“Does anyone still deduct mortgage interest? “
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I do.
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Tricks such as twice monthly payments (splitting your mortgage payment in half, making two payments a month) helps accelerate payoff and saves you money. So does making one extra payment a year, provided you direct that payment to cover principal with your mortgage holder.
On a typical 30 year mortgage, making one extra payment a year (directed towards principal) cuts the mortgage term to 21 years until pay-off.