with MFS all your spouse needs to furnish you - her name as used on her return, SSN and whether she used the standard deduction or itemized since both taxpayers must use the same method. your spouse does not have to furnish you with a copy of her return and you are not entitled to get a copy from the IRS. for a joint return, both taxpayers must consent (a written consent is not required). it is actually criminal for one spouse to file a joint return without the consent of the other.
