Yes, an employer can automatically enroll you in a 401(k) without your signature, and for most newly established plans, federal law now requires them to do it. Your silence counts as consent: a set percentage of each paycheck goes into a retirement account unless you actively opt out. You keep the right to say no at any time, and if you miss the initial window, you have up to 90 days after your first contribution to pull the money back out.
Why It’s Legal Without Your Signature
The Pension Protection Act of 2006 amended ERISA to explicitly protect automatic contribution arrangements. State wage-deduction laws usually require written authorization before an employer takes anything out of your paycheck, but Congress built in a preemption clause: federal retirement law overrides any state rule that would prohibit or restrict automatic enrollment in a qualified plan.1Federal Register. Automatic Enrollment Requirements Under Section 414A Your employer does not need your state’s permission or your individual written consent to start contributions.
The preemption is narrow. It covers automatic enrollment in ERISA-governed plans, which includes most private-sector 401(k) and 403(b) plans.2U.S. Department of Labor. Automatic Enrollment 401(k) Plans for Small Businesses It does not give employers general authority to deduct whatever they want from your pay.
When Automatic Enrollment Is Required
Before 2025, auto-enrollment was optional. Section 101 of the SECURE 2.0 Act changed that. Most 401(k) and 403(b) plans established on or after December 29, 2022, must include automatic enrollment for all eligible workers. The requirement took effect for plan years beginning after December 31, 2024.1Federal Register. Automatic Enrollment Requirements Under Section 414A
Plans that existed before December 29, 2022, are grandfathered. Your employer can still add automatic enrollment voluntarily, and many have, but the federal mandate doesn’t reach them. The dividing line is when the plan was established, not when you were hired.
Employers That Are Exempt
Several categories of employers are outside the mandate even for plans created after the cutoff:
- Small businesses with 10 or fewer employees
- Companies that have been in existence for less than three years
- Church plans sponsored by religious organizations
- Governmental plans sponsored by state or local governments, which fall outside ERISA entirely
If your employer falls into one of these buckets, auto-enrollment is a choice rather than a requirement.
The Notice You Should Have Received
Your employer cannot start deducting money without telling you. Federal law requires a written notice explaining your right to opt out, the default contribution percentage, and how your money will be invested if you don’t pick your own funds.3Office of the Law Revision Counsel. 26 USC 401 – Qualified Pension, Profit-Sharing, and Stock Bonus Plans Treasury regulations require this notice at least 30 days, and no more than 90 days, before the start of each plan year.4Internal Revenue Service. Notice Requirement for a Safe Harbor 401(k) or 401(m) Plan For new hires, it usually shows up during onboarding or shortly after you become eligible.
Many employers deliver the notice through an online benefits portal or email. Federal regulations allow that as long as you have effective access to the system and are told you can request a paper copy at no charge.5eCFR. 26 CFR 1.401(a)-21 – Rules Relating to the Use of an Electronic Medium The notice may be buried in a first-week email or a benefits portal task list. The enrollment clock starts whether or not you read it.
What Comes Out of Your Paycheck
For plans covered by the SECURE 2.0 mandate, the initial default contribution must be at least 3% of your compensation and cannot exceed 10%.6Office of the Law Revision Counsel. 26 USC 414A – Requirements Related to Automatic Enrollment Common starting rates have been trending up, with many employers now defaulting at 6% instead of the old 3% baseline.
The number doesn’t stay put. Federal law requires automatic escalation: your contribution rate increases by 1 percentage point each year until it reaches at least 10% but no more than 15%.6Office of the Law Revision Counsel. 26 USC 414A – Requirements Related to Automatic Enrollment Increases typically happen at the start of the calendar year or on your plan anniversary. Someone auto-enrolled at 3% could be contributing 6% or 7% a few years later without ever making a change. Each bump triggers a new notice, but the increase goes through unless you override it.
Older plans structured as qualified automatic contribution arrangements follow their own caps, with the default rate limited to 10%.7Internal Revenue Service. Retirement Topics – Automatic Enrollment Either way, check your rate at least once a year.
Where the Money Gets Invested
If you don’t pick your own investments, your employer places contributions into a qualified default investment alternative. Federal regulations require these to be diversified options suitable for long-term retirement savings. Target-date funds are the most common choice; they shift from stocks toward bonds as you approach your expected retirement year. Employers cannot use a stable-value fund, money market account, or company stock as the default, because those don’t meet the diversification standard that protects both you and the employer from liability.2U.S. Department of Labor. Automatic Enrollment 401(k) Plans for Small Businesses
How to Opt Out or Change Your Rate
Opting out is usually straightforward. Log into your benefits portal (often run by Fidelity, Vanguard, or Empower) and set your contribution rate to 0%. Save the confirmation number or receipt. If the deduction continues on your next paycheck, that documentation is what you bring to HR.
If your plan doesn’t use an online portal, submit a paper election form to human resources. Processing a change usually takes one to two pay periods, so a deduction on the very next paycheck isn’t necessarily an error.
You don’t have to stop entirely. If the default is 6% and you can only afford 2%, lower the rate instead of zeroing it out. You can also change which funds your money goes into while keeping the same percentage. Contribution rate and investment allocation are separate elections.
After any change, check your next two pay stubs to confirm the adjustment went through. Payroll errors happen. If the old deduction keeps coming out, contact HR with the date and confirmation number of your election.
The 90-Day Window to Get Your Money Back
If you were auto-enrolled and didn’t opt out in time, federal law gives you a second chance. Under Section 414(w) of the Internal Revenue Code, you can request a permissible withdrawal of all default contributions and their earnings, as long as you make the election within 90 days of your first automatic contribution.8Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules The plan must allow at least a 30-day election window and cannot extend the deadline past 90 days.
A few consequences come with pulling the money back:
- The withdrawal is included in your gross income for the year you receive it.8Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
- The 10% early distribution tax that normally applies to withdrawals before age 59½ does not apply.8Office of the Law Revision Counsel. 26 USC 414 – Definitions and Special Rules
- Any employer matching contributions tied to those deferrals go back to the employer.
Your plan administrator reports the withdrawal on Form 1099-R using distribution Code 2, which signals to the IRS that an exception to the 10% penalty applies.9Internal Revenue Service. Instructions for Forms 1099-R and 5498 If your form shows a different code, ask the administrator to correct it before you file.
The 90-day deadline is firm. After it passes, the contributions are locked in under the plan’s normal distribution rules; you generally cannot touch them until you leave the employer, reach age 59½, or qualify for a hardship withdrawal.
If Your Employer Got It Wrong
Mistakes run in both directions. Sometimes an employer fails to auto-enroll a worker who should have been included. Sometimes it keeps deducting after a valid opt-out.
For missed enrollments, the IRS has a correction framework. If the employer catches the failure quickly (within about nine and a half months after the plan year the error occurred), it may owe nothing beyond starting correct contributions going forward. If the error lasts longer, the employer is generally required to make a corrective contribution to your account equal to 25% or 50% of the deferrals you missed, depending on timing.10Internal Revenue Service. 401(k) Plan Fix-It Guide – Eligible Employees Were Not Given the Opportunity to Make an Elective Deferral Election That contribution is fully vested immediately.
If deductions continued after you opted out, bring your confirmation number and election date to HR and ask for immediate correction. Excess contributions should be returned to you. Persistent issues that HR won’t resolve can be reported to the Department of Labor’s Employee Benefits Security Administration.
Part-Time Workers Are Now Included
Automatic enrollment used to exclude many part-time workers because employers could require 1,000 hours of service in a year before allowing participation. SECURE 2.0 lowered that threshold. Starting with the 2025 plan year, employees who work at least 500 hours in two consecutive years must be allowed into the plan. A worker who logged 500 or more hours in both 2024 and 2025, for example, becomes eligible on January 1, 2026.
If you work roughly 10 hours a week and have been with the same employer for two years, you may find yourself auto-enrolled for the first time. The same notice requirements and opt-out rights apply. The process for stopping contributions on a part-time paycheck is the same one full-time employees use.