If trading and investing have possibility of earning so much, should one still get a salaried job?

Looking for certain income stability - better to get a job

If ok to bear the risks and fluctuations in income, then can consider just trading and investing

Not reliable to trade and invest as a job

I also wish to earn money via investing but I feel it's hard

Well unless you are doing it as your job, capital gains and dividends are not taxable income in Singapore. Employment income, business income, rental income etc are taxable income in Singapore. Why pay more taxes than necessary?

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