The study of more than 1,000 workers found 16% of workers looking to leave said they did not feel valued by their current organisation.
The majority (79%) of workers planning an exit would like to work at another company, while one in 10 would like to start their own business.
ILM chief executive Charles Elvin said the New Year is always a popular time for workers to think about their career.
"Our findings show that UK employees are beginning to reassess the job market and look into a range of new opportunities, from starting a new job to developing a new business," he said.
"As many workers like to make a change at this time of year, it is important that organisations adapt to this phase by offering the chance to learn new skills and opportunities to progress wherever possible."
The study also found a clear desire for workers to improve the standards of leadership in organisations. A fifth of the workers surveyed hope to improve their own leadership skills and 17% hope for more transparent leadership from their managers.
The most popular New Year's resolution for workers was to achieve a better work/life balance, with almost a third choosing this as their main priority for 2014.
