Can I change or downgrade my plan?
Yes — switch tier either way from the billing page, prorated and charged at the time. A downgrade is blocked only if you have too many properties for it.
The billing page shows all three tiers with a switch button on each. Moving in either direction is prorated by Stripe, so you're credited or charged for the remainder of the period rather than paying twice. You're shown the figure before you confirm, and an upgrade is charged there and then — moving up doesn't change your renewal date.
The only restriction is arithmetic: you can't downgrade into a tier that doesn't fit your current property count. The button is disabled with an explanation rather than failing after you press it.
Switching between monthly and annual billing is a separate button and can be done independently of changing tier. The billing page shows you what the switch costs before you confirm it.
Worth knowing: Moving to annual charges the year straight away, less credit for the days you've already paid for, and your renewal date moves to that day. Moving back to monthly part-way through a year you've already paid for doesn't refund the balance to your card — it becomes credit on your account, which comes off your invoices until it runs out. Your billing page shows the credit you're holding.
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Not legal advice
These answers describe how Tenarize works and summarise the law in England as the product implements it. They are not legal advice about your situation, and the law changes. For free independent help, Citizens Advice and Shelter both cover renting in England; for anything unusual or contested, take advice from a solicitor.
Tenarize does not currently support Scotland, Wales or Northern Ireland, whose tenancy regimes are different.