The short version
Rule 10b5-1 is a securities-law rule, not a tax rule. It gives company insiders an affirmative defense against insider-trading claims if they set up a qualifying written plan to buy or sell stock in advance, at a time when they do not have material nonpublic information, and then let it run on autopilot.
Because the plan dictates when your shares get sold, it also drives when you realize capital gains, which is the tax angle. This page explains the mechanism at a high level so you can have an informed conversation. Setting one up is genuinely a job for your securities counsel and your tax advisor together; the rules are technical and the stakes are legal, not just financial.
What the rule actually does
If you are an insider (an executive, director, or other employee with access to material nonpublic information), trading your company's stock is legally risky, because the moment you know something the public does not, a sale can look like insider trading. Rule 10b5-1 solves this by letting you commit to a trading plan in advance, while you are not aware of any inside information.
Once the plan is in place, trades happen automatically according to its terms (set amounts, prices, or dates), even if you later come into possession of material nonpublic information. Done correctly, the plan provides an affirmative defense: evidence that you scheduled the trades before you knew anything you should not trade on. It is widely used by founders and executives to sell concentrated stock in an orderly, defensible way.
The cooling-off period and other conditions
The SEC tightened these rules in amendments that took effect in early 2023, and the current conditions for the affirmative defense include a mandatory cooling-off period between adopting (or modifying) a plan and the first trade:
- For directors and Section 16 officers: the later of 90 days after adopting or modifying the plan, or two business days after the company discloses financial results for the quarter in which the plan was adopted, capped at 120 days.
- For other people: 30 days after adopting or modifying the plan.
The current rules also require a good-faith certification, generally limit you to one active plan at a time, restrict single-trade plans, and impose disclosure obligations on the company. These are the kinds of technical conditions where getting a detail wrong can cost you the legal protection, which is exactly why the plan itself should be drafted with counsel.
Where the tax planning comes in
The tax piece is a consequence of the timing the plan sets. Because the plan decides when shares are sold, it decides when you realize gains, whether a sale is long-term or short-term, and which tax year the income lands in. After an IPO, for example, a plan can stage your post-lockup selling rather than dumping everything at once, which can matter for both your tax bracket and your exposure to a single stock.
None of that changes how the shares are taxed; the rules from the relevant equity type still apply. What the plan changes is the schedule, and a schedule built with your tax situation in mind tends to beat selling on impulse. The right design depends on your holdings, your other income, and your goals, so this is a coordinate-with-your-advisors decision, not a template.
Where this trips people up
Treating it as a tax strategy first
A 10b5-1 plan is a securities-law tool first; the tax benefit is a byproduct of the timing. Design it for compliance and your sale goals, with counsel, and let the tax planning work within it, not the other way around.
Adopting it while holding inside information
The protection only works if you set up the plan when you are not aware of material nonpublic information, and in good faith. Trying to start one right before news breaks defeats the entire purpose and can invite scrutiny.
Forgetting the cooling-off period
You cannot adopt a plan today and sell tomorrow. Directors and officers face the later of 90 days or two business days after the next results disclosure (capped at 120); others wait 30 days. Build that lead time into any plan around a sale.
Tinkering with the plan
Modifying or canceling a plan can reset the cooling-off clock and undercut the good-faith story. Frequent changes can suggest you are timing trades on information, which is the opposite of what the plan is for.
Going it alone
This is one to do with your securities counsel and tax advisor, alongside your company's legal and insider-trading policies. The rules are technical and a misstep is a legal problem, not just a tax one. This page is background, not a substitute for that advice.
10b5-1 questions people ask
Who needs a 10b5-1 plan?
Mainly company insiders, executives, directors, and others with access to material nonpublic information, who want to sell company stock without the legal risk of appearing to trade on that information. If you are not an insider, you may not need one, which is a good question for your counsel.
Is a 10b5-1 plan a tax strategy?
Not exactly. It is a securities-law compliance tool. It affects your taxes only indirectly, by setting the timing of your sales, which determines when you realize gains and in which year. The tax planning happens within the plan's schedule.
How long before I can trade after setting one up?
There is a mandatory cooling-off period. For directors and officers it is the later of 90 days or two business days after the next quarterly results disclosure, capped at 120 days. For others it is 30 days. You cannot adopt a plan and sell immediately.
Can I change or cancel my plan?
You can, but modifications generally restart the cooling-off period and frequent changes can weaken the good-faith protection the plan is meant to provide. Changes should be made carefully and with your counsel, not casually.
Does a 10b5-1 plan change how my shares are taxed?
No. The tax treatment still depends on the equity type and your holding period. The plan only changes when sales happen, which affects the timing and character of the gains, not the underlying rules.
Can you set up my 10b5-1 plan?
Drafting the plan itself is securities-law work for your attorney, coordinated with your company's policies. What I can do is help with the tax-planning side, how the sale schedule interacts with your brackets, your other income, and your broader plan, so the two work together.
Keep reading
Equity at an IPO
A 10b5-1 plan often comes up around an IPO and lockup. Here is the full IPO equity picture. →
RSUs and how they are taxed
Most shares sold under a plan started as RSUs. Here is how they are taxed. →
QSBS
If your shares qualify, a large part of the gain may be excluded. Worth checking before you sell. →
All resources
Browse every equity-comp explainer in one place. →
Planning to sell company stock?
Your attorney handles the plan itself; I can help with the tax side, how the sale schedule fits your brackets, your other income, and your goals. If you are coordinating a 10b5-1 plan with your broader tax picture, I am happy to be part of that conversation. Here is how to start.
Become a ClientThis article is general information, not tax or legal advice for your specific situation. Tax outcomes depend on your individual facts, and the rules change over time. Talk to a qualified professional (I am happy to be that person) before acting on anything here. Reading this page does not create a client relationship.