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The first payer listed on  a tax return  is the "Taxpayer", the 2nd person is the "spouse".  To chance the order, start a new tax return  and start over.

Note: that is you filed a joint return in 2017 then do not change the name order from 2017.  The IRS warns that changing the name order on a joint return form one yer to the next an cause long processing delays.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**