Who isn’t allowed to accept your tip

By Eric, KindHow founder · Last reviewed August 2026

The short answer

Every calculator on this site answers how much. This guide is about the cases where the answer is capped or forbidden by somebody else’s rule, which no amount of generosity overrides — and where an envelope that is too generous puts the person in the position of having to refuse it in front of you.house judgment

• Your mail carrier — $20 per occasion, never cash.
• A public school teacher — capped by state ethics law, and Massachusetts publishes a hard figure.
• Your boss, if you are both federal employees — $10, non-cash, and the group cannot pool it.
• A wedding vendor whose contract already includes gratuity — you paid it; the second envelope is a second payment.

1. Your mail carrier

This is the one people get wrong most often, because the natural gesture — a card with cash in it — is the single thing the rule prohibits outright. The USPS Postal Bulletin states it in one sentence:sourced

“cash and cash equivalents, such as checks or gift cards that can be exchanged for cash, must never be accepted in any amount”

Carriers may accept a gift worth $20 or less per occasion, and no more than $50 from any one customer in a calendar year. The USPS ethics guidance is more specific than most summaries about what that permits: a retail gift card at or under $20 is an acceptable gift, while a Visa or American Express gift card is a cash equivalent and is not. The test is whether the card can be turned back into money.

Give instead: something consumable, a card for one shop that cannot be cashed out, or a written note naming what they actually do — which costs nothing and is the thing carriers report keeping.house judgment

2. A public school teacher

A public school teacher is a public employee, so a gift given because of their position runs into state ethics law. Massachusetts publishes the clearest figures, and they are lower than what a class of parents typically raises:sourced

• An individual gift must come in under $50 — the state prohibits a public employee accepting a gift worth $50 or more given because of their position.
• 930 CMR 5.08(14) lets a class give gifts “with an aggregated value of up to $150” across the whole school year — and only if the gift is identified as coming from the class, with who gave what not identified to the teacher.

A twenty-family class collecting $25 a head raises roughly $500, which is over three times the annual ceiling before the winter holidays have finished. That is the arithmetic the teacher gift calculator exists to run for you, with the cap applied.

Outside Massachusetts: most states have a rule and few publish a figure this clean, so the honest answer is that you have to check your own state ethics commission and your district’s policy. We say that rather than quietly applying the Massachusetts number nationally.house judgment

3. Your boss, if you are both federal employees

A federal employee may give an official superior items other than cash worth $10 or less per occasion — a birthday, the holidays — under 5 CFR 2635.304(a). The part that catches office collections is that a group gift does not pool the allowance: ten people at $10 each does not buy a $100 present.sourced

Genuinely special, infrequent occasions — a retirement, a transfer, a wedding, a bereavement — are treated differently under 304(b), with no dollar figure attached, but 304(c) still permits only contributions of nominal amounts and requires that everyone be told they may give less, or nothing at all. The group gift share calculator carries this rule as a selectable input and states the shortfall out loud.

4. A wedding vendor whose contract already includes gratuity

This one is not a prohibition — nobody has to refuse your money. It is that you have almost certainly already paid it. The IRS test separating a tip from a service charge turns on whether the payment was voluntary and whether you set the amount: a mandatory 20% line on a catering contract fails both, which makes it wages the venue owes its staff rather than a tip you have yet to give.sourced

So the useful question at a wedding is not “how much” but “did I already pay this?” — and the answer is in a document only you have. The wedding vendor tip calculator renders any vendor whose gratuity is in writing at $0 and keeps them on the ledger, so the zero is visible rather than an omission.

Sources

• USPS Postal Bulletin — Employee Tipping and Gift-Receiving Policy — the $20 per occasion and $50 annual figures, and the cash-equivalents sentence quoted above.
• USPS — Ethics FAQs, Gifts from Outside Sources — the retail-gift-card distinction.
• 930 CMR 5.08 — Massachusetts State Ethics Commission, exemptions relating to gifts — the $150 class aggregate and the anonymity condition.
• Massachusetts State Ethics Commission — Gifts to Public School Teachers and Staff — the state’s own plain-language summary for parents.
• 5 CFR 2635.304 — Exceptions (gifts between federal employees) — the $10 non-cash ceiling, the special-occasion exception, and the nominal-contribution condition.
• IRS — Tip recordkeeping and reporting (tips vs. service charges) — the four-part test separating a tip from a service charge.

Informational only. This guide reports published rules and labels our own reasoning as ours. It is not legal advice. Ethics rules vary by state, agency and district, and the figures above are the ones those bodies published as of this review — if you are the one who could be disciplined, check your own policy rather than this page. Last reviewed: August 2026.

More on how KindHow separates a source from a house call: the published methodology. Every guide is listed on the guides index.