how about posting some simple numbers, eg % of a 25 year repayment mortgage outstanding at 5, 10, 15 and 20 years for an assumed interest rate.
Just use the MoneySavingExpert calculator:
http://www.moneysavingexpert.com/mortgages/mortgage-overpayment-calculator
Here’s an example:
On £250,000 over 25 years at 4.9%:
Year Normal Overpay £250
Year Normal Overpay £250
0 250,000 250,000
1 244,845 241,763
2 239,427 233,104
3 233,731 224,002
4 227,744 214,435
5 221,450 204,378
6 214,835 193,807
7 207,881 182,695
8 200,572 171,014
9 192,888 158,735
10 184,811 145,829
11 176,321 132,262
12 167,397 118,001
13 158,016 103,010
14 148,155 87,253
15 137,790 70,689
16 126,894 53,278
17 115,441 34,976
18 103,402 15,738
19 90,747 0
20 77,445 0
21 63,462 0
22 48,763 0
23 33,313 0
24 17,072 0
25 0 0
Overpaying would save you £52,693 in interest, and mean you pay it off in full 6 years and 3 months earlier.
Edit: mudshark you’ve broke the forum with you’re cleverness 😕