Yes -- Model 3 is INELIGIBLE for this because it's <6000 pounds GVWR weight. There are limits on how much you can depreciate a regular (non heavy SUV) car, regardless of whether it's all at once or over time. You can check with accountant about your own situation. Moreover, in CA state (where I am), top tax rate is 13.3% and if you're a self-employed or small business owner you can be paying several % more for other taxes like social security and Medicare - adds up. Upfront deduction means you can also "lock in " a 100% or so write-off immediately, rather than having to keep business use high every single year that follows...
But not in California, Melania. California has not adopted any of the new federal depreciation rules. So, you are stuck at 12.3% for your California taxable income between $1,000,000 and $1,145,960, and the dread 13.3% on your taxable income in excess of $1,145,960. I gleaned earlier that you are married, filing jointly.
And a minor note--likely irrelevant to those of you on here--but you never know. The TCJA also instituted limitations for deducting business losses against other income and other business profits. These limitations are 500K MFJ and 250K for everybody else. So, single taxpayer A earns $275,000 in wages, $25,000 in dividend and capital gain income, a share of profits from a real estate partnership of $70,000, a share of losses from a second non-passive partnership of $40,000, and a self-employment loss in his new enterprise of $270,000, including writing off $110,000 on his Model X. So, his income before personal deductions will be limited to 275+25+70-250 since the losses (40+270) exceed 250K. Surprise! Income before personal deductions is $120,000, not $60,000. The excess losses are carried over to future years as an NOL, so all is not lost.
Like a lot of things with the Internal Revenue Code that apply to a select group of taxpayers, ya gotta watch where you step before you plant your foot.
Don't say you weren't warned.