For Singapore tax residents:
According to Inland Revenue Authority of Singapore (IRAS), interest income from loans to companies are taxable at progressive tax rates for Singapore tax residents. You must declare the interest income earned in the financial year, less any service fees.

For example, if you earned $500 in interest and $50 in late interest, but paid out $30 in service fees, you should declare a total of $520 interest income. 

To see your interests earned for any time period, click on your name at the top right hand corner and select "Statement" from the drop down banner. Select "Activity Statement" in Statement Type and enter the time period you wish to view your statement. Click on the "View Report" button to generate the report. 

In the screenshot below, after deducting $114.56 of service fees, this investor should declare a total of $3,506.85 interest income.

For non-tax residents:
Non-Singapore tax residents are subjected to withholding tax, which is 15% of interest earned, nett service fees.

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