If you have chosen to file your tax returns as Married Filing Separately then your tax return does not include any of your spouse's tax data and their tax return does not include any of your tax data. However, you must enter your spouse's name and Social Security number on your tax return and they have to enter your name and Social Security number on their tax return.
Filing as MFS is usually the very worst way to file a tax return when you are married.
See this TurboTax support FAQ for filing jointly versus separately - https://ttlc.intuit.com/community/married/help/is-it-better-for-a-married-couple-to-file-jointly-or-...
