(as) certain as death and taxes
Certain to happen; inevitable and unavoidable. A variation of the proverbial phrase, "Nothing is certain but death and taxes." They just aren't right for each other; they're certain as death and taxes to break up eventually. The two brothers will be forever at each other's throats, as certain as death and taxes. Of course Evelyn got the promotion—it was as certain as death and taxes. She is the boss's favorite, after all.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
death and taxes, certain as
Also, sure as death and taxes. Bound to occur, inevitable, as in His business is going to fail, certain as death and taxes. This phrase was invented by Benjamin Franklin in a letter (1789) and has been repeated ever since, the government's recurring need for revenue probably assuring its continued popularity.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.