If you did not already submit your return and you are filing a joint return, then you can simply go back and add his income under the retirement income section as long as you are filing a joint return. You can find this by typing SSA-1099 in the search box and selecting Jump To
If you did already submit your return and you are filing a joint return, then you would need to Amend Your Return in order to add his social security to your return.
If you are filing separate returns, then you do not add his income to your return.
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