Historically individual taxes were annual while some business taxes were quarterly. In Canada, corporate income tax is annual but sales tax remittances are quar

Historically individual taxes were annual while some business taxes were quarterly. In Canada, corporate income tax is annual but sales tax remittances are quarterly. The interest is favourable to government since it reduces the amount of debt it needs to carry for a time. Admittedly it’s small now but in the 80’s it was a very big deal. I admittedly have never ran payroll taxes for a business in the US so I don’t know how that in particular works. I do however know Milton Friedman came up with the idea of withholding while working for the government early in his career and he always claimed that it was motivated by interest.