How do i amend my taxes i submitted this year? I did married filing jointly and i meant to do separately, and now my husband can't submit his.

If you want to make changes or add a document to a tax return that has already been filed and accepted by the taxing agency, you should follow these guidelines. 

• You must first wait until the initial return is completely processed.
• You will have to use the same TurboTax account that you used for the original tax return.
• Once you begin your amendment, you'll see your original return.
• The refund calculator will start new at $0 and only reflect the changes in the refund or tax due
• Only make changes to the areas of your return that need to be corrected.
• You have three years from the date you filed your return or two years after you paid the tax due (whichever is later) to file an amendment

Select your product below and follow the instructions. 

Amend TurboTax Online 

Amend TurboTax CD/Download 

Sorry you can't amend to  MFS Married Filing Separately from Joint after the due date, April 15, 2025.  You can amend to add his info and income to your Joint return.  You may find Joint is better than MFS.

How to switch from Joint to Married filing separate
https://ttlc.intuit.com/turbotax-support/en-us/help-article/small-business-processes/switch-filing-jointly-filing-separately/L3UGzwHa1_US_en_US?uid=lskmcvqs

Here's some things to know about filing MFS

Many people think they come out better when filing Married Filing Separate but they are probably doing it wrong. If one person itemizes deductions then the other one must itemize too, even if it's less than the standard deduction, even if it is ZERO!

And there are several credits you can't take when filing separately, like the

EITC Earned Income Tax Credit

Child Care Credit

Educational Deductions and Credits

And contributions to IRA and ROTH IRA are limited when you file MFS.

Also if you file Married Filing Separately up to 85`% of your Social Security becomes taxable right away even with zero other income.

See …….
https://ttlc.intuit.com/community/married/help/is-it-better-for-a-married-couple-to-file-jointly-or-separately/00/25590