Commercial mortgage borrowing is not usually based on one simple income multiple. Lenders look at the property, deposit or equity, business income or rent, credit profile, sector risk and repayment route before deciding what loan size is realistic.
This guide explains how UK commercial mortgage borrowing is commonly assessed. It is not a lender decision, mortgage offer or guarantee of acceptance.
What decides how much you can borrow?
The amount you can borrow on a commercial mortgage is usually shaped by two questions: how much security the property gives the lender, and whether the borrower can realistically support the repayments. A strong property with weak income may still be difficult. A profitable business with a complicated property may also need more preparation before a lender will commit.
For many enquiries, the starting point is the property value and the deposit or equity available. Straightforward commercial cases are often discussed as a percentage of value, but the lender will still test affordability, credit profile, sector, lease terms, valuation and the purpose of funds. This is why two borrowers looking at the same purchase price can receive very different answers.
Borrowing the full purchase price does not remove affordability or security checks. See what a 100% commercial mortgage usually requires.
Property value and deposit
The loan is secured against the property, so valuation, condition, use, tenure and loan-to-value matter from the start.
Business or rental income
Owner-occupied cases depend on business affordability. Investment cases depend heavily on rent, lease strength and tenant quality.
Risk and evidence
Trading history, accounts, bank conduct, credit profile, sector, experience and timescale can raise or lower lender appetite.
If your business will trade from the property
An owner-occupied commercial mortgage is usually assessed around the business that will use the premises. The lender wants to know whether the business can afford the mortgage alongside wages, suppliers, tax, rent history, existing loans and normal operating costs.
Accounts are important, but lenders may also look beyond the last filed figures. They may ask for management accounts, bank statements, forecasts, VAT returns, accountant comments or evidence that the new premises will improve the business. If the business is growing, has seasonal income or recently changed structure, the explanation matters.
Borrowing may be stronger where the business has stable trading, healthy cashflow, a clear reason for buying, suitable deposit, clean bank conduct and evidence that monthly repayments remain comfortable if costs rise. It may be weaker where profits are thin, accounts are outdated, income is irregular or existing commitments are already high.
If the property will be let to tenants
For a commercial investment mortgage, the rent and lease position become central. Lenders usually want to understand who the tenant is, how long the lease has left, whether the rent is sustainable, whether there are break clauses, and how easily the property could be re-let if the tenant leaves.
Rental income is not assessed in isolation. A lender may stress the rent against an assumed interest rate, repayment structure or interest cover requirement. A strong tenant on a long lease can help, while vacant units, short leases, weak tenant covenants or unusual property types can reduce the maximum loan.
If you already own the commercial property
For a commercial remortgage, the lender usually starts with the current value, existing mortgage balance and reason for refinancing. If you are only replacing an existing facility, the borrowing question may be about affordability, rate, term and whether the new lender is comfortable with the property. If you are raising extra capital, the lender will also want to understand the purpose of the funds and whether the larger loan remains affordable.
Capital raising can be considered for business investment, property improvement, debt restructuring, purchasing another property or replacing short-term finance. It is not assessed automatically just because equity exists. Lenders may ask why the money is needed, how it improves the position, whether the business can support the higher repayment and whether the property valuation justifies the increased loan.
Current balance
The outstanding mortgage, repayment history and any early repayment charges affect whether refinancing is worthwhile.
Available equity
Equity can support extra borrowing, but valuation, income and lender appetite still decide the final loan amount.
Purpose of funds
A clear business or property purpose is stronger than a vague request to release cash without an exit or repayment plan.
What can reduce the amount a lender will offer?
Borrowers often focus on the maximum loan-to-value, but the final borrowing figure can be reduced by affordability, valuation, legal issues or lender appetite. A lender may like the borrower but not the property. Another lender may like the property but need a lower loan because the rent or accounts do not support the debt.
Valuation below expectation
If the lender valuation is lower than the purchase price or borrower estimate, the loan may be based on the lower figure.
Short or unstable income
Thin profits, irregular rent, short leases, recent trading losses or weak bank conduct can limit the loan size.
Property or sector risk
Unusual construction, poor condition, specialist use, vacancy risk or planning concerns can reduce lender appetite.
Credit profile
Recent adverse credit, missed payments, high unsecured borrowing or unresolved company debts can reduce available options.
Repayment term
A shorter term can increase monthly repayments and reduce affordability. A longer term may help cashflow but can increase total interest.
Purpose of funds
Buying premises, refinancing, raising capital, buying investment property or exiting bridging finance may each be assessed differently.
How to improve your commercial mortgage borrowing position
You cannot force a lender to offer a larger loan, but you can make the case easier to assess. The strongest enquiries usually explain the borrower, property, numbers and timescale clearly before valuation or legal costs are incurred.
Before applying, compare this guide with the commercial mortgage eligibility criteria, the document checklist and the application process. These pages help turn a borrowing question into an enquiry a lender can assess properly.
Why an online figure is only a starting point
A calculator can show what a loan might cost each month. It cannot fully judge lender appetite, valuation risk, lease terms, company structure, credit issues, trading strength or whether a different finance route would be more suitable.
Your likely loan must pass both security and repayment tests
A practical way to understand commercial mortgage borrowing is to think about two ceilings. The first is how much the lender is prepared to advance against the accepted property value. The second is how much the business cash flow or sustainable net rent can support under that lender’s repayment assumptions. The lower workable figure usually constrains the case.
Owner-occupied: cash available for debt service
The British Business Bank explains that cash flow available for debt servicing (CFADS) looks at cash remaining after operating expenses, tax, capital expenditure and working-capital changes. It can therefore give a more complete debt-affordability view than EBITDA alone.
Investment: sustainable net rental cover
Rental-cover requirements are lender and product specific. Lloyds’ published term-lending guide includes route-specific real-estate criteria covering matters such as interest cover, loan-to-value, term and loan size. Those criteria apply only to the stated Lloyds route, can change and are not market-wide rules.
Evidence must reconcile
NatWest’s business-lending guidance says an application may be declined if the lender believes the repayments are unaffordable or declared income does not match the evidence it sees. Accounts, management figures and bank conduct need to tell a coherent story.
Last reviewed: 12 August 2026. Lender products, affordability calculations and rental-cover requirements can change. Count Ready is a credit broker, not a lender; this guide is general information and not a mortgage offer or promise of acceptance.
Check what you may be able to borrow
Tell us whether the property is for your own business or an investment, its value or purchase price, the loan required, deposit or equity, trading income or rent, existing borrowing and target date. Add those figures in the “Commercial borrowing details” box. We will sense-check the security and repayment-capacity ceilings and explain which evidence or case changes may affect the amount.
Your information is used to respond to this enquiry. Submitting the form does not commit you to an application and does not guarantee that a lender will accept the case.
Commercial mortgage borrowing questions
How much can I borrow on a commercial mortgage?
There is no single income multiple for commercial mortgages. The amount you may be able to borrow depends on the property value, deposit or equity, business affordability or rental income, credit profile, sector, repayment term, lender appetite and valuation.
What loan-to-value can I get on a commercial mortgage?
Many commercial mortgage cases are assessed around the deposit or equity available, but maximum loan-to-value varies by lender, property type and risk. Strong owner-occupied cases may be treated differently from investment, semi-commercial or specialist properties.
Is commercial mortgage borrowing based on business profit?
For owner-occupied commercial mortgages, lenders usually review business performance, accounts, cashflow, bank conduct and existing commitments to judge whether the business can afford the repayments.
How do lenders assess investment commercial property borrowing?
For investment commercial mortgages, lenders usually look at rental income, lease terms, tenant strength, property quality, interest cover, loan-to-value and the landlord or company profile.
Can I borrow more if I have a bigger deposit?
A larger deposit or more equity can improve the case because it lowers the lender risk. It does not guarantee a larger loan, because affordability, valuation, property type and credit profile still matter.
Can adverse credit reduce commercial mortgage borrowing?
Yes. Recent or serious credit issues can reduce lender choice, lower the maximum loan-to-value or increase the evidence required. Some lenders may still consider a case if the security, income and explanation are strong.
What documents help confirm commercial mortgage borrowing?
Useful documents include recent accounts, management figures, bank statements, lease or rental details, property information, existing mortgage statements, proof of deposit or equity and a clear explanation of the loan purpose.