Service-charge apportionment: an allocation you can explain

Start with the authority to allocate the cost

Before dividing a building expense, establish whether it can be charged, to whom and using which basis. The answer comes from the relevant agreements and local requirements, not from the fact that an invoice exists. Recoverability, consultation, presentation and timing rules vary. Use this guide to organize a calculation once the permitted approach has been established; it does not determine a resident's legal liability.

Record the period and the service being allocated. A cleaning invoice for one building should not enter the cost pool for an entire portfolio. Separate unrelated services when different groups benefit from them or different allocation rules apply. Keep the source invoice, approval and any adjustment together. This lets a reviewer understand where the total came from before asking why a particular unit received a particular share.

Define the participating units and their weights

Create a dated schedule of the units included in the calculation and the basis for each weight. Possible methods include equal shares, a specified percentage, floor area or a metered quantity. These are alternatives, not recommendations for every building. Use the method that actually applies and record its source. Do not silently switch to equal shares because it is easier to calculate this month.

Make exceptions visible. A unit excluded from a service, an agreed owner contribution or a change during the period needs an explanation. Check how vacant units and occupancy changes should be treated under the relevant arrangement. Keep the cost allocation to a unit separate from determining which party is responsible for that unit's charge. Otherwise, changing an occupant mid-period can accidentally change the building's total allocation.

Work through one complete example

Suppose an approved cost pool is 900 and the established weights for three units are 50, 30 and 20. The total weight is 100. The shares are therefore 450, 270 and 180. Check that those amounts add back to 900. This example illustrates arithmetic only: it does not establish that any particular cost or weighting is permitted for your property.

For a less tidy total, define a consistent rounding method in the smallest currency unit. Dividing 100 equally among three units produces a remainder after rounding. One reproducible approach is to calculate exact shares, round down to minor units and distribute remaining minor units in a documented order. Whatever approved method you use, retain the calculation and confirm that the allocated total equals the source total. Never leave a hidden difference in a balancing cell that nobody reviews.

Review before posting to resident balances

Prepare an allocation preview that shows the cost pool, period, weights, calculated shares and any exceptions. Ask a second person to check the source total and the participating units where your team size permits. Compare the result with the previous period, but investigate differences rather than assuming last month's numbers were correct. A large change may reflect a genuine bill increase, a missing unit or a duplicated invoice.

Only post charges after the calculation has been approved through your normal process. A draft allocation is not money received and should not be represented as a settled payment. When presenting a resident's charge, include enough context to explain the period and basis without sharing other residents' private financial records. Keep any questions linked to the relevant calculation so a future manager can find the answer.

Correct transparently and keep the calculation portable

If a cost or weight changes after posting, identify the affected calculation and use the appropriate correction or adjustment process. Retain the original figures, the reason, the reviewer and the replacement calculation. Rewriting the source total without a trail makes it impossible to explain why a resident's statement changed. Check whether the correction also affects a closed accounting period before entering it.

BuildingHQ can keep unit charges, expenses, attachments and account records together. Establish the applicable apportionment policy outside the software and verify that the available workflow represents it correctly; this article does not promise an automatic calculator for every lease structure. Keep an export of the calculation and source evidence with the period's records. Continue with the bookkeeping guide for reconciliation and with the landlord record-keeping guide for a filing structure that another person can follow.