Today, more than 70 million Americans participate in 401(k) plans, and have almost $9.3 trillion invested through them—making 401(k)s one of the most widely used retirement savings vehicles in the country. For many employees, a 401(k) serves as the foundation of their retirement strategy.
Whether you’re just getting started or reviewing your current retirement plan, understanding how a 401(k) works can help you make more informed financial decisions.
What Is a 401(k)?
A 401(k) is an employer-sponsored retirement savings plan that allows employees to contribute money directly from their paycheck into a retirement account.
A 401(k) is considered a defined contribution plan, meaning your future retirement balance depends on:
- How much you contribute
- Whether your employer contributes
- How your investments perform over time
Many employers also offer matching contributions, which can help employees grow their retirement savings faster.
Traditional (Pretax) 401(k) Contributions
Traditional 401(k) contributions are generally made using pretax dollars.
This means:
- Your contributions may reduce your taxable income for the year
- Investments grow tax deferred
- Withdrawals in retirement are generally taxed as ordinary income
Example
If you earn $130,000 annually and contribute 10% ($13,000) pretax into your 401(k), your taxable income may be reduced to $117,000 for federal income tax purposes for that year.
You generally do not pay income taxes on those contributions or investment earnings until you withdraw the funds in retirement.
Roth 401(k) Contributions
Roth 401(k) contributions are made using after-tax dollars.
With a Roth 401(k):
- Contributions do not reduce your taxable income today
- Investments grow tax free
- Qualified withdrawals in retirement are tax free
A distribution is generally considered qualified if:
- At least five years have passed since your first Roth contribution, and
- You are age 59½, disabled, or deceased
Many employer plans allow participants to split contributions between traditional pretax and Roth contributions.
How To Decide Between Pretax and Roth Contributions
One common question investors ask is whether pretax or Roth contributions make more sense for their situation.
The answer often depends on factors such as:
- Your current income and tax bracket
- Your expected tax rate in retirement
- How long you have until retirement
- Your overall financial goals and cash flow needs
Some investors prefer the immediate tax benefit of pretax contributions, while others value the potential for tax-free income later in retirement. In many cases, a combination of both may help create future tax diversification.
Investment Choices Within a 401(k)
Most 401(k) plans allow employees to choose investments from a menu of options, which may include:
- Target-date funds
- Mutual funds
- Index funds
- Bond funds
- Stable value funds
Choosing investments that align with your risk tolerance, time horizon, and retirement goals is an important part of building an effective retirement strategy.
Many plans also offer default investment selections for employees who do not actively choose their own investments. Reviewing these selections periodically can help ensure they still align with your goals and comfort with risk.
When Can You Contribute to a 401(k)?
You can typically begin contributing once you meet your employer’s eligibility requirements.
Some employers offer immediate eligibility, while others may require:
- A minimum age requirement
- A certain number of months worked
- Up to one year of service
Many employers also use automatic enrollment, which means employees are automatically enrolled at a default contribution rate unless they opt out or make changes.
If your plan uses automatic enrollment, it can be helpful to review:
- Your contribution percentage
- Your investment selections
- Whether your savings rate aligns with your retirement goals
2026 401(k) Contribution Limits
Employee Contribution Limits (2026)
- $24,500 elective deferral limit
- Additional $8,000 catch-up contribution for individuals age 50 and older
This means eligible workers age 50 and older can generally contribute up to $32,500 in 2026.
Under SECURE 2.0, individuals ages 60–63 may qualify for a higher catch-up contribution limit of $11,250 if their employer plan permits it.
If you participate in multiple retirement plans, such as more than one 401(k) or 403(b), your combined employee elective deferrals generally cannot exceed the annual IRS limit.
Total Contribution Limit (Employee + Employer)
In addition to employee contributions, employers may also contribute to a 401(k) plan through matching or profit-sharing contributions.
The combined annual limit for total employee and employer contributions is generally $72,000 in 2026, not including eligible catch-up contributions.
Can You Contribute to Both a 401(k) and an IRA?
Yes. Participating in a 401(k) does not prevent you from contributing to an IRA.
2026 IRA Contribution Limits
- $7,500 for individuals under age 50
- $8,600 for individuals age 50 and older
However, income limits and workplace retirement plan participation may affect:
- Whether traditional IRA contributions are tax deductible
- Whether you qualify to contribute directly to a Roth IRA
Reviewing both accounts together can help create a more coordinated retirement strategy.
What Are the Tax Advantages of a 401(k)?
Traditional 401(k)
- Reduces taxable income in the year contributions are made
- Contributions and earnings are taxed upon withdrawal
Roth 401(k)
- No upfront tax deduction
- Qualified withdrawals are tax free
Both contribution types offer potential tax advantages depending on your financial situation and retirement goals.
What About Employer Contributions?
Many employers offer matching or non-elective contributions to employee retirement accounts.
These contributions:
- Are generally made on a pretax basis
- May help increase retirement savings over time
- Are typically taxable upon withdrawal
Employer contributions may also be subject to a vesting schedule, meaning employees may need to remain with the company for a certain number of years before fully owning those contributions.
Your personal contributions are always 100% vested immediately.
What Happens to Your 401(k) When You Leave a Job?
When leaving an employer, you generally keep your vested 401(k) balance.
Depending on your situation, you may be able to:
- Leave the money in your former employer’s plan
- Roll the account into an IRA
- Roll the account into a new employer’s retirement plan
- Take a distribution (though taxes and penalties may apply)
Reviewing your rollover options carefully can help avoid unnecessary taxes and maintain alignment with your broader financial plan.
Other Important 401(k) Features To Understand
401(k) Loans
Some plans allow participants to borrow against their retirement savings.
Typically, loans are limited to:
- 50% of the vested account balance
- Up to a maximum of $50,000
Loans generally must be repaid with interest within a specific timeframe.
Hardship Withdrawals
Some plans allow hardship withdrawals for qualifying financial needs.
These withdrawals:
- May be taxable
- May incur a 10% early withdrawal penalty if under age 59½
- Can reduce long-term retirement savings
Because of the long-term impact, hardship withdrawals are generally considered a last resort.
Saver’s Credit
Some individuals may qualify for a federal Saver’s Credit for contributing to a retirement plan, depending on income and filing status.
Creditor Protection
401(k) assets generally receive federal creditor protection in bankruptcy proceedings.
Why Your 401(k) Strategy Matters
A 401(k) can be one of the most powerful tools available for long-term retirement planning. Contributing consistently, increasing savings over time, and taking advantage of employer contributions may help strengthen your long-term financial security.
However, a 401(k) should not be viewed in isolation. Investment choices, taxes, retirement income planning, and overall financial goals all play a role in how effectively your retirement strategy works together.
Bringing Your Retirement Plan Into Focus
Your 401(k) is one piece of your broader financial picture. Reviewing your contribution strategy, investment allocation, tax planning opportunities, and retirement goals together can help create a more comprehensive long-term plan.
At Navalign Wealth Partners, we help individuals and families make informed retirement planning decisions with clarity and confidence. Whether you’re evaluating contribution strategies, reviewing investment choices, or preparing for retirement transitions, our team is here to help guide you through the process.