Marriage penalty

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The marriage penalty in the United States refers to the higher taxes required from some married couples with both partners earning income that would not be required by two otherwise identical single people with exactly the same incomes. There is also a marriage bonus that applies in other cases. Multiple factors are involved, but in general, in the current U.S. system, single-income married couples usually benefit from filing as a married couple (similar to so-called income splitting), while dual-income married couples are often penalized. The percentage of couples affected has varied over the years, depending on shifts in tax rates.