Lifetime ISA The Lifetime ISA's Days Are Numbered: What the 2028 Replacement Means for Your £450,000 Cap and 25% Penalty The government wants to replace the Lifetime ISA with a new First-Time Buyer ISA by 2028, removing the 25% exit penalty but leaving the £450,000 cap in question. Here's what current and prospective LISA holders should actually do before then.