Blue Business Plus from American Express

The Blue Business Plus earns a flat 2 points per dollar on everything with no annual fee, which makes it one of the easier ways for a small business to earn points without tracking categories. American Express recently raised the welcome offer sharply, from 15,000 to 50,000 points after $5,000 in spend within three months, a big improvement over its recent norm. You also get a 0% intro APR on purchases for 12 months. The tradeoff is the cap: the 2x rate covers only the first $50,000 in purchases each year before falling to 1x, so it suits businesses with moderate spending more than large ones. A foreign transaction fee applies, so it is not the card to use on purchases abroad.