The tax on completed lifetime transfers from one individual to or for the benefit of another (other than annual exclusion gifts and certain direct payments to providers of education and medical care) that exceed the gift tax exemption amount ($5 million inflation adjusted).  Under the concept of portability in the tax law, if your spouse predeceased you after 2010 with remaining unused exemption (the deceased spouse unused exemption, or DSUE) and an estate tax return was filed, your exemption for gift tax purposes can be augmented by your deceased spouse’s DSUE.