As with relocation expenses, you also cannot claim meal costs on your taxes if your employer reimburses you for them.

Beware of going overboard though. The IRS forbids deductions of lavish and extravagant meals, and if you do get audited it may prove difficult to show the necessity of such expensive meals.

businessman with company car

No. 1: Mileage expenses

If you use your vehicle for business, you'll want to keep one number in mind: 50.

That's how many cents each mile of your business-related driving -- not including your daily commute -- is worth as a write-off for your taxes.

But the IRS doesn't limit driving write-offs to just business traveling. You can also claim 16.5 cents for medical trips and 14 cents for each charity-related mile you drive, as long as you are making a dedicated trip to volunteer for a qualified nonprofit.

But the business driving expenses you can deduct don't stop with some help covering the ever-increasing cost of tax. You can also deduct any parking fees and tolls you pay as part of the business use of your vehicle.

If you feel that 50 cents per mile is a little low, you also have the option of calculating the actual costs of using your car for work. Details on how to claim those costs can be found on the IRS' website.