Maximum loss is the most you can lose on a position in the worst outcome, and on a fully paid event contract it is simply the amount you paid.
Last reviewed 20 November 2025 · Educational, not advice
Maximum loss is the worst case in money terms. It is the most you can lose on a position if everything goes against you. Knowing this number before you trade is one of the most useful habits you can build, because it turns a vague sense of risk into a clear figure. Instead of asking whether a trade might go wrong, you ask exactly how much you would lose if it did, and then decide whether that amount is acceptable.
On a fully paid event contract the maximum loss is easy to state. It is the amount you paid for the contract. A contract that settles at one dollar if an event happens and zero if it does not cannot fall below zero, so the worst that can happen is the contract resolves against you and is worth nothing. If you paid forty cents, your maximum loss is forty cents per contract. This capped downside is a defining feature of fully collateralised event contracts, and it is why the worst case is knowable in advance rather than open ended.
That cap depends on the structure, though, and it is not universal. In a margined market your loss is figured on the full size of the position, not just on the cash you put down, so you can lose more than your deposit. The clean rule that maximum loss equals what you paid holds for fully paid, fully collateralised positions, not for everything. Before you assume a capped loss, confirm that you are paying the full price of the contract rather than posting a margin deposit against a larger position.
A capped loss per contract is also not the same as safety. Two things make this important. First, many contracts really can go to zero, so a capped loss is still a complete loss of what you paid on that trade. Second, losses add up across positions. Many small maximum losses, taken together, can become a large total loss. The cap protects you on a single contract, not across a whole account or a run of trades. This is why maximum loss works hand in hand with position sizing, deciding how large each position should be, and with your wider exposure, the total you have at risk. Work out the worst case first, size so you can live with it, and remember that a known downside is still a real one.
Suppose you buy fifty fully paid contracts at thirty cents each, spending fifteen dollars. Your maximum loss on that position is fifteen dollars, because the worst case is they settle at zero. Now suppose you take ten such positions across the week, each with a fifteen dollar worst case. No single trade can lose more than fifteen, but the combined worst case across all ten is one hundred and fifty. The cap on one contract is clear, yet your total risk is the sum of them.
Illustrative only. Numbers are examples, not a quote or a prediction, and exclude fees. A capped loss applies to fully paid positions.
Knowing your maximum loss is useful, but a known loss is still a real one, and losses add up across many trades. A capped downside does not make a position safe. Prediction markets can lose you money. Stake only what you can afford to lose, never to chase a loss, and never on borrowed money. If it stops feeling like a free choice, step back. In the United States you can call or text the helpline on 1-800-GAMBLER or visit ncpgambling.org.
Maximum loss is the most you can lose on a position if the worst outcome happens. On a fully paid event contract, it is the amount you paid, because the contract can settle at zero but no lower. Knowing it before you trade tells you how much is genuinely at risk.
On a fully collateralised, fully paid contract, yes, your loss is capped at what you paid. In a margined market it can be more than your deposit, because losses are figured on the full position. Structures differ by platform, so confirm whether you are paying the full price before assuming a capped loss.
No. A capped loss per contract does not make a position safe. Many contracts can lose everything you paid, and many small losses across many positions add up. The cap tells you the worst case on one trade, not whether the trade is wise or likely to pay off.
Maximum loss is the worst case on a single position, and position sizing is deciding how large that position should be. Working out your maximum loss first lets you choose a size where even the worst case is something you can afford. The two ideas work together to manage risk.
The rules change fast. Get the changes that affect you, plain and current, not tips.
Independent. Every claim dated and sourced. No platform pays for its place.