Retirement and additional income from sales of paintings

Hello,

I have been retired since 2019. I collect SS, and supplement with some retirement income payouts. Recently I started painting again (a hobby) and joined an art gallery. I have sold a few of my pieces, and sales taxes were collected. Now I am trying to figure out if I need to file a schedule C or what? I would say that my additonal  income from sales has been between $400-900/month since June. Please advise how/when I need to report sales. 

 

Thank you!

Kathy 

Turbo Tax user for many years!