Costco's comparable sales were higher by 8.4% across the company, or 5.4% when removing the effects of gas, inflation and foreign exchange. More From InvestorPlace 7 Great REITs to Own in Good Times and Bad 8 Companies That Could Disappear by 2019 10 Dividend Stocks to Buy With Low Yields, But Big Dividend Growth Compare Brokers The post Costco Wholesale Corporation (COST) Posts Earnings Beat on Tax Benefit appeared first on InvestorPlace . InvestorPlace - Stock Market News, Stock Advice & Trading Tips Costco Wholesale Corporation (NASDAQ: COST ) reported its latest quarterly earnings results after the bell Wednesday.