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You can gift your son up to $14,000 each ($28,000 total) without having to file a gift tax return.
If you gift him over that, you would have to file a return, although no gift tax is due whatsoever unless you have given away more than $5.2 million during your lifetime.
If you wish to loan your son the money, then no disclosure is needed to th eIRS
You would simply create an agreement which states the loan amount, interest rate, and payment schedule.
But to reiterate, there is no tax if you gift your son money if you have not gifted over $5.2 million during your life.
If you want this to be a loan you would need a promissory note with the loan amount, interest rate, and repayment schedule.
If you gift $28,000 or less ($14,000 for each you and your wife) there is no need to do anything - not even file a gift tax return
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