Retirement Math When 60% of Your Net Worth Is Your Employer

The 4% rule assumes a balanced portfolio with roughly 60% stocks and 40% bonds, rebalanced annually, withdrawn from in dollars adjusted each year for inflation. That portfolio has a 95%+ probability of sustaining a 30-year retirement based on historical US data. The rule does not apply to a portfolio where 60% of the equity allocation is a single stock. Single-stock risk compounds with sequence-of-returns risk, and the failure rate rises sharply.

For a tech employee or executive entering retirement with most of their net worth in employer stock, the first question is not “what is my safe withdrawal rate” but “how much of this concentrated position can I diversify before retirement begins, and how do I fund living expenses during the transition.” The tax cost of diversifying at 23.8% federal plus state is painful. The risk cost of a 50% single-stock drawdown in year two of retirement is worse, often irrecoverable.

This guide walks through the retirement math for concentrated-stock households: the sequence-of-returns problem specifically, the withdrawal rate implications, the Roth conversion opportunity, net unrealized appreciation on employer stock inside a 401(k), and the planning sequence for the 10 years before and the 5 years after retirement.

The sequence-of-returns problem

Two retirees with identical 30-year average returns can end up with dramatically different outcomes depending on when the bad years hit. If the worst years come first, the retiree is drawing down a shrinking portfolio at the worst possible time, and the math often does not recover. If the worst years come last, the retiree has already banked the early good years and the losses hit a portfolio that has already supported years of withdrawals.

For a diversified portfolio, sequence risk is mitigated by bonds and by the diversification itself (not all equity losses happen simultaneously). For a concentrated single-stock portfolio, sequence risk is amplified. One bad earnings cycle can halve the principal in a quarter. If that quarter happens in year two of retirement, the compounded damage of withdrawing from a halved portfolio during recovery is severe.

Historical example. A retiree entering retirement January 1, 2000 with 100% of their portfolio in a large-cap tech stock (pick your example) experienced a 70-80% drawdown over the next two years. Drawing 4% annually from a portfolio that lost 70% in two years means the nominal dollar draw in year three is the same, but as a percentage of remaining assets it is 13%. Recovery required the stock to triple from the low just to get back even while withdrawals continued.

For a diversified retiree in the same period, the S&P 500 drawdown was 49%, and a 60/40 portfolio drawdown was 22%. Recovery was faster and the withdrawal-as-percentage hazard was manageable.

The deconcentration glide path

A decade before expected retirement, most concentrated-stock holders benefit from a staged reduction in their single-stock exposure. The tax cost of selling gradually over 5-10 years is lower than selling all at once (bracket management) and much lower than the risk of entering retirement concentrated.

A reasonable glide path:

These targets are not prescriptive. An executive in the middle of a multi-year vesting schedule may reasonably stay higher in the early glide years and aggressively reduce at the end. A founder whose QSBS matures at year five post-exit may time the sales to preserve QSBS eligibility.

The operational tools are staged sales, 10b5-1 plans for insiders, direct indexing to harvest offsetting losses, and exchange funds for very large positions. Each has tradeoffs; what matters is committing to the glide path in writing before retirement, because once retirement begins the emotional pull to hold “just one more quarter” gets stronger as the stock moves.

Sustainable withdrawal rates

For a diversified 60/40 portfolio, the 4% rule is a reasonable starting point. For a concentrated portfolio, the sustainable withdrawal rate is meaningfully lower, often 2.5-3%, because the effective equity volatility is higher and the failure-mode tail is fatter.

A simple framework: calculate your withdrawal rate against the diversified portion of the portfolio only. A $5M net worth with $2M in diversified assets and $3M in single-stock employer stock might sustain $80k per year of withdrawals from the diversified $2M (4%), plus any dividend or controlled sell-down from the concentrated position. This avoids the single stock being forced to fund retirement during a drawdown.

A more structured approach uses a “bucket” strategy. Bucket 1 (cash and short-term bonds): two years of living expenses, immune from market moves. Bucket 2 (diversified intermediate-term bonds and bond funds): five years of living expenses. Bucket 3 (equities, including the concentrated stock position): everything else. Withdrawals come from Bucket 1, which is refilled from Bucket 2 annually, which is refilled from Bucket 3 during up markets. During drawdowns, the concentrated position is not liquidated into weakness.

Roth conversion ladders during low-income years

The years between retirement and the start of Required Minimum Distributions (age 73 under current law) are typically the lowest-income years of the taxpayer’s life. This is the window for Roth conversions, which convert traditional IRA or 401(k) dollars to Roth, pay tax at current (low) rates, and escape future RMDs and their associated brackets.

Example. A 62-year-old retiree with $3M in traditional 401(k) assets, currently living on taxable-account savings and a small Social Security draw, has $40k of ordinary income. Converting $150k from traditional to Roth each year fills up the 22% bracket (top of 22% is $103,350 single in 2025, $206,700 joint). Over 10 pre-RMD years, that is $1.5M of conversions at an average rate of perhaps 17% blended, saving roughly $200-300k compared to RMDs at the 24-32% brackets later.

Concentrated-stock retirees face a complication. The stock itself is outside the 401(k) (usually). But if they sell a chunk of the concentrated position in a given year, that year’s capital gains push them into higher brackets and make Roth conversions that year more expensive. Coordinate the sale years and the conversion years to avoid stacking.

Net unrealized appreciation on employer stock in a 401(k)

Some tech employees hold employer stock inside their 401(k), often because the company matched in stock or because the employee actively purchased it. The NUA rule (Net Unrealized Appreciation) provides a specific tax benefit at distribution.

Mechanics. At retirement, the employee takes a lump-sum distribution of the entire 401(k) and rolls everything except the employer stock into an IRA. The employer stock is distributed in-kind into a taxable account. The employee pays ordinary income tax only on the cost basis of the stock (what was paid in, typically low). The appreciation (NUA) is not taxed until sale, and when sold is treated as long-term capital gain regardless of the holding period in the taxable account.

Example. $500k of employer stock in 401(k), with $100k cost basis and $400k of appreciation. Taking NUA means $100k of ordinary income at distribution, $400k held at LTCG-eligible status in taxable. Alternative: roll everything to IRA and pay ordinary rates on all $500k when withdrawn, which at 32% is $160k vs. NUA of $32k ordinary plus $80k LTCG = $112k. Savings: $48k.

NUA requires a lump-sum distribution in one tax year and a triggering event (separation from service, age 59.5, disability, or death). The stock must be distributed in-kind. Partial rollover of the stock defeats NUA on the rolled portion.

This is underused. Employees who have employer stock in their 401(k) and are retiring should always analyze NUA before a straight rollover.

Social Security timing

Social Security benefits are reduced if claimed before full retirement age and increased if delayed past FRA (up to age 70, at which point there is no further benefit to waiting). For high-income retirees with longevity on one or both sides of the family, delaying to 70 generates an effective 8% annual increase in the benefit.

For concentrated-stock retirees, delaying Social Security while drawing from the concentrated position to fund early retirement has two benefits. First, it increases the eventual annuitized lifetime income from Social Security, which partially offsets sequence risk. Second, it lowers current-year income during the Roth conversion window, making conversions cheaper.

Frequently asked

Can I still use the 4% rule if I am concentrated? Not safely. For concentrated portfolios, withdrawal rates of 2.5-3% applied against the total portfolio, or 4% applied only against the diversified portion, are more defensible. The exact rate depends on the concentration percentage and the volatility of the specific stock.

Should I annuitize part of my portfolio? An immediate fixed annuity converts a lump sum into guaranteed lifetime income and is effective insurance against longevity and sequence risk. For concentrated-stock retirees, buying a single-premium immediate annuity (SPIA) with a portion of diversified assets can lock in baseline income that is independent of the concentrated position’s performance.

What about long-term care insurance? For households with $5M+ of assets, self-insurance (paying for LTC out of assets) often makes more sense than buying LTC insurance. For middle-net-worth retirees ($2-5M), LTC insurance or a hybrid LTC-life product can hedge the tail risk of a multi-year care episode.

Do I need to keep tax-loss-harvesting in retirement? Yes, if you have realized gains from concentrated-stock sales. The $3,000 annual deduction against ordinary income plus the unlimited offset against capital gains makes harvesting valuable as long as you have a concentrated position to manage down.

When should I start Social Security? Delay past full retirement age if your projected longevity is average or above and you have other sources of income. For households where one spouse is significantly higher-earning, delay the higher earner’s benefit to age 70 and the lower earner’s at FRA or earlier.

Next step

Map your concentration percentage against your retirement timeline before setting the withdrawal strategy. The retirement readiness calculator models the failure rate under different single-stock percentages and withdrawal rates. For households within 10 years of retirement with >30% single-stock concentration, engaging a fiduciary advisor specifically on the deconcentration glide path is usually worth the fee; the cost of entering retirement too concentrated is much larger than the cost of professional planning.