March is traditionally considered ‘ISA season’, when UK investors focus on their annual ISA allowance and are encouraged to ‘use it or lose it’. As we highlighted in our article last year, investment trusts within ISAs are an excellent way to benefit from the power of compounding over the long term, without worrying about the tax consequences of whether you are receiving capital gains or dividend income. Our analysis last year showed that the top ten compounding trusts – since Personal Equity Plans or PEPs (the precursor to ISAs) were first introduced – come from a very wide range of asset classes. We determined that the distinguishing factors between them were manager skill and the unique ability, afforded by the structure, for investment trust managers to truly invest with a longer-term horizon than the open-ended competition.