Deferred Comp vs Brokerage Account: The Break-Even Math Behind Deferring

Deferring pay into an NQDC plan tends to beat taking the cash and investing it in a taxable brokerage account when your tax rate at payout will be lower than it is today, and when the taxable account would lose a meaningful amount to yearly taxes on dividends and gains. If your rates now and later are about the same, the edge shrinks to that avoided tax drag, and employer credit risk can erase it.

That's the real decision behind "should I defer?" Once you've maxed out your 401(k), the alternative to deferring isn't doing nothing. It's taking the money as pay, paying tax on it now, and investing what's left.

This guide breaks down the math the NQDC calculator runs: the rate difference, tax drag, capital gains rates, the step-up in basis, and the risks and costs that don't show up in a simple compounding chart.

The two paths, side by side

Picture $10,000 of salary you could defer.

• Defer: the full $10,000 goes into the plan pre-tax. It grows, and every dollar is taxed as ordinary income when it's paid out. See how deferred compensation is taxed.
• Take the cash: you pay income tax on the $10,000 now and invest the rest in a brokerage account. Dividends are taxed each year, and gains are taxed when you sell.

Social Security and Medicare taxes are generally the same on both paths, because NQDC deferrals are subject to FICA in the year you defer under the special timing rule. So FICA doesn't tip the decision either way.

The core break-even: tax rate now vs later

Strip away every complication and assume the brokerage account owed no tax until the end. Then:

• Defer: $10,000 × growth × (1 − tax rate at payout)
• Take cash: $10,000 × (1 − tax rate now) × growth

The growth is the same, so the two paths are exactly equal when your rate at payout equals your rate today. Pre-tax compounding alone doesn't create an advantage; it's a common misconception.

That gives the first rule of thumb:

• Lower rate at payout (you retire on less income, or move to a lower-tax state): deferring gains.
• Same rate: a tie before tax drag and risk.
• Higher rate at payout (big pension, large IRA withdrawals, a lump sum stacked onto other income, or higher future tax rates): deferring loses ground.

Your state matters as much as your federal bracket. Moving from a high-tax state to a no-tax state can turn a tie into a clear win, but only if the payout schedule protects you from your former state's tax. See deferred compensation and state taxes when you move.

Tax drag: where the brokerage account leaks

In real life the brokerage account does pay tax along the way. That's tax drag, and it is the structural advantage NQDC has even at equal rates.

• Dividends: qualified dividends are taxed each year at 0%, 15% or 20% depending on your income (IRS Topic 409). Nonqualified dividends and interest are taxed at ordinary rates.
• Capital gains distributions: some funds distribute gains every year, even if you never sell.
• Net investment income tax: investment income in a taxable account can add 3.8% above $200,000 of modified AGI for single filers or $250,000 for joint filers. NQDC payouts are wages, so they aren't subject to NIIT (IRS NIIT Q&A).

Broad index funds and ETFs usually keep drag low. High-yield or actively managed funds raise it.

Where the brokerage account fights back

The taxable path has real advantages that simple comparisons often leave out.

Long-term capital gains rates

Growth in a brokerage account is eventually taxed at long-term capital gains rates of 0%, 15% or 20% (plus NIIT if it applies), and you choose when to sell. Every dollar of NQDC growth is taxed as ordinary income, which can be far higher.

Step-up in basis at death

If you hold investments until death, your heirs generally receive a basis equal to fair market value at death under IRC section 1014. The unrealized gain is never taxed. An NQDC balance paid to heirs is income in respect of a decedent: it's ordinary income to them, with no step-up.

Liquidity and control

A brokerage account is yours to sell any time. NQDC pays out only on events set in advance under section 409A, and changing the timing generally means delaying payment by at least 5 years. You can't roll it to an IRA, borrow against it or tap it for a down payment. See 409A deferral election rules.

The risks and costs on the NQDC side

Employer credit risk

An NQDC balance isn't a separate account in your name. You're an unsecured general creditor of your employer (IRS Publication 5528), and in bankruptcy you'd rank behind secured creditors. A rabbi trust doesn't change that. Even a small annual chance of default, compounded over a long deferral and payout period, can cancel a modest tax advantage. Read NQDC risks and rabbi trusts.

Fund menu and fees

NQDC investment options are usually notional: your balance tracks funds chosen from the plan's menu. If those options cost more than low-cost index funds, the fee gap works like extra drag on the NQDC side. Check your plan's fund list and expense ratios.

Employer money

Some plans add employer credits on deferrals. Others reduce your 401(k) match if deferring lowers the pay it's based on. Both shift the math, and the calculator models each.

A worked example (illustrative and simplified)

Assume $10,000 of pre-tax salary, a 37% tax rate today, 20 years until payout, and a 6% annual return made up of a 1.5% qualified dividend yield and 4.5% price growth. Dividends and gains in the brokerage account are taxed at 23.8% (20% plus 3.8% NIIT), and dividends are reinvested after tax. State tax, FICA (equal on both paths), fees and credit risk are ignored.

How the numbers work: the deferred $10,000 grows to about $32,071 before payout tax. Taking the cash leaves $6,300 to invest. After paying tax on dividends each year, that grows to about $18,887, with a cost basis of about $8,849 (the original $6,300 plus reinvested after-tax dividends). Selling triggers about $2,389 of tax on the roughly $10,038 gain.

In this simplified setup, deferring comes out ahead even at equal rates, purely from avoided tax drag. Note the last row is money your heirs receive; an inherited NQDC balance would still owe ordinary income tax, so it isn't directly comparable to the defer rows. Add a few percent of employer default risk, higher plan fees, or a higher tax rate at payout, and the result can flip.

When each path tends to win

These are tendencies, not rules. The answer depends on how the factors combine for you, which is why the free NQDC calculator runs both paths year by year with your federal and state tax, payout schedule, a state move and default risk. A free account shows the headline verdict; Pro adds the full breakdown, including the break-even annual default risk. For the bigger picture, see is deferred compensation worth it.

Your plan document governs what your plan allows, and a qualified tax or financial professional can help you weigh these trade-offs for your situation.

Frequently asked questions

Is it better to defer compensation or invest in a brokerage account?

It depends mainly on whether your tax rate at payout will be lower than today, how much tax drag the brokerage account would have, and your employer's credit risk. At equal tax rates, deferring wins only by the avoided drag, which credit risk or high fees can wipe out.

What tax rate at payout makes deferring break even?

Ignoring tax drag, fees and credit risk, the break-even is simple: your payout rate equals today's rate. Tax drag in the brokerage account raises the break-even payout rate a bit above today's rate, while credit risk and higher plan fees lower it.

Does deferring save Social Security and Medicare tax?

No. NQDC deferrals are generally subject to FICA in the year you defer, just like cash pay. The payout is then generally free of FICA, so payroll tax is about the same on both paths.

Do NQDC payouts get capital gains treatment?

No. Every dollar paid from an NQDC plan, including growth, is ordinary income. In a brokerage account, long-term gains and qualified dividends are taxed at 0%, 15% or 20%, and gains held until death can escape tax through the step-up in basis.

How much employer default risk wipes out the NQDC advantage?

There's no single number; it depends on the size of your tax advantage, how long the money stays deferred, and how much you might recover in a bankruptcy. The calculator estimates the break-even annual default risk for your own inputs.