The Backsolve Method Explained: How Your Latest Funding Round Price Sets ESOP Strike Prices

The backsolve method valuation works backwards from the price an investor just paid for preferred shares. It finds the total equity value that makes that price fair, then allocates that value across share classes to arrive at the fair value of a common share. That common value, not the round price, is what anchors your ESOP strike price.

Founders often assume the Series A price is also the ESOP price. It is not, because investors buy rights that employees do not get. At MyValuation, the backsolve is one of the methods we rely on most for recently funded startups, because it ties the number to a real transaction.

Key Takeaways

• The backsolve method valuation solves for the total equity value at which the newest preferred share is worth exactly the price the investor paid.
  
• It is usually paired with the Option Pricing Model (OPM), which allocates equity value across share classes using a series of call options.
  
• The backsolved equity value is usually lower than post-money valuation, because preferred shares carry liquidation preferences that common shares lack.
  
• Common share value is then reduced by a discount for lack of marketability (DLOM) to reach fair market value.
  
• The method is most reliable when the round is recent, priced and at arm’s length. Insider, bridge and structured rounds weaken it.
  
• The result feeds the Ind AS 102 option value at grant. The tax FMV at exercise for unlisted shares is still certified separately by a Category I merchant banker.
  

What Is the Backsolve Method?

The backsolve method is a market approach that uses a recent financing round to infer the value of the whole company. Instead of building a forecast, it asks one question: what total equity value makes the new investor’s price fair, given the rights they received?

It is called “backsolve” because the model runs in reverse. A normal allocation starts with equity value and produces a per-share price. The backsolve starts with the per-share price and solves for equity value.

It is almost always run with the Option Pricing Model. The OPM treats each share class as a call option on the company’s equity, with strike prices set by liquidation preferences and conversion points. Our guide to the Option Pricing Model for startup valuation explains the allocation mechanics in detail.

Why Can’t You Use the Round Price as the ESOP Price?

The round price reflects preferred share rights that common shareholders and employees do not have. Using it for ESOPs overstates what an option on a common share is actually worth.

Typical preferred rights include:

• Liquidation preference: investors get their money back first in a sale or wind-up.
  
• Anti-dilution protection: their price adjusts if a later round comes in lower.
  
• Board and veto rights: control over key decisions.
  

Each of these has value. Multiplying the round price by the total share count, which gives post-money valuation, treats every share as if it carried these rights. That is why post-money valuation and backsolved equity value usually differ.

How Does the Backsolve Method Work Step by Step?

The backsolve runs in five steps. The worked example below uses illustrative numbers for an early-stage startup.

The setup

A Pune-based SaaS startup has 8,00,000 common shares held by founders. It has just raised ₹10 crore by issuing 2,00,000 Series A CCPS at ₹500 each. The CCPS carry a 1x non-participating liquidation preference and convert one-for-one into common shares.

Post-money valuation looks simple: 10,00,000 shares at ₹500 equals ₹50 crore. The backsolve tells a different story.

Step 1: Build the breakpoints

Breakpoints are equity values at which the payout pattern changes. Here there are two:

• ₹10 crore: up to this value, Series A takes everything through its liquidation preference.
  
• ₹50 crore: above this value, Series A is better off converting, at ₹500 per share, and shares pro rata with common.
  

Step 2: Set the OPM inputs

The example assumes a 3-year time to exit, 60% volatility based on comparable listed companies, and a 6.5% risk-free rate. These inputs drive the call option values at each breakpoint.

Step 3: Solve for total equity value

The model tests different total equity values until the Series A share is worth exactly ₹500. In this example, that happens at about ₹34.5 crore, well below the ₹50 crore post-money figure.

Step 4: Allocate to common shares

Series A receives ₹7.6 crore plus 20% of ₹11.9 crore, about ₹10 crore, which matches the ₹500 price. Common receives ₹15.0 crore plus 80% of ₹11.9 crore, about ₹24.5 crore. Divided by 8,00,000 shares, that is roughly ₹307 per common share.

Step 5: Apply the marketability discount

Common shares in a private company cannot be sold easily. Applying a 20% DLOM brings the fair market value to about ₹245 per share. That is the figure that supports the ESOP strike price, less than half the ₹500 round price.

When Does the Backsolve Method Fail?

The backsolve is only as good as the round behind it. It works best when the round closed recently, between unrelated parties, at a clean price.

It becomes unreliable in these cases:

• Insider rounds: existing investors pricing their own top-up may not reflect market value.
  
• Bridge or structured rounds: heavy discounts, warrants or unusual terms distort the headline price.
  
• Stale rounds: if the round is roughly a year old or more, the business has likely moved on.
  
• Material events since the round: a lost key customer or a big new contract changes value.
  

When the round is weak, valuers often weight the backsolve alongside another method, such as a DCF or the Probability Weighted Expected Return Method (PWERM), rather than relying on it alone.

How Do Indian Rules Use the Backsolve Result?

In India, the backsolve output feeds more than one compliance requirement. Each has its own purpose and signatory, so one number rarely covers everything.

Ind AS 102 grant-date fair value

Under Ind AS 102, companies expense ESOPs at their grant-date fair value. The backsolved common share value is a key input into the option pricing model used for that fair value. Our guide on Black-Scholes, Binomial and Monte Carlo models covers the option models, and our Ind AS 102 ESOP expense guide shows how the expense is booked.

Tax FMV at exercise

When employees exercise, the perquisite is taxed on the fair market value of the shares. For unlisted shares, that FMV must be certified by a SEBI-registered Category I merchant banker. A backsolve can inform that work, but it does not replace the merchant banker’s certificate.

US 409A for Indian startups with a US entity

If your company has a Delaware parent or US subsidiary granting options, the backsolve is also a widely accepted approach for a US 409A valuation. Our 409A valuation services cover that side of the structure.

What Are the Common Backsolve Mistakes?

1. Using post-money as the equity value. It ignores preferred rights and overstates common value.
   
2. Ignoring the cap table detail. Missing a share class or misreading a preference changes every breakpoint.
   
3. Picking volatility without support. It must come from a defensible set of comparable companies.
   
4. Skipping the DLOM. Without it, the common value is too high for a private company.
   
5. Backsolving to a bad round. Insider or structured rounds need cross-checks with other methods.
   
6. Reusing an old backsolve. After a material event, the old equity value no longer holds.
   

Conclusion: Getting the Backsolve Method Valuation Right for Your ESOPs

A backsolve method valuation turns your latest funding round into a defensible common share value by recognising what the investor actually paid for. Done properly, it gives an ESOP strike price that is lower than the round price, supported by a real transaction, and easy for an auditor to follow.

• Start from the latest priced, arm’s length round and check nothing material has changed since.
  
• Map every share class and preference before building breakpoints.
  
• Support volatility and DLOM with documented evidence, not round numbers.
  
• Keep the tax FMV separate and get the merchant banker certificate for exercises.
  

Get these right and your round price becomes an asset in your ESOP file, not a question from your auditor.

About the Author

Parth Shah is an IBBI Registered Valuer, US CPA and FCA. He advises Indian startups on ESOP and equity valuation, including OPM backsolves, Ind AS 102 option values and US 409A reports.

Frequently Asked Questions

1. What is the backsolve method in valuation?

It is a market approach that starts from the price paid in a recent funding round and solves for the total equity value that makes that price fair. That value is then allocated across share classes.

2. Why is backsolved equity value lower than post-money valuation?

Post-money valuation treats every share as preferred. The backsolve recognises that common shares lack liquidation preference and other rights, so their value, and the total, is usually lower.

3. Is the backsolve method the same as the OPM?

No. The OPM is the allocation model. The backsolve is a way of using the OPM in reverse to find equity value from a known preferred share price.

4. How recent must the funding round be for a backsolve?

There is no fixed rule, but valuers generally prefer a priced, arm’s length round that closed within roughly the last twelve months, with no material events since.

5. Can the backsolve be used for ESOP tax FMV in India?

It can inform the analysis, but for unlisted shares the exercise-date FMV must be certified by a SEBI-registered Category I merchant banker.

6. What DLOM is applied after a backsolve?

It depends on the company’s stage, expected time to exit and liquidity. The discount must be supported by a recognised method, not picked as a round number.

7. Can the backsolve be used for a 409A valuation?

Yes. It is a widely accepted approach for US 409A valuations of venture-backed companies with a recent priced round.

8. What happens if the latest round was an insider round?
The backsolve is weaker, because the price may not reflect market value. Valuers usually cross-check it with a DCF or PWERM and weight the results.