Starting a side hustle, need to register SSM or not?

Technically, if you're carrying on a business in Malaysia, you're supposed to register with SSM, it's not really optional even for "small small". Good news is it's cheap and easy: a sole proprietorship (enterprise) registration is around RM30 to RM60 a year via the SSM EzBiz portal, and you can do it online. Why bother even if small? (1) It's legally required and the penalty for operating unregistered can be nasty if caught. (2) You need SSM to open a business bank account, which looks more legit to customers and separates your money. (3) Suppliers, marketplaces (Shopee/Lazada official), and B2B clients often ask for SSM. On tax: business income is taxable and you declare it under Form B (business) instead of BE (employment) with LHDN. You pay tax on PROFIT (revenue minus allowable business expenses like cost of goods, delivery, ads), not gross sales, so keep records and receipts. If your side income is tiny you may still fall below the taxable threshold after reliefs, but you should still declare. Register early, it's cheap peace of mind.