Discount
Annual Cloud billing is about 17% cheaper than twelve monthly payments (for example Solo $15/month or $150/year). The switch on Billing and on the public pricing page toggles the interval before checkout.
Switching mid-subscription
Changing monthly ↔ annual is a plan change through WayForPay, same as changing tier. Complete it from Billing as Owner. Do not start a second checkout for the same workspace while a change is in progress.