The survey of 300 IT and business project managers from UK companies found that 15% of projects were scrapped before completion - but managers thought that 19% should be canned.
That gap of 4% is costing the average large company (with 159 concurrent projects) £13.4m every year, according to the research, which was presented to the IT Directors' Forum on board the cruiseship Aurora last week.
Despite this waste, 84% of projects were completed within budget, according to the research, although the longer the project ran the more likely it was to go over budget.
The most common causes of budget overruns cited by managers were a change in plan (27%), a lack of resources (15%) and an inadequate brief (15%).
The survey found that only 26% of projects were not completed on schedule, but Ivan Lloyd, technology director, corporate project solutions, Microsoft Project Advisory Council, believed the research presented an overly optimistic view of project management in the UK.
"My experience suggests the number is the mirror opposite - probably 75% of projects are behind schedule and barely 25% get finished on time. Most of the projects I have seen do not incorporate strong, fully enforced and timely cost reporting."
Managing time was the biggest headache in running an IT/business project, according to the survey's respondents, followed by managing costs and a lack of human resources.
The survey also raised concerns that projects were being managed on outdated information. Although project managers spent an average of 13 hours a month producing management reports, more than 60% of business decision makers said the information they received on projects was out of date.
Half of the companies surveyed employed more than 1,000 staff, and none employed fewer than 500.