# Invoice splits / overlaps
This article describes how the "Neutralization of billing gaps and overlaps" setting works. You can change this setting on your dashboard in the *Settings > Calculation options*.
## 1. Invoice gap
An invoice gap corresponds to an interruption between two successive invoices of a subscription. This means that after an invoice expires, there is a period 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 hole.
## 2. Invoice overlap
An invoice overlap occurs when two invoices (usually for the same subscription or customer) cover periods that partially overlap. In other words, a new billing starts before the previous one ends, causing a temporal overlap.
## 3. Options in Fincome to fix these situations
To avoid these issues, 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, allow you to neutralize these scenarios and make your revenue metrics more reliable. By clicking on *"Neutralize gaps and overlaps",* you can:
* Neutralize overlaps only
* Neutralize gaps only
* Neutralize overlaps and gaps
{% hint style="danger" %}
These options will only work when the invoices causing a gap or an overlap are linked to the same subscription. \
Otherwise, for the rule to work, you will likely need to [connect the subscriptions](https://help.fincome.co/en/ajuster/connect-subscriptions).
{% endhint %}
