The shares of some Guernsey companies, mainly investment companies, are listed on the International Stock Exchange and local over-the-counter markets exist for trading in other shares. Considerable funds are available locally for venture capital and other investment opportunities. Once operational, it could be expected that a Guernsey-based enterprise would be capable of funding much of its own expansion out of higher levels of profit that will be retained. The effective tax deferral available to an increasingly profitable business from the preceding year basis of assessment to income tax will also assist the company's cash flow (see chapter 9 on taxation).

Bank borrowing is the normal form of external funding. The large British clearing banks are represented and many substantial overseas banks have also established in the Island. As Guernsey's currency is Sterling, rates of interest are the same as those prevailing in the UK. No investment incentives or grants are provided by the States of Guernsey nor is there any regional development aid available.

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