TCTM04614 | Lifetime Individual Savings Accounts, and Help to Save accounts
From HM Revenue & Customs · Tax Credits Technical Manual
The Tax Credits (Definition and Calculation of Income) Regulations, Regulation 10, (2) Table 4, item 15
When calculating investment income, disregard the following:
The whole amount of the government bonus paid in respect of a Lifetime Individual Savings Account (Lifetime ISA).
The whole amount of the governement bonus paid in respect of a Help to Save account.