Donald Trump vowed to eliminate the estate tax during his presidential campaign, calling the 100-year-old tax “a disaster” and “a horrible weapon that has destroyed many families.”

If there are such families, the number is likely small, since very few Americans pay an estate tax. Last year only 4,918 estates owed money under the law, according to the Internal Revenue Service. That’s because anyone with an estate worth less than $5.34 million, or $10.68 million for a couple, is exempt.