Capital Lock-Up in Event Contracts
Definition
Capital lock-up is the period during which money used to buy an event contract is committed and earns nothing else. Because contracts are fully paid for, a trader's cash is tied up from purchase until they sell, merge or the market settles and pays. The longer the wait, the lower the annualized return on any given price, and the larger the cost of forgoing interest elsewhere.
Why it matters
Lock-up turns every event contract into a trade-off against holding cash or Treasury bills. A high-probability contract that settles in a year can return less than a money fund while carrying outcome risk. Investors should annualize the expected return to the determination date, not the event date, and compare it with what the cash would otherwise earn.
Common misconceptions
- •A 3% gain is not a good return if it takes a year.
- •The event date and the payment date can differ.
- •Holding rewards and interest are venue policies that can change.
- •The label is only a starting point. Investor outcomes usually depend on the governing documents, cash-flow priority, valuation policy, disclosure quality, and manager discretion surrounding the term, not just the shorthand definition used in marketing materials.
Technical details
Worked example: annualizing (Kalshi standard fees)
Buy 100 at $0.97: outlay $97.21; payout $100.00 if right; return 2.87%.
Resolves in one month: about 40% annualized.
Resolves in six months: about 5.8% annualized.
Buy 100 at $0.90 for six months: outlay $90.63; return 10.34%, about 21.8% annualized, with a much larger loss if wrong.
How investors apply the term
Investors usually apply this term by tying the definition back to the controlling documents and then asking which cash flows, rights, restrictions, or valuation assumptions it changes. A useful review looks at the term alongside fees, leverage, liquidity, reporting frequency, and manager discretion rather than treating it as a standalone concept.
The practical diligence test is simple: identify who benefits if the assumption is wrong, who has control when conditions change, and what evidence the investor receives after closing. Terms that cannot be reconciled to documents, cash movements, and monitoring data should be treated as marketing shorthand until proven otherwise.
Frequently asked questions
- How long is my cash tied up in an event contract?
- Until one of three things: you sell the position, you merge an offsetting pair where the venue allows it, or the market settles and pays. Settlement can come later than the event itself; Kalshi notes that some rules 'specify a determination time or date' later than when the event appears to end.
- Does a near-certain contract make a good return?
- Only if it resolves soon. Buying 100 contracts at 97 cents costs $97.00 plus a $0.21 Kalshi fee and pays $100 if right: 2.87%. Over one month that annualizes to about 40%; over six months to about 5.8%, which is comparable to cash yields and carries the risk of being wrong.
- Do I earn anything while my money is locked?
- It depends on the venue. Polymarket pays a holding reward, described as '4.00% annualized' on position value in eligible markets, 'variable and subject to change at Polymarket's discretion.' Kalshi's help article on its clearinghouse advertises '3.25% APY (variable rate, subject to change) interest on your holdings,' subject to eligibility requirements, and its member agreement, as read for AltStreet's Kalshi review, lets it invest member cash; check whether a given balance qualifies.