As at vs. As of – Which is Correct?

As of is the standard phrase in American English for stating a condition, amount, or status at a particular date. As at is not wrong, but it is chiefly British and international business usage. Choose as of for American writing; use as at only when style or audience calls for it.

As at or As of – Which is Correct?

As of is the preferred phrase in American English when referring to a specific date or point in time. It can introduce the date on which information becomes accurate, such as “as of June 1” or “as of today.”

As at is also an established expression, but it is used mainly in British English, Commonwealth English, and international financial or accounting documents. For example, a British company might write “the balance as at March 31.” In American business writing, “the balance as of March 31” is more natural.

The Best Trick to Remember the Difference

Use as of when you mean “starting on” or “measured at” a particular date. Think of of as connecting information to its cutoff date: “the figures as of Friday.” Use as at only when following a British or international style, especially in formal accounts and reports.

Word	Part of Speech	Meaning	Example
as at	Fixed prepositional phrase	At a specified date; chiefly British or international usage	The accounts as at 31 March were audited.
as of	Fixed prepositional phrase	At or beginning on a specified date; standard in American English	The new policy applies as of July 1.

How to Use As of

As of identifies the date on which a statement, figure, rule, or situation is accurate. It is common in everyday conversation, business writing, legal documents, news reports, financial statements, and official announcements. The phrase can refer to a past date, the present moment, or a future effective date.

When it refers to a present status, as of now is common but sometimes unnecessarily wordy. In formal writing, “currently” or a specific date may be more precise.

Example 1: As of Monday, the library will close at 6 p.m.

Example 2: The company had 2,400 employees as of December 31, 2025.

Example 3: As of today, no final decision has been announced.

Etymology of the phrase as of

The phrase combines the preposition as, meaning “in the role or condition of,” with of, which can establish a point of reference. English has used as of for centuries to mean “from a specified time” or “at a specified date.” Its modern use became especially common in legal, administrative, commercial, and financial language.

Related Concepts

Understanding temporal prepositions and cutoff dates makes the difference between as at and as of easier to recognize.

• Temporal prepositions: Words such as at, on, by, and from show when something happens or applies. In “as of June 1,” the phrase identifies the relevant starting point or reference date.
• Cutoff dates: A cutoff date is the point at which information is measured or a rule takes effect. Financial reports often use “as of” to identify the date attached to their figures.
• Register and regional variation: Some phrases are grammatically valid but preferred in particular regions or professional settings. “As at” is more associated with British and international usage, while “as of” is the normal American choice.
• Effective dates: An effective date is when a policy, contract, fee, or law begins to apply. For example, “The agreement is effective as of January 1.”

Examples from Media and Literature

The phrase as of appears widely in reporting, public communication, business documents, and narrative writing:

• News reports often state, “As of press time, officials had not released further details,” to show when the information was last confirmed.
• Financial news articles commonly write, “As of Friday’s close, the stock had gained 8 percent,” linking a market figure to a specific date or time.
• Government announcements may say, “As of July 1, residents must use the updated application form,” identifying the beginning of a new requirement.
• Annual reports frequently use wording such as “As of December 31, the company held $12 million in cash,” connecting a financial figure to the reporting date.
• In narrative writing, a character may say, “As of today, everything has changed,” using the phrase to mark a turning point in the story.

As of Synonyms

Synonym	Definition
As of the date	At the particular date being discussed
Effective from	Beginning on a specified date, especially for a rule or policy
Starting on	Beginning at a particular future date
At the time of	At the point when a specified event or date occurred
Currently	At the present time; suitable when no specific date is needed

Frequently Asked Questions

Question 1: Is “as at” grammatically correct?
Yes. “As at” is grammatically correct, particularly in British English, Commonwealth English, and international accounting. However, American readers generally expect “as of.”

Question 2: Should I write “as at” or “as of” in an American business report?
Use as of. For example, write “The balance as of March 31 was $50,000.” This is the standard form in American business, financial, and legal writing.

Question 3: Does “as of” mean “from” or “at”?
It can mean either, depending on context. “Effective as of June 1” means beginning on June 1, while “The figures as of June 1” means the figures measured or recorded at that date.

Conclusion

As of is the best choice for standard American English when identifying a date connected to a status, figure, or effective change. As at is a valid regional alternative, especially in British and international financial writing. Pro Tip: In professional documents, match the phrase to your audience and style guide; consistent regional usage strengthens your credibility.