Selected five-year fixed rate purchase and remortgage rates up to 85% LTV will see reductions of 0.10%.
Additionally, three-year fixed rate remortgage products up to 75% LTV have been reduced by 0.05%.
Five-year fixed rate purchase products now start from 1.84% at 60% LTV, 1.89% up to 75% LTV and 2.04% at 80-85% LTV.
Three-year fixed rate remortgages start from 1.69% with a £995 fee or 1.99% fee-free up to 60% LTV, and 1.74% or 2.04% fee-free up to 75% LTV.
Nick Smith, head of mortgages at TSB, said: “At TSB we want to help more people to borrow well and these changes are an example of us doing exactly that.
"The interest rate reductions on our fixed rate products are a welcome step for those looking to fix their monthly payments for a longer period of time, with the added bonus of free legals or £300 cashback.”