When you file married filing separately, the cap for total state and local taxes is $5000. That includes all of your state and local income or sales tax and your real estate taxes too.
The mortgage interest deduction is limited to the interest on up to $375,000 mortgage loan when you file separately.
You may not be aware that if you itemize, your spouse must itemize too. If you take the standard deduction, your spouse must do the same.
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