Corpus fund calculator for redevelopment
Work out the corpus on a per-sq.ft basis — then see the number that actually matters: whether its interest can cover your new building's maintenance.
A redevelopment corpus fund is calculated by multiplying a flat's carpet area by the per-sq.ft rate the developer offers — for example, ₹500 per sq.ft on a 600 sq.ft flat gives ₹3,00,000. The real test in Mumbai is whether the interest the corpus earns can cover the new building's higher monthly maintenance, which is what this calculator checks for society members weighing an offer.
Calculate your corpus
Enter your numbers below — results update as you type. Nothing you enter leaves your device.
Use your new-flat carpet if you know it, otherwise your current carpet.
The per-sq.ft corpus the developer is offering.
New Mumbai towers commonly run ₹3.5–6 per sq.ft a month.
A safe fixed-deposit style return the society can earn.
These figures are an estimate to help you judge an offer, not a guarantee. Corpus norms, maintenance and interest rates vary by locality and project. Use this alongside the offer comparison tool, and have any final offer checked by your PMC, lawyer and chartered accountant.
Why does the corpus matter more than it looks?
When a society moves from an old three or four storey building into a modern tower, the running cost jumps. Lifts, water pumps, a fire-fighting system, common lighting, security and amenities all cost money to run every month — costs the old building never had. The corpus fund exists to cushion that jump: it is a one-time amount the developer pays so that members are not suddenly burdened with maintenance bills they cannot afford. Because it is meant to fund future outgoings, the right way to judge a corpus is not the headline figure but whether the interest it earns can cover most of your monthly maintenance. This calculator does exactly that.
How does the corpus fund calculator work?
- It multiplies your carpet area by the per-sq.ft corpus rate to give your total corpus.
- It works out the monthly interest that corpus can safely earn.
- It estimates your monthly maintenance in the new building.
- It then shows what share of your maintenance the interest covers — and how long the corpus alone would last if it were spent down.
Common questions
What is a corpus fund in redevelopment?
A corpus fund is a one-time lump sum the developer pays the society at the time of redevelopment. Its purpose is to help members meet the higher maintenance, property tax and outgoings of a modern building with lifts, pumps, fire systems and amenities that the old building did not have. It is usually calculated on a per-square-foot basis and paid into the society's account, where the interest it earns can be used to offset monthly maintenance.
How is corpus calculated per square foot?
Corpus is generally quoted as a rate in rupees per square foot, multiplied by the flat's carpet area. For example, a rate of ₹500 per sq.ft on a 600 sq.ft flat gives a corpus of ₹3,00,000. The right rate depends on the locality, the project's economics and how high the new building's maintenance will be. The real test is not the headline figure but whether the interest the corpus earns can cover most or all of your future maintenance.
Is a higher corpus always better?
A higher corpus is helpful, but it is only one part of the deal. A very large corpus offered alongside a weak developer, a low free-area, no bank guarantee or an unrealistic timeline can still be a poor bargain. Judge the corpus by whether it makes your new building genuinely affordable to run, and always weigh it together with the free area, rent, guarantees and the developer's track record.
Is the corpus fund taxable?
A corpus received by the society for the general benefit of members is commonly treated as a capital receipt rather than income, but the tax treatment can vary with how the agreement is drafted and whether it is paid to the society or directly to members. Because tax positions change and depend on facts, confirm the treatment for your specific case with a chartered accountant before signing.
Related tools & guides
- Offer comparison tool — weigh corpus against area, rent and guarantees
- Rent comparison tool — check the transit rent in the same offer
- Possession, OC & corpus guide — when and how the corpus is paid
Want your whole offer checked, not just the corpus?
Register your society for a free, plain-language review of the developer's full offer — no obligation.