Three years after moving into a new Bengaluru apartment, the owners faced a bill of several lakh rupees to overhaul the lifts and waterproof the terrace, and discovered there was almost nothing set aside to pay for it. The builder had long since moved on, the residents association had never been properly handed the money collected at possession, and each family now faced a sudden special levy. The funds that should have cushioned this, the corpus and the sinking fund, existed on paper but had never done their job.

The short answer. When you buy a new flat, you usually pay two kinds of money beyond the price: ongoing maintenance charges for day to day upkeep, and one time reserve funds, the corpus and sinking fund, meant for major future repairs and replacements. These reserves are not the builder's income; under real estate regulation the builder must keep them in separate accounts and hand over the balance, with accounts certified by a chartered accountant, to the residents association when maintenance is transferred. The trade off for a buyer is that a healthy, properly handed over reserve protects you from sudden special levies later, so it is something to verify at purchase, not discover at crisis.

What is a corpus fund, and what is a sinking fund?

A corpus fund is a one time reserve collected from buyers, usually at possession, and a sinking fund is the reserve a society uses for major repairs and long term needs. The corpus fund is a lump sum set aside as a permanent reserve for the building, often collected as a pre maintenance amount that is not part of the sale price. Once the society is formed, the corpus can feed the sinking fund, which is drawn on for significant work such as major repairs, structural strengthening, or eventual redevelopment, rather than for daily upkeep. The two are closely related and sometimes used loosely, but the idea is the same: money kept aside so that a large, occasional expense does not have to be met by a sudden demand on residents. For a buyer, these reserves are the building's financial shock absorber. The amount collected is often calculated by multiplying your flat's area by a per square foot rate the builder or the society sets, so a larger flat usually contributes more, and the total can range from a modest sum to more than a lakh of rupees per flat. Because it is a substantial one time payment made around possession, a buyer should know it is coming and understand that, unlike maintenance, it is not a recurring charge but a reserve meant to sit and grow for the years ahead.

How is maintenance different from these reserve funds?

Maintenance charges pay for the regular running of the building, while the corpus and sinking funds are reserves for major, occasional costs. Maintenance is the recurring money that covers security, housekeeping, common area electricity, lift servicing, water, and the salaries of staff, and it is collected periodically to keep the building running day to day. The reserve funds, by contrast, sit untouched until a big expense arrives, such as replacing a lift, repainting the whole building, or major plumbing work. Confusing the two is a common mistake: a society can have healthy monthly maintenance collection and still be unable to fund a large repair if its reserves were never built up or handed over. For a buyer, it is worth understanding both, because a low monthly maintenance figure means little if there is no reserve behind it for the expensive things that eventually break.

What must a builder hand over to the residents association?

A builder must hand over the balance of the reserve and maintenance funds, along with accounts, to the residents association when maintenance responsibility is transferred. Because the corpus and maintenance money is not the builder's income, the builder is expected to keep it in separate bank accounts and, at handover, transfer the remaining balance to the association together with a statement of accounts certified by a chartered accountant. This is a genuine protection: it means the money you paid is meant to follow the building into the hands of the owners, not disappear with the developer. The apartment owners in our opening example were hurt precisely because this handover was never done properly. For a buyer, the existence of separate accounts and a clean, certified handover is one of the clearest signs that a project has been run honestly, and its absence is a warning.

When and how is the residents association formed?

The residents association is formed to take over the running of the building from the builder, and real estate regulation makes forming it the promoter's responsibility. As a project is completed and flats are handed over, the owners come together into an association or society that then manages the common areas, collects maintenance, and holds the reserve funds. Under the regulatory framework, the promoter is required to enable the formation of this association within the prescribed time and to hand over the common areas and the funds to it. For a buyer, the practical significance is that a functioning, properly constituted association is what turns a collection of flat owners into a body that can actually manage money and repairs. A project where the association was never formed, or where the builder still controls the funds long after completion, is one where the safeguards have not taken effect.

Why do these funds matter to a buyer?

These funds matter because they decide whether a future major repair is met from reserves or from a sudden levy on your own pocket. A building with a healthy, properly handed over corpus and sinking fund can absorb the cost of a big repair without asking every owner for a large one time payment, while a building without such reserves passes that cost straight to residents when it arrives. This is why a low headline maintenance charge can be misleading, and why a buyer should look past the monthly figure to the reserves behind it. A well managed reserve is also a sign of a well run society, which protects the value and livability of your home over the years. Treating these funds as a boring line item is a mistake, because they are the difference between a predictable cost of ownership and an unwelcome surprise.

Reserve and maintenance funds at a glance

Buyers meet several fund related terms, so here is what each one is.

Reading across, the maintenance charge keeps the lights on, while the corpus and sinking funds stand ready for the expensive things, provided they were actually handed over.

What should a buyer check about these funds?

A buyer should check what is collected, where it is held, and whether the handover and association are in place. Work through these checks.

1. Ask what corpus and sinking fund amounts are collected, and on what basis they are calculated.
2. Confirm the maintenance charge and what services it covers, separately from the reserves.
3. Check that the builder holds the corpus and maintenance money in separate bank accounts.
4. For a ready or resale flat, ask whether the funds were handed over to the residents association.
5. Look for the chartered accountant certified accounts that should accompany a proper handover.
6. Verify that a residents association has been, or is being, formed for the project.
7. Read the builder buyer agreement and society bylaws for how these funds are governed.

Doing this tells you whether the building has a real financial cushion behind it, or whether you are, like the owners in our opening example, only one major repair away from an unexpected and avoidable demand.

Frequently asked questions

What is the difference between a corpus fund and a sinking fund?

A corpus fund is a one time reserve collected from buyers, often at possession, as a permanent reserve for the building. A sinking fund is what a society uses for major repairs, replacement, or redevelopment, and the corpus can feed it once the society is formed. Both are reserves for large, occasional costs, not for day to day maintenance.

Is the corpus fund the builder's money?

No. The corpus and maintenance money collected from buyers is not the builder's income. Under real estate regulation the builder is expected to keep it in separate accounts and, at handover, transfer the balance to the residents association with accounts certified by a chartered accountant. Misuse can attract penalties, so a clean handover is an important protection for buyers.

Who forms the residents association?

Forming the residents association is the promoter's responsibility under the regulatory framework. As flats are handed over, owners form an association or society that manages the common areas, collects maintenance, and holds the reserve funds. The promoter must enable this within the prescribed time and hand over the common areas and funds to the association.

Why should a buyer care about the sinking fund?

Because it decides whether a future major repair is paid from reserves or from a sudden levy on you. A building with a healthy, properly handed over sinking fund can absorb big costs without a large one time demand on residents, while one without reserves passes that cost straight to owners. A healthy reserve is also a sign of a well run society.

Check the handover paperwork alongside our guide to the difference between an occupancy certificate and a completion certificate, and vet the developer with our note on verifying a builder's track record and RERA complaints. If you are comparing projects, our overview of Amberstone Pride of JP Nagar shows what to ask about. These protections sit under your state's real estate regulatory authority.

Last updated 2026-07-13. PropNewz Team.