Yes, it can be.
 
	 
 
	https://www.uscis.gov/sites/default/files/document/forms/i-864ainstr.pdf
 
	 
 
	"Item Number 7. Current Individual Annual Income. Enter your current individual earned or retirement annual income that you are using to meet the requirements of this contract and type or print the total on this line. You may include evidence supporting your claim about your expected income for the current year if you believe that submitting this evidence will help you establish an ability to maintain sufficient income. You are not required to submit this evidence, however, unless specifically instructed to do so by a government official. For example, you may include a recent letter from your employer, showing your employer’s address and telephone number, and indicating your annual salary. You may also provide pay stubs showing your income for the previous six months. If your claimed income includes alimony, child support, dividend or interest income, or income from any other source, you may also include evidence of ability to maintain that income. However, you may not include any means-tested public benefits as income for the purposes of meeting the income requirement"