Commercial Mortgage Affordability Explained
Commercial mortgage affordability is assessed differently to residential lending.
Rather than focusing solely on personal income, lenders base affordability primarily on the income generated by the property, the structure of the lease, and how comfortably that income covers the proposed loan repayments.
At Wellspring Capital, affordability is assessed early to ensure lender alignment before capital is committed.
How Commercial Mortgage Affordability Is Assessed
Commercial mortgage lenders typically assess affordability using a rental coverage calculation rather than a borrower’s salary.
The objective is to ensure the property’s income can comfortably service the loan, even if interest rates rise or occupancy changes.
Affordability is usually assessed alongside:
• Asset type and location
• Lease length and tenant strength
• Loan structure and repayment profile
• The borrower’s experience and ownership structure
Rental Coverage and Income Cover
Most commercial lenders require the property’s net rental income to exceed the loan repayments by a set margin.
This margin is commonly expressed as a coverage ratio.
While requirements vary by lender and asset type, coverage thresholds may be higher for:
• Secondary retail
• Short leases
• Specialist or leisure assets
• Higher leverage structures
Stronger assets, longer leases, and higher-quality tenants can allow for more flexible affordability treatment.
What Income Lenders Use for Affordability
Lenders assess affordability using income that is sustainable and contractually supported.
This may include:
• Contracted passing rent
• Reversionary rent where evidence supports it
• Blended income for mixed-use assets
• Stabilised income for assets transitioning from short-term finance
Income that is speculative, unproven, or unsupported by leases is typically discounted or excluded from affordability calculations.
For a broader overview of commercial mortgage structures, lender criteria, and common asset types, see our guide to commercial mortgages.
What is a DSCR Loan?
A DSCR loan — or Debt Service Coverage Ratio loan — is a commercial mortgage assessed primarily on the rental income generated by the property rather than the borrower’s personal income or salary.
Lenders calculate the DSCR by dividing the property’s annual net rental income by the annual loan repayments. For example, if a property generates £50,000 per year in rent and the annual loan repayment is £40,000, the DSCR is 1.25 or 125%.
Most UK commercial mortgage lenders require a minimum DSCR of 125%–145%, though this varies by lender, asset type, and lease structure. Higher ratios may be required for secondary retail, short leases, or specialist assets.
DSCR calculations can be applied to both interest only and capital repayment loans, though lenders will assess coverage differently depending on the repayment structure chosen. Interest only loans typically produce a higher DSCR as monthly payments are lower, which can allow for greater leverage in some cases.
DSCR lending is commonly used for commercial investment property, mixed-use buildings, and multi-unit freehold blocks where rental income is the primary basis for affordability assessment.
For more information on how commercial lenders assess your property, speak with Wellspring Capital.