If you are a US person you must file a gift tax return if you give anyone more than $15,000 per year. No taxes owed unless your lifetime total of gifts is more than $11 million, but the form must be filed.
There are no other banking or tax requirements. The bank may file a report for currency transactions over $10,000, but you don’t have to worry about this. If you make several small transactions under $10,000 in order to avoid the requirement for the bank to report transactions over $10,000, this can be considered a separate crime called structuring, even if the underlying purpose of the transaction is perfectly legal and legitimate.
