Does a dormant LLP need to file a tax return?

By Ben Davies · Updated 5 October 2026

Not automatically — but the question hides a trap, because the return an LLP can owe isn't the one most people search for.

An LLP doesn't file a CT600. It's tax-transparent: profits and losses are treated as belonging to the members, who are taxed on their own shares of them. There is no corporation tax return for an LLP, which is the single biggest difference from running a dormant limited company.

The return an LLP can owe is the SA800 — the Partnership Tax Return, filed under Self Assessment. A trading LLP files one each year reporting the profits allocated to its members. So "LLPs don't pay corporation tax" is true — and it is not the same thing as "LLPs don't file tax returns".

Whether an SA800 is due comes down to one thing: a notice to file. The notice — not the level of activity — is what creates the legal obligation. And here's the part almost everyone gets wrong: every LLP is registered with HMRC automatically when it's incorporated. There's no separate sign-up that happens when trading starts — Companies House incorporation feeds HMRC, a partnership record with its own UTR (10-digit tax reference) exists from day one, and notices to file go out against that record. A never-traded LLP can receive one, and plenty do.

That leaves any dormant LLP in one of two positions:

• No notice for the year. Nothing to file. Many dormant LLPs sit here — but it's the absence of a notice doing the work, not the absence of trading, so check the registered-office post rather than assuming.
• A notice has been issued. The return is legally due, dormant year or not, traded or not. DormantFile files the nil SA800 once Self Assessment is enabled in the LLP's Settings. What you can't do is ignore it.

Ignoring a notice is the expensive mistake. Late-filing penalties on a partnership return land on every member individually — £100 each from the day the deadline passes, climbing from there — and "the LLP wasn't doing anything" is not a defence once a notice has been issued.

One more wrinkle for completeness: an LLP that isn't carrying on a business with a view to profit can lose its tax transparency altogether and fall within Corporation Tax as a body corporate. In practice a dormant LLP has no income for that to bite on, but it's another reason never to bin a letter from HMRC.

What doesn't change in any of this: the LLP still files its annual accounts at Companies House, dormant or not, usually 9 months after its year end. That obligation belongs to Companies House and is entirely separate from anything HMRC does.

DormantFile files those dormant LLP accounts — and, once Self Assessment is enabled in Settings, the HMRC side too. If HMRC has issued a notice, DormantFile files the nil SA800 for a dormant LLP — members confirmed, statement included. An LLP with no notice has nothing to send anyone; we won't invent a return to sell you.

This is one of the few places an LLP and a company limited by guarantee — a flat management or RTM company, say — genuinely differ. A guarantee company doesn't get the tax-transparency an LLP has: it's within Corporation Tax scope like any other company, so the HMRC-letter question is a live one, not a formality. See does a flat management company need a CT600?

Read the full guide: How to file dormant LLP accounts with Companies House