This describes how household electricity billing works in Ukraine; the details differ elsewhere. A familiar situation: you submit your meter reading on the 1st, the operator takes its own on the 2nd or 3rd, and the two do not match. It seems logical that last month should now be recalculated. Something else happens instead, and that misunderstanding is why the next bill looks strange.
The billing period is the calendar month
Household billing is tied to the calendar month, not to the day the meter was read. A reading submitted at the end of a month, or in the first days of the next one, counts towards the month that has ended. So "I send it on the 1st, for the previous month" is the normal procedure, not improvisation.
If no reading arrives in time, the operator bills by the average daily consumption of the previous period. That is not a penalty either — just a way to close a month with no data in it.
Whose figure counts
The operator periodically performs a control reading — someone looks at the meter directly. And if you have a smart meter that transmits remotely, the readings reach the operator automatically, and its figure is what the bill is based on. Yours, in that case, is a cross-check rather than the source of the calculation.
A discrepancy almost never means somebody made a mistake. Most often it is a matter of days: you looked at the meter on the 31st, the operator read it on the 3rd, and a little more accumulated in between.
Where the difference goes
Here is the part that matters. Last month's bill is not rewritten. The difference goes onto the next bill, as a separate line usually labelled "recalculation". It can go either way: if the operator charged more than the actual figure warranted, the next bill goes down.
No late-payment interest applies to a recalculated amount — you did not pay late, you paid on the data available at the time.
A worked example
On 31 August the meter read 4520; you submitted that, and August was billed from it. On 3 September the operator read 4535. The September bill will carry two lines: the ordinary September charge, and a recalculation for the 15 kWh that slid from August into September. The two-month total is the same — only the split between the months changed.
What to do about it
One practical conclusion: keep your own record of the readings. Then the "recalculation" line stops being a mystery — you can see which figure the operator started from, which one you started from, and whether the difference adds up. Without your own record there is nothing to check the bill against, and all that is left is to take it on trust or argue without evidence.
How this looks in Платіжка
The app keeps your own history of readings and amounts: for every month it stores what you entered and what was calculated from it. The readings of the most recently saved month can be edited once a corrected figure arrives. And for lines that follow no formula — a recalculation being exactly that — there is a manual-amount tariff: you type in what the bill says, and it lands in the history and the report alongside everything else.