Your client, Dental Dave, DDS, is a dentist who is a cash basis taxpayer. Dave is in the 40% tax bracket. He leases office space from the owner of a medical office building. In July 2018 he entered into a ten-year lease with an option to extend his lease for another two years. The lease calls for rent of $24,000 per month in the first year and provides for annual rent adjustments based on the Consumer Price Index. It is December 2018 and your client has asked how much he will save in taxes for 2018 if he prepays the January 2019 rent before December 31, 2018. What is your answer? Why?