You can watch the movie The Accountant (2016) on several streaming platforms:

• Amazon Prime Video (including Prime Video with Ads and Max Amazon Channel) where it is available for streaming, rental, or purchase

• Max streaming service

• Netflix in some regions

• Hulu, Sling TV, and YouTube TV with a premium subscription

• Apple TV, where it can be rented or purchased

So, depending on your subscription or preference, you can stream it on Amazon Prime Video, Max, Netflix, or Hulu, or rent/buy it on Apple TV and other digital stores