Hi Dtjoan. IF bank pre-approved you for $150,000, you can just put that $40,000 cash into your bank and bring 1 certified bank check on settlement day (that covers the $40,000 difference on the house PLUS the rest of your minimum down payment of whichever loan type you chose, either FHA, Conventional, or VA, AND the rest of your closing costs and fees that are involved with the sale of the house). Your buyer's agent should be able to assist you with guiding you throughout the entire process. But if you're not working with anyone and require a buyer representation, please feel free to contact me via email, text or phone. Hope this helps and good luck with your home search process.