The Roth IRA is funded and running. The employer match was captured back in Step 4. Now you close the gap to the employee max — the single largest tax deferral available to you. Same automation habit, much bigger bucket. Every pre-tax dollar you put in here reduces this year's federal tax bill and compounds undisturbed for decades.
The Roth IRA maxes at $7,000. Your 401(k) or 403(b) employee contribution limit is $23,500 — more than three times as much tax-advantaged space in a single account. After Step 10, the architecture is simple: point the same automation habit at a much larger target. The tax math is compelling at peak earning levels. At a 24% federal bracket, contributing the full $23,500 pre-tax saves you $5,640 in federal income taxes this year alone — the government effectively co-funds your retirement.
Annual federal tax savings from maxing a pre-tax 401(k) at a 24% bracket ($23,500 × 24%). The contribution doesn't cost what it looks like — a significant portion is tax you would have paid either way.
Step 4 captured the employer match — the free-money minimum, typically 3–6% of salary. That was the floor. Step 11 takes you to the ceiling: the full employee max at $23,500. The gap between those two numbers is entirely yours to fill, and every dollar of it gets the same tax deferral. Don't confuse "I captured the match" with "my 401(k) is handled."
Your employer plan almost certainly offers two modes: pre-tax (traditional) and Roth 401(k). The same contribution limit applies to both. The only difference is when you pay the tax — and the bracket rule makes the right call clear for most Freedom Builders.
Contributions come out of your paycheck before tax. Every $1,000 contributed at a 24% bracket only reduces your take-home by $760 — the other $240 is tax you're skipping right now. The money grows tax-deferred; you pay ordinary income tax on withdrawals in retirement. If your effective retirement rate is below your current bracket (very likely for most savers), you come out ahead.
✓ The right default for engineers in the 22–32% bracket
Contributions are after-tax — no upfront deduction. Growth and qualified withdrawals are completely tax-free. Unlike the Roth IRA, there are no income limits — anyone can contribute Roth 401(k) regardless of salary. SECURE 2.0 (effective 2024) also eliminated required minimum distributions from Roth 401(k)s during the owner's lifetime. Employer match still goes into a pre-tax account regardless of your choice.
Consider it if you're in a lower bracket, early career, or expect significantly higher taxes in retirement
Fund selection inside a 401(k) is often limited, but one number matters above all else: the expense ratio — the annual percentage fee the fund charges. A 1.00% expense ratio vs. a 0.05% index fund on $23,500/year contributions over 30 years at 7% gross return costs you roughly $200,000 in lost compounding. Every plan has a cheapest option — usually labeled "Index," "500," or "Total Market." Find it and use it. Target: under 0.20%; best-in-class index funds charge 0.01%–0.05%.
Phase 2 fills accounts in a deliberate order: HSA (triple tax advantage) → Roth IRA (flexibility, no RMDs) → 401(k) max (largest bucket). Each step re-points the same automation rails at the next destination. By the time you finish Step 11, every major tax-advantaged account is running on automatic. Step 12 handles whatever remains above those limits.
The IRS employee deferral limit — confirm the current-year figure at IRS.gov each January, as it adjusts periodically for inflation.
The annual max ÷ 12. Raise your contribution % in the benefits portal until your paycheck math lands here. Set it and let it run.
An extra $7,500 catch-up allowed starting at age 50, bringing the employee max to $31,000. Same account, same process — just a higher ceiling.
SECURE 2.0 (effective 2025) raised the catch-up for ages 60–63 to $11,250, for a total of $34,750. Reverts to standard $7,500 catch-up at age 64.
The maximum you should pay in annual fund fees. Best-in-class index funds (Fidelity Zero, Vanguard, Schwab) charge 0.01%–0.05%. Never pay more than 0.20% if an index alternative exists.
Federal income tax deferred by maxing the pre-tax employee contribution ($23,500 × 24%). State tax savings add to this figure depending on your state.
The mechanics are simple: log in, raise the %, pick the cheap fund. The challenge is behavioral — keeping the number moving each month instead of setting it once and forgetting. The lead measure is the monthly raise, not the final number. Pick your measure and go.
Log into your employer's benefits portal (Fidelity NetBenefits, Vanguard at Work, Empower, Principal, or similar) to adjust your contribution % and fund selection. To find expense ratios, look in the plan's fund fact sheet or compare at the fund company's website — search the ticker symbol and look for "Expense Ratio" or "Net Expense Ratio." The IRS publishes annual limit updates each October at irs.gov — verify the current-year employee max each January.
Here's exactly how to work each move from the lead measures above — skip to whichever one you're on.
For most Freedom Builders in the 22–32% bracket, pre-tax wins — and the margin is large. Here's the logic: you're deferring taxes at today's high rate, then paying them in retirement at a lower effective rate. A typical retiree with $1.5–2M in savings withdraws $60,000–$80,000/year, much of which fills the 10%–12% brackets first. You've deferred at 24% and will pay at 15–18% effective — that's a meaningful spread over 30+ years of compounding.
The Roth 401(k) wins when your bracket is unusually low: early career in the 12% bracket, a gap year, a career transition, or a year when income dips temporarily. It also makes sense if you're confident your retirement withdrawals will be taxed at a higher rate than today — which is mathematically possible but uncommon for most retirement scenarios.
One important distinction: unlike the Roth IRA, the Roth 401(k) has no income limits. A surgeon earning $600K can still use Roth 401(k) — the IRA phase-outs don't apply here.
Don't try to get there in one move. The strategy is gradual escalation plus raise banking — two different levers that get you there without feeling the impact.
Gradual escalation: raise your contribution % by 1–2% today. Set a calendar reminder for 30 days from now to raise it again. Repeat monthly. Each 1% increase on a $120K salary is ~$100/month before tax, which costs roughly $75/month in actual take-home at a 24% bracket. Most people don't notice $75.
Raise banking: every time your salary increases, log in and raise your contribution % by a matching amount before your spending pattern adjusts. A 5% salary raise on a $100K salary = $5,000/year — enough to cover most of the gap between your current % and the employee max. You never had the extra take-home, so you don't miss it. This is the fastest route for most people.
Almost certainly yes. The tax deferral benefit of a pre-tax 401(k) is substantial — typically large enough to outweigh even a 0.50–0.75% higher expense ratio compared to investing in a taxable account. The math: $23,500 deducted at 24% saves you $5,640 in taxes this year. Even at a 1% higher expense ratio on a $23,500 balance, the drag is ~$235/year — far less than the tax savings.
The better move: find the cheapest fund currently available (almost every plan has at least one low-cost option, even if the lineup is otherwise mediocre), contribute the max, and when you leave the employer, roll the balance into an IRA where you choose any fund from any brokerage. The 401(k) years are a short-term compromise for a long-term advantage.
Front-loading (contributing heavily in January–March to hit the IRS limit before year-end) is legal and mathematically sound — your money spends more months invested when markets tend to drift upward. The trap: if you hit the IRS limit in September, some employers stop matching contributions for the final three months of the year, costing you free money.
Check whether your plan has a true-up provision — a year-end calculation that ensures you receive your full employer match even if you front-loaded. Many large employers have this. If your plan does: front-load freely. If it doesn't: spread your contributions evenly across 26 pay periods to protect every dollar of the match. Call HR or check your Summary Plan Description to confirm.