Deposits, withdrawals, and the fees that aren't spreads
Trading costs get measured in pips. The costs around the account get ignored.
Deposits by card, bank transfer, or e-wallet carry fees, conversion margins, or delays. Withdrawals do too. A broker with a tight spread but a 2 percent conversion margin on deposits and a fixed withdrawal fee may cost more than a broker with a wider spread and free transfers.
For a small account, a fixed withdrawal fee can be a large percentage of a monthly profit. Withdrawing weekly instead of monthly multiplies the cost.
Currency conversion is the hidden one. If the account is in USD and the bank is in euros, the broker's exchange rate applies, often with a markup of 0.5 to 1.5 percent.
Time matters too. Capital stuck in a pending withdrawal isn't working. Some brokers process within hours, others take days, and a few add friction when profits are large.
A spreadsheet of all non-trading costs over a year, summed and compared with trading profit, often yields a surprising figure.
Choosing methods with low fees, batching withdrawals, and matching the account currency to the bank can recover a few hundred dollars a year without touching the strategy.
Across last year, what did moving money in and out of the account add up to?