Legal & General Mortgage Club has updated its buy-to-let index after the Prudential Regulation Authority introduced stress tests in January.
Lenders now have to stress test mortgages against a rate of 5.5% for mortgages under five years.
Most lenders have raised interest coverage ratios as a result of the change and the reduction in mortgage tax relief from April.
Jeremy Duncombe, director of Legal & General Mortgage Club, said: “There have been several major changes within the buy-to-let market during the past 12 months, with the most recent being the Prudential Regulation Authority’s new affordability calculations at the start of the year.
“Our buy-to-let matrix has now been updated to include these latest PRA changes, allowing brokers to familiarise and prepare themselves with the new rental calculations.
“Our latest update has all of the information that advisers will need to understand these changes and give their clients the best advice possible, based on the latest, most up-to-date data.”