There is no universal answer to this question, as every application is different. There are many factors why your buy-to-let mortgage application might be rejected. One of the reasons could be that you’ve reached your borrowing limit and lenders don’t deem it affordable for you to borrow more. If you’re taking out more than one mortgage at a time, your lender may also have a limit on how many deals they can offer you at once. Ultimately, lenders are unlikely to allow you to borrow what they deem as ‘too much’, as they may be concerned that you will struggle to repay your debt. What’s more, lenders may want to make sure that your rental income will be about 20%–30% more than your mortgage. If your projected rental earnings are lower than that, then lenders may reject your application. Another reason for which your buy-to-let application might be declined is if you already own several properties for rent. Specifically, this could be seen as an issue if your existing mortgages have high loan-to-value (LTV) ratios. This is because you already owe lenders a significant amount of money.