When you deposit your number plates at the Road Traffic Office, this is called suspension. During this time, insurance coverage is dormant and you won't have to pay the premiums for liability insurance.
In order to save themselves and their policyholders some administrative work, certain insurance companies offer the possibility of annual premiums for motorcycle insurance, which means that suspension is forgone. It becomes unnecessary to deposit the number plates for a few weeks or months during the winter season because these premiums take into account that motorcycles are used very little during the winter months.
If you do not use your motorcycle in winter, this option might pay off for you. The annual premium is lower – and you won't have to bother depositing the number plates.