When to go long or short
You go long when you expect the base currency to rise against the quote, and short when you expect it to fall. In both cases, define a clear stop-loss and target before entering.
Profiting from a falling market
Unlike owning an asset, in forex you don't need to hold the currency before selling it; you trade a contract on the price difference. This opens opportunities in both directions, but it does not reduce risk — shorting follows the same risk-management rules.
The structural reason runs deeper: since every price is a ratio between two currencies, every trade necessarily buys one and sells the other. "Selling EUR/USD" is not short selling in the equity sense — it is simply buying the dollar against the euro. Hence no borrowing, no stock-loan fees, and no short-squeeze risk as in equity markets.
The numbers in both directions
The two trades are arithmetically identical, as this table shows for one standard lot of EUR/USD (pip value $10), entered at 1.1000 with a 50-pip stop and target:
| Long (buy) | Short (sell) | |
|---|---|---|
| Entry | 1.1000 | 1.1000 |
| Stop-loss | 1.0950 (below entry) | 1.1050 (above entry) |
| Target | 1.1050 | 1.0950 |
| Profit at target | $500 | $500 |
| Loss at stop | $500 | $500 |
The general rule: profit or loss = pips × pip value × lots, with only the sign of the pips flipping. The one difference worth remembering is that the stop goes above entry on a short and below it on a long — reversing them is a common error that turns the stop into a target. Run your own numbers with the profit and loss calculator.
The one real asymmetry: overnight cost
If the arithmetic is symmetric, where does the difference actually lie? In the swap (overnight financing). Holding a position to the next day settles the interest-rate differential between the pair's two currencies: you receive interest on the currency you bought and pay it on the one you sold, with the difference credited or debited to your account.
The practical result is that the same pair can cost you in one direction and pay you in the other. A pair whose base-currency rate is clearly higher than the quote leans in the buyer's favour and costs the seller, and vice versa. This is negligible for a trade closed within the day, but becomes material in swing trading held for weeks — and can consume a meaningful share of a slow trade's target.
So read your broker's swap table before choosing direction on longer-term trades rather than after, particularly since many brokers charge three days of financing on one night of the week.