Companies House issued 303,412 late filing penalties in 2025/26, including 73,374 double penalties for firms that had already been caught out the year before. Between January and March 2026 alone, 360 directors across 332 companies were convicted for filing offences. Year-end accounts don’t fail because the work is difficult. They fail because a step gets skipped, a deadline gets miscounted, or a new regulatory requirement land without anyone noticing until it’s too late.Â
Theis year-end accounts preparation UK checklist runs through the process in the order it should actually happen, from confirming the deadline to filing the finished accounts, including a step most firms haven’t fully built into their workflow yet.Â
1. Confirm the accounting reference date and both filing deadlines
Every checklist starts here, and it’s still where mistakes happen most. Statutory accounts are due at Companies House nine months after the accounting reference date, while the Company Tax Return and Corporation Tax payment run on a separate twelve-month clock from the accounting period end, with payment itself due nine months and one day after the period ends. Confirming both dates in writing at the start of the engagement, rather than assuming they align, avoids the scramble that happens when a team realises the CT deadline arrived before the accounts were even finalised.Â
2. Verify director and PSC identity status before anything else
This step wasn’t on last year’s checklist, and it needs to be on this one. Under the Economic Crime and Corporate Transparency Act, every director, LLP member, and person with significant control must verify their identity with Companies House. The transition period closes on 17 November 2026, after which Companies House is expected to begin compliance activity against those who remain unverified. Â
As of Companies House’s own management information published in July 2026, only 55% of directors, 50% of LLP members, and 42% of PSCs had completed verification. An unverified director can hold up a confirmation statement filing, and confirmation statements often sit right alongside year-end accounts on the same client’s calendar. Checking this status at the start of the engagement, not the week before filing, avoids a last-minute registry block.Â
3. Reconcile the balance sheet accounts first
Bank reconciliations, debtor and creditor listings, and any intercompany balances need to tie out before anything else in the accounts can be trusted. This is the foundation the rest of the financial year-end process UK accounts rely on, and starting here rather than with the profit and loss account catches most data errors before they propagate through every other schedule.Â
4. Finalise the fixed asset register and depreciation
Additions and disposals during the year need to be matched against invoices and disposal proceeds, and depreciation policies applied consistently with prior years unless there’s a documented reason to change them. A fixed asset register that hasn’t been touched since the previous year-end is one of the most common sources of a qualified conversation with a client later.Â
5. Value stock and work in progress
Stock valuation needs to reflect the lower of cost and net realisable value, with any obsolete or slow-moving stock written down and documented. For service businesses, work in progress needs the same scrutiny, since an inflated WIP figure overstates both the balance sheet and the year’s profit.Â
6. Review accruals, prepayments and deferred income
Costs incurred but not yet invoiced, payments made in advance for future periods, and income received but not yet earned all need adjusting entries before the accounts reflect the year accurately. This is one of the easier steps to rush, and one of the easiest to get wrong when it’s rushed.Â
7. Check director's loan accounts and related party disclosures
Any movement on a director’s loan account needs to be traced and disclosed correctly, particularly where a balance has moved from overdrawn to repaid, or vice versa, close to the year-end. Related party transactions more broadly need the same attention, since incomplete disclosure here is a recurring theme in FRC audit quality reviews of smaller company accounts.Â
8. Confirm which accounting standard applies, and flag any changes
Most UK small companies prepare accounts under FRS 102 or, for micro-entities, FRS 105. Confirm which standard applies to each client, and check for any amendments effective for the current accounting period before assuming last year’s template still fits. A standard’s requirements shifting mid-cycle is exactly the kind of change that slips through when a firm is working from a static checklist rather than checking current guidance each year.Â
9. Draft the accounts and corporation tax computation together
Preparing the statutory accounts and the CT computation as a single connected exercise, rather than two separate tasks handed to different people at different times, catches inconsistencies between the two before either one is finalised. Capital allowances claims, in particular, need to reconcile against the fixed asset register from step four, not be recalculated independently.Â
10. Review, sign off, and file
A single named reviewer should check the finished accounts against the trial balance, the CT600 against the accounts, and the confirmation statement against the verified director and PSC list from step two, before anything goes anywhere. Filing all three in a coordinated sequence, rather than treating them as unrelated deadlines, is what actually prevents the kind of late filing penalty Companies House issued 303,000-plus times last year.Â
Where outsourced support fits into this process?
Several of the steps above, reconciliations, fixed asset schedules, accruals and prepayments, are exactly the kind of structured, repeatable work that suits outsourced accounts preparation. Â
Firms using this model well tend to hand off the mechanical reconciliation and schedule-building steps while keeping the standard-setting judgment calls, the final review, and the client conversation firmly in-house. This split is what separates a genuine accounting firm year-end checklist that scales across a full client book from one that only works for a handful of straightforward files.Â
Closing thoughts
Most year-end failures trace back to a step that got skipped under time pressure, not a step nobody knew about. The identity verification requirement landing this November is the clearest example this year of a compliance change that’s easy to miss if the checklist hasn’t been updated to include it.Â
Datamatics Business Solutions has spent over five decades supporting accounts preparation services UK firms rely on for exactly this kind of structured, repeatable year-end work, backed by ISO 27001:2022 and GDPR-ready data handling across every engagement. Want a second set of eyes on where your own year-end process might have gaps? Let’s talk.Â
What happens if statutory accounts are filed late?
Companies House applies an automatic penalty starting at £150 for up to one month late, rising to £1,500 for over six months late, doubling if late in two consecutive years.
What is the new identity verification requirement for year-end 2026?
Under ECCTA, all existing directors, LLP members and PSCs must verify their identity with Companies House by 17 November 2026, or risk delays to related filings.
Should corporation tax computations be prepared separately from the accounts?
No. Preparing both together catches inconsistencies, particularly around capital allowances and fixed asset movements, before either document is finalised.
Which accounting standard applies to a small UK company’s year-end account?
Most small companies use FRS 102, while eligible micro-entities can use the simpler FRS 105. Confirm current-year amendments before assuming last year’s approach still applies.
Can year-end accounts preparation be safely outsourced?
Structured, repeatable tasks like reconciliations and fixed asset schedules suit outsourcing well, provided final review, technical judgment, and sign-off stay with the firm’s own qualified staff.
