How much can I save in a Help to Buy: ISA?
Up to £1,200 in the first calendar month and then up to £200 per month thereafter.
The limit does not roll over to the next month if no payment is made, to save any disappointment you could set up a monthly standing order.
If you make a withdrawal from your account you can only re-invest the funds in line with the monthly limits. This means it would take longer to save for your bonus or potentially you would end up with a reduced bonus.
The most you can save for a bonus is £12,000, although you can continue to contribute to the account after you've reach £12,000, but you won't earn any additional bonus.