The lender said the move was temporary.
Meanwhile it has slashed the rate on its five-year fix by 0.10%.
It will now offer a five-year fixed rate at 60-75% loan-to-value at 1.79%. The product comes with a £995 fee.
Roland McCormack (pictured), mortgage distribution director for TSB, said the move will be a “welcome step” for those looking to fix their monthly payments for a longer period of time.
He added: “TSB is committed to helping people to borrow well and this rate reduction is an example of us doing exactly that.”