A Bonus with a Catch
The UK Lifetime ISA (LISA) offers a 25% government bonus on contributions up to £4,000 per year. For US expats, this 'free money' is considered taxable income in the US. Furthermore, like other ISAs, the LISA is not treaty-protected, meaning all interest and gains are taxable. If the LISA holds funds, the PFIC rules apply. Before opening a LISA, check the GOV.UK LISA rules for withdrawal penalties.
Reporting the Bonus
The 25% bonus should be reported as 'Other Income' on Schedule 1 of your Form 1040 in the year it is credited to your account.
LISA Math for Expats
The net benefit of a LISA for a US citizen is: $$Net\\ Benefit = (Bonus_{USD} + Gains_{USD}) - US\\ Tax_{Marginal}$$. LSI keywords include 'PFIC,' 'Form 8621,' 'Other Income,' 'Schedule 1,' and 'Foreign Account Reporting.' Because the UK doesn't tax the LISA, you cannot use Foreign Tax Credits to offset the US tax on the bonus. This often makes the LISA less attractive for US citizens than for UK nationals. Refer to IRS Schedule 1 instructions. Additionally, if you withdraw the money for a purpose other than a first home or retirement, the UK imposes a 25% penalty, which is *not* deductible on your US return. Ensure you understand the FCA guidelines on investment risks before committing funds to a Stocks and Shares LISA.