> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.fincome.co/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Invoice gaps / overlaps

This article describes how the "Neutralization of billing period gaps and overlaps" setting works. You can change this setting on your dashboard in the *Settings > Calculation options* section.

## 1. Invoice gap

An invoice gap corresponds to an interruption between two successive invoices of a subscription. This means that after an invoice expires, a period elapses with no active billing before a new invoice begins. This case typically occurs in annual SaaS when the customer renews their subscription late, creating a temporary billing gap.

![Neutralization of gaps, billing period overlaps, setting, Settings, Calculation options, dashboard](https://storage.crisp.chat/users/helpdesk/website/-/9/3/5/d/935dcc68b0b03800/ab899762-8f74-4e00-a3b2-1b3015_19ez66r.png)

## 2. Invoice overlap

An invoice overlap occurs when two invoices (generally for the same subscription or customer) cover periods that partially intersect. In other words, a new billing period starts before the previous one has ended, creating a temporal overlap.

![Neutralization of gaps, period overlaps, billing, setting, Settings, Calculation options, dashboard](https://storage.crisp.chat/users/helpdesk/website/-/1/e/b/9/1eb91a3b3976fc00/d6bb8aa4-fc24-4759-8d25-0fe9ea_1hf3nv5.png)

## 3. Options in Fincome to correct these situations

To avoid these problems, Fincome provides specific calculation settings that automatically adjust the handling of billing overlaps and gaps. These options, accessible via Settings > Calculation options on your Fincome Dashboard, let you neutralize these situations and make your revenue metrics more reliable. By clicking on *"Neutralization of gaps and overlaps"*, you can:
* Neutralize only overlaps
* Neutralize only gaps
* Neutralize overlaps and gaps

||| These options will only work when the invoices generating a gap or an overlap are linked to the same subscription. Otherwise, for the rule to work, you will most likely need to [connect the subscriptions.](https://help.fincome.co/en/article/connect-subscriptions-8n69le/)