Downtime is one of the easiest fleet costs to underestimate because it often appears in wages, rentals and missed work rather than the vehicle budget.
Count lost productive time
If a driver cannot work, the wage cost continues even though the vehicle is not earning.
Add replacement transport
Hire vans, taxis and short-notice rentals can be expensive.
Include customer impact
Late deliveries, cancelled visits and missed appointments can create costs that never appear on a repair invoice.
Track repeat offenders
A vehicle that looks cheap to keep may be expensive once repeated downtime is included.
Use downtime in replacement decisions
Reliability data can justify replacing a vehicle before maintenance spend alone appears excessive.
Keep the information current. Tax, vehicle and insurance rules can change. Check current official guidance or professional advice where a decision depends on a specific rule or figure.