Auditing a 150-unit apartment complex in Oklahoma City that uses RUBS (Ratio Utility Billing System) to allocate the master meter bill to individual tenants. The allocation is based on square footage. But some units have window AC units and some have central air, some have electric stoves and some have gas. The allocation treats every unit the same. Is RUBS allocation ever actually accurate?
RUBS allocation — is it ever accurate?
RUBS is never perfectly accurate — it's an approximation. The question is whether the approximation is reasonable. Square footage is the most common allocation method but it ignores occupancy (a 4-person unit uses more than a 1-person unit), equipment differences (as you noted), and floor level (top floor units use more cooling). Some RUBS formulas weight for occupancy and equipment type. Check whether the formula being used matches what the lease specifies. If the lease says allocation by square footage, that's what it has to be, even if it's imprecise.
From an audit perspective, the key question isn't whether RUBS is perfectly accurate — it's whether the landlord is applying the formula correctly as specified in the lease. I've found errors in RUBS calculations where the landlord used the wrong total square footage, included common areas in the denominator, or applied the allocation to the wrong bill amount. The math errors in RUBS administration are more audit-able than the inherent imprecision of the allocation method itself.
Good distinction. I'll focus on whether the formula is being applied correctly rather than whether the formula itself is fair. Checking the math against the lease terms now.