SEIS stands for Seed Enterprise Investment Scheme, which is a UK government scheme that provides tax incentives to individuals who invest in small, early-stage companies. The scheme is designed to encourage investment in start-up companies and to help these companies raise finance.

Under the SEIS, investors can receive income tax relief of up to 50% on the amount they invest, subject to certain conditions. They can also receive capital gains tax relief on the sale of SEIS shares, as long as they hold the shares for at least three years. In addition, any gains made on the investment are free from capital gains tax.

To be eligible for the SEIS, companies must meet certain criteria, such as being a UK-based company with fewer than 25 employees and gross assets of no more than £200,000. The company must also be engaged in a qualifying trade, such as technology or creative industries, and cannot be involved in certain industries, such as property development or finance.

There are also limits on the amount of money that can be raised through the SEIS, with a maximum of £150,000 per year.

The SEIS can be a complex scheme, and investors and companies should seek professional advice to ensure that they are eligible and complying with all relevant rules and regulations. However, for eligible companies and investors, the SEIS can be a valuable source of funding and a way to access tax incentives that can help support business growth.