If your overpayment goes to reduce next month's payment, it just means you're paying slightly early, so you save a few days' interest, but not much. You'd still repay almost as much as you would sticking to contractual payments, and – crucially – you won't have reduced your mortgage term.
Overpaying your mortgage doesn't automatically reduce the term of your mortgage.
There's a process to getting the mortgage payoff statement. First, you'll need to contact your lender and let them know you want the information. Depending on your lender, you may have to sign in to an online account, call a helpline, or send a formal letter to start the request process.
2% of your repayment. Let's say you're paying on a weekly or monthly basis. Let's say monthly basis you're paying roughly $2000. If you add extra 2% under $2000, that 2% extra can save you 14 to 15 years on interest.