While it is not advised, it is generally still possible to break your agreement with your lender and end your fixed rate period. This will incur what is called a ‘break cost’, which compensates lenders for the extra costs taken on by them to fund your loan and then terminating it early. You should make sure that you are aware of your break cost before making your decision about exiting your loan, as in some cases you might find that it is actually cheaper to simply pay out your loan as usual rather than take on this extra cost.