OP will be required to show supporting income at 125% of poverty guidelines[/url] or substitute capital @ 3x the annual level. In this case, the non US citizen's income will not count.

The poverty guidelines can be found with a Google search -- since this site will not currently allow me to post the URL.

So, a US citizen living in Chicago with one child who was sponsoring his or her fiancée or spouse would need an annual income of at least 17,600 x 1.25 = 22,000 USD to satisfy the hurdle.

Without an income, capital of 3 x 22,000 = 66,000 USD would equally satisfy the requirements.

And finally, if the US citizen had a lower than required annual income of, say, 16,000, they would need -- in addition -- capital of (22,000 - 16,000) x 3 = 18,000 USD to pass this part of the test.