# CASE: access the number of a bookyear

**URL:** <https://community.silverfin.com/t/case-access-the-number-of-a-bookyear/1359>\
**Category:** Cases\
**Tags:** drops, drop\_period, use\_case\
**Created:** [January 22, 2019, 12:42pm UTC](https://community.silverfin.com/t/case-access-the-number-of-a-bookyear/1359 "2019-01-22T12:42:12Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![sven](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.silverfin.com/sven/32/1495_2.png) [@sven](https://community.silverfin.com/u/sven)\
**Post date:** [January 22, 2019, 12:42pm UTC](https://community.silverfin.com/t/case-access-the-number-of-a-bookyear/1359/1 "2019-01-22T12:42:12Z")

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From now on you can access the number of a bookyear by this code:

> ```auto
> {{ period.bookyear_index }}
> 
> ```

For Belgium tax calculations, this can be used as we sometimes need to know if the bookyear is part of the first 3 years of a company.

The index depends on the enddate of the very first book year (that’s defined in the panel Company Information of a company file)!  
If you are in the fourth bookyear, the output will be:

> 4