What Is the Official Business “Penalty for Private Use $300”?

“Official Business, Penalty for Private Use $300” is a warning printed on U.S. government mail. It tells you the envelope, postcard, or label is authorized only for federal government business, and that anyone who uses it for a personal purpose can be fined $300 under 18 U.S.C. § 1719.¹ The “penalty” in the phrase is not aimed at the person receiving the mail. It is aimed at anyone who misuses the envelope.

Why Government Envelopes Say This

Federal agencies send a lot of mail without buying stamps or running envelopes through a postage meter. That mail moves through the postal system under an arrangement called penalty mail. The USPS defines it as mail “sent by U.S. government agencies, relating solely to the business of the U.S. government, which is authorized by law to be carried in the mail without prepayment of postage.”²

Not every part of the federal government uses penalty mail. The privilege is granted by statute to specific entities, including officers of the U.S. government, the Smithsonian Institution, and certain federal employment and census operations. Members of Congress do not use penalty mail; they have separate franking privileges.³

Because the taxpayer is effectively covering the postage, the law needs a way to keep the envelopes from being used for personal letters. That is what the printed warning does.

What the $300 Fine Actually Covers

The $300 figure comes from 18 U.S.C. § 1719, which makes it unlawful to use any official envelope, label, or postal endorsement to avoid paying postage on something that is not government business.¹ USPS puts it in plainer terms: the phrase refers to using penalty envelopes, cards, or meter stamps for any purpose “not relating exclusively to the business of the United States government,” whether by a private person, a company, or an organization.²

A few things follow from that.

The fine can apply to a federal employee who drops a personal letter into a penalty envelope. It can also apply to someone outside the government who somehow ends up with penalty stationery and uses it. The Domestic Mail Manual is direct: “the use of these items for matter not relating exclusively to the business of the U.S. government is prohibited.”⁴

The $300 is a flat statutory amount. It is not scaled to the value of the postage avoided, and it has been set at that figure for many years.

Where You Will See the Phrase

USPS regulations require every piece of penalty mail to display the words “Official Business” and “Penalty for Private Use $300” directly below the return address. The requirement runs across formats: permit imprint envelopes, stamped stationery, periodicals sent under penalty postage, Express Mail carrying penalty markings, and business reply mail. The wording has to be preprinted on the envelope, not handwritten or typed in later.⁴

If a piece of mail from a federal agency has arrived in your mailbox, you have almost certainly seen this language. Common examples include correspondence from the Social Security Administration, the IRS, and the Department of Veterans Affairs.

Does Receiving Penalty Mail Cost You Anything?

No. The warning is not a bill and not a threat directed at the recipient. You do not owe $300 for opening an envelope that was addressed to you, and you are not responsible for how the sender used its postage privileges. The fine attaches to misuse of the envelope itself, meaning taking a penalty envelope and sending personal mail in it.

Related Rules on Misusing Government Property

The envelope warning is one narrow piece of a larger rule that federal employees cannot use government property for personal purposes. Under federal ethics regulations, every employee has a duty to protect and conserve government property and to use it only for authorized purposes. The definition of “government property” is broad, covering office supplies, phones, computers, email accounts, social media accounts, printers, government records, vehicles, and even the services of contractor personnel.⁵

Many agencies allow a small amount of incidental personal use, such as a brief personal phone call or a short personal email. The ethics regulation recognizes those “limited or de minimis personal use” policies as creating authorized purposes.⁵ Each agency sets its own limits.

When misuse is more serious, the consequences climb well past $300. A federal employee who uses a government-owned or leased passenger vehicle for anything other than an authorized official purpose faces a mandatory suspension without pay of at least one month under 31 U.S.C. § 1349, and the agency head can extend the suspension or remove the employee.⁶ Knowingly converting government property to personal use, or stealing it, is a federal crime under 18 U.S.C. § 641, punishable by up to ten years in prison when the property is worth more than $1,000 in aggregate, and up to one year when it is worth less.⁷

Personal use of government property can also carry a tax cost. The IRS treats fringe benefits as taxable income unless a specific exclusion applies, so personal miles driven in a government vehicle typically get added to the employee’s W-2 wages.⁸

Reporting Misuse

Suspected misuse of government property is generally reported to the Office of Inspector General for the agency involved, and most agencies operate a fraud hotline. For misuse of GSA-managed vehicles, reports can go to howsmydriving@gsa.gov or to the GSA OIG hotline at 1-800-424-5210.

Federal employees who report waste, fraud, or abuse are protected from retaliation by 5 U.S.C. § 2302(b)(8), which bars personnel actions against an employee for disclosing information they reasonably believe shows a violation of law, gross waste of funds, or abuse of authority.⁹ Contractor employees have parallel protection under 41 U.S.C. § 4712 when they report fraud, waste, or abuse tied to government contracts or grants.

1
Office of the Law Revision Counsel. 18 USC 1719 – Franking Privilege
2
USPS. What is Official Mail (Penalty Mail)?
3
Office of the Law Revision Counsel. 39 U.S. Code 3202 – Penalty Mail
4
USPS. Domestic Mail Manual E060 Official Mail (Penalty)
5
eCFR. 5 CFR 2635.704 – Use of Government Property
6
Office of the Law Revision Counsel. 31 USC 1349 – Adverse Personnel Actions
7
Office of the Law Revision Counsel. 18 U.S. Code 641 – Public Money, Property or Records
8
Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits (2026)
9
Office of the Law Revision Counsel. 5 USC 2302 – Prohibited Personnel Practices