Around one in 20 investors are ISA 'early birds', making contributions to their individual savings accounts within the first two weeks of the tax year.
This is seen as a strategic move by investors to maximize tax efficiency from the outset, as acting early is one of the golden rules of investment, with the ISA season offering added tax benefits.
So those early birds are assumed to be among the most wily of all investors, or at least those who are the most keen to get maximum tax efficiencies.
The UK's largest investment platform, Hargreaves Lansdown, analysed ISA customer actions in the 2023/24 tax year, with one finding being that men are more inclined to make early ISA contributions than women.
According to the firm's data, while men constitute 62% of the firm's ISA clientele, they represent 68% of the early birds.
Age-wise, the most significant proportion of early investors falls within the 30-54 age bracket, followed by those aged 65-80. The data suggest that individuals in these age groups are particularly keen on leveraging ISAs to safeguard their investments against potential tax implications, such as reduced dividend and capital gains tax allowances.
Sarah Coles, the head of personal finance at Hargreaves Lansdown, said: "Early birds are set to flock to ISAs in the first two weeks of the tax year, protecting their nest eggs from the taxman as he lays waste to key tax allowances again overnight.
"As a general rule, the earlier you use your ISA allowance in the tax year, the more opportunity you have to save tax, and this year getting in as soon as possible is particularly valuable."
This coming tax year will see a halving of the dividend tax allowance to £500 and the reduction of the capital gains tax allowance to £3,000.
Coles said these changes underscore the importance of early ISA investments for avoiding tax liabilities on dividends and capital gains.