--- title: "Example of calculation rules for trading commissions, third-party fees, and margin financing interest in the US stock market" description: "Below are examples of the calculation rules for trading commissions, third-party fees, and margin financing interest in the US stock market.1. Example:Transaction DateDelivery DateMarketCurrencyStock codeSidePriceTrading VolumeTurnover11 July13 JulyUSUSDCGABuy3.703301,221.0011 July13 JulyUSUSDCGABuy3.7030111.0012 July14 JulyUSUSDCGASell3.603301,188.0012 July14 JulyUSUSDCGASell3.6030108.002. RateMarket" slug: "2yucafb" locale: "en" region: "hk" region_label: "Hong Kong" url: "https://longbridge.com/hk/en/support/topics/usmarket/2yucafb.md" updated_at: "2025-12-05T07:03:56.000Z" category: "usmarket" category_title: "US market" references: related: - title: "US Stock Short Selling (Securities Financing) FAQs" url: "https://longbridge.com/hk/en/support/topics/usmarket/dp0vs2.md" - title: "What's US Fractional Shares Trading?" url: "https://longbridge.com/hk/en/support/topics/usmarket/fractional-shares.md" - title: "Over the Counter Trading FAQs" url: "https://longbridge.com/hk/en/support/topics/usmarket/ut3usr.md" - title: "FAQs about changing the US stock settlement cycle to T+1" url: "https://longbridge.com/hk/en/support/topics/usmarket/mkavr8.md" - title: "Options Portfolio Margin FAQs" url: "https://longbridge.com/hk/en/support/topics/usmarket/portfolio_margin.md" --- # Example of calculation rules for trading commissions, third-party fees, and margin financing interest in the US stock market [Table of Contents](https://longbridge.com/hk/en/support/toc.md) Below are examples of the calculation rules for trading commissions, third-party fees, and margin financing interest in the US stock market. ## 1\. Example: Transaction Date Delivery Date Market Currency Stock code Side Price Trading Volume Turnover 11 July 13 July US USD CGA Buy 3.70 330 1,221.00 11 July 13 July US USD CGA Buy 3.70 30 111.00 12 July 14 July US USD CGA Sell 3.60 330 1,188.00 12 July 14 July US USD CGA Sell 3.60 30 108.00 ## 2\. Rate Market US Currency USD Charge (Based on transaction amount 0.0049 USD per share （Min. charge 0.99 USD） Online Trading Platform 0.005 USD per share （Min. charge 1 USD） Margin Interest 5.75% Settlement Fee 0.003 USD per share SEC Fees 0.0000229 \* trading amount, (Min. charge 0.01 USD) For sell order only Trading Activity Fee 0.00013 USD per share, (Min. charge 0.01 USD),(Max. charge 6.49 USD) For sell order only ## 3\. Rules **Commission / trading platform fee calculation rules:** Commissions are calculated separately **Margin Interest calculation rules：**No interest will be calculated before transaction is settled,Interest will be calculated after settlement completes **Lifetime commission-free rule:** The card will take effect the next day after activation, and the relevant market will be exempted from trading commission except for Pre-IPO trading. ## 4\. Calculation results ### Commission / trading platform fee Example: CGA stocks were purchased on 11 July, and two orders completed at different times are considered different orders. Each order will also be treated as separated trades and commissions are calculated separately. The calculation results are as follows: Transaction Date Delivery Date Market Currency Side Price Trading Volume Turnover Commission Platform fee 11 July 13 July US USD Buy 3.70 330 1,221.00 1.62 1.65 11 July 13 July US USD Buy 3.70 30 111.00 0.99 1 Example: CGA stocks were sold on 12 July, and two orders completed at different times are considered different orders. Each order will also be treated as separated trades and commissions are calculated separately. The calculation results are as follows: Transaction Date Delivery Date Market Currency Side Price Trading Volume Turnover Commission Platform fee 12 July 14 July US USD Sell 3.60 330 1,188.00 1.62 1.65 12 July 14 July US USD Sell 3.60 30 108.00 0.99 1 ### Third-party agency fees CGA stocks were sold on 11 July, and two orders completed at different times are considered different orders. The calculation results of third-party agency fees are as follows: Price Trading Volume Turnover Settlement Fee SEC Fee Trading Activity Fee Total of third-party agency fees 3.70 330 1,221.00 0.99 For sell order only For sell order only 0.99 3.70 30 111.00 0.09 For sell order only For sell order only 0.09 CGA stocks were sold on 12 July, and two orders completed at different times are considered different orders. The calculation results of third-party agency fees are as follows: Price Trading Volume Turnover Settlement Fee SEC Fee Trading Activity Fee Total of third-party agency fees 3.60 330 1,188.00 0.99 0.04 0.04 1.07 3.60 30 108.00 0.09 0.01 0.01 0.11 ### Margin Interest If the account cash balance is 0 as US dollar, means that allows you to borrow cash to purchase stocks.(Clients needed to meet margin requirements) Example: Buying CGA stock on 11 July, the settlement amount required for delivery on 13 July is: （1,221+1.62+1.65+0.99）+（111+0.99+1+0.09）=1,338.34。 Selling CGA stock on 12 July, the settlement amount required for delivery on 14 July is: （1,188-1.62-1.65-1.07）+（108-0.99-1-0.11）=1,289.56。 Date Cash balance Margin interest Remarks 11 July \- \- No interest will be calculated before cash is settled 12 July \- \- 13 July \-1,338.34 1,338.34\*5.75%/365 Interest will be calculated after settlement completes 14 July \-1,338.34+1,289.56 \-48.78\*5.75%/365 Interest will be calculated after settlement completes 15 July \-1,338.34+1,289.56 \-48.78\*5.75%/365 Interest will be calculated after settlement completes 16 July \-1,338.34+1,289.56 \-48.78\*5.75%/365 Interest will be calculated after settlement completes **Key takeaways:** - **Fee calculation**: Trading commissions are not aggregated. - **Margin financing interest calculation**: No interest is charged on undelivered trading; interest begins to accrue from the delivery day. - **Commission-free rule**: The coupon takes effect on the next day after being activated, and commissions for non-dark market trading in the corresponding market will be waived. **Disclosures** *This article is for reference only and does not constitute any investment advice.* --- > **Disclaimer**: This article is for reference only and does not constitute any investment advice. 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