An odd way of thinking about it, but you’re selling the house to yourself.
When you bought the house it was 100k, now you only owe 50k.
You buy the house again for >=50k, with a different payment plan.
Maybe for a better interest rate to help save money in the long run. Maybe for lower payments to help save money for the time being.
Sometimes, you can buy that house from yourself for more than you owe, like 60k. The first 50k will cover the existing loan, and the extra 10k comes back to you to cover a large expense.
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