Can I do a side hustle while having a full time job? Any legal issue?

Totally doable and common, but manage a few things. (1) Check your employment contract, many have a clause about outside employment, conflict of interest, or moonlighting, and some require you to declare or get approval. A side business unrelated to your employer is usually fine, but a competing business or using company time/resources is where you get in trouble, so keep them fully separate and never do side hustle during office hours or on company laptop. (2) Legally register the business with SSM (cheap sole prop online), being employed doesn't stop you owning a business. (3) Tax: your side income is taxable, declare it to LHDN under business income in addition to your employment income (your BE/B form), keep records of sales and expenses so it's painless. (4) Practically, protect your main job performance, don't let the hustle make you slack, that's what actually gets people fired. I ran a side biz for years alongside a job, no issue, just kept it clean, separate and declared. Confirm your specific contract clause and tax details, but generally you're free to build something on the side.

I do Shopee reselling on the side. Golden rule I follow: never touch it during office hours and never use anything from work. My contract had a 'no conflicting business' line so I made sure my side thing has zero overlap with my employer's industry. Registered SSM, keep a separate bank account for the biz, senang track and declare tax. As long as your day job KPI still on point, most bosses tak kisah what you do after 6. Just be discreet, no need announce to whole office.

The tax part trips people up. Once you have business income, you file it together with your employment income, and you can claim legit business expenses to reduce the taxable portion, so keep receipts. Also don't mix personal and business money, open a separate account from day one. On the employer side, if your contract is silent on side business you're generally free, but if unsure, a quiet read of the contract beats assuming. Keep the main job solid, that's your safety net while the side thing grows.