Private companies sometimes partly use stock options (NQSOs, not ISOs) or stock grants, along with or instead of cash, to compensate consultants and independent contractors (separate from grants that public and private companies make to nonemployee directors). The size and terms of these grants can be different from those made to employees and should be considered in your negotiations (see a related FAQ). If the company goes public or is acquired, these options may become highly valuable. If the IPO or merger never happens, the options could be worthless.
Depending on the economy, local market conditions, and attitudes toward stock options, these grants are also made to lawyers, landlords, advertisers, recruiters, and other nonemployee service providers (as well as important customers). In its 2016 Domestic Stock Plan Design Survey, the NASPP found that 17% of the responding companies make employees of consulting or contracting firms eligible for stock option grants, and 11% make consulting firms themselves eligible. Roughly the same number of surveyed companies are willing to make restricted stock/RSU grants to individual consultants (14%) or to consulting firms (10%).
Grants of stock options are unlikely to be taxable to you until exercise (see related FAQs on the taxation and reporting for stock options and for restricted stock to consultants and contractors). However, an outright stock grant is compensation income that is taxable on its value at grant unless it first must vest (i.e. it is restricted stock). Restricted stock is taxed on the value at vesting unless you file a timely Section 83(b) election to be taxed on the value at grant.
Alert: When you receive an outright vested stock grant in exchange for your services (legal, marketing, etc.), this is income you must report on your tax return. Not receiving a 1099-MISC from the company does not mean you can avoid reporting income. Even though you cannot easily resell the shares because they are not registered with the SEC and your state, the stock is taxable income for an amount equal to its fair market value. You will need a reasonable valuation from an expert or the company.