Find a hot real estate market. Buy a house for $300k with 10% down. Rent it for $2500/mo, that will cancel out the down payment in the first year. Values in the right markets can easily go up 20% in a year right now. So after a year you the house is worth $360k. You just made $60k profit, off of a $30k buy in. So $90k gross in a year. If the market stays hot, you’ve already wiped out the down payment, so year 2 you’re over $100k profit. Interest at rates right now would only be around $8000/yr. So subtract that.