When you file married filing separately, both of you must itemize, or both use standard deduction. Medical deductions are itemized deductions, of course. So you and your spouse have to agree on how to divide the deduction--one possible way would be for each of you to use your own paid medical expenses, or you could divide the medical expenses you paid 50-50. If you are filing separately, you have to mutually agree on each of the itemized deductions as to who claims what. There cannot be any "double dipping." If you are in a community property state--then you have to follow the rules strictly for community property.
Why do you want to file separately?
Married Filing Jointly is usually better, even if one spouse had little or no income. When you file a joint return, you and your spouse will each receive the $4000 personal exemption, plus the married filing jointly standard deduction of $12,600 (add $1250 for each spouse over the age of 65). You are eligible for more credits including education credits, earned income credit, child and dependent care credit, and a larger income limit to receive the child tax credit.
If you choose to file married filing separately, both spouses have to file the same way—either you both itemize or you both use standard deduction. Your tax rate will be higher than on a joint return. Some of the special rules for filing separately include: you cannot get earned income credit, education credits, or deductions for student loan interest. A higher percent of your Social Security benefits may be taxable. In many cases you will not be able to take the child and dependent care credit. If you live in a community property state, you will be required to provide additional information regarding your spouse’s income. If you are using online TurboTax to prepare your returns, you will need to prepare two separate returns and pay twice.
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