There is a slight possibility that My Roadtax Store might call/email you so that they can provide a refund on road tax as there could be a slight discrepancy between the initial payment purchase and the payment requested by JPJ.
This is solely because of the following:
- Differences in vehicle categorization offered by JPJ (saloon vs non-saloon)
- Differences in road tax cost for engine capacity (CC) for your car make and model.