---
title: "Advanced Billing"
description: "Advanced billing scenarios: services, periods, multiple tax rates, and more."
keywords: ["advanced billing", "services", "tax rates", "CAE"]
lastUpdated: "2025-01-26"
---

# Advanced Billing

For companies with more complex fiscal needs, Sarah includes **advanced billing** functionalities based on ARCA integration.

## Service billing

When billing services you must consider:

- Additional fields such as:
  - **Service date from/to**.
  - **Payment due date**.
- Different VAT treatments according to service type.

Sarah's advanced billing module handles:

- Calculating net amounts and taxes according to configured tax rates.
- Building structures required by ARCA (e.g., `FECAEDetRequest`).

## Multiple VAT rates

In some operations it's necessary to apply **more than one VAT rate** in the same invoice.

Sarah allows:

- Defining detail lines with different rates (21%, 10.5%, exempt, etc.).
- Generating corresponding VAT blocks in the ARCA request.

## CAE review and expiration

After issuing an invoice:

- The system stores the **CAE** and its **expiration date**.
- From the billing module you can:
  - View the current status of the receipt.
  - Reprint or download the PDF with fiscal data.