Proof of source through life-time income
Another means of doing this is having an applicant use her life-time earnings as investment funds, which means that an applicant could accumulate her investment fund from relatively small amount of annual income for a long period of time. The applicant needs not provide the tax returns of each year during which she accumulated her investment fund, but she must provide some evidence that her employment or trade has enabled her to lawfully accumulate the fund. Sometimes, proof of applicant’s annual living expenses would be requested by USCIS.