Hi there, mbarbour.

If you're referring to the software itself, QuickBooks Desktop Enterprise is good for 3 years. You can also upgrade it annually since Intuit releases the latest version every January.

On the other hand, the Silver, Gold and Platinum plan for the add on support/functionality is based on an annual subscription.

For more details about QuickBooks Enterprise pricing and features, you can check out this link: Pricing for QuickBooks Desktop Enterprise.

You can also contact our Sales Support Team if you have some inquiries. Just check out their phone number below the Sign In tab.

Please reply to this post if you need anything else. I'd be glad to help.