How to Generate Monthly Maintenance Bills for a Housing Society Without Errors

A standard maintenance bill includes: monthly maintenance charge (calculated per sq ft or as a flat rate), water and sewerage charges, housekeeping charges, lift charges, parking charges (if applicable), interest on late payment from the previous month, and any other approved charges (watchman fund, festival fund, etc.).

If the society is GST-registered, the bill must include the GST amount separately and be issued as a proper tax invoice with the society's GSTIN, the member's name and flat number, and the GST breakdown (CGST + SGST). A regular receipt is not a valid tax invoice for GST purposes.

The bill must clearly show: opening balance (outstanding from previous month), charges for the current month broken down by component, GST (if applicable), total amount due, due date, late fee rate, and the society's bank account details for payment.

In most societies, the maintenance charge is proportional to the flat's carpet area. A 1,000 sq ft flat pays double the maintenance of a 500 sq ft flat, assuming a per-square-foot rate. The per-square-foot rate is set by the managing committee at each AGM based on the total projected expenses divided by the total carpet area of all flats.

Some societies use hybrid billing: a fixed component (the same for all flats) plus an area-based component. This is more equitable when some charges (like watchman salary) are shared equally regardless of flat size, while others (like water charges) are proportional to occupancy.

When billing software is used, the area and bill configuration for each flat is set up once. Every month, the system calculates the exact bill for each flat automatically. Manual billing requires recalculating each flat individually, a process prone to arithmetic errors, especially for societies with 50+ flats.

Maharashtra bye-laws allow societies to charge interest on outstanding maintenance dues at a rate of up to 21% per annum (simple interest) on the overdue amount. The interest accrues from the due date (typically the 10th of the month) until the date of payment. The interest rate must be specified in the society's bye-laws.

Some societies offer a rebate for early or advance payment, typically 5–10% of the annual maintenance amount if paid before March 31. Rebates must be approved by the general body and clearly communicated to members.

In the monthly bill, the interest for the previous month's outstanding amount is shown as a separate line item. This is distinct from the principal overdue amount. Both must be tracked and credited separately in the member's ledger when payment is received.

A supplementary bill is a bill raised outside the regular monthly cycle for a specific charge, a special levy for a major repair, a one-time assessment for a capital improvement or an error correction to a previous bill. Supplementary bills are also used when a new member joins mid-year and requires a bill for the partial month.

To issue a supplementary bill, the managing committee must pass a resolution authorizing the charge, specifying the amount and the basis of calculation. The resolution should be communicated to all members before the supplementary bill is raised. Raising a supplementary bill without committee authorization is a bye-law violation.

Software like SocietyBee handles supplementary bills as a separate bill lot that can be generated and sent independently of the monthly billing cycle. The supplementary bill appears in the member's ledger and is tracked for payment separately from the regular monthly dues.