A US aircraft registration certificate is valid for 7 years from the date it was issued, not for as long as you own the aircraft. When that period ends, the certificate expires automatically — the FAA does not renew it for you, and nothing happens on its own if the owner does not act.
The rule, and why it changed
Under 14 CFR 47.40, the FAA extended the registration certificate's validity period from 3 years to 7 years, effective January 23, 2023. The change applied retroactively to certificates that had not yet expired on that date, so a certificate issued in, say, 2021 with an original 3-year window quietly gained 4 extra years without the owner doing anything.
Before 2023, a 3-year cycle meant re-registration paperwork came around often enough that owners, brokers, and title companies treated it as routine. The 7-year window is long enough that it is easy to lose track of — which is exactly when it becomes a pre-purchase issue.
Why this matters when buying an aircraft
An expired registration does not mean the aircraft was abandoned or unsafe. It usually means paperwork lapsed — the owner moved, the certificate got filed away, or the aircraft went into storage and nobody bothered to re-register it. But you cannot legally operate an aircraft with expired registration, and if you are buying one, you will need the seller to have current, valid registration (or handle the re-registration yourself) before you can fly it away.
Checking this takes ten seconds and should be step one of any pre-purchase review, before you spend money on anything else. Look up the tail number in the FAA Aircraft Registry and read the certificate issue date and status directly — do not assume based on how old the airplane looks or how long the seller says they have owned it.
What "valid" does not tell you
A current, valid registration only confirms that the ownership paperwork is in order. It says nothing about the airframe's condition, its accident history, or whether it has ever been substantially damaged and rebuilt under a different tail number. Those are separate questions, answered by separate records — which is exactly why a registration check and an accident-history check are not the same thing, even though both start with the same tail number.