---
title: "How much commercial mortgage can i afford?"
description: "How much commercial mortgage you can afford is determined primarily by income sustainability and debt servicing capacity, not personal income multiples. Commercial lenders assess affordability using a cash-flow-led model, supported by property value and sector risk."
url: "https://mortgagelane.com/guides/commercial-mortgages/how-much-commercial-mortgage-can-i-afford"
site: "Mortgage Lane"
collection: "guides"
date: "2026-08-04"
author: "Written by an adviser at Mortgage Lane"
category: "Mortgage guide"
reviewed: "2026-08-04"
reading_time: "2 min"
byline: "Written by an adviser at Mortgage Lane"
author_credentials: "CeMAP · FCA authorised firm"
language: "en-GB"
robots: "index,follow"
---

# How much commercial mortgage can i afford?

How much commercial mortgage you can afford is determined primarily by income sustainability and debt servicing capacity, not personal income multiples. Commercial lenders assess affordability using a cash-flow-led model, supported by property value and sector risk.

How much commercial mortgage you can afford is determined primarily by income sustainability and debt servicing capacity, not personal income multiples. Commercial lenders assess affordability using a cash-flow-led model, supported by property value and sector risk.

[Commercial mortgage](https://mortgagelane.com/definitions?term=commercial-mortgage)

Commercial

An asset-backed loan secured against commercial, semi-commercial or large-scale investment property, assessed on income sustainability, asset risk and valuation methodology rather than personal affordability alone.

[Read the full definition of Commercial mortgage](https://mortgagelane.com/definitions?term=commercial-mortgage)

Back to overview

[Commercial Mortgages](https://mortgagelane.com/mortgages/commercial-mortgages)

Related definitions

[Commercial mortgage](https://mortgagelane.com/definitions#def-commercial-mortgage)

·

[Mortgage](https://mortgagelane.com/definitions#def-mortgage)

## How much commercial mortgage can i afford?

How much commercial mortgage you can afford is determined primarily by income sustainability and debt servicing capacity, not personal income multiples. Commercial lenders assess affordability using a cash-flow-led model, supported by property value and sector risk.

In practice, lenders calculate affordability by applying a Debt Service Coverage Ratio (DSCR), typically between 1.25x and 1.5x, to the net rental income (for investment property) or maintainable business profits (for owner-occupied or trading premises). This means the property or business must generate sufficient surplus income to comfortably cover loan repayments after stress testing interest rates. The final loan amount is then capped by the lower of affordability or loan-to-value (LTV), which usually ranges from 60% to 75%, depending on the sector, asset quality, and lender appetite.

In summary, your affordable commercial mortgage is driven by:

- Sustainable rental income or trading profits
- Lender stress-tested interest rates
- Required DSCR
- Maximum LTV for the property type

Even high-value properties will be limited if income cannot support the debt, while strong, stable income can materially increase borrowing capacity within lender risk limits.

## Talk it through with an adviser

Speak to a Mortgage Lane adviser about your circumstances and the next steps.

Published: 2026-08-04

Last reviewed: 2026-08-04

Source: https://mortgagelane.com/guides/commercial-mortgages/how-much-commercial-mortgage-can-i-afford