There are many great articles explaining how Employee Stock Purchase Plans work. This one focuses on how to evaluate your ESPP and set a strategy, if the opportunity is right. We will break the process into five steps:
- Identify the key elements of your plan
- Calculate your estimated return
- Evaluate whether participating is worthwhile
- Decide how to pay for your ESPP
- Analyze when to sell or hold
1. Identify the key elements
All ESPPs are not created equal. Discount rates, favorable tax dates, offering periods, and other key figures vary by plan. To understand yours, find and document the following:
Allowed contribution percentage: The plan allows only a percentage of your annual pre-tax salary, and the IRS caps ESPP purchases at $25,000 per year. Use the smaller of the two.
Discount percentage: The guaranteed discount at which stock is purchased. Many plans include a “lookback” provision that uses the lower of the offering-date or purchase-date price before applying the discount. For a conservative calculation, use only the guaranteed discount.
Offering period: The duration from when money starts coming out of your payroll to the purchase date. This drives the annualized return calculation.
Holding period for favorable tax treatment: The plan documents state how long you must hold the stock from the offering date to receive capital-gains treatment. For most ESPPs it is two years, but it varies.
2. Calculate your estimated return
We recommend evaluating every investment opportunity through an annualized, tax-adjusted lens, and the ESPP is no different. Start with the “worst case” return you would receive by selling immediately on the purchase date — worst case because a lookback can only add appreciation on top of it:
- Discount rate ÷ (1 − discount rate) = pre-tax return
- Pre-tax return ÷ (offering period in months ÷ 12) = annualized pre-tax return
- Annualized pre-tax return × (1 − ordinary income tax rate) = annualized tax-adjusted return
An example: an employee in the 24% bracket, a 15% guaranteed discount, and a six-month offering period, selling on the purchase date. Step 1: 0.15 ÷ 0.85 = 17.6% pre-tax. Step 2: 17.6% ÷ 0.5 = 35.2% annualized pre-tax. Step 3: 35.2% × 0.76 = 26.7% annualized tax-adjusted return.
3. Evaluate whether participating is worthwhile
Based on the number you calculated: is the sell-on-purchase-date estimate attractive enough to participate? In the vast majority of cases it makes sense not only to participate but to contribute the maximum allowed. Even so, it is always worth comparing against the other opportunities available to you.
4. How to pay for your ESPP
Studies at the time this was written found that only about one in three eligible employees participates in their ESPP, and fewer still contribute the maximum. The most common reason is cash flow. If cash flow is the obstacle, financing options designed specifically for ESPPs exist — including programs some credit unions offer in partnership with employers — though any financing adds its own risk and cost.
5. Analyze when to sell or hold
Before the purchase date, decide whether to sell on the purchase date or hold for additional appreciation or favorable tax treatment. Considerations include:
- How volatile is my company stock?
- What is the growth trajectory of my company stock?
- Do I have other company stock vesting or already vested, and will the ESPP concentrate too much of my wealth in one company?
- Does my company’s health already influence other assets I own — starting with my paycheck?
If you are financing the purchase, holding past the purchase date adds risk that needs to be weighed. If you are holding for favorable tax treatment, weigh the volatility and uncertainty over the holding period against a more certain return at a less favorable tax rate. And if a large share of your assets is already tied to your employer, think hard about the pros and cons of holding still more company stock.
The bottom line
An ESPP can be a great way to capture additional value from your employer. There are several ways to participate, and the discount is real — but your risk increases the moment you choose not to sell on the purchase date. Know your plan’s terms, run the numbers, and make the sell-or-hold decision on purpose rather than by default.