I'd only look at income tax relief once I'm in the 11.5% tax bracket earning 80k and above per year.
But if you're considering topping up your CPF, do it because of the interest you earn and not for the income tax savings.
If you have just started work, let's say for only 6 months this year, you'll be earning approximately $26K (including a pro-rated AWS).
The default income tax reliefs are CPF relief and earned income relief.
With an earned income relief of $1K and CPF relief of $5.2K, your total reliefs add up to be $6.2K and that brings your chargeable income to $19.8K. You won't be paying income tax on that, so there's no need to top up your CPF.
Of course, if you have bonuses and the like, then the equation changes. Let's say you get a month's bonus. Then you will have $30K of income which will grant you $6K CPF relief. Your chargeable income will come in at $23K and the tax on that is....$60.
To reduce that $60 tax bill to $0, you'll have to top up $3000 (!!!) to your SA.
I highly doubt it is worth losing liquidity on $3000 to save on $60 of tax.
Of course, in the later years, when your income increases, the numbers will change again. You can ask again a year from now for 2020 and I'll crunch numbers for you :)
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