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Phrase(s): Nothing is certain but death and taxes.
Prov. Everything in life is unpredictable, except that you can be sure you will die and you will have to pay taxes. (You can also refer to death and taxes as the only certain things in life.) • Son: I can’t believe how much tax money is being withheld from my paycheck! Father: Welcome to adult life, where nothing is certain but death and taxes.
McGrawhill's American Idioms And Phrasal Verbs