New affordability rules from 1 Jan 2017, mean Landlords will have limits on the amount they can borrow on a buy to let mortgage. For a short transitional period, it is still possible to take out a mortgage under the old rules, however borrowing more now may limit remortgaging options later on after rules change. Less stringent limits are in place for buy to let mortgages fixed for five years or more, or landlords who own property in limited companies.

Buy-to-let crackdown: Where can you still get the biggest mortgages? – Telegraph.co.uk