Here it is from their website, "The vehicles must be acquired for use or lease and not for resale. Additionally, the original use of the vehicle must commence with the taxpayer and the vehicle must be used predominantly in the United States. "
So, above poster is correct, but yes, there is also no specific timeline stated, so there is no way to prove whether you bought it for resale or not. You can buy a car, drive it for one day, not like it, then sell.
Here's how an audit works. Some are done at random, most are done based on a trigger. They make decisions during your audit, some of which are arbitrary. If you do not declare the profit of resale, you have falsified your income. If you do declare it as income, it would be their choice to say whether or not you intentionally bought the car for resale.
My guess is if you were caught, it would be based on a bank deposit trigger of more than $60k after a withdrawal of a lessor amount with no other documentation for the transaction, or declaration of the sales tax exemption when you don't own the car, or the buyer files for the tax credit.
You can fight an audits results, possibly all the way to the SCOTUS like the 'tomato is a vegetable' decision. But I doubt anybody will take the case pro bono.
The reality is that you probably won't get caught unless the new owner files for the tax credit. So it depends on how robustly your CPA does your accounting. We were audited once. High anxiety for 3 days. That's all the time between the IRS letter and the appointment we received. Couldn't sleep without nightmares. Not sure what triggered it. I didn't have money for a legal battle. My neighbor was having his business audited for the last year, and he was in a death struggle. They win, he closes up. They wanted over $40k from him. ($40k was a lot back then)
In the end, the trigger was excessive mileage credit for education required for business. He said he would get back with us with a decision. Another 7? days of high anxiety then we received a letter. It had a check for $253 in it. We overpaid. The letter said the mileage was acceptable.
So it boils down to whether you're an adrenaline junkie. Racing actually calms me down (unless the vehicle is on fire, a pet peeve), but audits do not. My quality of life is more important than a few thousand dollars.