401(k) glossary

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Testing & compliance

Prohibited transaction

Short definition

A prohibited transaction is a dealing between a retirement plan and a party in interest, such as the employer, a fiduciary or a service provider, that ERISA and the tax code ban unless an exemption applies.

What a prohibited transaction is

The law bars sales, leases and loans between the plan and a party in interest, the use of plan assets for a party in interest’s benefit, and any act in which a fiduciary deals with plan assets in their own interest. Exemptions allow ordinary plan business, including participant loans and paying a service provider reasonable compensation for necessary services.

Why it matters to employers

In small plans the most common prohibited transaction is depositing employee deferrals late, which is treated as a loan from the plan to the employer. The tax is 15% of the amount involved for each year, reported on IRS Form 5330, and rises to 100% if the transaction is not corrected. Fiduciaries can also be personally liable for losses. The Department of Labor’s Voluntary Fiduciary Correction Program gives a path to fix many of these.

Example

An employer holds $20,000 of deferrals for 45 days longer than allowed. The amount involved is the interest on $20,000 for the late period, not the $20,000. The employer deposits the lost earnings and pays the 15% excise tax on the amount involved.

Common mistakes

  • Using plan assets to pay for expenses that belong to the employer, such as the cost of designing the plan.

  • Hiring a business owned by a fiduciary or a relative without checking for an exemption.

  • Having the plan buy or lease property from the owner.

  • Ignoring small late deposits.

Sources

Internal Revenue Service: Retirement topics: Prohibited transactions (https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-prohibited-transactions), retrieved 2026-11-11 U.S. Code (govinfo.gov): 29 U.S.C. 1106: Prohibited transactions (https://www.govinfo.gov/content/pkg/USCODE-2023-title29/html/USCODE-2023-title29-chap18-subchapI-subtitleB-part4-sec1106.htm), retrieved 2026-11-11 U.S. Code (govinfo.gov): 26 U.S.C. 4975: Tax on prohibited transactions (https://www.govinfo.gov/content/pkg/USCODE-2023-title26/html/USCODE-2023-title26-subtitleD-chap43-sec4975.htm), retrieved 2026-11-11 U.S. Department of Labor, EBSA: Voluntary Fiduciary Correction Program (https://www.dol.gov/agencies/ebsa/employers-and-advisers/plan-administration-and-compliance/correction-programs/vfcp), retrieved 2026-11-11

General information, not legal or tax advice.

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901

© 2026 Basic Capital. All rights reserved.

Basic Capital Group, Inc. and its affiliates and subsidiaries (collectively, "Basic Capital") provide this website and its contents for informational and educational purposes only. The information on this website is general in nature and is not intended to address the circumstances of any particular individual or entity.  Nothing on this website constitutes investment, financial, legal, tax, or accounting advice, nor should it be construed as a recommendation or endorsement of any specific investment product, strategy, or service. Basic Capital does not provide legal, tax, or accounting advice. You should consult with your own qualified financial, legal, and tax advisors before making any investment decisions. Our site uses a third party service to match browser cookies to your contact information. We then use another company to send special offers on our behalf.

Recordkeeping Services

Recordkeeping services are provided through Basic Capital Recordkeeping Services LLC, a wholly owned subsidiary of Basic Capital Group, Inc. Unless expressly agreed to in writing, Basic Capital Recordkeeping Services LLC does not act as a fiduciary under the Employee Retirement Income Security Act of 1974, as amended, with respect to any employee benefit plan.

Investment Advisory Services

Investment advisory services are provided through Basic Capital Advisors LLC, a wholly owned subsidiary of Basic Capital Group, Inc. registered with the State of New York as an investment adviser. Registration does not imply a certain level of skill or training. Investing involves risk, including the potential loss of principal. Past performance is not indicative of future results.
Investments in securities are: Not FDIC Insured • Not Bank Guaranteed • May Lose Value.
Neither Basic Capital Advisors LLC nor its affiliates are a registered broker-dealer or engage in securities brokerage activities. Furthermore, Basic Capital Advisors LLC and its affiliates do not act as a broker-dealer.

Basic Capital, 52 Walker Street, 5th Floor, New York, NY 10013 | 888-460-4901