A Round Turn (RT) refers to the complete execution of a trade, meaning both the opening and the closing of a position.
When commission is charged per Round Turn, it means that:
A commission is applied when you open a trade, and
A commission is applied again when you close the trade
In other words, the total commission covers both sides of the trade.
How Does Round Turn Commission Work?
On commission-based accounts, such as ECN accounts, commission is typically charged per lot, per side.
For example:
If the commission is $3.5 per side, per lot,
You pay $3.5 when opening the trade and $3.5 when closing it
The total Round Turn commission would be $7 per lot
Why Is Round Turn Used?
The term Round Turn is commonly used to:
Clearly show the full cost of a trade
Provide transparent pricing
Help traders compare trading costs between different account types
Summary
A Round Turn simply means the full trading cycle — opening and closing a position — with commission charged on both sides of the trade.