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About this tool
Split a housing society's monthly maintenance budget across flats by carpet area, equally, or on a hybrid basis.
The Society Maintenance Split Calculator takes a housing society's monthly expense budget and divides it across every flat, either equally, strictly per square foot of carpet area, or on a hybrid basis where you choose what proportion is recovered as a flat charge and what proportion follows area. It handles several flat types at once, adds parking charges per slot and an optional sinking fund percentage, and shows the per-flat bill alongside the total the society will collect. It is built for managing committees, treasurers and residents who want to check that the maintenance bill is arithmetically fair.
Open Society Maintenance Split Calculator on AltFTool — it loads instantly in your browser.
Enter 'Monthly common expenses (INR)' and pick a Split basis — Equal per flat, Per square foot of area, or Hybrid (part equal, part by area), which reveals a 'Share recovered equally' slider running 0 to 100% in 5% steps.
Under 'Flat types in the society' give each type a Label, Carpet area (sq ft), Number of flats and Parking slots per flat, using 'Add type' for more, then set 'Parking charge per slot / month (INR)' and 'Sinking fund (% on top of maintenance)'.
The 'Average monthly bill per flat' headline and the Flat type, Maintenance, Extras and Payable table update live; Copy result copies the rate per sq ft, the equal component, every per-flat bill and the monthly and annual collection.
Service charges are usually equal per flat while repairs and property tax follow area — the slider lets you model exactly that mix.
Add as many flat types as your society has, each with its own area, count and parking slots.
The per-flat amounts are derived from the budget, so the sum of all bills matches the budget to the rupee.
Co-operative housing society model bye-laws split it: heads like service charges, security, lift running and repairs to common property are recovered equally per flat, while property tax, water charges, sinking fund and expenses on repairs of the building are recovered in proportion to the area of each flat. Most societies therefore end up with a hybrid, which is what this calculator models.
Model bye-laws set the sinking fund at a minimum of 0.25% per year of the construction cost of each flat, excluding the land cost, decided by the general body. Many societies instead collect it as a simple percentage on top of the monthly maintenance, which is the option offered here.
GST at 18% applies to maintenance charges only when the society's annual turnover crosses ₹20 lakh and the charge per member per month exceeds ₹7,500. When it applies, it is levied on the whole amount for that member, not only the excess above ₹7,500.
Yes, but for Maharashtra societies a government circular caps non-occupancy charges at 10% of the service charges, excluding municipal taxes. Those are billed separately from the maintenance split shown here.
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