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A risk-based trading system connects a return-generating strategy with explicit limits on position size, aggregate exposure, drawdown, execution, and rule changes. It should remain understandable during normal trading and enforceable during stress.

1. Define the strategy

Document the market, time horizon, setup, entry, invalidation, exit, and conditions in which the strategy should not trade. Estimate expectancy after costs and identify the evidence supporting it. Risk rules cannot compensate for an undefined or negative-expectancy strategy.

2. Define the account boundaries

Specify:
  • maximum planned loss per position;
  • maximum risk per trade idea;
  • maximum open risk across the account;
  • daily and weekly stop conditions;
  • maximum acceptable drawdown;
  • minimum capital or external breach threshold;
  • reserves for gaps, slippage, fees, and operational error.
For a prop account, document the exact daily reset, equity or balance basis, trailing mechanics, and restrictions.

3. Convert risk into size

Calculate each order from the allowed monetary loss and the distance to invalidation. Include contract value, currency conversion, spread, commission, and a slippage allowance. Round down to a permitted order size. Then test the order against symbol, factor, strategy, direction, and account-wide limits.

4. Write the execution policy

A professional policy answers operational questions before they occur:
  • Are orders rejected without a protective stop?
  • Can a stop be widened?
  • How are partial entries grouped?
  • What happens after a rejected order or disconnect?
  • When does trading stop for the day?
  • Which person or process can change a risk parameter?
  • How is automated trading disabled and restarted?

5. Predefine the drawdown response

A drawdown plan may reduce size, pause new risk, require data reconciliation, or trigger a formal strategy review. The trigger and recovery criteria should be defined before the drawdown begins. Do not treat the external breach threshold as the normal stopping point. Keep an internal margin for execution uncertainty.

6. Monitor process and outcomes separately

Track return, expectancy, drawdown, and slippage. Also track sizing errors, unauthorized changes, late stops, correlation breaches, downtime, and overrides. A profitable trade can still represent a serious control failure.

7. Govern changes

Change one identifiable element at a time, document the rationale, and define how it will be evaluated. Avoid altering the strategy or risk budget merely to recover a recent loss.

Position sizing models

Choose a sizing method that fits the account constraints.

Managing drawdowns

Build a precommitted response to adverse results.

Prop risk checklist

Apply the policy before, during, and after each session.

Risk-control tools

Explore monitoring and enforcement options.