A new survey shows that the proportion of people categorised as self-employed increased from just under 13% to just under 15% between 1998 and 2018.
FSB research finds women are increasingly becoming the job creators and growth drivers within enterprise.
Representatives from the FSB met with Boris Johnson and his team a couple of weeks ago to discuss priorities for the new administration.
The research was commissioned to better understand modern SME working habits and revealed changing expectations about working cultures.
The government has published the draft finance bill, confirming plans to go ahead with extending IR35 rules to the private sector in April 2020.
Overall business confidence rose last month, with confidence in retail, construction and services up and the retail sector seeing the highest increase of 11 points to 22%.
The criticism comes after HMRC have recently lost a number of IR35 tribunal cases, and an acceptance by HMRC that the CEST tool only provides a determination in 85% of cases.
The APSCo consultation sought views on how the extension of IR35 changes into the private sector should be managed.