I was told by an attorney that my income could be taken into account if
we had lived together for over 6 months. We didn't need to do that as my
wife earns enough on her own so I haven't looked into that any further.
Perhaps someone else would have a more definite answer.
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Posted via http://britishexpats.com
The instructions are pretty clear on the form-- yes, your income can be
included with your spouse's if you have lived in the same household for
6+ months.
While the I-864A should not be required to accomplish this, it never
hurts to include one in case your officer sees things differently.
Complete the form from the US citizen perspective, and lump your income
with his on the appropriate line.
Tax returns and W-2s will sort things out at the interview.