As a general matter, investors prefer long-term capital gains over ordinary income and, when faced with losses, short-term losses over long-term capital losses. Investors and tax professionals are constantly seeking to optimize their tax results, in part by seeking to assure the most favorable tax treatment available when trading. In some circumstances, such as those involving total return swaps, the IRS has simplified matters by predetermining a fixed percentage of gains and losses that are entitled to short-term or long-term treatment. The IRS has also adopted several rules in response to trades that generated tax benefits but that did not result in a change of economic position for the investor. In that regard, two presentations given as part of the 15th Annual Effective Hedge Fund Tax Practices seminar, co-hosted by Financial Research Associates and the Hedge Fund Business Operations Association, covered the fundamentals of the taxation of swaps and the tax treatment of wash sales, constructive sales, short sales and straddles. This article, the last in our four-part series covering the seminar, summarizes the key takeaways from those presentations. The first article in this series covered three sessions addressing contribution and distribution of property to fund investors, allocation of investment gains and losses to fund investors and preparation of Forms K-1. See “Hedge Fund Tax Experts Discuss Allocations of Gains and Losses, Contributions to and Distributions of Property from a Fund, Expense Pass-Throughs and K-1 Preparation at FRA/HFBOA Seminar (Part One of Four),” Hedge Fund Law Report, Vol. 7, No. 2 (Jan. 16, 2014). The second article discussed issues impacting foreign investors in foreign funds, including basics of withholding with respect to fixed or determinable annual or periodic gains, profits, or income (FDAPI); the portfolio interest exemption from FDAPI withholding; the pitfalls of effectively connected income (ECI) for offshore hedge funds; and the sources of ECI. See “Tax Experts Discuss Provisions Impacting Foreign Investors in Foreign Hedge Funds During FRA/HFBOA Seminar (Part Two of Four),” Hedge Fund Law Report, Vol. 7, No. 3 (Jan. 23, 2014). The third article addressed taxation of foreign investments, including withholding at the source, rules regarding controlled foreign corporations and issues concerning taxation of distressed debt investments. See “Tax Practitioners Discuss Taxation of Foreign Investments and Distressed Debt Investments at FRA/HFBOA Seminar (Part Three of Four),” Hedge Fund Law Report, Vol. 7, No. 4 (Jan. 30, 2014).