Since you were married as of December 31, 2012, you are considered married for tax purposes. You and your wife must file either married filing jointly, married filing separately, or under some circumstances it may be possible to file as head of household. It sounds like your wife was trying to get a bigger refund by filing as Head of Household. Unless you have been separate for a long time, this is not proper, You need to contact a CPA or other tax professional to prepare your tax return.
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Your spouse does not need your consent to file her own tax return, albeit she claimed the wrong status to reduce the marginal tax rates imposed for married-separate vs. Head of household.
My answer is not intended to be giving legal advice and this topic can be a complex area where the advice of a licensed attorney in your State should be obtained.
Hello. Your post and questions are not clearly written. One spouse does not need permission from the other spouse in order to file personal income taxes separately. As to the other matters, more information needs to be known upon discussion with you. I urge you confer with an attorney who can assist you in tax matters or an accountant. Some attorneys, myself included, are available seven days for emergency legal needs. Many attorneys will confer initially at no charge. Then, if legal work is performed, some attorneys, myself included, will provide a reduced fee for need. All the best.
Tricia Dwyer, Esq., Tax Law, Family Law, Rule 14 Qualified Neutral, Minnesota Supreme Court Roster Mediator, Tricia Dwyer, Esq. & Associates PLLC, Phone: 612.296-9666 EVERY DAY OF THE YEAR until 8 p.m. daily. See www.dwyerlawfirm.net