Joint development (JDA) share calculator
Compare an outright purchase, an area-share joint development and a revenue-share joint development on one cost and revenue base. The calculator reports what the developer earns, what the landowner receives and — the number that actually allows comparison — the implied land cost of each structure.
Scheme and deal inputs
Security or non-refundable deposit under the JDA
Structure comparison
| Structure | Developer profit | Margin on cost | Implied land cost |
|---|---|---|---|
| Outright purchase | ₹6.34 Cr | 13.7% | ₹15.00 Cr |
| Area share — owner 35% | ₹2.66 Cr | 8.4% | ₹20.45 Cr |
| Revenue share — owner 30% | ₹5.19 Cr | 16.4% | ₹17.82 Cr |
On these inputs, Revenue share — owner 30% returns the highest margin on cost to the developer. That is an arithmetic ranking on one set of assumptions, not a recommendation: risk transfer, tax treatment, funding availability and the landowner's own preference all sit outside this comparison.
How each structure is modelled
GDV = saleable area × sales rate Outright purchase developer revenue = GDV land outlay = asking price Area share (owner s%) developer revenue = GDV × (1 − s) owner value = GDV × s land outlay = deposit; developer funds full construction Revenue share (owner s%) developer revenue = GDV × (1 − s) owner value = GDV × s land outlay = deposit; developer funds full construction For every structure: marketing = developer revenue × marketing % finance = (funded cost + land outlay) × finance % developer cost = funded cost + marketing + finance + land outlay profit = developer revenue − developer cost implied land cost = land outlay + (GDV − developer revenue)
Area share and revenue share produce the same arithmetic here at the same percentage, which is the point worth internalising: the headline percentages are not comparable across structures until you state who takes price risk and who funds what. Enter the two percentages you are actually being offered — they are rarely the same number.
Worked example
A scheme sells 81,120 sq ft at ₹6,500, so gross development value is about ₹52.7 crore. Development cost excluding land is ₹26 crore. An owner asking ₹15 crore outright is asking for roughly 28% of GDV. A 35% area share hands the owner about ₹18.4 crore of value — meaningfully more expensive than the cash offer, even after allowing for the ₹2 crore deposit under the JDA and the deferral of payment.
The JDA may still be the better deal: it removes a large day-one land payment, reduces peak funding and shifts part of the price risk. Those advantages are real, but they should be bought knowingly, at a quantified premium, not discovered afterwards.
What to work out next
- Residual land value calculator
Establish what the site supports before you judge whether a share offer is reasonable.
- For landowners
How to read a development offer against what your land can actually support.
- Construction cost calculator
Build the development cost that drives both sides of this comparison.
- Land feasibility
The full sequence from planning envelope to decision.
Frequently asked questions
- What is a fair landowner share in a joint development agreement?
- There is no universal ratio. A share is fair when the value the landowner receives is close to what the site would fetch outright, and the developer still earns a return that compensates for construction, funding and sales risk. That comparison is arithmetic, and it is exactly what this calculator performs — the commonly quoted city ratios are outcomes of past deals, not a rule.
- Is area share better than revenue share?
- They differ in who carries price risk. Under an area share the landowner takes units and therefore the market risk on those units; under a revenue share the owner takes a percentage of receipts as they arrive. At the same headline percentage they are not equivalent, because the developer usually still builds the owner's area under an area share while receiving nothing for it.
- Does the calculator include the cost of building the landowner's share?
- Yes. In both JDA structures the developer is assumed to fund the full construction cost while receiving revenue only on their own share. If your agreement splits construction cost differently, adjust the development cost input to the portion you actually fund.
- What is implied land cost?
- It is the total value the developer gives up to secure the site under each structure: any cash outlay plus the value of the revenue handed to the landowner. Expressing every structure this way is the only reliable method for comparing an outright asking price with a share offer.
- Are stamp duty, GST and TDS included?
- No. Joint development agreements have significant and structure-specific tax treatment in India, including GST on the transfer of development rights and on construction services, plus capital gains timing for the landowner. These materially change the outcome and must be modelled with your tax adviser for your specific agreement.
Take this from a calculator to a decision
A single-page calculator cannot phase a programme, model cash flow, compare structures on one base or freeze a report. DevPartner's deterministic engine does — with every assumption traced back to the value you entered.