The specific share identification method allows investors to choose which investment is sold, which can be especially helpful when there are multiple lots purchased over time that each have a different cost basis, as advisors and their clients have the opportunity to identify exactly which shares to sell to get the best tax result. In the past, this strategy was implemented to maximize tax loss harvesting to minimize an individual's tax liability over time, although notably in today's world some advisors and clients are actually using it to ensure that long-term capital gains are harvested for those in the bottom tax brackets! Either way, though, specific share identification provided the planning opportunity, and in fact a popular feature of portfolio accounting and rebalancing software has been the ability to track and manage lot level accounting to optimize these decisions.
The rules for specific share identification were tightened up slightly in recent years, as 2008 legislation has been phasing in year by year that requires brokers and custodians to track the cost basis of newly purchased investments - so-called "covered securities" - and to report the results of sales to the IRS on a new Form 1099-B that provides information on not just the sales proceeds and sale date (as in the past), but also the cost basis, acquisition date, amount of the gain or loss, and character of the gain or loss (i.e., long-term or short-term). In addition, the new tracking rules effectively enforce the requirement that if advisors and their clients are going to use the specific share identification method, or otherwise want to set a favorable default method of accounting, it must be chosen by the time the sale occurs and the trade settles; otherwise, the lot selection is "locked in" and cannot be changed later.
In a new potential blow to the planning strategy, though, the latest 2014 Budget Proposal from President Obama would eliminate lot level accounting and the specific share identification method altogether, requiring instead that covered securities all be reported using the average cost method once they are held long enough to be eligible for long-term capital gains. Although some of the details remain unclear - most notably, whether the rules would apply only for stocks, or for mutual funds and ETFs as well - the bottom line is that the opportunity to make tax-savvy decisions about individual investment lots being sold may soon cease to be a value proposition for advisors and the technology that supports them!