Not sure how you managed to pay tax without a tax number, because Inland Revenue will have no reference to allocate your tax payments to.
We advise you contact Inland Revenue's customer care number 062-2091645/4 and ask if you have a tax number. If not then you will need to apply/register as a taxpayer. Please see our blog/article on how to register.
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We'll tell you when you need to file, along with tax tips and updates.