You have no idea what you're talking about. They payment differences are huge. For example on a $250k loan at 4% the payments over 30 years are $550 per fortnight, where over 15 years it's $850 per fortnight. That's a fucking huge difference to most people.
But interest rates are different for a 15 year and a 30 year. It's about 3% for a 15 year, 3.8% for a 30 year in the US.
So a $160,000 mortgage at 3% for 15 years is $1104.93/month. Over 15 years you will pay $38887.51 in interest
A $160,000 mortgage at 3.8% for 30 years is $745.53/month. Over 30 years you will pay $108391.43 in interest.
If you pay extra on your 30 year and pay it off in 15 years, you would have to pay $1167.53 a month and spend a total of $50155.19 in interest.
So the cost of having the cushion ($1104.93-$745.53=$359.4 a month) that the 30 year provides is about $750/year for 15 years.
If you know that you can make the payments for a 15 year then you can save $750/year
