Apple's services revenue is growing at a rapid pace and is on track to be the company's primary revenue driver in the future, according to a note Morgan Stanley analyst Katy Huberty shared with investors this morning (via Business Insider).

Huberty believes that over the course of the next five years, services revenue growth will contribute more than 50 percent of Apple's total revenue growth. The iPhone, meanwhile, will make up just 22 percent of revenue growth during the same time period, despite the fact that it's contributed 86 percent of Apple's revenue growth over the past five years.

Although "over the last five years, the vast majority (86%) of Apple's 8% annual revenue growth was driven by iPhone sales, it is through monetization of Apple's Services business that we see the company still generating mid single digit revenue growth," she said. Huberty estimated that roughly 60% of revenue growth is now attributable to services. That, coupled with wearables, like the Apple Smart Watch, "will drive almost all of Apple's growth over the next five years," she added.

For the last several years, Apple's services category has been setting continual quarterly revenue records thanks to its rapid growth. In the first fiscal quarter of 2018, for example, services brought in $8.5 billion, up 18 percent year over year.

The services category includes iTunes, the App Store, Apple Music, iCloud, Apple Pay, and AppleCare.

According to Huberty, services revenue is at roughly $30 per device, up from $25 two years ago, but that might not be an accurate reflection of actual spending. Most Apple users do not currently pay for services, which could mean that revenue per active user is well above and "possibly double" the $30 metric.



Just 18 percent of Apple's total device installed base subscribe to paid Apple services, which means there's a lot of potential for growth in recurring revenue sources. Apple Music, iCloud, and Apple Pay are all services that Huberty believes have yet to be fully monetized.

Apple Music, as an example, has seen considerable growth since its launch and now boasts over 36 million subscribers. Just 2.9 percent of Apple customers subscribe, however. Apple Pay usage is also low, despite the fact that it's available in more than 50 percent of retail locations in the United States.

According to Huberty, Morgan Stanley is confident in Apple's growth through services monetization, with the firm setting a price target of $203 on Apple shares, which are currently trading at ~$170.

As Tim Cook often says, Apple's services category has already reached the size of a Fortune 100 company, and Apple has set a goal to double its 2016 services revenue by 2020, a target the company is well on its way to hitting.