---
title: "Calculate prorated supplier discounts"
description: "This example concerns a prorated group-level discount defined for quantity tiers."
lang: en
languages:
  en: https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-discounts/maintain-supplier-discounts-overview/calculate-prorated-supplier-discounts/index.md
lastmod: 2026-02-19
---

> Documentation index: https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-discounts/maintain-supplier-discounts-overview/llms.txt


# Calculate prorated supplier discounts

Last modified February 19, 2026

> This example concerns a prorated group-level discount defined for quantity tiers.


## Introduction

It is possible to prorate discount series if you select the **Prorate discounts** check box in the [Supplier discounts (AP205000)](https://docs.vismasoftware.no/visma-net-erp/help/supplier-ledger/supplier-ledger-windows/supplier-discounts-ap205000/index.md) window. For prorated discount series, the discount amount (or the quantity of items) is calculated so that your company does not need to split a purchase order to get a greater discount amount or a larger quantity of items. The **Prorate discounts** option is applicable to discount series with discountable quantities as well as with discountable amounts.

### Example

The series defines the discount with the following tiers:

+ 10 units: 1 unit of the item
+ 20 units: 2 units of the item
+ 40 units: 3 units of the item

To determine the discount for a discountable quantity larger than one break point but less than the next break point, the system treats the discountable quantity as a combination of break point quantities, using the largest possible break point quantities. It then calculates the discount according to the breakpoints used.

With prorated discounts, a purchase order for 50 units would yield 4 units of the item, computed as 3 (for 40 units) plus 1 (for 10 units). For an order of 70 units, the discount is calculated as 6 units of the item: 3 as the discount for 40 units, plus 2 as the discount for 20 units, plus 1 as the discount for 10 units.


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