Maybe. Filing status normally is determined by your marital status on the last day of the tax year. Since you were married on the last day of December (the last day of the “tax year”), you would normally have to file as a married person.
But you can be entitled to file as a single taxpayer for last year’s taxes if the following requirements are met:
- You must file a separate return;
- You must furnish more than one-half of the cost of maintaining the household that, for more than half of the tax year, was the principal home of the child (including an adopted child) or stepchild;
- You are entitled to a dependency exemption for the child (or would be entitled except for waiver of the exemption to your spouse); AND
- The other spouse was not a member of your household at any time during the last six months of the year.