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Registering your company at Companies House feels like the big milestone. In reality, it is only the start. Once your limited company exists, HMRC expects you to deal with tax, records, and reporting in the right order. In 2026, that matters even more because the old joint online accounts-and-tax-return filing service closed on 31 March 2026.
For UK SMEs, the main risk is assuming incorporation alone means everything is sorted. It does not. Companies House creates the company. HMRC still expects you to manage Corporation Tax, payroll, VAT where relevant, and ongoing filing deadlines.
1) Check whether you were set up for Corporation Tax
When you register a company with Companies House, you will usually be set up for Corporation Tax at the same time, unless the company is dormant. If that did not happen, you need to add Corporation Tax services to your business tax account yourself.
That is the first thing to verify after incorporation: can you actually access your company's Corporation Tax service online? If not, fix that early. Leaving it until your first deadline approaches is how new directors get caught out.
2) Tell HMRC when you actually start doing business
This is where many first-time founders slip up. Your company can exist before it starts trading. HMRC says you should add Corporation Tax services when you start to do business, and that includes not just making sales, but also things like buying stock, advertising, renting property, or employing someone.
So if you incorporated today but have not yet traded, you may still be dormant for Corporation Tax. But the moment you start business activity, HMRC expects you to recognise that status change and deal with Corporation Tax properly. If your company was dormant after setup and then began trading later, you tell HMRC the date you started trading when you add Corporation Tax services to your business tax account.
3) Know your first Corporation Tax deadlines now, not later
HMRC works to its own timetable, and it is different from Companies House deadlines. For a private limited company, the main dates are:
- Pay Corporation Tax 9 months and 1 day after the end of your accounting period.
- File the Company Tax Return 12 months after the end of that accounting period.
Your accounting period for Corporation Tax cannot be longer than 12 months and is usually aligned with your accounts period, though it can differ in the first year. That first year often catches people out because they may need to file two Company Tax Returns to cover the first accounts period.
In other words, "I only just registered" is not a defence HMRC accepts once those dates arrive.
4) Keep proper records from day one
HMRC expects limited companies to keep records that support their tax filings. Practically, that means you should separate business and personal finances immediately, keep invoices and receipts, track expenses, and maintain bookkeeping that lets you prepare accounts and Corporation Tax returns accurately. HMRC's limited company guidance makes clear that directors are responsible for keeping company records and filing the required returns.
This is not just admin hygiene. It is what allows you to claim allowable expenses and reliefs correctly and avoid scrambling at year end. HMRC has a dedicated collection covering allowances, expenses and reliefs for limited companies.
5) Register for PAYE before the first payday
The next HMRC expectation depends on how you plan to take money out of the company. If the company will pay anyone a salary, including you as a director in many cases, you may need to register as an employer and run PAYE. GOV.UK says you must register for PAYE if, for example, an employee is paid GBP96 or more a week, gets expenses or benefits, has another job, receives a pension, or has received certain state benefits.
You must register before the first payday, and you cannot register more than 2 months before you start paying people. Even a one-director company can need employer registration if it is paying that director through payroll.
For many new SMEs, this is the first real HMRC process after incorporation: getting payroll live before any salary is paid.
6) Watch your VAT position early
Not every newly incorporated company needs VAT registration straight away. But HMRC expects you to monitor it from the beginning. You must register for VAT if your taxable turnover goes over GBP90,000 in the last 12 months, and you normally have to register within 30 days of the end of the month in which you crossed the threshold.
That matters for fast-growing SMEs because the threshold test is rolling, not tied neatly to your year end. A business can hit the VAT obligation much sooner than the founder expects.
7) Do not confuse HMRC deadlines with Companies House deadlines
New directors often think annual filing is one single task. It is not. Companies House and HMRC have separate deadlines.
For Companies House, a private company's first accounts are generally due 21 months after incorporation, annual accounts after that are usually due 9 months after the financial year end, and the confirmation statement must be filed at least every 12 months and within 14 days of the end of the review period.
For HMRC, the Corporation Tax payment and Company Tax Return deadlines are separate and usually earlier than many founders realise. Missing one does not excuse missing the other.
8) In 2026, filing got more manual
A practical 2026 change is easy to miss: the joint Companies House/HMRC online service for filing accounts and Company Tax Returns closed on 31 March 2026. That means companies now need to use commercial software or other accepted routes instead of relying on the old combined online tool.
For newly registered SMEs, this means HMRC effectively expects you to have your filing process sorted earlier. Do not wait until the deadline month to find out your old assumptions about filing no longer work.
9) Identity verification matters too
This is a Companies House requirement rather than an HMRC tax rule, but it now sits right alongside your post-incorporation admin. From 18 November 2025, identity verification became a legal requirement, with a 12-month transition period. Directors and people with significant control must verify their identity and use their personal code for relevant filings and appointments.
It is not a tax filing, but it is part of the compliance environment every newly incorporated company now has to manage in 2026.
10) What HMRC really wants from new companies
In simple terms, HMRC expects a new limited company to do five things well:
Incorporate properly, activate Corporation Tax correctly, tell HMRC when trading starts, register for PAYE or VAT when required, and keep records good enough to file and pay on time. That is the real checklist.
Final thought
If you have just registered at Companies House, do not treat incorporation as the finish line. Treat it as the trigger for your HMRC setup. The best-run SMEs handle this in the first few weeks: they confirm Corporation Tax access, decide whether the company is dormant or trading, set up bookkeeping, register payroll if needed, and diary every deadline immediately.
That is what HMRC expects next, and getting it right early is far easier than fixing it later.
This article is for general information and reflects UK guidance available as of 15 April 2026.