You have up till 23:59:59 on the 5th April to invest in your IFISA at midnight it then becomes the 6th April and we move into the new tax year, which means your new ISA allowance starts.
Payments made to our bank account will be timestamped, so we can see when the money arrived and we can allocate it to the correct tax year.
For some payments, such as Mobile payments from a NatWest account, we might require you to send us proof of the time of sending the funds as we don't get a timestamp for these payments. If we do need this from you, we'll send a secure link to upload to.
Any money timestamped as the 6th April will be allocated to the new tax year and will count towards the new tax year's ISA allowance.