Proof of income is usually calculated with your NOA. You’ll have read the requirements and amounts but if you don’t meet the income requirement your application will be rejected. You would have to wait until you can prove a higher income for example after you file your 2019 tax return. Would do encourage you to read the application. I am unfamiliar with all that is necessary to apply.Oh wow that might impact my application then although I returned to work August 2018. So if my application gets delayed so that my income qualifies then I won't be able to sponsor my nephew.