# Distance travelled overages
Loopit has the capability to charge overages for each booking. For overages to be calculated a tracking device must be attached to a vehicle and successfully taking readings.
### How are overages calculated and billed?
If a booking has overages it is added to the *next* recurring invoice. For example if a booking has weekly billing:
* Invoice for 1st July to 7th July
* Customers allowance is 100km for the week
* During this period the customer travels 110km
* Invoice from 8th July to 14th July
* This invoice will include the charge for the 10km overages from the previous period.
{% hint style="info" %}
Note only readings from a telematic device are used for calculating overages
{% endhint %}
### How are swaps handled?
If a vehicle is swapped during a booking the usage allowance will be pro-rated for any partial billing periods. For example if a booking has 100km weekly allowance, the billing cycle is weekly and the customer swaps on day 5 of the weekly period a pro rata of (100km / 7 days \* 3 days remaining) will be added.
Any usage calculations require at least 2 readings from the same vehicle and same telematic device serial number. This means when a swap occurs the new vehicle must have a valid reading for the usage to start calculating.
### How do I see the usage in realtime?
An overview of the usages is available on the booking overview on the left side, this is for the current period.
To see detailed usage go to a booking and select "Distance travelled" tab.
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