Prior to March 14th, 2023 Google Workspace only offered monthly adjusted billing. But now you can choose a Flexible Plan or Annual Plan. You will still pay monthly no matter which billing plan you choose, but pricing is lower per user for the Annual Plan because you are committing to remain a customer for at least a year at the expense of being able to adjust the number of users in your account lower. You can always add more users to an annual billing plan, but not remove them prior to the end of the annual billing cycle. Keep in mind that for new accounts you can get a free 14-day trial and for new and upgrading accounts you can get a 10% discount for 12 months using a Google Workspace promo code. The Google Workspace promo code is free.