Tomorrow's easing of lockdown restrictions will be at the forefront of many people's minds as they plan a mini-spending spree at their local shops. But canny investors among them will not have forgotten that a new opportunity to invest tax-efficiently in the months ahead has just begun. One that should be used – despite the lure of the high street – especially if they are keen to continue to build long-term wealth free from the clutches of the taxman. I'm referring to the Individual Savings Account. Last Tuesday – April 6 – heralded the beginning of the new tax year and with it came a brand new Isa allowance for investors to use (or not).