The IRS is intensifying scrutiny of grantor retained annuity trusts (GRATs), a favored estate-planning tool used by ultrawealthy families to transfer assets with minimal gift taxes. One prominent family faces a $736 million gift tax bill tied to its GRATs, highlighting the agency's aggressive enforcement. GRATs allow donors to place assets in a trust for a set term, receiving annuity payments while any appreciation passes to heirs tax-free if the donor survives the term.

The strategy has proliferated among high-net-worth individuals, but the IRS is now challenging valuations and structures it deems abusive. This case signals broader regulatory pressure on sophisticated wealth-transfer techniques. Tax advisors warn the ruling could reshape estate planning for wealthy families nationwide.