New Executive Financial Planning: The First 90 Days

Joining a company as a C-suite executive or getting promoted to a named officer role creates a narrow window of time-sensitive financial decisions. Several of these deadlines are hard — miss the 30-day NQDC enrollment window and you've lost a year of deferral. Miss the 83(b) election deadline on restricted stock and the tax cost of the wrong outcome is permanent. Start trading company stock without a 10b5-1 plan in place and you're personally exposed.

Most executives know these rules in the abstract. Few have a clear action sequence for the first 90 days. This guide provides one.

1. Section 16 Form 3 — file within 10 days

If you're appointed as an executive officer or director of a public company, you become a Section 16 person immediately. The SEC requires you to file Form 3 — an initial statement of beneficial ownership — within 10 calendar days of your appointment date.¹

Form 3 reports all equity positions you hold in the company: RSUs (vested and unvested), stock options, shares, and any derivative securities. Your company's general counsel or stock plan administrator typically handles the mechanics, but the filing obligation is yours. Confirm that your employer has this covered and when the filing will be made.

Once you're a Section 16 filer, every subsequent acquisition or disposition of company securities requires a Form 4 within 2 business days. You also become subject to Section 16(b) short-swing profit liability — matching buy and sell transactions within any 6-month window requires disgorgement of profits to the company, regardless of intent.

2. 10b5-1 plan — adopt in your first open window

As a Section 16 officer with access to material non-public information (MNPI), you cannot freely sell company stock whenever you want. Selling outside a pre-approved 10b5-1 plan — or outside a formal open trading window during a period when you hold no MNPI — creates insider-trading exposure. Most executives at public companies need a 10b5-1 plan before they can meaningfully sell any equity.

Key timing facts under the 2022 SEC amendments:

• The plan must be adopted during an open trading window — not during a blackout period.
• Officers and directors face a mandatory cooling-off period: the later of (a) 90 days after adoption, or (b) 2 business days after the company files its Form 10-Q or 10-K covering the quarter in which the plan was adopted. Maximum 120 days.²
• You can generally maintain only one active plan at a time.
• Modifying an existing plan restarts the cooling-off clock.

Practical implication: if you join in January and the first open window opens in mid-February, you could adopt your plan then. Your first trade would be in late May at the earliest (90 days) or after the Q1 10-Q is filed and 2 business days pass — whichever is later, capped at 120 days from adoption.

See the 10b5-1 plan design guide and the sell-down calculator to model your target concentration trajectory and per-window volume.

3. Section 83(b) election — 30 days from grant date, no exceptions

If your new compensation package includes restricted stock (shares you receive outright but subject to vesting forfeiture), you have exactly 30 calendar days from the grant date to file a Section 83(b) election with the IRS.³ There is no extension, no cure, and no relief for missing it.

With the election: you recognize ordinary income on the grant-date value of the stock now (often near zero for startup restricted stock), and future appreciation from vesting onward is taxed at long-term capital gains rates (if held >1 year from grant). You also start the QSBS 5-year holding clock on the grant date — relevant if this is a startup with potential IRC §1202 qualified small business stock treatment.

Without the election: you recognize ordinary income at the fair market value at vesting for each tranche. If the stock appreciates from $5 to $40 per share before vesting, you'll owe ordinary income tax on $35/share at vesting — even if you can't sell the shares yet. At a 37% federal + state rate, this can create a tax bill with no cash to pay it.

Important: RSUs are not restricted stock and cannot use the 83(b) election. The election only applies to actual stock transferred subject to a substantial risk of forfeiture. RSU awards are promises to deliver stock in the future and are outside §83(b) by design. If your equity award says "RSU" at the top, the election doesn't apply. Read the award agreement carefully.

For ISOs, an early exercise (purchasing unvested shares at grant) can be paired with an 83(b) election — read the full 83(b) election guide for the ISO strategy.

4. NQDC plan enrollment — 30-day first-year eligibility window

If your new employer offers a non-qualified deferred compensation (NQDC) plan, your first chance to enroll comes with a narrow window. Under Treasury Regulation §1.409A-2(a)(3), an executive who is newly eligible for a NQDC plan can make an initial deferral election within 30 days of the date they first become eligible for the plan.⁴ That election covers only compensation earned after the election date — not retroactively.

After this window closes, you can only make elections during the regular annual enrollment period (typically October–December, for the following year's compensation). So if you join in March and don't enroll in April, your first chance to defer any compensation into NQDC is the following year's enrollment window — meaning you've missed 9+ months of potential tax deferral.

Whether you should defer depends on:

• Your current marginal tax rate vs. expected retirement-year rate
• Company solvency confidence (NQDC balances are unsecured creditor claims)
• Your need for current cash flow
• The plan's reference investment options and credited rate

Use the NQDC deferral calculator to model the tax savings, then read the NQDC strategy guide for the distribution trigger decision (which you elect at the same time).

5. Read your equity award agreement

Your equity award agreement governs what you actually have — and most executives don't read it closely until something goes wrong. Items to verify within your first week:

6. Adjust your tax withholding immediately

At your new compensation level — base salary, bonus, equity vesting — supplemental wages will be withheld at the IRS flat 22% rate, but your actual marginal federal bracket is likely 32–37%. The gap compounds all year. A CFO earning $500K base + $400K RSU vesting will generate roughly $60,000–$75,000 of federal withholding underpayment per year if nothing is done.

Two options:

• Increase W-4 withholding. On Form W-4 (2020+), use Part 4(c) "Extra withholding" to specify an additional dollar amount per paycheck. If you estimate a $72,000 annual gap, adding $2,769/pay period (biweekly) zeros it out. No quarterly payments needed.
• Pay quarterly estimates. Use EFTPS or IRS Direct Pay by each due date. The estimated quarterly taxes guide covers 2026 safe harbor rules and due dates.

Social Security: the 2026 SS wage base is $184,500. If your base salary alone exceeds this (as it will for many C-suite roles), all supplemental compensation (bonuses, RSU vesting, option exercises) incurs Medicare tax (1.45% + 0.9% additional Medicare tax above $200K single) but not Social Security — so the 22% supplemental withholding rate is only federal income tax.

7. Address departing employer equity

If you're leaving a previous company to take this role, the departure triggers its own set of time-sensitive decisions:

• ISO post-termination exercise window. Your ISOs convert to NSOs 90 days after separation. If the stock has appreciated and AMT isn't prohibitive, exercise before the window closes. After 90 days, you lose the qualifying disposition advantage entirely. See the departure planning guide.
• NQDC separation trigger. Leaving is typically a "separation from service" — one of the six 409A distribution triggers. Know when distributions will begin (6-month delay if you're a specified employee of a public company). You cannot receive the balance early or roll it to an IRA.
• Golden handcuffs cost. Unvested equity forfeited at departure has a real after-tax cost. Use the golden handcuffs calculator to quantify what you're leaving on the table — and verify your new employer's sign-on covers the gap.
• 10b5-1 plan closure. A pre-existing 10b5-1 plan typically terminates at separation. Any trades executed after you're an insider — even under the plan — may not have the affirmative defense if the plan is terminated.

60–90 day actions

After the hard deadlines pass, turn to longer-horizon planning:

• First open window: adopt your 10b5-1 plan if you haven't already.
• Build your 5-year equity income model. RSU tranches vest annually — overlapping grants from year 1, 2, and 3 can stack. Use the RSU multi-year vesting projection to identify your peak income years and plan NQDC deferrals accordingly.
• Evaluate your concentrated stock trajectory. At what equity value does a sell-down strategy make sense? The concentrated stock guide maps your options across five strategies.
• Review estate plan. Executive compensation changes your net worth trajectory significantly. Update beneficiary designations, review life insurance needs against new NQDC balances (which pass to heirs as IRD), and verify your estate plan reflects new equity holdings.
• Benchmark your total comp. Use the 2026 executive compensation benchmarks and SEC proxy data (DEF 14A filings from peers) to assess whether your package is competitive — which matters when your employment agreement comes up for renewal.

New executive planning checklist

Sources

1. SEC Rule 16a-3(a) — Form 3 initial statement of beneficial ownership; 17 CFR §240.16a-3
2. SEC Release No. 33-11138 (December 2022) — 10b5-1 plan cooling-off periods and amendment rules; Final Rule
3. IRC §83(b) — election to include property in gross income in year of transfer; 26 U.S.C. §83; IRS Form 15620 (dedicated 83(b) form as of 2024)
4. Treas. Reg. §1.409A-2(a)(3) — initial deferral election for first year of eligibility; 26 CFR §1.409A-2

Values verified as of June 2026. IRC §422(a)(2) ISO 90-day post-termination window is statutory and unchanged by recent legislation. SS wage base $184,500 and 22% supplemental withholding rate per IRS Rev. Proc. 2025-32.