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How to Calculate NOI and DSCR

Portrait of Dennis Shirshikov
Dennis Shirshikov
Finance and Real Estate Author
Chris Ledwidge
Co-founding Partner and EVP at theLenderUpdated
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Content

Net operating income (NOI) is a property's gross operating income minus the operating expenses required to run it. For a commercial real estate loan, a lender may divide NOI by annual debt service to calculate the debt service coverage ratio (DSCR). For the supplied theLender long-term-rental DSCR execution, the calculation is different: eligible gross monthly rent is divided by monthly principal, interest, taxes, insurance, and association dues (PITIA). Start by identifying which formula your lender will use.

Use the calculator below for an educational estimate. It shows both conventional property NOI and the supplied residential-style LTR DSCR calculation. A lender's approved appraisal, rent evidence, expense treatment, loan payment, and current program matrix control qualification.

NOI and DSCR Calculator


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Monthly gross rent


Other monthly operating income

Monthly vacancy and credit loss

Monthly operating expenses

Monthly debt service

Monthly PITIA for LTR DSCR

Annual NOI

$36,000

NOI-based DSCR

1.25

theLender LTR DSCR estimate

1.25

Operating expenses can include management, repairs, utilities paid by the owner, property taxes, insurance, and other recurring property costs. Do not include mortgage principal or interest in the NOI expense field. The LTR DSCR result uses gross rent and PITIA separately.


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What NOI Means

NOI measures income from property operations before financing costs, income taxes, depreciation, and capital expenditures. The basic annual formula is:

NOI = gross operating income − vacancy and credit loss − operating expenses

Gross operating income may include rent, parking, laundry, storage, and other recurring property income. Operating expenses may include property taxes, insurance, management, owner-paid utilities, routine repairs, maintenance, and association costs when applicable. The Internal Revenue Service's Publication 527 lists common residential rental income and expense categories. Tax reporting and underwriting NOI are separate analyses, so a lender may classify or normalize an item differently.

Mortgage principal and interest stay outside NOI. They belong in debt service. Depreciation and income taxes also stay outside the property-level NOI calculation. Track major replacements and improvements through separate capital-expenditure treatment. Keep them out of routine operating expenses.

How to Calculate NOI Step by Step

1. Establish potential rental income

Use current leases, a rent roll, and documented ancillary income. For a one-unit investment property, an appraiser may use the Single Family Comparable Rent Schedule, Form 1007 to estimate market rent from comparable rentals. The lender selects actual rent, market rent, or another permitted amount under the applicable guidelines.

2. Apply vacancy and collection loss

Reduce potential income for expected vacancy, concessions, and uncollected rent when the lender's method requires it. Support the assumption with property history and local market evidence. A fully leased month does not prove that a property will remain fully occupied for an entire year.

3. Add other recurring property income

Include documented income tied to property operations, such as parking or laundry revenue, when the lender accepts it. Exclude one-time receipts and refundable deposits from recurring income.

4. Subtract operating expenses

Use current bills, historical operating statements, contracts, tax assessments, insurance quotes, and a realistic maintenance budget. Determine the required management fee and replacement-reserve treatment, including cases where the owner performs the work or postpones a replacement.

5. Annualize the result consistently

Keep every input on the same time basis. Multiply monthly NOI by 12 before dividing it by annual debt service. A monthly calculation can divide monthly NOI by monthly debt service. Mixing monthly income with annual debt service produces a meaningless ratio.

How NOI Becomes a DSCR

For income-producing commercial real estate, DSCR commonly compares NOI with required principal and interest payments. The Office of the Comptroller of the Currency's Commercial Real Estate Lending handbook explains that lenders analyze a property's income-generating capacity and debt-service coverage, along with assumptions, property condition, collateral value, borrower strength, and guarantor support.

The basic relationship is:

NOI-based DSCR = annual NOI ÷ annual debt service

A result of 1.00 means the calculated NOI equals the debt service used in the formula. A result of 1.25 means calculated NOI is 125% of debt service. The ratio does not establish a 25% investment return or loan approval. Minimum ratios, expense adjustments, amortization, interest-only treatment, and other requirements vary by execution.

Residential-Style LTR DSCR Uses a Different Formula

For the supplied theLender fully amortizing long-term-rental DSCR guidance, the ratio is eligible gross monthly rent divided by monthly PITIA. PITIA means principal, interest, property taxes, homeowners insurance, and association dues when applicable. An eligible interest-only execution uses eligible gross monthly rent divided by monthly ITIA, which excludes principal during the interest-only period.

This residential-style qualification ratio is often described in conversation as a DSCR even though it does not begin with conventional NOI. Calling PITIA an operating expense or calling gross rent NOI combines two distinct concepts. Confirm the exact formula, eligible rent, appraisal requirements, and payment components before relying on a preliminary ratio.

For more detail on the current product framework, review the theLender LTR DSCR guide. Current approved product materials, state restrictions, underwriting, valuation, title, insurance, and final loan documents control.

Worked Example

Assume a property has $4,000 in monthly rent, $200 in vacancy and credit loss, $800 in operating expenses, $2,400 in monthly debt service, and $3,200 in monthly PITIA.

  • Effective monthly income: $4,000 − $200 = $3,800
  • Monthly NOI: $3,800 − $800 = $3,000
  • Annual NOI: $3,000 × 12 = $36,000
  • NOI-based DSCR: $3,000 ÷ $2,400 = 1.25
  • Supplied theLender LTR DSCR estimate: $4,000 ÷ $3,200 = 1.25

The ratios happen to match in this example because the selected inputs produce the same result. Change the expense or payment assumptions and they can diverge. That difference is why the first question should be which DSCR method applies.

Common NOI Calculation Mistakes

  • Subtracting debt service inside NOI: This counts financing costs twice when NOI is later divided by debt service.
  • Ignoring vacancy: A current lease does not eliminate turnover or collection risk from a property analysis.
  • Using optimistic rents: Support rent with leases, a rent roll, appraisal evidence, and permitted market data.
  • Omitting management and maintenance: Owner labor and delayed repairs do not make those economic costs disappear.
  • Mixing capital work with routine repairs: Track major improvements and replacement reserves separately.
  • Assuming one lender's formula is universal: Ask for the exact income, expense, and debt-service definitions used for the selected loan.

Documents to Gather Before Applying

  • Current leases and rent roll
  • Trailing operating statements when available
  • Property tax bills and insurance declarations or quotes
  • Management, utility, and service contracts
  • Repair history and replacement budget
  • Appraisal and market-rent documentation requested by the lender
  • Proposed loan amount, rate, amortization, and payment structure

Use the same assumptions when comparing written offers. A lower payment can raise a calculated DSCR. Points, lender charges, prepayment provisions, reserves, and recourse can change the total economics of the loan.

Use an insurance estimate in the operating budget

Insurance remains an important property expense even when a lender’s specific DSCR calculation does not use the same methodology as an investor’s NOI analysis. Before finalizing a rental-property budget, investors can use Steadily’s tool to estimate landlord insurance costs and then replace the estimate with an actual quote for the property.

Treat the estimate as a planning input, not a binder, policy, premium guarantee, or lending decision. The lender’s qualifying calculation and the investor’s operating budget should be reviewed separately.

Bottom Line

Calculate NOI by subtracting realistic vacancy and operating expenses from property income. Use that NOI for an NOI-based commercial DSCR. For the supplied theLender residential-style LTR DSCR execution, divide eligible gross rent by PITIA or, for an eligible interest-only structure, by ITIA. The calculator provides an educational comparison. The lender's documented formula and current underwriting determine the ratio used for qualification.