Direct answer
Lowering your forex risk percentage on TD Ameritrade (or any brokerage) is mainly about choosing a smaller position size so that the expected loss—defined by your stop distance—stays at a lower percent of your account. A key limitation is that the “risk percentage” is not automatically set by the broker; you control it through position sizing and your planned exit levels.
How it works (mechanics of fixed percentage risk)
“Fixed percentage risk” means you decide a target percentage of your account you are willing to lose if the trade moves against you. The calculation is typically done in dollars:
- Account value: the equity you base the percentage on.
- Risk percent: your chosen fraction of that account (for example, 1% instead of 2%).
- Dollars at risk = Account value × Risk percent.
- Stop distance: the price movement from entry to the planned stop.
- Position size is then set so that the loss at the stop equals the dollars at risk (or less).
To lower your forex risk percentage, you generally have two independent levers:
- Reduce the risk percent you are willing to lose (choose a smaller percent).
- Reduce position size so the stop-out loss maps to the smaller dollar risk.
Even if TD Ameritrade software shows ticket-based order settings, the risk percentage concept still comes from your risk rule: the broker executes orders, while the trader defines how much of the account is risked through the planned stop distance and sizing.
Example checks you can do without platform-specific assumptions
Here are verification steps that help you confirm the risk percent you intend is the risk you’re actually controlling:
- Recalculate dollars-at-risk from your chosen percent using your account value baseline.
- Compute the loss at your planned stop using your instrument’s price move and the position size you plan to enter.
- Confirm the mapping: loss at stop should be approximately equal to (or lower than) dollars-at-risk.
- Scenario check: if stop distance changes (for example, wider technical levels), recompute position size so the risk percent does not drift.
Relevant limitations and risks
- No real-time guarantee: risk percentage depends on your inputs (account value baseline, stop distance, and position size). If any input changes, the percent can change.
- Market execution uncertainty: slippage and execution differences can cause actual loss to differ from the planned stop-based estimate.
- Instrument complexity: forex contract specifications and quote conventions can affect how price movement translates to profit or loss, so the mapping must match the specific instrument you trade.
Optional next step: use a fixed percentage risk explainer
If you want a broader, provider-agnostic overview of the concept, you can use the fixed percentage risk explanation page to ground the definition and the role of position sizing in controlling risk percentage: fixed percentage risk.
What this does not do
This explanation does not provide a trade call, a profit promise, or a guaranteed method to reduce losses. It only clarifies the decision mechanics behind a lower risk percentage and how to verify that your planned risk rule stays consistent.