Here is an article with more information on the gift tax: https://turbotax.intuit.com/tax-tips/estates/the-gift-tax-made-simple/L5tGWVC8N
"For example, say you gave $30,000 to your child in 2018. By treating it as a split gift, you can completely shelter the gift with your $15,000 exclusion plus your spouse’s $15,000 exclusion. That way no gift tax is due, and the gift doesn't reduce the $11.180 million lifetime gift tax exemption in effect for 2018 or the estate tax exemption for you or your spouse. If you choose to make a split gift, you must file Form 709, and your spouse must consent to the arrangement."