Okay... the math here disturbs me. Despite the fact of a 4% return being taxed, and the compound calculation equaling about $75k for the $500 a month saved, it is the actual net worth calculations that IR mentioned , that are way off. After 10 years, on a $400k loan, at 6.5% looks more like this...
Home value $500k
Minus $333.5k loan balance
Plus $75k saved
Equals a net worth of $241.5k
Home value $500k
Minus $252.1k loan balance
Equals a net worth of 247.9k
Wow, looks like the extra payment gets you a big $6400. Now, here is where it gets good, after 19 years, the extra payments mean there is no more loan. So, lets fast forward 19 years, and still save or pay an extra $500...
Home value $1mil
Minus $231.7k loan balance
Minus $420.8k interest paid
Plus $186.9 saved
Equals a net worth of $534.4k
Home value $1mil
Minus $304.6k interest paid
Equals a net worth of $695.4k
So... paying debt, not only makes your net worth $161k more, but you have no more mortgage payments. The saver would still have almost eleven more years of mortgage payments, and another $89.7k of interest.
<em>
No one ever got fabulously wealthy by paying off debt.
</em>Nope, but they sure as hell have a larger net worth than those who don't.