Sign off vs. Signed off – Which is Correct?
Sign off is the base form of the phrasal verb, while signed off is its past-tense and past-participle form. Use “sign off” for present, future, or infinitive constructions, and “signed off” for completed actions. Both are correct; the choice depends on the sentence’s tense and grammatical structure.
Sign Off or Signed Off – Which is Correct?
Sign off and signed off are both correct expressions, but they serve different grammatical purposes. Sign off is the base form and present-tense form of the phrasal verb. It can mean to end a message, approve something, or leave work. Signed off is the past-tense or past-participle form, showing that the action has already happened.
Use sign off after modal verbs such as will, can, and must, after to, and with plural or first-person present subjects. Use signed off when describing a completed action or when forming perfect and passive constructions.
The Best Trick to Remember the Difference
Use the time test: if the action is happening now, may happen later, or follows to, choose sign off. If the action already happened, choose signed off. A quick swap test is to replace the phrase with approve or finish a message: “I will approve it” becomes “I will sign off,” while “I approved it” becomes “I signed off.”
| Word | Part of Speech | Meaning | Example |
|---|---|---|---|
| sign off | Phrasal verb; base or present form | To approve, conclude a communication, or leave work | “Please sign off on the final design.” |
| signed off | Past tense or past participle | Approved, concluded a communication, or left work in the past | “The director signed off on the budget.” |
How to Use Sign Off
Sign off is a phrasal verb with several common meanings. In professional settings, it often means to approve a document, plan, purchase, or decision. It can also mean to end an email, letter, broadcast, or online message. In workplace contexts, especially in British and international English, it may mean to leave work at the end of a shift.
The expression is appropriate in both formal and casual communication, although the meaning depends on context. When approval is intended, it is often followed by on: sign off on a proposal. When ending a message, it can stand alone or be followed by a phrase such as with your name.
Example 1: The finance manager must sign off on the expenses before payment is released.
Example 2: I usually sign off with a brief thank-you at the end of my emails.
Example 3: The technician will sign off after completing the evening inspection.
What are the different forms of sign off?
Sign off is the base form and present-tense form. Its main forms are sign off, signs off, signing off, and signed off. Use signs off with a singular third-person subject, such as she signs off. Use signing off for continuous constructions, as in he is signing off. Use signed off for the simple past and past participle.
After a modal verb, use the base form: They must sign off, not They must signed off. After to, also use the base form: She agreed to sign off on the report.
Etymology of the word sign off
The verb sign comes from the Latin signum, meaning “mark” or “token,” through Old French and Middle English. The phrasal verb sign off developed from the idea of placing one’s signature on a document to indicate approval or completion. Its later use for ending a broadcast or message reflects the idea of marking the end of a communication.
How to Use Signed Off
Signed off indicates that the action is complete. It is the simple past form when a person performed the action at a specific time in the past: The editor signed off on the article yesterday. It is also a past participle in perfect constructions, such as has signed off, and in passive constructions, such as was signed off by the supervisor.
In approval contexts, signed off on is especially common in workplace, legal, technical, and administrative writing. In communication contexts, signed off means that someone ended a message, call, program, or broadcast.
Example 1: The project manager signed off on the revised schedule last Friday.
Example 2: Once the doctor had signed off, the patient could leave the facility.
Example 3: The news presenter signed off by thanking viewers for watching.
What are the different forms of signed off?
Signed off is not a separate verb from sign off; it is one of that phrasal verb’s forms. Use it as the simple past with subjects such as I, you, he, she, and they: They signed off on the contract. Use it as a past participle after auxiliary verbs: has signed off, had signed off, or was signed off.
Etymology of the word signed off
Signed off combines the past form of sign with the adverbial particle off. The phrase originally developed from the act of adding a signature to confirm approval or completion. Over time, it expanded to describe ending communications and formally concluding work or an activity.
Related Concepts
Understanding verb tense and phrasal-verb structure makes the difference between sign off and signed off much easier to recognize.
- Base form: The base form is the simplest form of a verb. It follows to and modal verbs, as in to sign off and must sign off.
- Past tense: The past tense describes an action that happened earlier. Signed off is the simple past form of sign off.
- Past participle: A past participle works with auxiliary verbs or in passive constructions, as in has signed off or was signed off.
- Phrasal verb: A phrasal verb combines a verb with an adverb or preposition. The particle off changes the meaning of sign in sign off.
Examples from Media and Literature
The expression appears in many familiar communication, workplace, and storytelling contexts. The following examples show how the tense changes with the situation:
- News and television: A presenter may sign off at the end of a broadcast by giving a final greeting or identifying the program’s next episode.
- Business reporting: An article about a corporate decision may state that a board or executive signed off on a merger, budget, or development plan.
- Workplace fiction: A character may need a supervisor to sign off on a leave request, expense report, or safety inspection.
- Letters and novels: A character can sign off a letter with a closing such as “Yours sincerely” or a personal name.
- Film and television dialogue: A character ending a phone call or radio transmission may say that they are signing off, while a narrator describing the completed exchange may say the character signed off.
Sign Off Synonyms
| Synonym | Definition |
|---|---|
| Approve | To officially accept or authorize something. |
| Authorize | To give formal permission for an action or decision. |
| Conclude | To bring an activity, message, or event to an end. |
| End | To finish a communication, broadcast, or activity. |
Signed Off Synonyms
| Synonym | Definition |
|---|---|
| Approved | Accepted or authorized in the past. |
| Authorized | Given formal permission previously. |
| Concluded | Brought to an end. |
| Finalized | Completed or formally settled. |
Frequently Asked Questions
Question 1: Is “sign off” or “signed off” correct?
Both are correct. Use sign off for the base or present form and signed off for a completed past action or a past-participle construction.
Question 2: Should I write “sign off on” or “sign off”?
Use sign off on when you mean approve something, as in The director will sign off on the proposal. Use sign off alone when you mean end a message, broadcast, call, or work period.
Question 3: Is “signed off on” grammatically correct?
Yes. Signed off on is a standard expression meaning approved or authorized, especially in professional and administrative writing.
Question 4: Which is correct after “will”: “sign off” or “signed off”?
Use sign off after will: The manager will sign off on the request. Modal verbs are followed by the base form of the verb.
Question 5: Is “sign-off” hyphenated?
When used as a noun or adjective, sign-off is often hyphenated, as in final sign-off or sign-off procedure. When used as a verb, write it as two words: sign off or signed off.
Conclusion
Sign off is the base or present form, while signed off describes an action that happened in the past or has been completed. Write sign off on for present or future approval and signed off on for completed approval. Pro Tip: Choosing the correct tense in professional messages makes your writing clearer and strengthens your credibility.
