However, as a married couple with combined income of $1 million, they would pay 37 percent on $400,000 (the difference between their income and the $600,000 threshold for the highest rate). That would mean paying $8,000 more in income taxes.
Other parts of the tax code can also generate a higher bill. For instance, while an individual can have up to $200,000 in income before the Medicare surtax of 0.9 percent kicks in, the limit for married couples is $250,000.
Additionally, the new limit on the deduction for state and local taxes — also known as SALT — is not doubled for married couples. The $10,000 cap applies to both single filers and married filers. (Married couples filing separately get $5,000 each for the deduction).
Of course, the deduction only is available to taxpayers who itemize, and fewer people are expected to do so on their 2018 returns due to the doubling of the standard deduction. Itemizing married couples in higher-tax states — including New Jersey, California and New York — could be more affected by it, Westley said.