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The real costs of trading: spread, commission and swap

Author: پم ایران Published: Oct 6, 2026 2 min read 4 views

This post is also available in Persian ←

The real costs of trading: spread, commission and swap

The three main costs of every trade and how together they build your true cost — with the details that like to hide.

Trading costs are every strategy’s hidden tax: a strategy that is barely profitable on paper can turn negative under real costs. Computing all three costs draws the line between “thin profit” and “loss”.

Your net return = gross return minus costs. Know the three main costs so none of them stays hidden.

The three main costs

CostWhen?What to check
SpreadEvery tradeAverage or instantaneous? What happens at news?
CommissionPer trade or per lot“Commission-free” accounts usually carry wider spreads.
SwapOvernight holdsDecisive for long-term strategies.

The practical takeaway

Compute each broker’s triple cost for your own style; the cheapest spread for a scalper is not necessarily cheapest for a long-term trader. Follow the account and broker comparison in the broker list and the fees guide.

Frequently asked questions

Is a commission-free account better? Not necessarily; “commission-free” means the cost moved into the spread. Compute the sum of all three costs for your style.

Where does swap come from? From the interest-rate difference of the pair and the broker’s policy; it is decisive for multi-day positions.

Floating or fixed spread? It depends on style: a scalper likes low floating in calm markets; at news, fixed is safer but wider.

Where can I see my costs? In your own trading panel: the spread on the symbol, the commission in the account terms, the swap in the symbol specifications. For the full picture, add up the cost of one typical trading day of yours; that number is the basis for judging both strategy and account.

Summary

Your real cost = spread + commission + swap, in your trading style. The calculators in the toolbox help.

The three costs of every trade

  • Spread: the buy/sell gap
  • Commission: the explicit per-trade/per-lot cost
  • Swap: the overnight holding cost
  • Compute the sum of all three for your style
  • “Commission-free” means the cost moved into the spread

The cost and size calculators: See it.

Tags: #Brokers

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PAMM Iran Journal content is educational; it is neither investment advice nor a promise of returns. Financial markets carry a risk of losing capital — review track records and risk yourself before any decision.

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