Whats the difference between married-combined and married-joint?

    Filing Status for Married Persons
    Married persons may file tax returns in any of these three methods: (1)
    joint, (2) combined, or (3) separate. Choose the method which results in the least amount of tax.
    (1) A  joint return  is usually completed when only one spouse has
    income.  Place all income, deductions, exemptions, etc. in Column A
    (2) A  combined return  is completed when both spouses have income.
    Place one spouse's income in Column A (Taxpayer) and the other
    spouse's income in Column B (Spouse). The exemptions and deductions may be  divided in any manner you choose.  If only one spouse has income, this income may not be split between husband and wife.
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