Portability of Estate Tax Exemption refers to the provision that allows a surviving spouse to inherit any unused federal estate tax exemption from their deceased spouse.
This means that if one spouse passes away and does not fully utilize their estate tax exemption, the surviving spouse can add that unused exemption to their own, effectively increasing the amount of their estate that can pass tax-free upon their death.
For example, if the federal estate tax exemption is $12 million and the deceased spouse’s estate was valued at $5 million, the unused exemption is $7 million. The surviving spouse can then combine their exemption with the deceased spouse’s unused portion, allowing up to $19 million to be passed tax-free at their death, provided the appropriate election is made on their estate tax return.