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How does cash ISA & share ISA mix together
There are two different types of ISA; the "Cash ISA" for cash savings, and the "Stocks and Shares ISA" for stock market investing.  You can transfer funds between these two different types of ISA.  If your current cash ISA provider does not provide stocks and shares ISAs, then there may be a fee involved when transferring funds between two different providers. If I am reading your notation correctly, you have contributed the full allowance of GBP15,240 in both the current tax year and the previous tax year.   Each year you can contribute GBP15,240 (currently) to your ISAs and this can be done in any combination of cash ISA and stocks and shares ISA.  For example, you could put GBP5,240 into your cash ISA and GBP10,000 into your stocks and shares ISA. Regarding your questions : It is also important to understand that once you withdraw money from an ISA, it does not affect your previous contributions or allowances.  For example, if you have used your full contribution allowance for the current year and chose to withdraw some funds, then you have still used your full contribution allowance and so you cannot redeposit these funds.