YBS is offering borrowers two three-year drop-lock deals direct only.
The trackers have rates of 2.29% (Bank base rate+ 1.79%), with a product fee of £995, and 2.49% (Bank base rate +1.99%) with fees of £95 and £500 cashback.
Both mortgages are available up to £75% LTV.
Borrowers can choose to transfer at any time during the deal period to the fee-free fixed rate products available for YBS’ existing borrowers without incurring an early repayment charge.
Chris Smith, group direct product manager at YBS, said: “If a customer is undecided between a tracker rate and a fixed rate mortgage, this new drop-lock option gives them much more freedom when choosing a mortgage.”