---
title: "Buy to Let and Commercial Mortgages Declined on Affordability"
description: "Buy to let and commercial mortgages declined on affordability: rent cover tests, stress rates, personal tax, top slicing, limited companies and business income."
url: "https://mortgagelane.com/insights/what-to-do-if-your-mortgage-is-declined-on-affordability"
site: "Mortgage Lane"
collection: "posts"
date: "2026-07-24"
author: "Joseph Lane"
category: "Guides"
reviewed: "2026-10-08"
reading_time: "11 min"
byline: "Joseph Lane"
author_credentials: "CeMAP · FCA authorised firm"
language: "en-GB"
robots: "index,follow"
---

# Buy to Let and Commercial Mortgages Declined on Affordability

Buy to let and commercial mortgages declined on affordability: rent cover tests, stress rates, personal tax, top slicing, limited companies and business income.

Why buy to let, semi-commercial and commercial lenders decline on affordability, how rent and business income are tested, and the routes that remain after a decline.

[Affordability](https://mortgagelane.com/definitions?term=affordability)

Lending and affordability

A measure of whether the borrower can pay the mortgage on time and keep paying it, after debts, bills and living costs, including if circumstances change.

[Read the full definition of Affordability](https://mortgagelane.com/definitions?term=affordability)

## Expert advice on buy to let and commercial affordability declines

Speak to a Mortgage Lane adviser about your options.

## In short

A buy to let or commercial mortgage declined on affordability has usually failed a different test from a home loan: the rent, or the business's profit, did not cover the payments at the lender's stressed rate. Lenders set their own rent cover ratios, stress rates and income rules, so a five-year fix, top slicing, a limited company purchase or another lender can change the answer.

**A buy to let or commercial mortgage declined on affordability is one lender's decision, and other lenders may see the same case differently.** Lenders assess rent, personal income and business profit in different ways, and the same property and borrower can produce very different maximum loans across the market. A decline based on rent cover, the stress rate, personal tax or the way the income was presented means the loan was unaffordable to that lender, on that model.

The first step is to find out why the case was declined, because the reason decides which lenders are worth approaching next. Reapplying to a similar lender without changing anything usually ends in a second decline.

Mortgage Lane works with landlords and business owners declined on affordability across buy to let, semi-commercial and commercial property finance. We identify what caused the decline and which lenders take a different approach. A home loan is assessed on income, commitments and household costs instead, and our page on a [mortgage declined on affordability](https://mortgagelane.com/mortgages/mortgage-declined-on-affordability) covers residential cases in full, with a calculator.

## What does it mean if a buy to let mortgage is declined on affordability?

**A buy to let mortgage declined on affordability means the lender was not satisfied that the rent, with any personal income it allows, would cover the mortgage payments at its stressed rate.** The decline usually traces to one of five causes:

- Rent below the cover the lender needs at its stress rate
- A higher-rate taxpayer buying in their own name, where the lender needs more rent for the same loan
- A property where the rent is low against the price, so the rent supports less of the loan
- Gearing across a portfolio of four or more mortgaged buy to let properties that the lender reads as too high
- Personal income the lender does not accept, or accepts only in part, to top up the rent

Two situations make a decline more likely: property where rents are low against prices, and borrowers who rely on personal income to make up the rent. A landlord buying a well-let property, with rent comfortably above the lender's cover and standard criteria, rarely fails by a wide margin, while one who tops up a low rent with employed, self-employed or pension income can fail with one lender and pass comfortably with another.

## Affordability on a residential mortgage, in brief

**On a home loan, [affordability](https://mortgagelane.com/definitions#def-affordability) is the lender's assessment of whether the borrower can meet the repayments consistently, taking account of their debts, bills and living expenses, and whether the payments stay manageable if rates rise.** The FCA's rules require the lender to take full account of income net of tax, committed expenditure and household costs, and to allow for likely interest rate rises ([FCA Handbook: MCOB 11.6](https://www.handbook.fca.org.uk/handbook/MCOB/11/6.html)). In our experience the standard income multiple is 5 times gross income after credit commitments, up to 6 times for professionals and specialist products. Our [residential mortgages](https://mortgagelane.com/mortgages/residential-property-mortgages) page covers home loans generally, and our page on a mortgage declined on affordability works through the residential assessment step by step.

Affordability rules protect borrowers as well as lenders. Falling behind on mortgage payments affects a credit file and can put the property at risk, so a lender that declines on affordability is applying a protection, not making an arbitrary judgement.

## How affordability is assessed on different mortgage types

**Each type of mortgage has its own way of calculating affordability, so a decline on one product tells you little about another.**

### Buy to let

[Buy to let mortgage](https://mortgagelane.com/mortgages/buy-to-let-mortgages) affordability is calculated mainly from the rental income of the property rather than the borrower's earnings. Under the [Prudential Regulation Authority](https://mortgagelane.com/definitions#def-prudential-regulation-authority)'s buy to let underwriting standards ([SS13/16](https://mortgagelane.com/definitions#def-supervisory-statement-ss13-16)), lenders test the expected rent against the monthly interest at a [stressed rate](https://mortgagelane.com/definitions#def-rental-stress-test), the [interest coverage ratio](https://mortgagelane.com/definitions#def-interest-coverage-ratio), and take account of the tax the landlord pays on the property. The PRA describes 125% as the industry standard minimum ratio. The PRA expects the stressed rate to allow for likely rate rises over at least five years, including a rise of at least 2 percentage points and a minimum rate of 5.5%, unless the rate is fixed or capped for five years or more ([Bank of England: SS13/16 buy to let underwriting standards](https://www.bankofengland.co.uk/prudential-regulation/publication/2016/underwriting-standards-for-buy-to-let-mortgage-contracts-ss)). A buy to let mortgage on a property let to tenants is generally outside the FCA's mortgage rules. A buy to let application can also be declined for reasons unconnected to income, such as the property being close to commercial premises the lender will not accept, which our guide to a [declined mortgage near commercial premises](https://mortgagelane.com/guides/declined-mortgages/near-commercial) covers. In our experience most lenders no longer set a £25,000 minimum income: the majority only need evidence of some level of personal income, and the minority that still set a minimum apply their own figure.

### Expat and foreign national buy to let

Buy to let lenders assess applications for [expat mortgages](https://mortgagelane.com/specialists/expat-mortgages) and [mortgages for foreign nationals](https://mortgagelane.com/specialists/mortgages-for-foreign-nationals) on the rental income of the security property, meaning the property being bought or remortgaged. In our experience, buying in your own name can mean a higher rent cover test, at 145% for a higher-rate taxpayer against 125% for a basic-rate taxpayer. Buying through a limited company is generally tested at 125%, which can support a larger loan, and our page on [SPV mortgage rates](https://mortgagelane.com/insights/spv-mortgage-rates) covers company purchases.

### Semi-commercial

[Semi-commercial mortgage](https://mortgagelane.com/mortgages/semi-commercial-mortgage) affordability varies with home ownership, income, the strength of the lease covenant and how long commercial tenants have been in place. Some lenders will use residential income towards affordability. Others will not use the commercial rental element, which can make the target loan size harder to reach. Our page on a [mortgage for a flat above a shop](https://mortgagelane.com/mortgages/flat-above-shop-mortgages) covers a home or a let flat above commercial premises.

### Commercial

For investors, [commercial mortgage](https://mortgagelane.com/mortgages/commercial-mortgages) lenders use the lease income of the security property. For business owners, lenders use the net profit of the occupying business, calculated on an [EBITDA](https://mortgagelane.com/definitions#def-ebitda) basis, which may add back or deduct items from the accounts that will change on completion, for example swapping existing rent for the new mortgage payment. Most commercial lending is outside the FCA's mortgage rules.

### Sharia buy to let

[Sharia buy to let mortgage](https://mortgagelane.com/insights/sharia-buy-to-let-mortgages) affordability is calculated from received rental income on a refinance, or projected rental income on a purchase, and is assessed the same way as a conventional buy to let mortgage. Some Sharia-compliant lenders take a more flexible view on blocks of flats (MUFBs) and houses in multiple occupation (HMOs).

## What to do if a buy to let or commercial mortgage is declined on affordability

**After an affordability decline there are four routes, and the one to take depends on why the lender declined.**

### 1. Establish the actual reason

Lenders decline on affordability for different reasons, and each needs its own fix. Rent the valuer did not support, a personal tax position that raised the cover needed and a stress rate applied at a high level are separate problems, so establish which one applied before approaching another lender.

### 2. Move to a lender with a different rent or income policy

Lenders differ on the rent cover they need, on how they allow for the landlord's tax and on which personal income they count. Specialist lenders often apply more flexible criteria to the same rent and income, which can support a larger loan in the same circumstances. [Portfolio landlords](https://mortgagelane.com/definitions#def-portfolio-landlord), with four or more mortgaged buy to let properties, are assessed across the whole portfolio, and our page on [portfolio mortgages](https://mortgagelane.com/mortgages/property-portfolio-mortgages) covers that test.

### 3. Move to a lender with a lower stress rate

A buy to let stress test measures the rent against the mortgage interest at an assumed interest rate. Borrowing capacity moves with that assumed rate, so a lender applying a lower stress rate will lend more against the same rent. In our experience a two-year fix is typically stressed at 5.5% and a five-year fix at 4.5%. A rate fixed for five years or more sits outside the PRA's five-year rate rise test and its 5.5% minimum, which is why it can be tested lower. This is one of the most common reasons a buy to let case declined by one lender completes with another.

### 4. Consider top slicing

**[Top slicing](https://mortgagelane.com/definitions#def-top-slicing) allows a borrower to use personal disposable income to bridge the gap between the rental income and the lender's stress test requirement.** The PRA expects a lender that does this to carry out a detailed affordability assessment of the borrower, using personal income net of income tax and National Insurance. Top slicing can take a buy to let borrower to the target loan size where the rental income alone does not support it, and our guide to [top slicing mortgages](https://mortgagelane.com/guides/buy-to-let-mortgages/top-slicing-mortgages) explains how lenders apply it.

### Bridging finance as an interim option

**A [bridging loan](https://mortgagelane.com/definitions#def-bridging-loan) is short-term finance used to access funds in the interim while longer-term funding or an expected receipt is arranged.** Borrowers use bridging where speed matters or where a standard affordability calculation does not capture a significant part of their position. Our [bridging loans](https://mortgagelane.com/short-term-finance/bridging-loans) page covers how it works.

Bridging finance is short-term borrowing repaid by a defined exit, with its own costs and risks. It is not a cheaper alternative to a mortgage, and it is appropriate only where there is a clear and evidenced route to repay it.

## Related mortgage insights and guides

- [2026](https://mortgagelane.com/insights/commercial-buy-to-let-mortgages)Insight[Commercial Buy to Let Mortgages](https://mortgagelane.com/insights/commercial-buy-to-let-mortgages)Commercial buy to let mortgage advice from expert brokers. Suitable for HMOs, serviced accommodation and semi commercial property.[Read more about Commercial Buy to Let Mortgages](https://mortgagelane.com/insights/commercial-buy-to-let-mortgages)
- [2026](https://mortgagelane.com/guides/insights-commercial-buy-to-let-mortgages-details)Guide[Commercial Buy to Let Mortgages: detailed guide](https://mortgagelane.com/guides/insights-commercial-buy-to-let-mortgages-details)Detailed explanations and criteria for Commercial Buy to Let Mortgages.[Read more about Commercial Buy to Let Mortgages: detailed guide](https://mortgagelane.com/guides/insights-commercial-buy-to-let-mortgages-details)
- [2026](https://mortgagelane.com/mortgages/buy-to-let-mortgages)Mortgage[Buy to Let Mortgages](https://mortgagelane.com/mortgages/buy-to-let-mortgages)We assist borrowers with market leading buy to let mortgages and can assist on complex property and tenant types.[Read more about Buy to Let Mortgages](https://mortgagelane.com/mortgages/buy-to-let-mortgages)

## Common questions

**Q: How is affordability calculated on a buy-to-let mortgage?**

faq-id: how-is-affordability-calculated-on-a-buy-to-let-mortgage

Buy-to-let affordability is calculated from the rental income the property generates rather than the borrower's earnings, assessed against a stress test set by the lender.

**Q: What is a buy-to-let stress test?**

faq-id: what-is-a-buy-to-let-stress-test

A buy-to-let stress test measures whether the rental income covers the mortgage payment at an assumed interest rate. Because borrowing capacity moves with that assumed rate, a lender applying a lower stress rate will lend more against the same rent.

**Q: What is top slicing on a buy-to-let mortgage?**

faq-id: what-is-top-slicing-on-a-buy-to-let-mortgage

Top slicing is when a lender uses part of the borrower's personal income to cover a shortfall where the rent alone does not pass the rental stress test. The PRA allows it only with a detailed affordability assessment of the borrower's income after tax, credit commitments, essential spending and living costs ([Bank of England: SS13/16](https://www.bankofengland.co.uk/prudential-regulation/publication/2016/underwriting-standards-for-buy-to-let-mortgage-contracts-ss)). Not all lenders offer it, and those that do set their own minimum income and their own limit on how much of the loan personal income can support. It can help a higher-rate taxpayer whose rent narrowly fails a 145% test, or a property where rents are low compared with the price.

**Q: Is a limited company buy-to-let stressed differently to a personal purchase?**

faq-id: is-a-limited-company-buy-to-let-stressed-differently-to-a-personal-purchase

Yes. A personal purchase by a higher-rate taxpayer is generally stressed at 145%, while a limited company purchase is generally stressed at 125%, which can support a larger loan on the same rent.

**Q: Is there a minimum income for a buy-to-let mortgage?**

faq-id: is-there-a-minimum-income-for-a-buy-to-let-mortgage

Most lenders no longer set a £25,000 minimum income on buy-to-let applications. The majority only require evidence of some level of personal income, and the minority that still set a minimum apply their own figure.

**Q: How is affordability assessed on a commercial mortgage?**

faq-id: how-is-affordability-assessed-on-a-commercial-mortgage

For investors, commercial lenders assess the lease income of the security property. For business owners, lenders assess the net profit of the occupying business on an EBITDA basis, adjusting for items that will change on completion.

**Q: How is affordability calculated on a residential mortgage?**

faq-id: how-is-affordability-calculated-on-a-residential-mortgage

A lender calculates residential affordability by checking that your income, after credit commitments and household costs, covers the mortgage payment, including at a higher rate allowing for likely rate rises. The FCA's rules require it to take full account of your income net of income tax and National Insurance, your committed expenditure and the basic essential and quality-of-living costs of your household ([FCA Handbook: MCOB 11.6.5R](https://www.handbook.fca.org.uk/handbook/MCOB/11/6.html)). Each lender sets its own rules on which income it counts. Lenders also cap the loan at a multiple of income: in our experience 5 times gross income after credit commitments as standard, and up to 6 times for professionals and specialist products. The multiple caps the loan, and the affordability assessment decides whether you can borrow that much.

**Q: Does a declined mortgage application affect my credit file?**

faq-id: does-a-declined-mortgage-application-affect-my-credit-file

A mortgage application involves a credit search, and repeated applications in a short period are visible to subsequent lenders. This is why establishing the reason for a decline before reapplying matters.

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Published: 2026-07-24

Last reviewed: 2026-10-08

Source: https://mortgagelane.com/insights/what-to-do-if-your-mortgage-is-declined-on-affordability