Please Help! John and Mary Jane Diaz are married, filing jointly. Their address is 204 Shoe Lane, Blacksburg, VA 24061. John is age 35, and Mary Jane...

John has always wanted to operate his own business. In October 2018, he incurred expenses of $15,000 in investigating the establishment of a retail computer franchise. With the birth of their child expected next year, however, he decides to forgo self-employment for at least a couple of years.

John and Mary Jane made charitable contributions of $3,700 during the year and paid an additional $1,800 in state income taxes in 2018 upon filing their 2017 state income tax return. Their deductible home mortgage interest was $8,200, and their property taxes came to $4,800. They paid sales taxes of $2,000, for which they have receipts. They paid a ticket of $150 that Mary Jane received for running a red light (detected by a red light camera).

Part 1—Tax Computation

Calculate John and Mary Jane's tax (or refund) due for 2018.