The utility sent a corrected bill, revised statement, rebill, adjustment, credit, or catch-up charge.
A corrected bill can combine old usage, new usage, credits, late fees, rate changes, and meter read corrections. Treating the whole amount as this month usage can lead to the wrong conclusion.
Check first
Find the corrected period, original amount, revised amount, credits, and new balance.
Check whether the correction came from an estimated read or billing setup error.
Separate current charges from past-due balance or catch-up charges.
Compare daily usage only for the corrected service dates.
Practical savings moves
Use meter-read tools if the correction is tied to actual usage.
Use payment-plan math if the corrected balance is too large at once.
Ask the utility which line items changed if the statement is unclear.
Keep copies of the original and corrected bills for comparison.
Avoid these mistakes
Do not treat a corrected balance as proof the current month got more expensive.
Do not ignore credits or reversals that lower part of the correction.
Do not miss payment due dates while waiting for an explanation.