You need to register for GST if:
Registration for GST would allow the business to claim the input tax credit. However, the business would have to charge GST on the sale of goods and services.
You can make an election by using Form GST74E or by using CRA online services to use the quick method. The Quick method of election cannot be revoked unless it has been in effect for at least one year. Election to revoke GST/HST must be made before the due date of filing the return for the last reporting period. The Election can be revoked by using Form GST74E or by using CRA online services.
You are eligible for 1% credit on the first $30k of your eligible supply at the time of calculating the net tax payable in each fiscal year.