In my country there is a problem with employers forcing their employees to fictionally incorporate, so employer can save on social security (in case of 1 person companies social security is not associated with actual income, but can be paid in low minimal monthly amount, of course lower monthly social security payments means lower retirement benefits which is not good for fictionally incorporated employees).

Our IRS equivalent decides that incorporation was fictional if former employee has 1 person company, has only one client and this client is his former employer. If you have multiple clients and none of them hired you before you started your own company then you are safe.