---
title: "Following subscriptions"
description: "This article explains how to add a subscription that follows the invoicing period of an existing one, so both renew on the same date and are charged on a single invoice."
url: https://www.fenerum.com/en-DK/docs/billing/subscriptions/following-subscriptions/
updated_at: "2026-09-11T09:00:00"
---
When a customer buys a second product halfway through a billing period, a **following subscription** keeps them on a
single invoicing cadence: its first period is charged prorated up until the followed subscription's next renewal, and
from that renewal onwards both subscriptions renew on the same date and are charged on a single invoice.

## How it works

- The new subscription renews on the same date as the one it follows.
- Its first period runs from its start date until the followed subscription's next renewal and is charged prorated by
  the number of days, like other partial-period charges in Fenerum.
- To keep the two aligned, only plan terms with the same billing frequency and currency as the followed subscription
  can be chosen.
- Collection method, payment terms, pre-renewal invoicing configuration, and PO number are copied from the followed
  subscription, and _group on invoice_ is enabled on both — this is what makes them share an invoice (see
  [group subscriptions](https://www.fenerum.com/en-DK/docs/billing/subscriptions.md#group-subscriptions)).

## Adding a following subscription

You need the full access permission to billing, and the subscription you follow must use
[forward-charging](https://www.fenerum.com/en-DK/docs/billing/subscriptions/charging-options.md) plan terms, be active or scheduled, and still have a
future renewal — otherwise the option is not offered.

1. On the account page, click the **+** button on the subscription row, or click **Add following subscription** on the
   subscription's details page.

1. Fill in the form. The invoicing settings copied from the followed subscription are not shown.
1. Choose a start date within the current billing period of the followed subscription. If left empty, the subscription
   starts immediately — or, if the followed subscription has not started yet, on its start date (a full first period).
1. Check **First period** and **First period price** in the preview panel, then click SAVE. The prorated invoice is
   issued right away.

**Note: Changes after creation**

The usual grouping criteria still apply: if you later change the payment terms, PO number, or other grouping-relevant
settings on one of the subscriptions, they will be invoiced separately.

## Example

A customer subscribes to _Standard_ (DKK 310/month) on January 1. On January 15 they buy _Extras_ (DKK 300/month) as a
subscription following _Standard_:

- January 15: an invoice for _Extras_ covering January 15–31, prorated to DKK 164.52.
- February 1 and onwards: one invoice with both _Standard_ (DKK 310.00) and _Extras_ (DKK 300.00) for the full month.

---

## Navigation

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