What if block period is a fy and not calendar year

Friends

We are aware that for LTA exemption under section 10(5) read with Rule 2B, the Block period of 4 calendar years is 2010 to 2013.

My seniors in my organisation are enquiring what would be the consequences if we follow block period starting from April to March of a FY in place of January to December of a calendar year as this is easy and eliminates many difficult situations.

I could not find any answer. Hence this post.

Regards,