The Bonus That Pushes a Saver Over the Cliff
Priya, 44, earns $118,000 as a hospital operations manager and files single. She contributes 6% of salary to her employer's traditional 401(k) (employer matches 50% up to 6%). She has $9,200 in credit card debt at 24.9% APR, $3,100 in a savings account earning 0.4%, and no emergency fund beyond that savings. In December she learns she will receive a $40,000 performance bonus paid in the same calendar year, and her marginal federal rate is 24% (32% bracket begins at $191,950 of taxable income for single filers). Her employer's plan permits in-service distributions only after age 59½ and offers a Roth 401(k) option. She wants to retire at 62 and is worried about 'wasting' the bonus on taxes.
1. Should Priya direct the entire bonus into pre-tax 401(k) deferrals? Walk through the marginal-rate math and the competing uses of cash.
Read the worked answer
Pre-tax deferral reduces taxable income dollar-for-dollar, so $40,000 deferred saves roughly $9,600 at 24%. But the decision is not tax math alone - it is a comparison of after-tax returns and liquidity.
- Credit card debt: 24.9% guaranteed cost. Paying it off is a risk-free 24.9% return, far exceeding any expected 401(k) return. She should clear the $9,200 first.
- Emergency fund: 3–6 months of essential expenses; at ~$70,000 of essentials that is $17,500–$35,000. Her $3,100 is inadequate and the 401(k) is illiquid (no in-service distributions until 59½).
- Marginal bracket: Deferring $40,000 keeps her inside the 24% bracket rather than spilling into 32%, so the effective tax saving on the deferred slice is still 24%, not 32%. The 'bracket cliff' argument does not apply here.
- Roth option: At a 24% marginal rate now, pre-tax deferral is defensible if she expects a lower retirement rate; a split (e.g., partial Roth) hedges future tax risk.
Conclusion: Pay off the card, fund the emergency reserve to at least 3 months, then defer the remainder pre-tax (possibly splitting some to Roth). Deferring all $40,000 would leave her illiquid and carrying 24.9% debt - a negative arbitrage.
2. Priya says, 'The match is free money, so I should max the 401(k) before anything else.' Evaluate this reasoning.
Read the worked answer
The match is valuable but not unconditionally dominant. Her employer matches 50% up to 6%, so at a 6% contribution on $118,000 ($7,080) she receives $3,540 - an immediate 50% return on the matched dollars. That is compelling for the matched slice only.
The error is extending the logic to all contributions. Unmatched deferrals earn only market returns, while her credit card charges 24.9%. Ordering should be:
- Capture the full match (6%) - yes, keep this.
- Pay off the 24.9% card.
- Build the emergency fund.
- Increase unmatched deferrals.
So her instinct is right at the margin of the match but wrong as a blanket rule. Also note the match may be subject to a vesting schedule; if she might leave before vesting, the 'free money' is contingent.