Extra mortgage payments.

[Joseph A Michel]

My team and I refinanced on our duplex last year to take cash out for a downpayment on another property. We may want to do the same thing again in a few years depending on what interest rates look at the time.  If we make a couple additional mortgage payments each year, will that lower the amount of interest we pay overall even if we refinance 5 years down the road, helping us build more equity in the property besides the dollar amount taken off the loan from the extra payments?