Working out each flat's service charge is the most common job a block director or treasurer does — and the one most likely to start an argument. This free calculator takes your total annual budget and splits it across the flats, either equally or by the percentages set out in each lease.
How service charge apportionment works
Your lease decides how the total service charge is divided. Some blocks use equal shares (every flat pays 1/n of the budget). Most use a fixed schedule — by floor area, by number of bedrooms, or a set percentage written into each lease. Always apportion by what the lease says, not by what feels fair.
How to use this calculator
- 1Enter the total annual service charge budget for the block.
- 2Choose equal shares, or switch to lease shares to enter each flat's percentage or weighting.
- 3Read off the annual, quarterly and monthly amount for each flat.
- 4Sense-check the total at the bottom — it should match your budget exactly.
What to do with the result
Use the per-flat figure to prepare your service charge demands and to present the budget at your AGM. Pair it with our free service charge budget spreadsheet and demand letter templates to issue clean, compliant demands.
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