Customisation > select Rounding option > Save

Default Rounding is none. Select rounding based on your country's regulation. Also do consult your accounts department, and keep rounding consistent across all calculations. 

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Rounding Options

Rounding Options : None, round up and down to the nearest 5 cents, 10 cents, 1 dollar, 50 dollar, 100 dollar, 500 dollar, 1,000 dollar, 5,000 dollar, 10,000 dollar. 

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