Some good pointers to caselaw and regs from a recent case addressing start-up costs, Yapp v Commish TC Memo 2018-147. They had a few more zeros in the expenses they were trying to write off early:
A taxpayer is not carrying on a trade or business for section 162(a) purposes until the business is functioning as a going concern and performing the activities for which it was organized. Richmond Television Corp. v. United States , 345 F.2d [*9] 901, 907 (4th Cir. 1965), vacated and remanded on other grounds , 382 U.S. 68 (1965); see also Glotov v. Commissioner , T.C. Memo. 2007-147. Business operations with respect to the activity must have actually commenced. See McKelvey v. Commissioner , T.C. Memo. 2002-63, aff'd , 76 F. App'x 806 (9th Cir. 2003). "Until that time, expenses related to that activity are not 'ordinary and necessary' expenses currently deductible under section 162 * * * but rather are 'start-up' or 'pre-opening' expenses." See Woody v. Commissioner , T.C. Memo. 2009-93, slip op. at 9-10 (citing Hardy v. Commissioner , 93 T.C. 684, 687-688 (1989), aff'd in part, remanded in part , 1990 U.S. App. Lexis 19670 (10th Cir. Oct. 29, 1990)), aff'd , 403 F. App'x 519 (D.C. Cir. 2010). Startup expenses, although not deductible during the pre-opening phase, may generally be deducted or capitalized and deducted over time upon a taxpayer's becoming actively engaged in business pursuant to section 195. Sec. 1.195-1T, Temporary Income Tax Regs., 73 Fed. Reg. 38910 (July 8, 2008).