Utility bill-back calculations are so opaque that tenants dispute them every month

In multifamily properties without individual meters, managers must allocate shared utility costs (water, gas, trash) to tenants using RUBS (Ratio Utility Billing System) based on unit square footage, occupancy, or some hybrid formula. Tenants receive a monthly charge with no breakdown of the master meter reading, the allocation formula, or how their share was computed. The result is that 10-20% of tenants dispute their utility bill-back every single month, each dispute consuming 15-30 minutes of manager time. This persists because RUBS calculations are done in Excel with no tenant-facing transparency layer, and utility billing vendors charge $3-$8 per unit per month — a cost owners resist when already paying the manager 8-10% of gross rent.