
Thinkorswim's margin balance is a crucial aspect of trading, as it determines how much buying power you have in your account. The margin balance is the amount of money available to use for trading, and it's calculated based on the total value of your positions.
To maintain a healthy margin balance, it's essential to regularly monitor your account's equity and margin levels. This can be done by logging into your Thinkorswim account and checking the "Account Summary" page.
A margin call occurs when your account's equity falls below a certain percentage of the margin requirement, which is typically set at 25% for most accounts. This means that if your equity falls below 25% of the required margin, you'll receive a margin call.
Margin Balance and Trading
Margin balance is a crucial aspect of trading on Thinkorswim. You'll need a minimum of $2,000 to trade Forex on the platform.
Thinkorswim margin accounts offer competitive interest rates and flexible repayment terms, making it easier to manage your trading capital.

The margin balance on your account will be affected by the leverage you use. For example, with a maximum leverage of 50:1, you can trade up to $100,000 worth of currency pairs with just $2,000 in your account.
Here's a breakdown of the margin requirements for different currency pairs:
- EUR/USD: 3.33%
- Other currency pairs: vary depending on the size of the position, leverage used, and price of the currency pair
Remember, if your account value falls below the maintenance margin, you'll be required to deposit more cash into your account or liquidate your position.
Portfolio Margin
Portfolio margin is a method used to compute required margin for stock and option positions based on the risk of the position rather than fixed percentages. This approach can result in lower margin requirements compared to the standard method.
The minimum requirement to use portfolio margin is an initial net liquidating value of at least $125,000 in your account. Smaller accounts cannot be combined to meet this requirement.
Portfolio margin is only available for margin (non-IRA) accounts that have been approved to trade short, uncovered options. It's essential to note that using portfolio margin involves unique and significant risks, including increased leverage and shorter time frames for meeting deficiencies.
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A portfolio margin account must have a net liquidating value of at least $125,000, and smaller accounts cannot be combined to meet this requirement. This means you'll need a substantial amount of capital to take advantage of portfolio margin.
Here are the key requirements for using portfolio margin:
- Initial net liquidating value of at least $125,000
- Smaller accounts cannot be combined to meet the requirement
- Available only to margin (non-IRA) accounts
- Each account must be approved to trade short, uncovered options
Falling Below
Falling below the maintenance margin can be a huge problem for traders, especially those who don't have enough cash to stomach the volatility of the markets.
Your account value can fall below the maintenance margin in a matter of hours, depending on the margin requirements and the price movement of the contracts you hold. A 0.5% swing in the S&P 500 Index's value can happen all the time, translating into a more than 9% drop in value for your futures trade.
If the value of the contracts you hold declines, that amount comes out of your account at the end of the trading day when it's marked to market. Your broker will take that amount out of your account, leaving you with just $11,500 in this example, which is exactly the maintenance margin required for the contract.
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You'll be required to add more money to your account if the S&P 500 falls more than 23 points, or 0.5% in this example. The biggest risk is that you don't have enough cash to stomach the volatility, and your broker liquidates your position at a loss before your investment thesis plays out.
Thinkorswim Account Types and Funds
Thinkorswim offers various account types, including cash accounts, retirement accounts, and educational accounts. Each account type has its own unique features and restrictions.
Unlike a cash account, where you can only invest the funds you have deposited, a margin account allows you to borrow funds from the brokerage to invest more than your actual account balance. This can be a huge advantage for traders who want to increase their investment potential.
The initial deposit required to open a margin account is $2,000, which is also the minimum amount required to trade Forex on thinkorswim. This deposit allows you to borrow funds from the broker to trade Forex, but it's essential to have a sound risk management strategy in place to avoid significant losses.
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Comparison of Thinkorswim Account Types
Thinkorswim offers a range of account types to suit different needs and goals.
A cash account allows you to invest only the funds you have deposited, limiting your trading potential.
Retirement and educational accounts have specific tax advantages and restrictions, making them ideal for long-term investing and saving for specific goals.
Margin accounts, on the other hand, enable you to borrow funds from the brokerage to invest more than your actual account balance, making them suitable for more aggressive trading strategies.
Understanding the differences between these account types can help you choose the right one for your financial situation and trading experience.
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Differences in TOS Available Funds for Trading and Cash Sweep Vehicle
TOS Available Funds for Trading refers to the immediate balance of cash in your brokerage account that you can use for purchasing securities and covering debits for completed trades.
This balance typically includes cash deposits, proceeds from selling securities, and received dividends or interest.
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It's your readily accessible "trading fuel" within your account.
Cash Sweep vehicle, on the other hand, is a feature that automatically transfers any idle cash above a set threshold to a designated investment vehicle.
This "sweep" happens daily or at certain intervals, and the purpose is to earn some interest on your uninvested cash rather than letting it sit idle.
Common Cash Sweep vehicles can be money market funds, interest-bearing accounts, or even high-yield savings accounts.
The key difference between TOS Available Funds for Trading and Cash Sweep vehicle is that the former measures your available trading funds, while the latter measures your idle cash balance.
For example, if you have a credit option position that requires a margin collateral, TOS Available Funds for Trading may only require a fraction of the full amount to be restricted.
In contrast, Cash Sweep vehicle will show your entire idle cash balance, which may not change even if your trading funds do.
This means that you may see a difference in TOS Available Funds for Trading as the stock price of your positions changes, but not necessarily in Cash Sweep vehicle.
Here's a summary of the main differences:
- TOS Available Funds for Trading measures your available trading funds.
- Cash Sweep vehicle measures your idle cash balance.
- TOS Available Funds for Trading may require only a fraction of the full amount for margin collateral.
- Cash Sweep vehicle shows your entire idle cash balance.
Thinkorswim Trading Limits
The minimum amount required to trade on thinkorswim Forex is $2,000.
Thinkorswim offers a maximum leverage of 50:1 for Forex trading, which means traders can trade up to 50 times their account balance.
Each currency pair has a different margin requirement, which is the amount of money required to open and maintain a position.
The margin requirement for the EUR/USD currency pair is 3.33%, which means for a position size of $100,000, the margin requirement would be $3,333.
Traders should be aware of the margin requirements for each currency pair and the risks associated with using leverage.
Thinkorswim's powerful platform for Forex trading can be a valuable tool for traders who have a thorough understanding of the market, risk management, and trading strategies.
Related reading: How to Trade on Thinkorswim
Frequently Asked Questions
What does margin balance mean on TD Ameritrade?
On TD Ameritrade, a margin balance represents the amount of borrowed money, plus interest, that you owe to the brokerage. A negative margin balance indicates the amount you have outstanding, subject to interest charges.
Why is my margin balance positive?
A positive margin balance indicates you have excess cash or cash alternatives in your account, allowing you to trade without borrowing. This means you're trading with your own funds, not borrowed money.
Sources
- https://www.marginbull.com/news/thinkorswim-margin-account/
- https://toslc.thinkorswim.com/center/howToTos/thinkManual/Miscellaneous/Portfolio-Margin
- https://www.fool.com/investing/how-to-invest/stocks/futures-trading/how-much-money-do-you-need/
- https://seedly.sg/posts/what-are-the-difference-of-tos-available-funds-for-trading-and-cash-sweep-vehicle/
- https://www.forex.academy/how-much-do-you-need-to-trade-on-thinkorswim-forex/
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