Key takeaways

• Recurring billing automatically issues a real invoice at a fixed interval for a service that repeats.
• Each cycle is a complete invoice: it carries the same mandatory details as a one-off invoice.
• For B2B, these invoices fall under the Peppol mandate in force since 1 January 2026, in the Peppol BIS Billing 3.0 format.
• SEPA direct debit collects payment automatically; paired with recurring billing, it removes manual chasing.

Recurring billing, beyond the simple reminder

A software subscription, a maintenance contract, a fixed monthly retainer: as soon as a service repeats on a fixed cycle, recurring billing saves you from re-keying the same invoice every month. The principle is simple, but the stakes are not: each cycle must produce a complete, compliant invoice, not an internal note-to-self.

This is the most common confusion. A recurring invoice is not a payment reminder or an account statement: it is a full tax document, with its own sequential number, its date and its amount. The only thing recurrence automates is its production; it lightens no obligation.

This article explains how to set up recurring billing for your subscriptions, what each cycle must satisfy, and how to bolt on automatic collection. For the formal requirements of an invoice, see Mandatory invoice details in Belgium.

Manual or automated billing: what changes

Billing a subscription by hand stays workable while your customers can be counted on one hand. Past that point, monthly re-keying becomes a source of missed cycles, wrong dates and late collection. Automation does not change the nature of the invoice; it changes who triggers it and when.

What every recurring invoice must satisfy

Because it is a complete invoice, each cycle must meet the same requirements as a one-off invoice. Before automating, check that your recurring template ticks every box: whatever is wrong in the template will repeat at every cycle.

The baseline of a compliant subscription invoice

• Unique sequential number

  Each cycle gets its own number, with no gap or duplicate in the series.

• Correct dates

  Issue date and, where relevant, the service period covered by the cycle.

• Identities and VAT numbers

  Seller and customer identified, with their VAT number for a B2B transaction.

• VAT base, rate and amount

  A breakdown by applicable rate, as on any invoice.

• Structured electronic format

  For Belgian B2B, a Peppol BIS Billing 3.0 file sent over the Peppol network, not a PDF.

That last point is the most recent. Since 1 January 2026, the law of 6 February 2024 requires the structured electronic invoice for B2B transactions between taxable persons established in Belgium. A subscription invoice addressed to a business falls squarely within that scope: it must be issued in the structured format, no longer as a PDF. The exact calendar and scope are set out in Peppol in Belgium: the B2B mandate on 1 January 2026.

Setting up recurring billing, step by step

Automating a subscription comes down to describing the invoice once, then letting the software replay it at each cycle. The sequence fits into four steps.

1. 1

   Define the invoice template

   Step 1

   Service, amount, VAT rate, mandatory details: the template reused at every period.

2. 2

   Set the frequency and start date

   Step 2

   Monthly, quarterly or yearly, with the first cycle and, if needed, an end date.

3. 3

   Connect sending to the Peppol network

   Step 3

   The tool generates the structured invoice and sends it automatically to the customer's access point for B2B.

4. 4

   Bolt on collection

   Step 4

   Under a SEPA direct debit mandate, the collection triggers when each invoice is issued.

Automating collection too: SEPA direct debit

Producing the invoice is not enough; you still have to get paid without chasing. That is the role of SEPA direct debit. Based on a mandate the customer signs once, it authorises the automatic collection of the amount due from their account at each cycle. The invoice evidences the claim; the direct debit collects it.

For a subscription model, the benefit is twofold: payment follows the invoice with no action from the customer, and the rate of unpaid invoices drops compared with a transfer left to each person's initiative. It is also a direct lever against late payment, a subject covered in Reducing late payments.

Automate your subscriptions end to end

YouInv issues your recurring invoices in the Peppol BIS Billing 3.0 format, sends them over the Peppol network and triggers collection, with no re-keying.

Create an accountSee pricing

What it changes for your business

Recurring billing is no longer just a convenience: for B2B, it must produce structured, compliant invoices that can travel over Peppol. So the criterion for choosing a tool shifts. A simple recurring PDF generator no longer suffices; you need a solution that handles frequency, numbering, the Peppol format and, ideally, direct debit, in a single flow.

The right reflex is to check these four capabilities before you commit: configurable cadence, an invoice in the Peppol BIS Billing 3.0 profile, sending over the network and automated collection. Once that baseline is in place, a subscription is billed and collected without your having to think about it every month. For an overview of automation, read Automating your invoicing with YouInv.

Further reading

• Mandatory invoice details in Belgium: what each cycle must carry.
• Peppol in Belgium: the B2B mandate on 1 January 2026: the required format and the scope.
• Reducing late payments: reminders, direct debit and good practice.

The reference source on the format is authoritative: the Peppol BIS Billing 3.0 documentation published by OpenPeppol.

What is recurring billing?

Recurring billing means automatically issuing an invoice at a fixed interval (monthly, quarterly, yearly) for a service that repeats: a software subscription, a maintenance contract, a fixed monthly retainer. Each cycle produces a complete invoice, with its own number and date, not just a payment reminder.

Does recurring billing fall under the e-invoicing mandate in Belgium?

Yes. A subscription invoice is an invoice like any other. Since 1 January 2026, B2B invoices between taxable persons established in Belgium must be issued in the structured electronic format (Peppol BIS Billing 3.0) and sent over the Peppol network. Your recurring cycles follow the same rule.

What is the difference between recurring billing and SEPA direct debit?

Recurring billing produces the document (the invoice) at a fixed cycle. SEPA direct debit is the payment method that, based on a mandate signed by the customer, automatically collects the amount due from their account. The two are complementary: the invoice evidences the claim, the direct debit collects it.

How do you automate billing for your subscriptions?

You define an invoice template, a frequency and a start date in invoicing software. At each cycle, the software generates the invoice, sends it to the customer in the required format and, if a SEPA direct debit is in place, triggers the collection. You only step in for exceptions.

Must a subscription invoice carry the same details as a regular invoice?

Yes. Every recurring invoice must carry all mandatory details: a sequential number, dates, identities and VAT numbers, a description of the service, the VAT base and rate, and the total to pay. Recurrence waives no requirement.