With the new ISA allowance screen being introduced this week, I understand that you can still transfer funds between 212 ISAs in the current tax year without affecting your allowance, and that previous years’ funds will soon need to be returned to the same ISA they came from.
However, please could someone confirm how current year withdrawals and replacements work? I’m inferring from the email and help article that the funds don’t have to go back into the same ISA.
The ISA rules haven’t changed, I think the aim for the change by 212 is to make it clearer.
If you withdraw 50k from an ISA held by provider A, the ISA rules allow you to redeposit within the same tax year when flexible.
Provider B would not know you have withdrawn 50k from provider A.
Trading212 are giving a clearer breakdown of what your current allowance remaining is (20k a year), and any additional “replaceable” funds if you have withdrawn more than the current year deposits.
This is the HMRC guide:
Roughly speaking most providers request when you withdraw, that replaceable funds go back to the same ISA. You could then transfer from cash to stocks or vice versa once done.
Another user can post if I’ve missed anything.
Hey, @JMH 
Dougal is right - ISA rules haven’t changed, but we’re making a few adjustments to the interface to provide a better breakdown.
Yes, there are no changes to that, and you can still transfer funds between your 212 ISAs without impacting your current allowance. For previous year funds that you withdrew, you still have until the end of the current tax year to return them. However, after August 4th, funds you withdraw from your ISA must be returned to the same account. For example, if you withdraw funds from your Stocks & Shares ISA, you have to deposit them back into the S&S ISA until the end of the current tax year, while so far you could deposit replaceable funds to either ISA.
Replacements up until August 4th will work the same way they have so far, meaning you can return the funds in either ISA. From August 4th onwards, the new logic will take place, and replacements will have to be returned to the ISA from which you withdrew the funds initially.