Yes, you can transfer funds from a Cash ISA to a Lifetime ISA, and your transferred funds will qualify for the government bonus. But make sure you don’t exceed the £4,000 yearly limit, since it counts as a Lifetime ISA payment.
As the payments you’ve made into your Cash ISA have already been counted in your overall ISA allowance of £20,000, the transfer won’t change the amount you have left of that. For more information, see our Transferring to a Lifetime ISA page.
To transfer a cash ISA to your Lifetime ISA, log into your account and in the 'My account' menu, click 'Transfers'.
You’ll need to fund your Lifetime ISA in the same tax year you open it – otherwise we’ll need to close it. So if you intend to fund your LISA by transferring in, it’ll need to complete before then end of the tax year.