Stock Options vs RSUs: Which to Take in a Job Offer

Priya, 32, is weighing two senior-engineer offers in California (single filer, ~$210,000 base each). Offer A is a Series A startup granting 16,000 stock options at a $0.60 strike. Offer B is a newly public company granting 4,000 RSUs at a $45 share price — an immediate $180,000 of grant value. Using the 1-RSU-≈-3.5-options rule of thumb, the startup’s 16,000 options normalize to roughly 4,570 “RSU-equivalents,” so on paper the grants are close. But they are not the same bet. The RSUs are worth $180,000 the day they fully vest no matter what the market does (short of the stock collapsing). The options are worth $0 unless the startup’s share price clears $0.60 — and worth a fortune if it reaches $20. The right answer depends on her cash, her risk tolerance, and above all the stage of the company.

The one-sentence decision rule

Early-stage private startup → ask for options. Public or late-stage company → take RSUs. Everything else in this article is the reasoning, the tax mechanics, and the edge cases — but that rule covers most readers. The pivot is the strike price relative to the current share value: at an early startup the strike is cheap and the upside is leveraged; at a mature company the strike (or the RSU’s full-value structure) removes the leverage and RSUs become the lower-risk way to hold the same equity.

Why options win at an early-stage startup

A stock option is the right to buy shares at a fixed strike price (set to the 409A fair market value on your grant date). At a seed or Series A company, that strike is often under $1.00. If the company exits at $20/share, a $0.50-strike option captures $19.50 of gain per share — a roughly 40× return on the strike you paid. An RSU at the same company would capture the full $20, but you would receive far fewer RSUs (the 3–4× ratio), and pre-liquidity RSUs at a private company create a tax problem: ordinary income at vest with no shares you can sell to pay the tax. That is why early startups grant options, not RSUs.

The asymmetry cuts both ways. The downside of an option is total: if the share price never clears your strike, the option is underwater and expires worth $0. You can also be forced to spend real cash to exercise — 16,000 options at a $0.60 strike costs $9,600 out of pocket — plus a potential AMT bill on the ISO spread under IRC §56(b)(3) the year you exercise. Options are the right instrument when you can fund the exercise, can stomach a $0 outcome, and want the leveraged upside.

Why RSUs win at a public or late-stage company

A restricted stock unit has no strike price. When it vests, you receive a share — full stop. If the share is worth $45 at vest, your RSU is worth $45. It cannot go underwater, it costs you $0 to acquire, and at a public company there is an instant, liquid market to sell into. That removes three of the option’s biggest risks at once: the worthless-below-strike risk, the exercise-cash risk, and the illiquidity risk. The price you pay for that safety is the lost leverage — an RSU never multiplies the way a cheap-strike option can.

At a late-stage private company approaching IPO, RSUs are usually structured as “double-trigger” units that vest only after both a time condition and a liquidity event (the IPO), so you are not taxed on illiquid paper. By the time you can sell, the shares are real and tradeable. For most employees joining a company that is public or clearly headed there, the guaranteed-value, zero-cash, no-AMT profile of RSUs beats the option lottery ticket.

The 1-RSU-≈-3-4-options rule of thumb

Recruiters quote share counts, not dollar values, and an option share is not worth an RSU share. The widely used heuristic: 1 RSU is worth roughly 3–4 options. The logic is that an option only captures appreciation above the strike while an RSU captures the entire share price. Use it to normalize competing offers:

• Offer of 12,000 options → divide by 3.5 → ≈ 3,430 RSU-equivalents.
• Offer of 4,000 RSUs → multiply by 3.5 → ≈ 14,000 option-equivalents.

The ratio is rough — the true value depends on volatility, time to liquidity, and the strike-to-FMV gap — but it stops you from being dazzled by a big option share count that is actually worth less than a smaller RSU grant.

Tax contrast: the part that surprises people

The two instruments are taxed on completely different schedules. RSUs give you no timing control; options give you several decision points. Here is the side-by-side:

The headline: RSUs are taxed as ordinary income on the full FMV at vest — you have no choice and no cash outlay because the employer typically sells ~22% of vested shares to cover federal withholding (the supplemental-wage rate under IRS Pub. 15; California adds 10.23% on equity withholding per FTB DE 44). Options defer all tax to exercise. NSOs tax the spread as ordinary income plus FICA the moment you exercise. ISOs create no regular tax at exercise — only an AMT preference item — and, if you hold one year past exercise and two years past grant (a qualifying disposition under IRC §422), the entire gain is long-term capital gains at 0/15/20% plus the 3.8% NIIT (IRC §1411) above $200,000 MAGI single / $250,000 MFJ. That ISO path is the lowest-tax outcome available — one reason a risk-tolerant employee may prefer options beyond the upside alone.

Worked numbers: Priya’s two offers

Take both offers to a hypothetical $20/share exit or trading price four years out, after a standard 4-year vest with a 1-year cliff (25% vests at month 12, then monthly).

If Priya believes the Series A startup will reach a $20 share price, the options are the bigger bet by far and can be taxed almost entirely as long-term capital gains. If she is not confident in the exit, or cannot risk the $9,600 exercise cash and AMT, the RSUs hand her $180,000 of value at vest with no downside scenario short of the public stock cratering. Same employee, opposite answer — driven by stage and risk tolerance.

What most people miss

• RSUs create a forced tax bill with no cash from the company. The ordinary income at vest is real even if you never sell a share. If you hold the shares and the price then drops, you can owe tax on a value you no longer have — the classic post-IPO RSU trap. Always let sell-to-cover run, and consider selling the rest at vest since RSUs are economically identical to a cash bonus you immediately reinvested in one stock.
• The AMT on an ISO exercise can dwarf the exercise cost. Exercising 16,000 ISOs at a $0.60 strike when the 409A FMV has risen to $8 creates a $118,400 AMT preference item — potentially a five-figure AMT bill in a year you received no cash. Model the AMT before exercising, not after.
• You can negotiate the instrument, not just the amount. Many late-stage companies will offer RSUs or options — ask. If you have high risk tolerance and cash, request options for the leveraged, LTCG-friendly upside; if you want certainty, request RSUs.
• The vest schedule is the real lock-in. A 4-year vest with a 1-year cliff means leaving at month 11 forfeits everything. Both instruments share this; weigh it against your expected tenure.
• Options expire — usually 90 days after you leave. Vested options you can’t afford to exercise within the post-termination window vanish. RSUs, once vested into shares, are simply yours.

Decision lever: stage first, then cash, then risk tolerance

Run the decision in this order. (1) What stage is the company? Early-stage private with a sub-$1 strike → options are the structurally correct instrument. Public or pre-IPO with a high valuation → RSUs. (2) Can you fund exercise + AMT and survive a $0 outcome? If no, take RSUs even at a startup — an option you can’t afford to exercise is worthless to you. (3) How leveraged do you want to be? If you want a guaranteed payout, RSUs; if you want the 40× lottery ticket and can stomach the loss, options. The instrument follows the stage, and the stage tells you whether you are buying upside or buying certainty.