"Unavoidable costs" refers to expenses that cannot be avoided or eliminated. These costs are necessary and cannot be prevented even if one wants to minimize or eliminate expenses. Full definition
For some of us, these expenses are unavoidable costs of living. (thebettyrocker.com)
Unless the values in the funding formula (local or national) increase in line with unavoidable cost pressures, each and every school will feel the pinch. (schoolfinancialsuccess.com)
Schools have some basic unavoidable costs if they are to be safe, well run organisations. (schoolfinancialsuccess.com)