--- title: How to Handle Subscription Indexation When the Rate Is Not Yet Known description: When billing subscriptions on a quarterly basis, it is important to consider cases where the subscription indexation date does not align with the billing month at the beginning of the quarter. --- [Skip to content](https://support.zapfloorhq.com/knowledge-base/quarterly-billing-with-indexations#main-content) English Show submenu for translations [Contact us](https://support.zapfloorhq.com/knowledge-base/kb-tickets/new?hsLang=en) ![Avatar 8-1.png\]](https://support.zapfloorhq.com/hs-fs/hubfs/Avatar%20%208-1.png?height=40&name=Avatar%20%208-1.png) - [Default HubSpot Blog](http://blog.zapfloorhq.com/) - zapfloor Open main navigation Close main navigation - [Default HubSpot Blog](http://blog.zapfloorhq.com/) - zapfloor - English Show submenu for translations - [Contact us](https://support.zapfloorhq.com/knowledge-base/kb-tickets/new) - [Go to zapfloor.com](https://www.zapfloor.com/) [Go to zapfloor.com](https://www.zapfloor.com/) Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://support.zapfloorhq.com/knowledge-base?hsLang=en) 2. [Invoicing your customers](https://support.zapfloorhq.com/knowledge-base/invoicing-your-customers?hsLang=en) 3. [Indexation](https://support.zapfloorhq.com/knowledge-base/invoicing-your-customers?hsLang=en#indexation) # How to Handle Subscription Indexation When the Rate Is Not Yet Known ## When subscriptions are billed quarterly in advance, the indexation rate may not yet be known when the invoice is issued. In these cases, the indexation can be applied retroactively once the correct rate becomes available. When subscriptions are billed quarterly in advance, the indexation date may not align with the month in which the invoice is generated. As a result, the applicable indexation rate may not yet be known when the invoice is issued. For example, if a subscription is indexed in **August**, but the August subscription is invoiced at the end of **June**, the indexation rate for August may not yet be available. In this case, the indexation should **only be applied from August onwards** and should not affect the months before the indexation date. Once the indexation rate becomes available, you can **invoice the difference retroactively**. This ensures that the subscription amount is adjusted correctly from the indexation date and that the final billing accurately reflects the applicable rate.   - [Getting Started](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#main-content) - [Initial Setup](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#initial-setup) - [Initial Data Import](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#initial-data-import) - [First Use](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#first-use) - [White Label App](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#white-label-app) - [Contracts](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#contracts) - [Lead manager](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#lead-manager) - [Marketplace](https://support.zapfloorhq.com/knowledge-base/getting-started?hsLang=en#marketplace) - [My Center Settings](https://support.zapfloorhq.com/knowledge-base/my-center-settings?hsLang=en#main-content) - 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