marginal profit; gain from price difference
Refers to profit arising from the difference between buying and selling prices, or from favorable exchange rate movements. Common in business and finance.
Foreign exchange gains boosted this term's profits.
We make a profit from the margin between the purchase price and the selling price.
We made a profit from the yen's depreciation.
I made a profit from buying and selling stocks.
We booked a marginal profit this term.
差益 is a gain from a price or exchange-rate difference, while 差損 is the corresponding loss.
差額 is a neutral term for any difference in amount, whereas 差益 specifically refers to a favorable difference that results in profit.
exchange gain; profit on currency exchange
Compound of 差 (difference) and 益 (profit, benefit). The reading さえき is a standard on'yomi combination.