Is it okay to hold a full time job but also register for a business as a sole-proprietor in Singapore?

Technically, that would be moonlighting. Having a 2nd job is almost always a breach of one's employment contract. This can be construed as misconduct, so your employer can let you go without notice, and there may also be grounds for the employer to claim damages from the employee for breach of contract.

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Of course, in practice, most people have a side hustle. As long as your side hustle isn't impacting your primary job, most employers will close an eye to it. After all, employer's can't control what you do in your own time.

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Here's a helpful guide on 3 easy steps to start a sole proprietorship in SG. If you're launching your own venture, don't forget to protect your company with business insurance so that you don't suffer large financial setbacks if something bad were to happen.

Is Ok, done that.

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The only issue is dont let your company know. Some company dont like staff to moonlight. Some manager will use it as an excuse to say you have bad performance, pay u less bonus. Nobody will know if you keep quiet.🤫