Gone over cash ISA limit by accident - what to do?

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Paid 20k into cash ISA (Oct) and 4k into LISA (April) this financial year. Didn't realise they both count as cash ISAs for the 20k limit.
Shall I withdraw 4k from the cash ISA? Do I need to notify anyone? What about the interest earnt?
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You could inform your cash ISA provider but the guidance they are given is to do nothing as they do not have all the information and don't know what action HMRC will take. They are guided to advise you that HMRC may be in touch in due course. If HMRC do get in touch, it won't be until around this time next year at the earliest.
Anecdotally, it has been suggested that HMRC will let you off first breaches with a warning or overlook them entirely but that can't be guaranteed. However, don't worry there are no fines for ISA breaches. Where a breach is found and acted on by HMRC, the invalid ISA (the one that took you over your allowance) will be treated as though it were not an ISA and be taxed as any 'normal' savings account. HMRC will then direct the provider to 'repair' the ISA and the 16K of the deposit that is within your 20k allowance will be an ISA again, with the 4K that took you over your allowance taken out and returned to you. Again, all this will happen no earlier than around a year or so from now.
As already said the golden rule is that the £20K limit on new contributions in tax year, is a maximum total across all ISA's