If you were legally married on or before 12/31/2014 then you can only file as Married Filing Jointly or Married Filing Separately. In most cases you would want to file as MFJ even if one spouse has little of no income. You receive the highest standard deduction of $12,400 and you each receive a personal exemption of $3,950.
If you were married in 2015, then you would file as Single on your tax year 2014 return. You may be able to claim your wife as a dependent under the Qualifying Relative rules if she meets the requirements in 2014.
Qualifying Relative -
1. The person cannot be your qualifying child or the qualifying child of any other taxpayer. A child is not the qualifying child of any other taxpayer if the child's parent (or any other person for whom the child is defined as a qualifying child) is not required to file an income tax return or files an income tax return only to get a refund on income tax withheld.
2. The person either (a) must be related to you or (b) must live with you all year as a member of your household.
3. The person's gross income for the year must be less than $3,950 (social security does not count) in 2014
4. You must provide more than half of the person's total support for the year.
5. The person must be a U.S. citizen or a U.S., Canada, or Mexico resident for some part of the year.
6. The person must not file a joint return with their spouse.
