For wine enthusiasts, the terms vintage or inception year define excellence, and they are equally significant to tax practitioners trying to harvest tax losses. Though complex and frequently misunderstood because of its emphasis on losses, tax-loss harvesting offers the potential for significantly increased after-tax returns. It is a proven way of adding significant value to client portfolios on an after-tax basis, which is especially important for retirees on a fixed income. Yet, without a tax practitioner's ongoing client involvement and support, clients are unlikely to achieve the benefits of tax-loss harvesting. This article looks at the practice and offers tips to improve results.