Methodology
The calculation method rebuilds the bill from your tariff inputs, then compares the result with the actual bill.
- Verified usage = closing meter reading − opening meter reading. If both readings are omitted, billed kWh is used.
- Reading variance = billed kWh − verified usage.
- Energy charge = verified usage x tariff per kWh.
- Taxable base = energy charge + fixed charge.
- VAT or tax = taxable base x tax rate.
- Expected bill = energy charge + fixed charge + tax + arrears.
- Variance = actual bill - expected bill. Positive values suggest a possible overcharge.