Mortgage loans are mainly necessary, since most people cannot afford to buy a home for cash. Interest paid on your mortgage is tax-deductible. This makes your house more affordable, but I wouldn't say it's exactly a good thing in and of itself. Home equity lines are revolving loans (like a credit card) that you can spend and repay monthly. The benefit is that you can use it like a credit card and the interest is also tax-deductible. But as I said before, this isn't exactly a good thing in and of itself. If you paid your bill in full every month you'd pay no interest, and save far more money than paying a bunch of interest and getting a small tax cut for it. But it can be used wisely. I've known people who've bought their car with their equity line. This is a much better than getting a car loan, as the interest rate is much lower and you can write off the interest.
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