US Tax Filing and Compliance

All You Need to Know About 401(k) Plan

autohr img By Varun Gupta | Last Updated : 24 Oct, 2025

401(k) Plan

A 401(k) plan is one of the most popular tax-benefit retirement savings plans in the USA. This retirement savings plan is sponsored by US companies for their employees. Additionally, along with the US citizens, the 401(k) plan is also available to non-resident aliens who, while staying there, worked for a US company. While helping employees save for the future, this plan also includes several tax advantages.

Further, here is a quick guide to help you better understand the 401(k) plan, how it works, its different types, withdrawal rules, and more. 

Key Takeaways
  • A 401(k) is a company-sponsored retirement plan for its employees. It helps employees to save a specific amount from their income till they reach their retirement age.
  • The 401(k) plans are of two types, i.e., traditional and Roth 401(k) plans, and are taxed differently.
  • Employees can contribute to both traditional and Roth 401(k) plans. However, for this, they need to follow specific contribution limits as per the tax year. 
  • For early withdrawals from 401(k) plans without a tax penalty, taxpayers need to follow certain rules. These rules are the same for US residents and non-resident aliens. 
  • Further, if you quit the job and have a 401(k) plan, you can either roll over into an IRA or a new 401(k) plan. Additionally, you can leave it there till its maturity; however, you cannot make contributions to it. 

What is a 401(k) Plan?

A 401(k) plan is a retirement savings plan in the USA that US companies sponsor for their employees. Under this, employees from their income need to contribute a specific amount to an investment plan to save for retirement. Also, the employee makes his contribution to this retirement plan up to a specific limit. 

Additionally, this investment plan is also available for non-resident Indians who work for a US company while staying there. Further, the rules, regulations, working, and tax deductions of 401 (k) are the same for both US citizens and non-resident aliens. 

So, in simple words, a 401(k) plan is an investment that employees save from their income to use after retirement. Further, let's know how this investment plan works for employers. 

Do You Know?

Depending on their visa type and residential status, non-resident aliens can also participate and contribute to the 401(k) plan. Like the US citizens, the same withdrawal and contribution rules apply to them, such as withdrawing the amount after turning 59½, and more. 

How Do 401(k) Plan Works For Employers?

Here is how 401(k) plan works for employers:

How Do 401(k) Plan Works

  • When you agree to invest in a 401(k) plan, you need to pay a fixed amount from your monthly paycheck. 
  • You have the option to choose your investments. Generally, based on what your employer's plan offers, you can select target-date funds or other mutual funds. These are designed to decrease the risk of losses as the employee moves towards retirement.
  • Your invested money in the 401(k) plan grows tax-deferred. It means you are not required to pay capital gains tax on the profits you earn from this plan.
  • Additionally, as a part of an employer benefit, some employers may match part or all of your contributions. It is free money that the employer added to your retirement plan.
  • Depending on your retirement plan, after your retirement on your withdrawals need to pay taxes. 

Further, with the start of 2025, many employers enrolled their eligible employees at a 3% to 10% contribution rate into the existing 401(k) and 403(b) plans. Until this contribution rate reaches 15%, it will increase annually. It is a change introduced by the Secure 2.0 Act. This plan helps employees save for their retirement. 

Additionally, the working of the 401(k) plans remains the same for US citizens and non-resident aliens. Now, moving ahead, let's know the different types of these plans. 

What Are the Different Types of 401(k) Plans?

The 401(k) plans are generally of two types, i.e., traditional and Roth 401(k). The traditional 401(k) plan is funded with pretax money, while the Roth plan is taxed after contributions. Additionally, the type of plan you choose determines your tax benefits. Also, whether you received it now or after your retirement.

Further, let's better understand both the 401(k) plans by differentiating them.

Basis Traditional 401(k) Plan Roth 401(k) Plan
Contribution Limits

The 401(k) contribution limit is the same for both traditional and Roth. Considering this, in 2025, you can contribute a maximum of $23,500. 

Additionally, people who are 50 years or older can contribute an additional $7,500 ($31000) as a catch-up contribution. Further, because of the Secure 2.0 Act, people aged between 60 to 63 can catch-up contribution of $11,250. 

Also, you can make contributions to both retirement plans in the same year as long as your contribution is within the limit. 

Tax treatment of contributions Contributions are calculated before the tax deduction. This further results in reducing your present adjusted gross income (AGI). With zero impact on your present adjusted gross income (AGI), contributions are determined after tax deduction. Considering this, the employer-matching dollars should be stated on the pretax account, and when distributed, they should be taxed.
Tax treatment of withdrawals Withdrawals are taxed as ordinary income after retirement.  After retirement, on qualified distributions, no taxes are paid. 
Withdrawal rules

Have to pay taxes on withdrawals of earnings and contributions. If the distribution is taken before the age of 59½, unless one of the IRS exceptions is fulfilled, you need to pay tax on it. 

Further, after a certain age, account holders in a traditional 401(k) plan must take required minimum distributions. 

As long as the IRS does not qualify the distribution, withdrawals of earnings and contributions are not taxed. Considering this, the retirement account should be held for at least five years, and the distribution is:

  • On or after age 59½.
  • Due to death or disability.

Also, these retirement plans do not have a minimum distribution. 

These were the key differences between a traditional 401(k) plan and a Roth 401(k) plan. Moving ahead, now let's know the contribution limits of the 401(k) plan for 2025. 

Contribution Limits of 401(k) Plan for 2025

Here are the contribution limits of the 401(k) plan for 2025 for US citizens and non-resident aliens:

Basis 401(k) Plan Contribution Limits for 2025
Employee Contribution Limit $23,500
For individuals age 50 and older, the catch-up contribution limit $7,500 or up to $11,250 for those individuals who are between 60 to 63 years. 
Maximum employee and employer contribution Those under 50 years can contribute up to $70,000 (those who are 50 years or older can contribute up to $77,500) or full employee compensation. 

Further, the last day for contributing to the 401(k) plan in 2025 is December 31. Additionally, you can contribute any amount to a 401(k) plan without any income limit restrictions. 

Also, compared to individual retirement accounts (IRAs), a 401(k) plan has higher annual contribution limits. The contribution limit of an IRA is $7000, and who are age 50 years or older is $8000 in 2025. 

Are you still thinking about how much you should contribute to your 401(k) retirement plan? Then, according to financial experts, you should contribute 10% to 15% of your earned income to your 401(k) plan. If it is more than your income, then, as per your choice, you can contribute the amount.

So, this was all about the contribution limits of the 401(k) plan for 2025. Moving ahead, let's know the 401(k) pros and cons.

Withdrawals Rules for 401(k) Plan

The withdrawals rules for 401(k) plan are as follows:

Withdrawals Rules for 401(k) Plan

  • Before reaching the age of 59½, if you withdraw an amount from your 401(k) plan, you may need to 10% penalty. It is charged for early withdrawal. 
  • To qualify for early withdrawals, you should be at least 59½ years old, qualify for a hardship withdrawal, or have a qualifying disability. Additionally, when you file your taxes, as part of your income, you should include this withdrawal amount.
  • Additionally, if you fulfill certain criteria, you may take a penalty-free withdrawal. It includes adopting a child, facing economic issues from a federally declared disaster, or becoming disabled.
  • Also, you can withdraw up to $1000 per year as an emergency expense without paying the 10% early penalty. Considering this, if this amount is not repaid within three years, then over those three years, you will not get the extra emergency distribution.

Furthermore, in many cases, taxpayers still have to pay taxes on their early withdrawals from 401(k) plans. Additionally, to invest over time, they have less money. 

So, these were the common withdrawal rules for 401(k) plans that you need to follow. Moving further, let's know the required minimum distributions for these retirement plans. 

Required Minimum Distributions for 401(k) Plan

Once you turn 73, then taking withdrawals from your 401(k) plan is not your choice but your right. Here, the required minimum distributions are the amounts you should withdraw from your retirement plan. However, if you are still working and opt to defer until your retirement, this is optional.

Also, you can withdraw an amount more than the minimum limit of the 401(k) plan. As a part of your income, these distributions are taxed when you file your tax returns. Considering this, if you choose the Roth 401(k) plan, then you do not have any required minimum distributions. 

This was all about the required minimum distributions. Moving ahead, let's know what happens to your 401(k) plan if you quit your job. 

What Happens to my 401(k) Plan if I Quit My Job?

In case you quit your job, then you can take the money from your 401(k) plan with you. Additionally, you can either roll the money into an IRA or a new 401(k) employer plan. 

  • If you completed rollovers within 60 days of withdrawal, then you do not need to pay tax on that.
  • You can also opt to leave your 401(k) plan with your old employer's plan. However, after quitting your job, you cannot contribute to it.

Further, if you are a non-resident alien with a 401(k) plan and planning to return to India, then you can cash out your money from the plan. Additionally, you can roll over your 401(k) plan to an IRA or leave the plan till you turn 59½ to make penalty-free withdrawals.

Final Thoughts

Lastly, a 401(k) is a retirement plan that employers sponsor for their employees. It helps them save a certain amount for their retirement. Considering this, a specific amount is deducted monthly from the employee's income to contribute to the retirement plan. Additionally, the 401(k) plan has the same rules for residents and non-residents in the US.

Further, the complete blog was about the 401(k) plan. If you still have confusion or want to know more about this plan, connect with Savetaxs. Our experts will solve all your queries related to this plan and provide you with comprehensive details on it.

Note: This guide is for informational purposes only. The views expressed in this guide are personal and do not constitute the views of Savetaxs. Savetaxs or the author will not be responsible for any direct or indirect loss incurred by the reader for taking any decision based on the information or the contents. It is advisable to consult either a CA, CS, CPA, or a professional tax expert from the Savetaxs team, as they are familiar with the current regulations and help you make accurate decisions and maintain accuracy throughout the whole process.

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Varun Gupta (CA & CPA)

Mr Varun is an Enrolled Agent (IRS) and Certified Accountant with over 13 years of experience in US taxation, accounting, bookkeeping, and payroll. Mr Gupta has not prepared and reviewed over 5000 individual and corporate tax returns for CPA firms and businesses.

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Frequently Asked Questions

No matter what your source of income is, we've got you covered. There’s a plan for everybody!

Yes, Non-resident Indians Who Work for a U.s. Company Can Participate in a 401(K) Retirement Plan. The Eligibility of the Plan is Determined by the Taxpayer's Employment Status With the Us Company, Not by Their Citizenship. Additionally, the Contribution and Withdrawal Rules Remain the Same for Residents and Non-residents in the Us.

After Turning 59½, You Can Start Withdrawing From Your 401(K) Plan Without Any Penalty. However, Before This Age, if You Make a Withdrawal From Your 401(K) Plan, You Are Liable to Pay a 10% Penalty and Taxation at Ordinary Income Tax Rates.

The 401(K) Plan Contribution Limit for Employees Under 50 is $23,500, and the Combined Employee and Employer Limit is $70,000 in 2025. Further, for Employees Who Are 50 Years or Older, the Contribution Limit is $31,000, With a Catch-up and Combined Employee and Employer Limit is $77,500.

A Solo 401(K) is a Retirement Plan Designed for Small Business Owners With No Full-time Employees and Self-employed Individuals With No Employees. Considering This, the Rules and Regulations of These Plans Are the Same as Any Other 401(K) Plan. Additionally, This Retirement Plan Covers Both You and Your Spouse.

Yes, You Can Have More Than One 401(K) Account, but for This, You Need to Fulfill the Requirements. If You Have Multiple Jobs With Different Employers, and Your Contribution Limit is Imposed on All Your 401(K) Plans, Then Having Multiple 401(K) Accounts is a Normal Thing. However, the Contribution Limits for All Your Accounts Will Be the Same Annual IRS Limits.

Yes, You Can Stop Contributing to Your 401(K) Anytime at Your Discretion. For This, With Your Hr Employer Department, You Need to Change the Contribution Amount to 0%.

Yes, You CChange Your 401(K) Investment Options Anytime. To Do So, You Need to Rebalance With Your Current 401(K) Plan, or After Leaving Your Job, You Can Roll Over the Money Into an Ira, Which Offers You a Wide Range of Investment Options.

When You Die, Your 401(K) Plan is Transferred to the Beneficiary You Named on Your 401(K) Account. Considering This, for Managing the Funds, the Recipient's Options Depend on Whether They Are Your Spouse, a Non-spouse, or an Estate.

No, You Cannot Contribute to Your 401(K) Plan After Retirement, as This Plan Requires Active Salary From Your Current Employer. Additionally, After Retirement, You Can Leave Your Money in Your 401(K) Plan and Continue to Grow It Tax-deferred. Further, You Can Separately Contribute to an Ira if You Have Income From Other Sources.

Generally, the 401(K) Plan Fees Range From 0.5% to 2% and Can Vary Greatly, Depending on the Size of Your 401(K) Plan, the Plan Provider, and the Number of Participants.
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