The 2003 annual Continental Research report, which surveyed 500 UK firms, also found that nearly 20% of companies expect this increase to be "considerable".
Medium-sized businesses are driving the spending, with 25% of those surveyed saying they expect their online activity to increase "a lot" next year.
Colin Shaddick, director at Continental Research, said, "The enthusiasm of medium-sized businesses will help them experiment, while their decision-making processes will not be slowed down by size."
The push by the banking community to encourage business to use online services is driving e-business growth, Shaddick said.
Last year, 24% of UK businesses were carrying out some type of banking activity online and this has risen to 36% this year.