If you own a UK company that has paused trading, never quite got off the ground, or exists only to protect a name or hold an asset, you have probably asked the obvious question: does a dormant company still need to send anything to HMRC? The honest answer is that "dormant" is not as restful as it sounds.
Most of the confusion comes from one place. The word "dormant" means two different things to two different bodies, and your filing duties flow from both. What Companies House treats as dormant is not identical to what HMRC treats as dormant for Corporation Tax. So before you assume there is nothing to do, it is worth pinning down exactly what each side expects of you.
There is no single definition of a dormant company that applies everywhere. Instead, you are really dealing with two separate tests, and you can sit on different sides of each one.
For Companies House, a company is dormant when it has had no significant accounting transactions during a financial year. In plain terms, money has not moved in or out in a way that counts as trading or business activity. A small number of permitted transactions are usually ignored for this purpose, such as those tied to the company's formation, but anything that looks like ordinary trading will normally break dormant status.
For HMRC, the question is whether the company is active for Corporation Tax. Broadly, a company is dormant for Corporation Tax when it is not carrying on any business activity and is not receiving income. A company can be dormant in the eyes of Companies House and still be treated as active by HMRC in certain situations, which is exactly why it is dangerous to assume the two always line up.
Heads up - Being dormant for one regime does not automatically make you dormant for the other. Check both, not just the one that is easiest to satisfy.
This is where most owners want a simple yes or no, and the real answer hinges on one thing: whether HMRC has issued a notice to deliver a Company Tax Return.
If HMRC's records show your company as active, it will issue that notice. Once you have received it, you are obliged to file a return for the relevant period even if nothing happened in the company, typically as a "nil" return, until HMRC updates its records. The notice creates the obligation, and dormancy on its own does not cancel it.
On the other hand, if you have told HMRC the company is dormant and HMRC accepts that, it will usually stop issuing those notices. For the periods it agrees the company is dormant, you generally will not need to file a Company Tax Return at all.
A dormant company is not the same as an invisible one. Silence with HMRC is something you arrange, not something you can simply assume.
Here is the part that catches people out. Even a company that is fully dormant on both tests is not free of obligations to Companies House. "No Corporation Tax return" is not the same as "nothing to file."
A dormant company must still:
Heads up - Missing your Companies House deadlines can lead to penalties and, if ignored, to the company being struck off the register altogether. Dormancy does not protect you from late-filing consequences.
How to tell HMRC your company is dormant
If your company is genuinely not active for Corporation Tax, the sensible step is to tell HMRC rather than wait and hope the notices stop. You can notify HMRC that the company is dormant, and once accepted, this is what removes the requirement to keep filing Company Tax Returns for the dormant periods.
Until you have done this and HMRC has confirmed it, treat any notice to deliver a return as live. Ignoring it because "the company isn't doing anything" is one of the most common and avoidable mistakes a company owner can make.
The cheapest dormant company is the one where you told HMRC and Companies House exactly what was happening, before they had to ask.
Dormancy is rarely permanent. The moment your company starts trading, earns income, or begins any kind of business activity, it becomes active for Corporation Tax and the obligations change immediately.
At that point you will generally need to tell HMRC the company is now active, restart Corporation Tax obligations, and move from dormant accounts back to full statutory accounts. The earlier you flag the change, the less chance there is of a missed deadline or an unexpected penalty.
Heads up - Treat "going active" as a trigger to review everything at once: HMRC notification, accounts, record-keeping and your filing calendar. It is much easier to set this up correctly from day one than to unpick it later.
The trap with dormant companies is not usually the Corporation Tax return itself. It is the assumption that "dormant" means "nothing to do," which quietly turns into late dormant accounts, a missed confirmation statement, or an unanswered notice from HMRC.
TaxOptimiser helps you stay on the right side of both regimes by:
If you are not completely sure whether your dormant company owes anything to HMRC this year, the safest move is to check before a deadline checks for you. You can read the official position on dormant companies at GOV.UK and on filing duties at Companies House, and let TaxOptimiser handle the filings so your "dormant" company stays exactly that: quiet, compliant, and trouble-free.