How to answer when you are asked for your previous salary?

You can consider saying that it is confidential and you're not at the liberty to divulge such information. If they need proof of employment, perhaps you can ask if you can simply provide a certificate of employment that doesn't state your pay.

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I'm not sure why hiring managers want to know such information, it could just be a standard HR practice. However, Josephine Teo has explicitly stated that employers cannot insist on jobseekers to declare their last drawn pay here: https://www.channelnewsasia.com/news/singapore/...