Buy a lot of office supplies or wireless services for your business? You can earn a hefty 5% cash back on those purchases with a SimplyCash Business Card from American Express, says Gonzalez at CardHub.

But even if you're not always stocking up on copy paper and pens, you can get 3% cash back on purchases in a category of your choice. If client dinners at conferences are a big expense, select dining for your 3% cash back. If you're always driving to far-flung offices, on the other hand, maximize your benefits by choosing gas stations.

If you apply by January 25, 2016, and spend $5,000 in the first 6 months, you'll get a one-time $250 statement credit. The card has no annual fee.