Interactive Brokers has a real time margining system that will give a margin notification to any account that has less than a 10% margin cushion above the margin requirement. Although a TFSA account does not use margin, it is still at risk of a liquidation if your cash were to go negative due to fees, market data charges, etc. Therefore, a TFSA account may still receive a margin notification if their cash balance is low enough to warrant an alert.
Why did I get a margin notification if I have a TFSA account?
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How much do I need to deposit to become margin compliant?
What triggers a margin cushion notification and what should I do when I receive one?
Why am I receiving margin cushion notifications in my cash account, and what do they mean?
Can I receive Margin Cushion notifications even if I do not have open credit transactions or leverage, and what triggers these notifications?