will claiming my wife in tax return affect her green card petition?

If your wife is attempting to get her green card on the basis of marriage, any immigration officer or US consular official adjudicating or permanent resident application will want to see evidence of the bona fide character of your marriage. One indicia is whether the couple are filing joint tax returns. In cases where the alien spouse is overseas, and has never lived with the US citizen or permanent resident petitioner in the States, consular officials are more understanding as to why there is no joint tax return. Where the alien beneficiary is in the States after the marriage is celebrated, USCIS officers by and large in our experience usually expect to see joint tax returns or a good explanation why not. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.

No, it will not.