There is a fine line between tax avoidance and tax evasion.
You cannot take your $168,000 Bentely.place a sign on the side and write it off. You can only write off the standard deduction for a vehicle as outlined by the IRS. Example: Ford Taurus.
I am allowed to write off the % of my plane used for work. The rest I eat. There is no FIXED or PRESET $ amount on the plane.
You are allowed to write off interest on a boat as a second home if it has a bed, john and stove. However, if you already have a second home you are currently deducting you cannot.
Talk to you tax accountant. For the few $ you save you could cost yourself a bundle. Once you are audited I guarantee you they will find something and dig back 5 years.
There are certain RED FLAGS tat the IRS look. Today, your return information is entered into a computer. If the averages check out and there are not any RED FLAGS or items that trip the breaker, you are OK. Offices in homes, boats as second homes large advertising budgets are a few examples.