The minimum investment depends on the type of pot that you have.
For ISA, general investment and pension pots, the minimum investment is £500.
For Lifetime ISA pots, the minimum investment is £100.
Why is there a minimum for these pots?
We aim to offer truly diversified portfolios. Investing smaller sums could result in a portfolio which is overly exposed to a particular asset class, making it incompatible with your investment goals.