Changing from a Private Corporation to a CCPC. Can we switch for 2018 and going forward? What are the negative impacts this may have in the long run?

We are a small business, incorporated a few years ago.  Always selected private corporation on our business tax return but found that we meet all the criteria of a CCPC.  It would be an advantage for us to use the small business deduction but can we make the switch with no repercussion or penalties?  What are the disadvantages/negative impact this could have on our business?  Need a little guidance in making this decision.  Thanks.