Most employers return any savings that occur to the employee; the travel allowance that expires will be converted into a (gross) contribution to the lease bike. For the savings on social charges The same applies. On average, an employer saves about €25 per month per employee in social security costs. In this way it is cost neutral for the employer and financially interesting for the employee. Lease a Bike has a white paper in which the social security costs savings are fully explained with sample calculations.
If an employer also has a budget to incur costs for the bike plan, an employer will on average make its own contribution of about €50 per month per employee.