Considering the costs associated with refinancing—several thousand dollars or more in appraisal and other fees—it’s not always the smart move. But the rule of thumb is that if the new rate is a percentage point lower than your current one and you plan to stay in your place for the foreseeable future, it’s worth it. If the difference in rates is more like half a point, it’s still a good idea to examine your options.
Of course, everyone’s circumstances are different. Zillow has a handy refi calculator, which not only shows how much you’d save each month but also the point at which you’d break even on the fees (useful if you’re mulling a move in the next few years).
Also, keep in mind that if you own a co-op, the board will have to sign off on your application. If you’re refinancing simply to take advantage of lower rates (and not borrowing more money than your initial loan or otherwise affecting the loan-to-value ratio), your board will likely approve the plan without a fuss.
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