Your subscription invoice is designed to stay stable month over month. If it has changed, it's almost always because one of these has happened:
Salary change — always effective from the 1st of the next month
Equipment added or removed
Plan change — upgrade, downgrade, or add-on change
Statutory rate change — for example, a government-mandated change to social security contribution rates
Health insurance dependents added or removed, or a health insurance subscription updated to reflect the actual premium for the employee's age band
A new hire — your first month for a new employee may include a Pro-rata Invoice (covering the partial first month) before steady-state subscription billing begins
If your subscription invoice has changed and none of these apply, please contact your dedicated HR Manager — we want to make sure everything is correct.