When Your RSUs Vest, Your 10b5-1 Plan Decides the Tax Bill

You set up a 10b5-1 plan last year. Your company's legal team helped with the paperwork, you picked a sell schedule, and you stopped thinking about it. The plan handles the compliance, the blackout windows, the insider trading rules. It does what it's supposed to do. But here's the part most senior tech executives don't realize until April: your 10b5-1 schedules the trades, but it does not design the tax outcome. The two are different jobs, and confusing them is costing you.

The plan that schedules but doesn't plan

A 10b5-1 plan solves a specific problem. If you're a director or VP at a public company, you hold material nonpublic information during parts of every quarter, and you cannot trade your company's stock during those windows. A 10b5-1 lets you pre-schedule trades at a time when you know nothing the market doesn't know, and those trades execute even during a blackout period. It is a compliance tool.

What it is not is a tax strategy. The plan does not ask which lots to sell first. It does not check whether the sale triggers the alternative minimum tax. It does not flag a wash sale when your ESPP purchase overlaps with a scheduled 10b5-1 sale. It executes the trade, and the tax consequences land wherever they land. Most executives assume the plan handles the full picture. It handles about half.

Why the sale price isn't the whole story

Consider a senior director of engineering who has been with her company for seven years. She has 20,000 RSUs that have vested across four tranches at four different prices: $42, $68, $91, and $74. Her 10b5-1 plan is set to sell 500 shares per month.

Most brokers default to FIFO -- first in, first out. The shares that vested at $42 are sold first, producing the largest gain per share. That means more capital gains tax in the year of the sale, and at her income level, the 20% long-term capital gains rate plus the 3.8% net investment income tax.

But she could elect specific identification, choosing to sell the $74 or $91 lots first. On the same total proceeds, the gain is smaller, and so is the tax. The 10b5-1 plan did not ask which method she wanted. It used the default. The difference on 6,000 shares sold over a year can be a five-figure tax gap, and nothing in the plan's setup flagged it.

AMT and the 10b5-1 blind spot

If you hold incentive stock options alongside RSUs, the AMT calculus shifts with every sale. The bargain element on an ISO exercise counts as income for AMT purposes in the year of exercise, not the year of sale. A 10b5-1 that schedules ISO-related sales in January could trigger an AMT liability that would not exist if those sales happened in December.

The plan does not know your AMT situation. It does not model your projected alternative minimum taxable income. It executes on the date you gave it, and the tax form follows. For a tech executive with a seven-figure position and a large options overhang, the AMT surprise from a poorly timed 10b5-1 can run into six figures. The plan itself is not the problem. The problem is treating the plan as a complete solution rather than one piece of a larger design.

The wash sale rule nobody flags

A narrower problem, but a real one. If your 10b5-1 plan sells shares of your company stock and you also participate in an employee stock purchase plan that buys shares within 30 days before or after, the wash sale rule disallows the loss on the sale. The loss is deferred, and your cost basis adjusts instead.

Most 10b5-1 plans are set up by legal or compensation teams who do not look at your ESPP elections. The plan and the purchase operate on separate calendars, and the overlap is invisible until your tax preparer runs the calculation -- usually the following April. By then, the trades have settled, the cash has moved, and the only option is to report the disallowed loss and move on. A strategist catches this before the plan is written, not after the return is filed.

Building the plan around the outcome you want

This is where the sequence matters. A compliant 10b5-1 is table stakes. A strategic one starts with a target outcome and works backward.

What do you want the next three years to look like? Are you diversifying toward a target allocation, or planning an exit and a move out of California? Do you want to minimize gains in high-income years and shift them to a lower-tax year? Are you coordinating with a donor-advised fund or a charitable trust?

Once the outcome is clear, the 10b5-1 parameters -- start date, sell frequency, lot selection method, price limits -- are set to serve that plan, not the other way around. The compliance team drafts the plan. A tax strategist designs what goes inside it. Most firms provide the first. Roadmap Tax provides the second.

If you'd like to talk through how your 10b5-1 plan lines up with your actual tax picture, a free 15-minute discovery call is a good place to start. Call (619) 280-2700 or email info@RoadmapTax.com.

FAQ

What is a 10b5-1 plan?

A 10b5-1 plan is a pre-arranged trading plan that allows corporate insiders to buy or sell company stock at predetermined times, providing an affirmative defense against insider trading accusations. It is a compliance tool that enables executives to diversify their positions legally.

Does a 10b5-1 plan handle my taxes automatically?

No. A 10b5-1 plan schedules trades and provides legal protection for insider trading rules, but it does not account for capital gains tax, AMT, wash sale rules, or cost basis methods. These are separate tax strategy decisions that must be designed around the plan.

What is the best cost basis method for RSU sales under a 10b5-1?

It depends on your situation. Specific identification allows you to choose which tax lots to sell, which can minimize your capital gains in a given year. FIFO is the default for most brokers and may produce larger gains. A tax strategist can help you select the method that fits your overall plan.

How do RSUs affect the alternative minimum tax?

RSUs are taxed as ordinary income at vesting, which is also included in AMT income. If you also exercise incentive stock options, the bargain element can push you into AMT territory. A 10b5-1 plan that schedules sales in January versus December can shift your AMT liability significantly.

Can a 10b5-1 plan trigger a wash sale?

Yes, if your plan sells company stock and you also buy shares through an ESPP within 30 days before or after the sale, the wash sale rule disallows the loss. The plan operator typically does not check your ESPP elections, so this overlap often goes unnoticed until tax season.

Who should I work with to set up a strategic 10b5-1 plan?

A 10b5-1 plan should be drafted by legal counsel for compliance, but the tax strategy behind it should be designed by a tax strategist who understands RSUs, stock options, AMT modeling, and multi-year diversification planning. An enrolled agent firm like Roadmap Tax works alongside your legal team to build the full picture.