For those who are self-employed, purchase is usually more advantageous.
Leasing a bicycle as a self-employed person is not advantageous. Because you are not an employee, you lose the nice tax advantage that the government has provided.
In addition, you also pay for our top service that is intended to unburden HR. But for only your own bike, such a service is a cost from which you gain little benefit.
When you buy a bicycle, you benefit from recovering the VAT and writing off the expenses.
Talk to your accountant and bicycle dealer to see which smart solution they can advise you on.