For background, I'm an Ontario, Canada resident, and I've worked here during all of FY2016.
For the first time, in addition to mostly doing full-time work as an employee of a company, I did just over 5 months of work as an independent contractor. During this time, I made less than $30k providing services in the private sector; this means that I qualified as a small supplier under the CRA's definition, and that my registration for an HST number is voluntary. I do not have an HST number as a result.
With tax season right around the corner, I'd like to know what to look out for (which forms I should/shouldn't fill out, mostly) aside from the normal forms one would fill out when receiving their T4 slips from "normal" work done outside of independent contracts.