Itu2019s not hard at all. The lender will evaluate your credit history (minimum score 620) and your debt-to-income ratio (DTI). Theyu2019ll do this by adding up your total house payment (including taxes and insurance if you own your home, rent if you donu2019t) and any debt payments you have with 10 months or more remaining. Then theyu2019ll look at the market rent for the property youu2019re buying (Iu2019m going to assume it 1u20134 units). That number will come from the appraisal. Theyu2019ll multiply the market rents by 75%, then subtract the total payment including taxes and insurance. If the number is positive, itu2019ll be treated as income. If itu2019s negative, itu2019ll be counted along with your other debt payments.This total expressed as a percentage of your gross monthly income is your DTI. At this moment, 45% is the maximum for a loan that will sell ultimately to Fannie Mae. On July 29 of this year, that maximum will go to 50%.The lender will also require some amount of liquid reserves after closing. The amount will depend on the total number of properties you own, but it will be between 2%-6% of the outstanding balances of the other properties apart from your personal residence.You can buy a rental home with as little as 20% down, but increasing the down payment to 25% will get a rate that is significantly better than for the smaller down payment.Other than these things, thereu2019s no big difference between buying an investment property (1u20134 units) and buying your personal residence.I hope this is helpful.