can be compared with an operations-only downside later.

Interpret DSCR without treating it as approval

The base case indicates modeled NOI covers modeled annual debt service by the displayed ratio. The higher-rate case narrows that coverage. Neither result confirms eligible income, lender value, borrower qualification, loan proceeds, reserves, insurance, property condition, or legal compliance.

Before relying on DSCR, verify leases, deposits and collection history; reconcile trailing operations; review tax bills, insurance, utilities, management, maintenance, and capital needs; and document the proposed loan’s principal, rate, amortization, fees, and payment structure. Ask the lender which income and expenses it uses and whether it applies vacancy, management, repairs, replacement reserves, or rate stress differently.

Preserve both the lender calculation and the internal calculation instead of overwriting one with the other. A short reconciliation can then explain every difference in accepted income, expenses, reserves, and debt service.

DSCR should be read alongside dollar cash flow and physical diligence. A ratio can exceed a target while the remaining cash is small in absolute terms. It can also omit a known capital project if reserves are not included. Cash-on-cash return answers a different investor-capital question, while cap rate excludes financing entirely.

The practical conclusion is conditional: the property covers the modeled base debt service, but the ratio is sensitive to the financing rate and underwriting definitions. That supports further verification and lender-specific reconciliation rather than a promise of approval or a categorical investment recommendation.