Work out each lot’s charges
Enter the amount to split and the ownership shares of your lots: you get each lot’s share, the quarterly charge demand and a table to export. The same calculation your managing agent makes — the one you can finally check.
What are you splitting?
An annual budget is called in quarterly; a works expense is the subject of its own charge demand.
The amount voted at the general meeting, all charges together.
Split in proportion to each lot’s share of the common areas.
The key total
The total the split is based on: 1,000, 10,000, or the total specific to the special key.
It appears at the top of the charge apportionment schedule annexed to the co-ownership rules.
Sum of the lots entered
10,000100%
The lots
Enter every lot to split the whole expense, or only yours to check your own share.
Apportionment
€24,000.00 to split
| Lot | Share | Per year | Per quarter | Per month |
|---|---|---|---|---|
| Lot 12,450 / 10,000 | 24.5% | €5,880.00 | €1,470.00 | €490.00 |
| Lot 22,100 / 10,000 | 21% | €5,040.00 | €1,260.00 | €420.00 |
| Lot 31,850 / 10,000 | 18.5% | €4,440.00 | €1,110.00 | €370.00 |
| Lot 41,750 / 10,000 | 17.5% | €4,200.00 | €1,050.00 | €350.00 |
| Lot 51,850 / 10,000 | 18.5% | €4,440.00 | €1,110.00 | €370.00 |
| Total | 100% | €24,000.00 | €6,000.00 | €2,000.00 |
How a condo service charge is calculated
The rule fits on one line and is the same across France: every co-owner pays in proportion to their ownership shares. What changes from one line to the next is the key that proportion applies to.
General charges
Preservation, maintenance and administration of the common areas: they are split in proportion to each lot’s share of the common areas, as set out in the co-ownership rules (article 10 of the act of 10 July 1965).
Special charges
Lift, collective heating, water: these are not split on the general shares but according to the objective usefulness of the service to each lot. A ground-floor lot with no access to the lift may be entirely exempt from that key.
The formula
Share = expense × (lot’s shares ÷ total shares for the key)
Example: a €24,000 budget and a lot of 2,450 shares out of 10,000 give 24,000 × 0.245 = €5,880 a year, that is €1,470 per quarterly charge demand.
Where to find your ownership shares
Three documents carry them, and they should agree. Where they diverge, the co-ownership rules prevail.
The co-ownership rules
Their descriptive schedule of division and charge apportionment schedule give, lot by lot, the shares for each key. This is the reference document, handed over at purchase.
Your charge demand
It usually restates your shares and the total of the key used. It is the quickest to consult — and precisely the one worth checking.
The accounting annexes
Attached to the meeting notice, they detail the budget line by line and the key applied to each. The condo board may ask the managing agent for them at any time.
Check your charge demand in four steps
An error in a charge demand does not show in the amount. It shows in the key.
- 1
Spot the key used
Every line of the demand states its apportionment key. A lift charge posted against the general shares is not a rounding difference, it is a mistake.
- 2
Check your shares
Compare the figure on the demand with the one in the apportionment schedule annexed to the rules. A figure that changes from one year to the next without a vote has no business being there.
- 3
Redo the calculation
Multiply the line’s budget by your shares divided by the key total. A few euros of difference is rounding; several tens of euros is something else.
- 4
Ask in writing
Where there is a gap, write to the managing agent quoting the line, the key and your calculation. A dated, costed request gets an answer; a phone call rarely does.
Five classic mistakes
They almost never come from bad arithmetic, but from the right formula applied to the wrong total.
Confusing general shares with a special key
This is the most common error. Lift, heating and water charges have their own share totals; splitting them on the general shares makes a ground-floor flat pay for a lift it never uses.
Believing apportionment can be changed by majority vote
Changing the apportionment of charges requires, in principle, the unanimous agreement of the co-owners, outside the cases provided for by statute (works altering a lot’s usefulness, division or merger of lots). A majority vote is not enough and risks being annulled.
Mixing the annual budget with works
The provisional budget is called quarterly, on the first day of each quarter unless the meeting decides otherwise. Works outside the budget are called separately, on the dates voted. Adding the two together makes any check impossible.
Forgetting the due date when a lot is sold
The co-owner on the day the charge demand falls due owes the money, not whoever occupied the lot during the period covered. Between seller and buyer, the split is settled at the notary’s office.
Withholding payment in order to dispute
Disputing an amount does not excuse you from paying it: charges remain due until a decision cancels them. Pay, then dispute in writing — the other way round exposes you to recovery proceedings and costs.
These tools are calculation aids, provided for guidance only. They replace neither your co-ownership rules, nor the minutes of the general meeting, nor professional advice: in case of disagreement, your building’s own documents prevail.
Frequent questions about condo service charges
Multiply the expense by your ownership shares divided by the total shares of the key concerned. For a €24,000 budget and a lot of 2,450 shares out of 10,000, the annual share is €5,880, called in four instalments of €1,470.
Your charges, tracked all year
This calculator answers one question. A condo board needs the rest: comparing actuals with the voted budget, finding the invoice behind a line, knowing which item overran before the meeting — not three days after it.
Budget against reality
Every voted item is tracked as spending comes in: the gap shows straight away, not when the annexes are read out.
Documents in the right place
Quotes, invoices and contracts are attached to the expense they justify, with their date.
A report ready for the meeting
The condo board presents figures that can be checked, each with its history behind it.
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