Is the Capital One Spark Cash Plus worth the annual fee?

The Capital One Spark Cash Plus is a straightforward business credit card.Cardholders earn unlimited 2% cash back on every purchase, with no spending caps or bonus-category restrictions. But unlike the no-annual-fee Capital One Spark Cash Select, which earns 1.5% cash back on purchases, the Spark Cash Plus charges a $150 annual fee.So, is the extra 0.5% cash back enough to justify paying $150 a year? Let's break it down.Is the Spark Cash Plus worth the annual fee?For lower-spending businesses, likely not. If you're comparing the Spark Cash Plus with the no-annual-fee Spark Cash Select based solely on ongoing cash-back value, you need to spend more than $30,000 per year before the Spark Cash Plus comes out ahead.Even then, the advantage is relatively small at first. For example, a business spending $36,000 annually would earn just $30 more in net rewards with the Spark Cash Plus.XAVIER LORENZO/GETTY IMAGESThe card becomes more compelling, however, as your business spending increases. And if you spend at least $150,000 annually, Capital One will refund the $150 annual fee.The calculation is also much more favorable in the first year, when the Spark Cash Plus' welcome offer can provid...