Underwriting Benchmark · Financial Tool

Commercial Real Estate Debt Service Coverage Ratio (DSCR) Calculator

The Debt Service Coverage Ratio (DSCR) is the foundational metric commercial lenders use to measure a property’s ability to cover its annual mortgage obligations from in-place net operating income (NOI).

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Standard Default Parameters

Gross Annual Rental Income ($) $850,000

Annual Operating Expenses ($) $323,000

Proposed Annual Debt Service ($) $400,000

Lender Target DSCR (e.g. 1.25x) 1.25x

Underwritten Results Preview

Underwritten In-Place DSCR Calculated Live

Net Operating Income (NOI) Calculated Live

Max Allowable Debt Service Calculated Live

Annual Cash Cushion Calculated Live

Interactive real-time sliders and calculation engine enabled on live page.

Debt Service Coverage Ratio (DSCR) Formula

DSCR = Net Operating Income (NOI) / Annual Debt Service

Net Operating Income is Effective Gross Income minus all property operating expenses, property management fees, and replacement reserves. DSCR represents the cash flow buffer available to service mortgage debt.

Formula Components

NOI Net Operating Income after vacancy loss, operating expenses, and replacement reserves.

ADS Annual Debt Service (Total 12 months of principal and interest payments).

Target DSCR Lender minimum coverage requirement (typically 1.20x to 1.35x).

Max Supported Loan Maximum debt sizing that maintains the target coverage threshold.

Real-World Case Study

24-Unit Multifamily Apartment Community

A sponsor requests a $5,000,000 refinancing on a stabilized apartment building generating $850,000 gross annual rent with a 38% operating expense ratio.

Inputs

Gross Annual Revenue $850,000

Operating Expenses $323,000 (38%)

Net Operating Income (NOI) $527,000

Proposed Annual Debt Service $400,000

Lender Minimum DSCR 1.25x

Sizing Outcomes

In-Place DSCR 1.32x

Target DSCR Test PASSED (0.07x Buffer)

Max Allowable Debt Service $421,600

Annual Cash Cushion $27,000

Underwriter Takeaway: The property exceeds the 1.25x DSCR hurdle with a 1.32x coverage ratio, demonstrating sufficient income stability to support the requested $5M capital stack.

Underwriting Limitations & Disclosures

Lenders standardize operating expenses by adding replacement reserves ($250-$350/unit) and underwriting administrative management fees (typically 3% to 5%) even if self-managed.
Underwritten vacancy is capped at a market floor (usually minimum 5% to 10%) regardless of zero historical vacancy.
All calculated figures are provided for educational and deal screening purposes. Actual lender term sheets depend on full underwriting review.

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Frequently Answered Financing Questions

Verified answers to common borrower and broker inquiries regarding loan sizing, guidelines, and execution.

Underwriting Q&A

What is a good DSCR ratio for commercial real estate financing?

Most commercial lenders require a minimum DSCR of 1.20x to 1.25x for stabilized multifamily and industrial properties, and 1.30x to 1.40x for retail, office, and hospitality assets.

A 1.25x DSCR indicates the property produces $1.25 in net operating cash flow for every $1.00 of required debt service, providing a 20% safety margin against tenant vacancies and rising costs.

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Underwriting Q&A

How does Net Operating Income (NOI) normalization affect commercial loan DSCR?

Lenders normalize borrower-provided P&Ls by inserting normalized property management fees, replacement reserve allowances, and adjusting real estate taxes for post-sale reassessment.

This normalized NOI is almost always lower than unadjusted tax return numbers, which directly reduces maximum borrowing capacity under DSCR tests.

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