You will only need to upgrade when your tax situation is no longer covered under the current product that you have. You will be prompted to upgrade when you no longer qualify for the current program.
If you need to see a breakdown of your charges, follow the instructions in the following FAQ.
https://ttlc.intuit.com/replies/4202093
If you need to downgrade to a lower-priced version, you can follow the instructions in the following FAQ.
https://ttlc.intuit.com/replies/3288495