Married Filing Separate - Divide Itemized Deductions
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Per Other Deduction Questions from the IRS:

My spouse and I are filing separate returns. How can we split our itemized deductions?

If you and your spouse file separate returns and one of you itemizes deductions, the other spouse will have a standard deduction of zero. In this situation, the other spouse should also itemize their deductions.

  • You may be able to claim itemized deductions on a separate return for certain expenses that you paid separately or jointly with your spouse.
  • Deductible expenses that are paid out of separate funds, such as medical expenses, are deductible by the spouse who pays them.
  • If these expenses are paid from community funds, the deduction may depend on whether or not you live in a community property state.
  • In a community property state, the deduction is generally divided equally between you and your spouse.

Please be aware that filing a tax return with the status Married Filing Separate may limit or disqualify your eligibility to claim certain deductions or credits.