First come, first served vs. first serve: which is right?

The short answer

The historically correct form is first come, first served, meaning that whoever arrives earliest is helped, seated, or supplied first, as in seating is first come, first served, so arrive early. First come, first serve, without the d, is a widespread variant that many speakers now use and understand the same way, but careful writers and style guides still favor served, because it correctly casts the arriving person as the one being served.

• Standard: first come, first served
• Common variant: first come, first serve

Why served is grammatically logical

In first come, first served, served is a passive past participle: the first person to come is the first person who gets served, the same construction as the first one done wins. Serve, without the d, would suggest that the first person to arrive does the serving themselves, which is not what the phrase means. That small grammatical detail is why served remains the form preferred in dictionaries and formal writing.

Compare it with similar structures such as first in, first out, used in accounting and inventory management, which follows the same first-then-first logic without any ambiguity about who acts on whom. Recognizing this shared pattern across related phrases makes it easier to remember why the passive served, not the active serve, correctly closes out first come, first served.

How the variant became so common

First come, first serve likely spread because served and serve sound almost identical when spoken quickly, especially with the d blending into the following pause. Over time, serve became common enough in speech and informal writing, including on signs and websites, that many readers now see it as an accepted alternative rather than an error. Even so, in resumes, contracts, or edited publications, first come, first served is the safer, more traditional choice.

Using the phrase correctly

Use first come, first served to describe any system where earlier arrival guarantees priority, such as seating, registration, or limited stock: tickets are available on a first come, first served basis. Hyphenate it as a compound adjective before a noun, as in a first-come, first-served policy, but leave it unhyphenated when it follows the noun it describes.

The phrase turns up constantly in customer service, event planning, and retail, wherever no other ranking system applies. A bakery might post a sign reading fresh loaves are first come, first served, and a help desk might explain that support tickets are handled first come, first served rather than by urgency. In each case, the wording tells customers that arrival time, not status or special request, decides the order.

Remember it

Think of a waiter serving customers in the order they sit down: the first person seated is the first person served, which is exactly the logic behind first come, first served. If you can mentally add by the staff after serve, as in first come, first served by the staff, you will remember why the d belongs.