SaaS removes the need for organizations to install and run applications on their own computers or in their own data centers.
This eliminates the expense of hardware acquisition, provisioning, and maintenance, as well as software licensing, installation and support.
Other benefits of the SaaS model include:

Flexible payments: Rather than purchasing software to install, or additional hardware to support it, customers subscribe to a SaaS offering. Generally, they pay for this service on a monthly basis using a pay-as-you-go model.  Transitioning costs to a recurring operating expense allow many businesses to exercise better and more predictable budgeting.  Users can also terminate SaaS offerings at any time to stop those recurring costs.

Scalable usage: Cloud services like SaaS offer high scalability, which gives customers the option to access more, or fewer, services or features on-demand.