If you are working legally then you can use your income.
Please be advised my answers to questions does not constitute legal advise and you should not rely on it, due to the fact that we have never met, I have not been aprised of the facts in you case nor have I reviewed any documents.
I agree with my colleagues.
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As long as you are lawfully present and in status on your H1B, your income can be included. A letter from your employer will be required as part of the documentatiion submitted with the I-864A you will need to complete.
It might be worth your time and trouble to consult with an experienced immmigration attorney for a full review of your circumstances.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. A consultation with an experienced attorney is always the best way to go.