How Do Lenders Treat Rental Income for Remortgage Purposes?
The way lenders assess rental income when you apply to remortgage depends primarily on whether you are remortgaging a residential property or a buy-to-let property, and what type of rental income you are receiving. Understanding these distinctions is critical for knowing how much your rental income can boost your borrowing capacity.
Buy-to-let remortgages. If you are remortgaging a buy-to-let property, the rental income from that specific property is the primary factor in the affordability assessment. Most buy-to-let lenders use a rental coverage ratio, typically requiring the monthly rent to be at least 125 to 145 per cent of the monthly mortgage payment at a stressed interest rate. The stressed rate is usually between 5 and 5.5 per cent, though this varies by lender.
Residential remortgages with additional rental income. If you are remortgaging your own home and have rental income from other properties, most lenders will consider this as supplementary income alongside your employment or self-employment earnings. However, they may not include the full rental amount. Many lenders apply a haircut, typically using only 75 to 80 per cent of the gross rental income, to account for potential void periods, maintenance costs and other expenses.
Lodger income. If you have a lodger living in your home and paying you rent, some lenders will consider this income in their affordability assessment, though not all lenders accept it. Those that do will usually require evidence that the lodger arrangement has been in place for a minimum period and may only include a portion of the lodger payments in their calculations.
Rent a Room scheme income. The government Rent a Room scheme allows you to earn up to a specified tax-free threshold per year from letting a furnished room in your home. Some lenders will consider this income, particularly if it has been received consistently over a period of time. However, acceptance varies widely between lenders.
Regardless of the type of rental income, lenders want to see evidence that the income is genuine, sustainable and properly declared for tax purposes. Undeclared rental income cannot be used in a mortgage application, and attempting to use undisclosed income could constitute mortgage fraud.
Remortgaging a Buy-to-Let Property With Rental Income
Buy-to-let remortgages are assessed quite differently from residential remortgages, with the rental income from the property being the central factor in the lending decision. Understanding how buy-to-let affordability works can help you secure the best deal for your investment property.
The key metric for buy-to-let remortgages is the interest coverage ratio, also known as the rental coverage ratio. This measures whether the rental income from the property is sufficient to cover the mortgage payments with a comfortable margin. Most lenders require the rent to cover between 125 and 145 per cent of the monthly mortgage payment, calculated at a stressed interest rate rather than the actual rate you will pay.
For example, if the stressed monthly mortgage payment would be 1,000 pounds, a lender requiring 145 per cent coverage would need you to demonstrate monthly rental income of at least 1,450 pounds. The stressed rate used for this calculation is typically between 5 and 5.5 per cent, regardless of the actual mortgage rate offered.
Some lenders apply different stress tests depending on your personal tax position. Higher-rate and additional-rate taxpayers may face a higher rental coverage requirement because the phasing out of mortgage interest tax relief means their net income from the property is lower. This can affect the maximum amount you are able to borrow.
In addition to the rental coverage assessment, many buy-to-let lenders also require a minimum personal income, often around 25,000 pounds per year, from sources other than the rental property. This requirement exists to ensure that the borrower has sufficient means to cover mortgage payments during any void periods when the property is not tenanted.
The loan-to-value ratio for buy-to-let remortgages is also a key factor. Most buy-to-let lenders offer products up to 75 per cent LTV, with some going up to 80 or even 85 per cent, though higher LTV products will typically carry higher interest rates and stricter rental coverage requirements.
If you have a portfolio of buy-to-let properties, some lenders may assess the overall portfolio income and debt rather than looking at each property in isolation. Portfolio landlord assessment criteria vary significantly between lenders, so specialist advice is particularly valuable if you own four or more mortgaged rental properties.
Using Rental Income to Boost a Residential Remortgage
If you are remortgaging your own home and have rental income from other properties, this additional income can potentially increase the amount you are able to borrow. However, the way lenders incorporate rental income into a residential remortgage assessment varies and it is important to understand the approach different lenders take.
Most mainstream lenders will consider rental income from other properties as supplementary income alongside your primary employment or self-employment earnings. They will typically apply a discount to the gross rental figure, often using only 75 to 80 per cent of the gross rent, to account for void periods, maintenance costs, letting agent fees and other expenses associated with being a landlord.
For example, if you receive 1,200 pounds per month in gross rental income from a buy-to-let property, a lender applying a 25 per cent discount would consider only 900 pounds per month, or 10,800 pounds per year, as usable income for your residential remortgage affordability calculation.
Some lenders go further and will only consider rental income that is net of all costs, including the mortgage payments on the rental property. If you are paying a monthly mortgage of 800 pounds on a rental property that generates 1,200 pounds in rent, some lenders would only add 400 pounds per month to your income assessment, while others would use the full discounted rental figure without deducting the buy-to-let mortgage payment.
The documentation required to evidence rental income typically includes a tenancy agreement showing the current rent, bank statements showing rental payments received, your most recent tax return showing the rental income declared, and details of any mortgage on the rental property. Some lenders may also want a professional rental valuation to verify that the rent being charged is in line with market rates.
If you are relying on rental income to meet the affordability criteria for your residential remortgage, it is particularly important to choose a lender whose income assessment methodology works in your favour. This is one of the areas where a specialist broker can add significant value by matching you with the right lender.