A PO Box and a virtual office address both keep your home address off your letterhead, but they are not interchangeable. A PO Box only handles post. A virtual office gives you a real UK street address that can also serve as your company’s registered office — a PO Box cannot. This guide covers the practical differences, the legal restriction that rules a PO Box out for most company purposes, and how to decide which one fits your situation.
What a PO Box actually is
A PO Box is a numbered box at a Royal Mail delivery office or sorting office. You collect your post from there, or in some cases have it forwarded. It’s cheap, it’s simple, and it does one job: giving you a mailing address that isn’t your home.
What it doesn’t give you is a street address. Anything addressed to a PO Box arrives as a box number, not a building — which matters for the legal test below.
If you need a compliant business address without renting physical office space, explore our virtual office in Corby.
What a virtual office address is
A virtual office address is a real, staffed business address you can use for correspondence, marketing, and — subject to the provider meeting the right conditions — as your company’s registered office. Post sent there is received and signed for by someone at that location, then forwarded or held for collection, and most providers bundle in call handling or meeting room access alongside the address itself.
The distinction that matters for company registration is simple: a virtual office is a physical, staffed premises with an acknowledgeable delivery point. A PO Box is not.
The legal difference for Companies House
This is where the two options stop being a matter of preference. Since 4 March 2024, UK companies must use an “appropriate address” as their registered office under the Economic Crime and Corporate Transparency Act 2023 — and a PO Box does not qualify, because delivery there cannot be acknowledged by someone acting for the company (Companies House, “Get ready for changes to UK company law”; GOV.UK guidance on the Companies House register).
If your company’s registered office is currently a PO Box, Companies House can move it to a default address and give you 28 days to supply a compliant alternative before striking the company off the register.
A virtual office address can meet the appropriate-address test, provided the provider genuinely staffs the address and can acknowledge delivery — see Is a Virtual Office Legal for a UK Limited Company? for the full legal breakdown, including the conditions a provider needs to meet.
This rule applies specifically to your registered office and director’s service address. If you only need somewhere to receive personal mail and have no registration requirement attached to the address, a PO Box remains a legitimate option — it’s simply off the table the moment Companies House is involved.
Cost and practicality compared
| PO Box | Virtual office address | |
|---|---|---|
| Can be used as a registered office | No | Yes, if the provider meets the appropriate-address test |
| Address type shown | Box number | Full street address |
| Mail handling | Collection or basic forwarding | Received, signed for, scanned or forwarded |
| Additional services | None | Often includes call answering, meeting room access |
| Best suited to | Personal mail, non-registration use | Any UK limited company or LLP |
Which one do you need?
If you’re forming a UK limited company or LLP, a PO Box won’t get you through registration — you need a virtual office or another appropriate address from day one. If you’re a sole trader or individual who simply wants personal post kept separate from home, and there’s no company registration attached, a PO Box can still do the job at a lower cost.
For anyone weighing this up because they’re not sure their current address setup is compliant, it’s worth checking directly against the appropriate-address test before you commit either way.
If you’re setting up a limited company and need a compliant registered office, explore our virtual office in Corby for a professional UK business address.
FAQ
Can I use a PO Box as my registered office address? No. Since 4 March 2024, Companies House requires an “appropriate address” for every registered office, and a PO Box doesn’t meet that test because delivery there can’t be acknowledged by someone acting for the company.
Is a virtual office address legally different from a PO Box? Yes. A virtual office is a real, staffed street address capable of receiving and acknowledging post, which is why it can serve as a registered office. A PO Box is a collection point only.
What happens if my company is still registered at a PO Box? Companies House can move your registered office to a default address and give you 28 days to provide a valid alternative. Failure to do so can lead to the company being struck off the register.
Can I still use a PO Box for anything as a business owner? Yes, for personal or non-statutory mail where no registration requirement applies. It just can’t be used as your registered office or director’s service address.
Does a virtual office cost more than a PO Box? Typically yes, but it also does more — a compliant registered office, a professional street address, and often mail handling or call answering bundled in, rather than just a collection box.
