What is an example of non-deductible business expense?

The lavish buffet lunch at a 5-star hotel is considered a non-deductible business expense because it does not align with the IRS guidelines regarding business meals and entertainment. The IRS allows businesses to deduct only 50% of the cost of meals that are directly related to the active conduct of a trade or business, and even then, the expenses must be reasonable and not extravagant. Meals that could be deemed lavish or extravagant, regardless of the business purpose, are not deductible. Thus, this expense fails to meet the necessary criteria for deductibility due to its opulent nature.

In contrast, other options like transportation expenses for client meetings, office supplies for business operations, and rent for a business location are generally considered necessary and ordinary business expenses, which can be deducted according to IRS regulations. These costs directly contribute to the operation and functioning of a business, making them eligible for taxation deductions.