Have a side hustle, do I need to declare the income and pay tax in SG?

Run a side freelance gig alongside employment, so I file this every year. Short answer: YES, income from your side hustle is taxable and you must declare it to IRAS, it does not matter that it is a side thing or paid to your personal account. Here is how it works. Your employer already reports your employment income (many are on the auto-inclusion scheme, so it pre-fills). Your freelance income is separate, it is trade/self-employment income and you declare it yourself in your tax return under the relevant section. Keep proper records: invoices, what clients paid you, and your allowable business expenses (software subscriptions, equipment, portion of relevant costs), because you are taxed on the NET profit, not gross, so legit expenses reduce your taxable amount. Keep records for the number of years IRAS requires. Practically: track income and expenses in a simple spreadsheet from day one, it makes filing painless. If your side business grows a lot you may need to think about GST registration thresholds and possibly a business registration, but at a few hundred to a thousand a month you are just declaring self-employment income. Don't skip it, IRAS can find undeclared income and the penalties are not worth it. Declaring is straightforward once you keep records.