If you are applying for the loan, you can not in any circumstances count income that is on someone else's tax forms. If they are going to be on the loan that is another story. If that is the case, then all of their debts and income would be counted. They can not "assign" the income to you no matter who the checks were written to, where they were cashed, etc. It has to have been on your taxes. The loan officer will only check the lease and the previous rental checks possibly, the UW will require proof of that income as claimed taxable income if you want to use it to qualify.