Forward-Start Options: Pay Now, Set the Strike Later

For educational purposes only; not investment advice.

Direct answer

A forward-start option is agreed and priced today, but its option period begins on a future date and its strike is set then—commonly as a percentage of the underlying price. Let t0 be trade date, T1 the strike-setting date, and T2 expiration. For a European Call with percentage strike α, the strike is K = αS(T1) and expiration payoff is max[S(T2) − αS(T1), 0].

The contract therefore buys exposure to the return from T1 to T2, not a fixed strike known at t0. It appears in structured products, compensation analysis, and reset or cliquet designs. It is commonly customized or embedded rather than a standard retail option-chain contract; the actual confirmation controls dates, averaging, dividends, adjustments, settlement, and counterparty or clearing terms.

Three dates and forward volatility

At t0, the parties fix the premium and rules but not the dollar strike. At T1, the reference price is observed under the contract’s method and the strike becomes known. Between T1 and T2, the activated option behaves according to its terms; at T2, it settles.

When α = 1, it starts at the money regardless of the level reached by T1. Under simplified scale-invariant models, value can be expressed as current spot times the value of an option on the future return interval. In practice, valuation depends on forward volatility between T1 and T2, skew and term-structure dynamics, jumps, rates, dividends, and the rule used to set S(T1). Today’s vanilla surface constrains—but does not uniquely determine—the future surface, creating material model risk.

A one-year-delayed, two-year Call

Assume one contract is purchased today with T1 in one year, T2 two years after T1, α = 1.05, multiplier 100, and a premium of $7.50 per share. Initial cash cost is $7.50 × 100 = $750.

If the stock is $80 at T1, the strike becomes 1.05 × $80 = $84. If it is $110 at T2, payoff is max($110 − $84, 0) × 100 = $2,600; net expiration result before fees, financing, and tax is $2,600 − $750 = $1,850. If the stock is $82 at T2, payoff is zero and the premium is lost.

The stock may be far above today’s price at both future dates yet the Call can expire worthless: what matters is the return after strike setting. Likewise, a low S(T1) does not create a free bargain because the strike resets in proportion.

Contract and valuation checklist

Identify t0, observation date T1, expiration T2, α, Call/Put, multiplier, exercise style, and settlement.
Define whether S(T1) is a close, opening value, average, or adjusted reference and what happens on a market disruption.
Separate pre-start exposure from post-start Delta, Gamma, Theta, and Vega; they are not constant through T1.
Calibrate to tradable vanilla Bid/Ask quotes across both maturities, then test alternative future-skew and forward-volatility dynamics.
Stress jumps at T1, dividends, rates, corporate actions, stale observations, model error, and hedge slippage.
For embedded sequences such as cliquets, model every reset, cap, floor, local return, and aggregation rule.
Verify whether the instrument is bilateral, dealer-issued, exchange-listed FLEX, or OCC-cleared; do not infer protections from its name.
Obtain independent valuation and realistic unwind terms; a theoretical value is not an executable exit price.

Common misconceptions

“It is purchased at T1.” The commitment and premium may occur at t0; only activation and strike setting are delayed.
“The future strike is unknown, so the contract cannot be priced today.” It can be valued from a model and market inputs, but the result carries model risk.
“It is a bet on the price from today to expiration.” Its core payoff measures the return from T1 to T2.
“An at-the-money forward start is cheap if the stock falls before T1.” The strike resets with the reference price.
“It is equivalent to waiting and buying a vanilla option at T1.” The future premium is uncertain; the forward-start contract locks terms and pays for that exposure today.
“A cliquet is one forward-start option.” A cliquet typically aggregates a sequence of reset-period option-like payoffs with additional caps, floors, or settlement rules.