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ISA - intra year profits and switching process
You're overthinking it. The ISA limit applies to the amount you invest into the ISA. In your example, £10,000. Whether that then fluctuates with performance is irrelevant. Even if you realise aprofit or a loss, nobody is watching it. You merely count the amount you originally contributed into the ISA wrapper. When they add up to £15,000; that's the limit reached. (And by the way, remember that only money going into the ISA is counted. It doesn't matter if you -let's say - put £15k in, then remove 10k. You've reached the limit. You don't again have the chance to put £10k 'back in'.