RSUs and stock options both grant equity, but the mechanics, tax treatment, and best-fit stages differ. Here's when to use each.
Stock options dominate early-stage equity compensation. RSUs dominate late-stage and public company compensation. The crossover typically happens between Series C and IPO. Understanding when to switch and why matters — using the wrong instrument can cost employees millions in unnecessary taxes.
Employees receive the right to buy shares at a fixed strike price. Value comes from stock appreciation above strike. Tax deferred until exercise (ISOs) or exercise + sale (NSOs). Best when: 409A is low, company is early-stage, employees have cash to exercise. Works from incorporation through Series C.
Employees receive shares outright when they vest — no exercise price, no exercise decision. Full value taxed as ordinary income at vesting. Best when: 409A is high (options prohibitively expensive to exercise), company is near-IPO, employees can't or won't front cash for exercise. Standard at Series D+ and public companies.
Typically at Series C or D, when 409A crosses $5-10/share and option exercise costs become material for average employees. Also triggered by: IPO planning (RSUs simpler for public reporting), acquisition preparation, or when secondary market pricing makes options prohibitively expensive.
Switching from options to RSUs mid-stage is common but requires: board approval, employee communication (RSUs remove upside optionality but eliminate exercise burden), and updated equity plan. Some companies offer both (RSUs for cash-constrained employees, options for others).
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