A domain name is technically leased on an annual or multi-year basis, not owned outright the way the word "ownership" implies. Letting the registration lapse, even briefly, creates a real risk that someone else, sometimes a domain reseller specifically watching for expired names, registers it before the original owner can renew.
Why this happens more often than it should
The most common cause isn't forgetfulness about the domain itself, it's an expired credit card on file, or a renewal notice email that landed in spam and was never seen. The business owner often doesn't realize anything's wrong until the website or business email suddenly stops working.
Know who actually controls the renewal
For many small businesses, a developer or agency registered the domain on the business's behalf, sometimes under the developer's own account rather than the business's. It's worth directly confirming: whose name is the domain registered under, and who receives the renewal notices?
Set the domain to auto-renew, with a payment method that's actually current
Most registrars offer auto-renewal. It's a simple, largely free safeguard, but it only works if the payment method on file is valid, which is worth checking periodically rather than assuming.
Consider a longer registration period
Registering a domain for multiple years at once, rather than one year at a time, reduces how often the renewal risk comes up at all, since there are simply fewer renewal dates to potentially miss.
What to do if a domain does lapse
Some registrars offer a short grace period, sometimes with a redemption fee, before a lapsed domain becomes available to the public. Acting immediately, the moment a lapse is discovered, gives the best chance of reclaiming it before someone else does.
Questions
Can someone really just buy my domain the moment it expires?
After any grace and redemption periods a registrar offers (which vary), yes, an expired domain can become available for anyone to register, including automated services that specifically monitor for expiring domains.
Should I register my domain for the maximum period allowed?
It's a reasonable, low-cost way to reduce the number of renewal dates you need to track, though it's not strictly necessary if auto-renewal with a valid payment method is reliably in place.
Where should I check who owns my domain?
A WHOIS lookup shows registration details, though privacy protection services (common and often free with registration) can mask the underlying contact information from public view while your registrar account still shows you the real details.