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what is a mortgage gift exchange?
I'm guessing since I don't know the term, but it sounds like you're asking about the technique whereby a loan is used to gather multiple years' gift allowance into a single up-front transfer. For the subsequent N years, the giver pays the installments on the loan for the recipient, at a yearly amount small enough to avoid triggering Gift Tax. You still have to pay income tax on the interest received (even though you're giving them the money to pay you), and you must charge a certain minimum interest (or more accurately, if you charge less than that they tax you as if the loan was earning that minimum). Historically this was used by relatively wealthy folks, since the cost of lawyers and filing the paperwork and bookkeeping was high enough that most folks never found out this workaround existed, and few were moving enough money to make those costs worthwhile. But between the "Great Recession" and the internet, this has become much more widely known, and there are services which will draw up standard paperwork, have a lawyer sanity-check it for your local laws, file the official mortgage lien (not actually needed unless you want the recipient to also be able to write off the interest on their taxes), and provide a payments-processing service if you do expect part or all of the loan to be paid by the recipient. Or whatever subset of those services you need.  I've done this. In my case it cost me a bit under $1000 to set up the paperwork so I could loan a friend a sizable chunk of cash and have it clearly on record as a loan, not a gift. The amount in question was large enough, and the interpersonal issues tricky enough, that this was a good deal for us. Obviously, run the numbers. Websearching "family loan"  will find much more detail about how this works and what it can and can't do, along with services specializing in these transactions. NOTE: If you are actually selling something, such as your share of a house, this dance may or may not make sense. Again, run the numbers, and if in doubt get expert advice rather than trusting strangers on the web. (Go not to the Internet for legal advice, for it shall say both mu and ni.)