A gift tax is paid by the Donor (gift giver) for lifetime gifts totaling over $675,000. Gifts over $10,000 are reported on a gift tax return (Form 709), not the 1040. The gift tax rate starts at 37% for the first dollar over $675,000 and increases in a graduated manner to a top rate of 55% (at the $3 million mark).
The gift tax rate is the same as the estate tax rate (called the unified gift and estate tax). You can use your lifetime credit of $675,000 during your lifetime by gifting or at death your estate receives a $675,000 credit against estate taxes.
The donee (gift recipient) is not taxed.