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How do I know if refinance is beneficial enough to me?
When evaluating a refinance, you need to figure out the payback time. Refinancing costs money in closing costs. The payback time is the time it takes to recover the closing costs with the amount of money you are saving in interest.  For example, if the closing costs are $2,000, your payback time is 2 years if it takes 2 years to save that amount in interest with the new interest rate vs. the old one.  To estimate this, look at the difference in interest rate between your mortgage and the new one, and your mortgage balance. For example, let's say that you have $100,000 left on your mortgage, and the new rate is 1% lower than your current rate. In one year, you will save roughly $1,000 in interest. If your closing costs are $2,000, then your payback time is somewhere around 2 years. If you plan on staying in this house longer than the payback time, then it is beneficial to refinance.  There are mortgage refinance calculators online that will calculate payback time more precisely.  One thing to watch out for: when you refinance, if you expand the term of your mortgage, you might end up paying more interest over the long term, even though your rate is less and your monthly payment is less. For example, let's say you currently have 8 years left on a 15-year mortgage. If you refinance to a new 15-year mortgage, your monthly payment will go down, but if you only pay the new minimum payment for the next 15 years, you could end up paying more in interest than if you had just continued with your old mortgage for the next 8 years. To avoid this, refinance to a new mortgage with a term close to what you have left on your current mortgage. If you can't do that, continue paying whatever your current monthly payment is after you refinance, and you'll pay your new mortgage early and save on interest.