Usually you would submit the most recent Income tax return. If you have no pay stubs, then I assume you are filing as self employed in which case USCIS can see your self employment schedule attached together with the business license.
Paystubs are not as important for the I_864 as are taxes, W-2, 1099 and employment letter if you have an employer or a self employment schedule with business license if you are self employed. You have to figure out if you are considered self employed or not.
If it becomes too confusing for you, you can state zero (or whatever amount you can evidence with documents) as your income on your I-864 and get a joint sponsor who does earn enough and has the required paperwork to prove it fill out an I-864 as the joint sponsor.
Good luck to you during this process and I hope this answer has helped you!
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