Do You Know How CPF Interest Are Computed and Compounded? Hint: Not as straightforward as I thought - YouTube

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If you have checked your CPF account recently,  you would have noticed that your CPF’s interest  
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for last year has been credited to your  respective accounts by 1 Jan this year. 
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The computation of CPF’s interest is  not as straight-forward as I thought. 
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Continue watching this video to find out  how CPF’s interest are being calculated  
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and how you can use it to your advantage  when planning for any CPF transactions. 
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Remember to click the like and subscribe  button if you find the content useful. 
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Let’s start with the information from CPF’s  website which I will highlight the key points 
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• CPF interest is computed monthly. • It is then credited to your  
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respective accounts by 1st Jan of the  following year and compounded annually. 
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• contributions (including refunds) received  this month start earning interest next month 
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• And withdrawals/deductions in this month  will not earn interest from this month onwards. 
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If you are confused by what it really means,  
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watch on as I will explain step by step  how CPF’s interest are being calculated. 
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Let’s just look at an example on contributions  to CPF using the ordinary account  
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as the calculation will be the same for SA  and MA, except at a higher interest of 4%. 
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At the start of the year, on 1st Jan 2021,  Ken has $100K in his OA and his monthly  
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CPF’s work contribution to OA is $690. At the end of the month, i.e 31st Jan,  
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his OA balance will be $100,690. For month of Jan, his interest will be $208.33.  
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This is calculated by 2.5% (which is the  interest per annum for OA) *$100,000 /12 months. 
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You will notice that interest is being calculated  using $100,000 instead of $100,690 because per  
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CPF’s definition, contributions received this  month will start earning interest next month. 
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Another way to look at it is that interest  is calculated based on the lowest balance in  
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the month, which is $100,000 instead of $100,690. The starting balance in February will be $100,690.  
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Note that the interest from Jan is not  added because CPF interest is computed  
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monthly but compounded annually. Likewise in February, $690 is credited to his  
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OA account for work contribution and now the month  end balance on 28 Feb will be $101,380. February  
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interest will then be $209.77, calculated based  on the lowest balance of $100,690 in the month. 
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The same calculation repeats  until end of the year in Dec,  
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where the interest computed from each month  is being added up, which comes up to $2594.88 
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This interest is then credited to  OA account at the end of the year  
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before 1 Jan of the following year. Hence on 1st Jan the following year,  
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the starting OA balance will be $110,874.88,  
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taking into account the total interest  of $2,594.88 from the prior year. 
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For simplicity, I have not included the additional  1% interest for the first $60K in this example.
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We have seen how interest is computed in scenario  where funds are deposited to CPF accounts.  
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Let’s look at the reserve scenario when  funds are withdrawn from CPF accounts. 
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Using the same example, assume $500 was deducted  from his OA account in June, the interest earn  
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for the month of June will be calculated based on  the lowest balance in the month, which is $103,450  
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minus $500 which gives $102,950. The interest  earned for the month will then be 2.5% of this  
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amount divided by 12 months, which is $214.48. This is what CPF means by “withdrawals/deductions  
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in this month will not earn  interest from this month onwards.” 
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The interest calculation for the rest  of the year will be the same as before. 
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In Summary, there are three key take  aways on computation of CPF’s interest 
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1) Top up to CPF early in the  year to capture the most interest 
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2) If you are topping up funds to your CPF,  you can do it nearer to the end of the month,  
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since it is not going to earn you  interest until the following month 
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3) If you are withdrawing from your CPF, you  can withdraw it near to the start of the month,  
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since the withdrawal will be taken  into account in the current month. 
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I hope you find this information useful.  Remember to click the Like and Subscribe  
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button to support my channel. You can also visit my website at  
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www.investingtoolkits for more resources on CPF. Thank you for watching!