The Mortgage Interest Deduction After Refinancing

If you already own a home and are thinking about getting a new mortgage to replace your old one, you probably know that refinancing can lower your monthly payment or let you take cash out for other expenses. But what happens to the tax break you get from paying mortgage interest? Many homeowners assume that refinancing doesn’t change anything, but that’s not always true. The rules around the mortgage interest deduction can shift a little when you swap one loan for another. Understanding those changes can help you plan better and avoid surprises when you file your taxes.

First, let’s cover the basics of the mortgage interest deduction. When you own a home and have a mortgage, the interest you pay each year on that loan can be subtracted from your taxable income. This lowers the amount of income the government taxes, which can save you hundreds or even thousands of dollars. For most homeowners, this deduction applies to interest on up to $750,000 of mortgage debt if you bought your home after December 15, 2017. If you bought before that date, the limit is higher – up to $1 million. These limits are for your primary home and a second home combined. You can deduct interest on the part of your mortgage that is used to buy, build, or improve your home. That’s called acquisition debt.

Now, when you refinance, you are essentially paying off your old mortgage with a new one. The new loan replaces the old debt. For tax purposes, the key question is: does the new loan still count as acquisition debt? The answer is yes, but only up to the amount of your old mortgage balance at the time you refinance. If you took out a $200,000 mortgage to buy your house, and you still owe $180,000 when you refinance, then $180,000 of your new loan is considered acquisition debt. That part of the interest is deductible, just like before. The remaining $20,000 you originally borrowed but have since paid down? Don’t worry – you can still deduct interest on the full $180,000, as long as you meet the regular limits.

But here’s where things can get tricky. Many homeowners use a cash-out refinance, where they borrow more than the remaining balance on the old mortgage. For example, if you owe $180,000 but take out a new loan for $230,000, you get $50,000 in cash. That extra $50,000 is not acquisition debt. It is considered home equity debt, and the tax rules for that kind of debt changed a few years ago. Starting in 2018, you can no longer deduct interest on home equity debt unless that money is used to substantially improve your home. So if you take cash out to pay off credit cards, buy a car, or take a vacation, the interest on that $50,000 is not deductible. However, if you use the extra cash to add a new room, replace your roof, or install a new HVAC system, then that amount becomes acquisition debt for the improvement. You can deduct the interest on the improvement portion, as long as you keep receipts and records.

Another important detail involves points. When you refinance, you may pay points – upfront fees that reduce your interest rate. Points are essentially prepaid interest. For a purchase mortgage, you can usually deduct the full amount of points in the year you buy the home. For a refinance, the rules are different. Points paid on a refinance must be spread out over the life of the loan. So if you pay $3,000 in points on a 30-year refinance, you deduct $100 each year for 30 years. There is an exception: if you use part of the refinance proceeds to improve your home, you can deduct the points related to that improvement more quickly. Also, if you refinance again later, you can deduct all the remaining undeducted points in the year you pay off that loan.

One more thing to keep in mind – the standard deduction. A lot of people assume they will benefit from the mortgage interest deduction, but that’s not automatic. To claim it, you need to itemize your deductions on your tax return. Itemizing means listing out all your deductible expenses like mortgage interest, property taxes, charitable donations, and medical costs. If the total of those items is less than the standard deduction, you are better off taking the standard deduction and you get no tax benefit from your mortgage interest. For 2024, the standard deduction is about $14,600 for a single person and $29,200 for a married couple filing jointly. Many homeowners with smaller mortgages or lower interest rates may not have enough deductions to itemize. So refinancing to a lower rate could actually reduce your interest payments to the point where you no longer itemize, and you lose the deduction entirely. That’s not necessarily bad – you also pay less interest overall – but it’s something to be aware of.

Finally, always remember that tax laws can change, and everyone’s situation is different. This article gives you a general idea, but you should talk to a tax professional or use reliable tax software before making decisions based on these rules. Keeping good records of your refinance paperwork, including the settlement statement showing how you used the cash, will make tax time much smoother. The mortgage interest deduction can still save you money after refinancing, but only if you understand how the new loan fits into the tax code. Plan ahead, and you can keep more of your money where it belongs – in your pocket.