# Upgrade, downgrade & cancellation

Billing runs via **Stripe** — switching plans, cancelling and accessing invoices is fully self-service under **Settings → Billing**. Monthly and yearly billing are available.

## Upgrade — takes effect immediately

- The new plan applies **right away**; Stripe automatically prorates the period you've already paid for.
- Syncs [paused](https://docs.kalender-sync.de/en/sharings/pause-end/) due to trial end or limits **resume automatically**; locked providers become available instantly.
- A scheduled downgrade is cancelled by an upgrade.

## Downgrade — takes effect at period end

- The smaller plan becomes active **at the end of the current billing period**; until then you keep the full scope.
- You can **revoke** the scheduled switch any time before the cutoff.
- If you then have more syncs or accounts than the new plan allows, the surplus ones are **paused** (not deleted).

## Cancellation — takes effect at period end

- Cancellation also applies **at period end** — everything runs normally until then, and you can **undo** it any time ("Reactivate").
- Afterwards the account switches to **Free**; syncs beyond the Free limit are paused, nothing is deleted.
- You can re-subscribe any time later — everything continues as configured.

## Invoices & taxes

- Invoices are available as **PDF** under Settings → Billing.
- Stripe calculates VAT automatically for your country. For businesses: billing address and VAT ID can be entered at checkout.

Billing questions, special cases, consolidated invoices? [Contact us](https://docs.kalender-sync.de/en/troubleshooting/contact-support/).