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What's the catch with biweekly mortgage payments?
Making extra principal payments will reduce the term of your loan. I wouldn't sign up for a biweekly schedule, just do it yourself so you have more flexibility. A simple spreadsheet will allow you to play "What if?" and make it clear that extra principal payments are most effective early in the term of the loan. My wife and I paid off our home in less than 10 years with this approach. Some will say that the opportunity costs of not using that money for something else outweighs the gains. I would say that not having a mortgage has a positive impact on your cash flow and your assets (you own the home), which combine to create more opportunity, not less. That being said, It should be obvious that paying off higher interest debt first is the priority, (Paying off a zero percent interest car loan early is just foolish)