Practise ISA allowance calculations: splitting the GBP 20,000 annual limit across account types, LISA bonus mechanics, and tax-free growth.
Individual Savings Accounts (ISAs) are the UK's most important tax-efficient savings wrapper, allowing individuals to save or invest up to GBP 20,000 per tax year completely free of income tax and Capital Gains Tax. Understanding how the allowance works -- and how it interacts with different ISA types -- is crucial for effective personal finance planning. This drill covers three areas. First, splitting the GBP 20,000 annual allowance: you can hold multiple ISA types simultaneously and split the allowance between them in any proportion, subject to each type's own rules. For example, GBP 10,000 in a Cash ISA and GBP 10,000 in a Stocks and Shares ISA is allowed, but you cannot put GBP 15,000 in a Cash ISA and GBP 10,000 in a Stocks and Shares ISA in the same tax year (total exceeds GBP 20,000). Second, Lifetime ISA (LISA) mechanics: you can put up to GBP 4,000 per year into a LISA (which counts within the GBP 20,000 overall ISA allowance) and receive a 25% government bonus of up to GBP 1,000 per year. Third, tax-free growth: calculate the compound growth of an ISA over multiple years, understanding that all returns are completely free of tax. The exercises test realistic scenarios that UK savers face when planning their ISA contributions each tax year.
The ISA annual subscription limit for 2026/27 is GBP 20,000 per person, unchanged since 2017/18. This applies across all adult ISA types combined (Cash ISA, Stocks and Shares ISA, Innovative Finance ISA, and Lifetime ISA). The Junior ISA allowance is separate at GBP 9,000 per child per tax year.
You can contribute up to GBP 4,000 per tax year into a Lifetime ISA. The government adds a 25% bonus on your contributions, giving a maximum bonus of GBP 1,000 per year. The GBP 4,000 LISA contribution counts towards your overall GBP 20,000 ISA allowance, not in addition to it. You must be aged 18-39 to open a LISA, and you can continue to contribute up to age 49.
Yes -- since April 2024 you can open and contribute to multiple ISAs of the same type in the same tax year (this rule was relaxed). You can hold a Cash ISA, Stocks and Shares ISA, Innovative Finance ISA, and Lifetime ISA simultaneously and split your GBP 20,000 allowance between them in any combination, as long as the total contributions across all ISAs do not exceed GBP 20,000 in the tax year.
Any unused ISA allowance is permanently lost at the end of the tax year (5 April). Unlike pension annual allowance, ISA allowance cannot be carried forward to the next tax year. Each new tax year from 6 April you receive a fresh GBP 20,000 allowance. If you miss a year, you simply cannot reclaim that year's allowance in future years.
If you withdraw money from a Lifetime ISA for any reason other than buying your first home (property up to GBP 450,000) or reaching age 60 (or terminal illness), a 25% government withdrawal charge applies. Because the bonus is 25% of your contribution, the withdrawal charge effectively means you get back less than you put in -- for example, GBP 1,000 contributed becomes GBP 1,250 with the bonus, but a 25% charge on GBP 1,250 removes GBP 312.50, leaving only GBP 937.50.
Yes -- a Junior ISA (JISA) is available for children under 18 who are UK residents. It has a separate annual allowance of GBP 9,000 (2026/27), entirely independent of the adult ISA allowance. Only a parent or guardian can open a JISA, though anyone can contribute. The money cannot be accessed until the child turns 18, at which point it automatically becomes an adult ISA the child controls.
No -- all income, interest, and capital gains generated inside any type of ISA are completely exempt from UK income tax and Capital Gains Tax, regardless of the amount. This tax-free treatment is permanent: once money is inside an ISA wrapper it remains sheltered from tax for as long as it stays invested. This makes ISAs particularly valuable for long-term investors where compounding returns would otherwise attract significant tax.
Yes -- you can transfer an ISA to a new provider without losing the tax-free status. If you are transferring current-year contributions, the full current-year amount must be transferred. Previous years' ISA savings can be transferred in full or in part. Always use the formal ISA transfer process through your new provider -- never withdraw the money yourself and re-deposit it, as this would use up your current-year allowance and the original ISA wrapper would be lost.
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