The worst time to think about how to do limited company accounts is usually the night before the filing deadline, with a folder of bank statements, a half-finished spreadsheet and one uncomfortable feeling that something important has been missed. Most directors don't fail because they're careless, they fail because they've treated three connected jobs like one vague annual chore.
A proper year-end for a UK limited company has to produce three outputs that agree. There are the Companies House statutory accounts, the corporation tax computation, and the HMRC CT600 return. If those three don't reconcile, you don't just have a bookkeeping problem, you have a compliance problem.
What Limited Company Accounts Involve
The cleanest way to think about limited company accounts is this. They are not one document, they are the final stage of a year-round evidence trail. GOV.UK says limited company accounts are built around a balance sheet, a profit and loss account, notes to the accounts, and, unless the company is a micro-entity, a directors' report. The accounts have to be prepared from records that show income, expenses, assets, liabilities and amounts owed to or by the business, which is why this is as much about records discipline as it is about reporting GOV.UK annual accounts guidance.
The three outputs that have to match
The statutory accounts tell Companies House what happened in the year. The corporation tax computation translates the same underlying numbers into the tax position. The CT600 is the return HMRC expects to see filed on top of that. If one says the company made a profit and another points to a different figure, the mismatch needs explaining.
That is why the year-end date matters so much. A clean year-end lets the statutory accounts, the tax computation and the CT600 sit on the same timeline. A messy one creates avoidable work later, especially when directors have moved expenses, dividends and loan account entries around without a proper monthly close.
GOV.UK's filing timetable matters here. For new companies, the first accounts are generally due 21 months after incorporation, and later accounts are due 9 months after the end of the accounting period GOV.UK annual accounts guidance. That means the clock starts at incorporation, not when the director finally decides to sort the accounts out.
The records you need before year-end
The weakest point in most owner-managed companies is the evidence trail. Before you reach year-end, directors should be keeping bank statements, sales invoices, purchase invoices, expense receipts, payroll records, and any loan or director's loan account agreements. GOV.UK is explicit that accounting records have to be good enough to show and explain all company transactions GOV.UK company and accounting records.
A monthly close is what stops this becoming a firefight. In cloud software such as Xero, the routine should be to reconcile the bank, clear uncategorised items, check supplier balances, post payroll entries, and review the director's loan account before the month drifts away. Missed invoices are much easier to spot in week one than in month twelve.
Practical rule: if a transaction can't be matched to a source document, treat it as unfinished, not as “probably fine”.
For a service company, the recurring evidence trail should also include petty cash records if you still use cash, VAT workings if you're VAT registered, and any shareholder loan paperwork. Stewart Accounting Services' limited company compliance guide is a useful companion if you want a fuller view of the compliance side alongside the accounts work.
HR management financial data also becomes more relevant here than many directors expect, because payroll, pensions and staff-related reporting sit alongside the core accounting records. The HR management financial data resource is helpful if you want to see how reporting connects across functions.
A simple monthly close checklist
Run this on the first working day after each month end.
- Reconcile the bank: Match every statement line to a receipt, invoice or payment.
- Chase missing paperwork: Ask for expense receipts, supplier invoices and payroll reports that have not landed.
- Review the director's loan account: Check withdrawals, repayments and benefits in kind treatment.
- Clear petty cash: Keep a running log, not a shoebox.
- Check VAT coding: Make sure sales, purchases and reverse entries have landed correctly.
- Look at aged debtor and creditor balances: Anything odd here becomes a year-end explanation later.
- Save payroll reports: Keep the records that support salaries, PAYE and pension entries.
- Flag unusual items early: Director loans, asset purchases and one-off costs are easier to fix now than later.
Year-End Adjustments in the Right Order
A year-end file goes wrong when the adjustments are tackled in the wrong sequence. I start with timing items, then move to fixed assets, then stock or debtor recoverability, and only after that do I settle the director's loan position. If those steps are reversed, earlier journals often need to be rewritten after the accounts already look finished.
Start with timing items, not tax
Accruals and prepayments come first because they set the profit for the period. If an invoice relates to services received before the year-end but turns up later, it needs to be accrued. If money has been paid in advance, the unused element belongs in prepayments. That keeps the profit and loss account tied to the period the cost relates to, not the payment date.
For a small services company with a 31 March year-end, the entries are usually straightforward. A subcontractor invoice for March that arrives in April gets accrued into March. A software subscription paid in February for twelve months is only partly charged to the year just ended, because some of that cost falls into the next period.
The useful year-end question is not “Has the invoice arrived?”. It is “Which period benefited from the cost?”
A clean month-end close makes this much easier, and a short pre-tax checklist from year-end planning before tax deadlines helps directors spot the timing items before they become file clean-up work.
Then deal with fixed assets and recoverability
Depreciation comes next. A laptop, a van or office equipment does not run through the profit and loss account in one hit just because the cash has left the bank. The charge should follow the useful life policy used in the accounts.
After that, check stock if the company holds goods, then review bad debt provisions. If a customer balance looks doubtful, do not leave it sitting there on hope alone. A realistic provision is better than a balance sheet that assumes every debtor will pay in full.
The final step is the director's loan account. Small companies often leave this too late. If the director has withdrawn more than they have repaid, the balance needs a proper reconciliation, including any tax consequences such as Section 455 where relevant. STZ Accounting's pre-tax year-end planning guide is useful on the control side, especially where the records are incomplete.
A short worked example
Take a consulting company with a March year-end.
- Accrual: March subcontract work is invoiced in April, so the cost is recorded in March.
- Prepayment: An annual software licence paid in February is spread across the months it covers.
- Depreciation: Office equipment is charged through the accounts rather than expensed only on purchase.
- Bad debt: A long-overdue customer balance is provided against if recovery looks weak.
- Director's loan: The balance is checked against drawings, salary and repayments before the tax return is finalised.
The failure mode is usually the same, missing source records. Missing invoices, missing receipts and missing loan agreements distort turnover, liabilities and director loan treatment, and those errors are harder to unwind at year-end than during monthly bookkeeping. The STZ Accounting guide covers this control point well.
If you want one practical request to make in February or March, ask for a draft balance sheet plus a list of accruals, prepayments, fixed assets, debtor risks and the director's loan position. That gives you the shape of the accounts before filing pressure starts.
Reading the Profit and Loss Like a Decision Maker
A profit and loss account is a working map of the trade, not a form to file and forget. The lines appear in a set order because each one answers a different question about how the company is performing, and that order helps you see whether the business is making money from real trading or just staying busy. If you want a broader finance view, the founder's guide to income statements is a useful companion, but the UK statutory logic stays the same.
Turnover to gross profit to net profit
Turnover sits at the top. It is the sales figure before anything is taken out. From there, cost of sales is deducted to give gross profit, and gross profit as a percentage of turnover is the gross profit margin. After overheads, interest and corporation tax, what remains is net profit, the figure most directors look at first.
Gross margin is usually the first number worth testing. It strips out overhead noise and shows whether the core trading work is healthy. If margin is weak, pushing for more sales often just creates more low-quality work.
| Profit and Loss Walk-Through Example | ||
|---|---|---|
| Line | Example figure | What it means |
| Turnover | £100,000 | Sales before any costs are deducted |
| Cost of sales | £40,000 | Direct costs tied to delivering the work |
| Gross profit | £60,000 | What remains before overheads |
| Overheads | £35,000 | Rent, admin, software, motor, other running costs |
| Operating profit | £25,000 | Trading result before finance and tax |
| Interest and tax | £5,000 | Financing and corporation tax items |
| Net profit | £20,000 | Final profit available in the accounts |
What backs each line
Sales invoices support turnover. Purchase invoices and job costs support cost of sales. Payroll records support staff costs. If those records are weak, the profit and loss account turns into guesswork.
That is why I ask owners to review their management accounts before year-end and mark the lines they trust. If sales are clean but cost allocation is messy, sort that first. If director expenses are still spread across several nominal codes, tidy them before the statutory accounts are prepared. The same discipline applies to the source records that sit behind the figures, as set out in GOV.UK company and accounting records.
Which reporting regime applies
Classification matters because the filing burden changes depending on whether the company is a micro-entity, small company or something larger. GOV.UK distinguishes those routes, and the wrong classification creates avoidable filing issues. Even when the filing is abridged, the underlying balance sheet, profit and loss account and notes still have to be prepared and retained.
The practical difference is not whether work exists, it is how much of that work is visible at Companies House. Micro-entity filings are leaner. Small company filings are still simplified. Full accounts carry more disclosure and, where applicable, more formal reporting. The company's records still have to support the numbers either way.
For a director, the point is straightforward. Know which regime you are in before the accountant starts finalising the file. If the company has drifted in size or complexity, check the classification first rather than guessing after the accounts are drafted.
Aligning Year-End, Corporation Tax and the CT600
A lot of first-time directors treat the statutory accounts, corporation tax computation and CT600 as three separate jobs. In practice, they are one year-end exercise with three outputs. If the timeline slips between them, you can end up with a tax return that does not tie to the accounts, or a filing period that needs correcting before anyone is ready to sign it off.
The 31 March example
Take a company with a 31 March year-end. The Companies House accounts are generally due 9 months after the end of the accounting period, so they're due by 31 December GOV.UK annual accounts guidance. Corporation tax is typically payable 9 months and 1 day after the end of the accounting period, so in this example that date is 1 January GOV.UK annual accounts guidance. The CT600 itself is due 12 months after the accounting period ends GOV.UK annual accounts guidance.
That timetable only works if the numbers are already aligned. The corporation tax computation has to reconcile back to the statutory accounts, line by line where it matters. If profit before tax in the accounts does not bridge cleanly to taxable profit, HMRC has a clear reason to ask questions, and the return becomes harder to defend.
When to lock the numbers
The file should stop moving once the year-end journals, fixed asset schedule and director loan account are agreed and the draft accounts match the tax computation. After that point, late invoices and fresh journals usually create more work than value. The practical trade-off is simple, every extra change pushes the signing and filing process further away.
Corporation tax periods also have a hard stop, so the accounting period for tax cannot run longer than 12 months STZ Accounting practical guide. That is one reason the year-end choice matters more than many owners expect. A date that looks convenient for bookkeeping can still create awkward splits if the business is not ready for it.
Practical rule: once the statutory accounts, tax computation and CT600 all agree, stop tinkering unless a new document changes the answer.
A better way to manage the year is to run one calendar backwards from the filing dates. Finalise the bookkeeping first, then agree the adjustments, then approve the accounts, then file the CT600 and pay the tax. Owners who use that order avoid the usual last-minute scramble, and a simple cloud accounting workflow for small businesses makes that sequence easier to keep on track. If the bookkeeping setup is connected properly, the same figures can feed the accounts, the tax computation and the return without rekeying. That is also where step-by-step accounting automation helps, because it reduces the manual handoffs that usually slow year-end down.
How Companies House Reforms Are Changing the Job
A limited company year-end used to feel like a paperwork exercise. That is no longer the full picture. Under the current Companies House reform direction linked to the Economic Crime and Corporate Transparency agenda, accounts submission is moving toward a stronger data-quality and governance task, with identity checks and tighter filing discipline now part of the normal workflow GOV.UK company filing reforms.
What changes in practice
For directors, the sensible response is housekeeping. Check that the registered office is correct, SIC codes make sense, and the accounting software can produce digital files that suit the route you use. If your process still depends on printing, signing, scanning and rekeying, it already sits behind the direction of travel.
The wider shift is simple. The company has to show it is being run properly, not just send in a set of figures once a year. Good records, consistent bookkeeping and clear officer information carry more weight than they used to.
Choosing the right reporting route
The three main routes still matter because they affect disclosure. A micro-entity file is the leanest. A small company file gives a little more detail. Full accounts disclose more again. The wrong route can create compliance errors because the legal skeleton stays the same even when the filing package is shorter. The balance sheet, profit and loss account and notes do not disappear just because the presentation is compressed GOV.UK annual accounts guidance.
Cloud software and a proper accounting workflow help here. The system should produce consistent records, not just store receipts. If it cannot, the rework lands at year-end.
Owners who want a process that fits these changes often need support with cloud setup as much as with the numbers themselves. Stewart Accounting Services' cloud accounting for small business is one example of how the software side can be organised around compliance rather than patched together afterwards.
When Cloud Accounting Plus an Accountant Beats Going It Alone
A cloud platform is good at process. An accountant is good at judgement. Put them together and the year-end becomes manageable. Separate them, and you usually end up with either tidy books and weak tax planning, or decent instincts and messy records.
What software does well
Xero is strong on bank feeds, automated categorisation, multi-user access and VAT return preparation. It reduces the amount of manual data entry and makes month-end closer to a live process than a post-mortem. For an owner who wants visibility during the year, that matters more than the layout of the year-end file.
If you want to see how integrations can be built properly, Recurrr's step-by-step accounting automation guide is a useful reference point for thinking about the workflow rather than just the software name.
What the accountant adds
A Chartered Accountant adds the calls that software can't make cleanly. Accruals and prepayments need judgment. Director remuneration has to be structured with tax in mind. Corporation tax planning should be done before the year closes, not after the HMRC login has been opened. And the final filing has to be right, because the statutory accounts, the corporation tax computation and the CT600 all have to agree.
That's where the hybrid model often beats DIY. A director with a simple, low-transaction company can sometimes manage the basics alone, especially if the bank feed is clean and the records are disciplined. Once the company has payroll, stock, loans, multiple income lines or messy director drawings, the time cost of DIY rises quickly.
The real decision is about owner hours
Most directors think they're choosing between software cost and accountant cost. In practice, they're choosing between time spent on accounts and time spent on the business. If you're losing evenings chasing receipts, reclassifying transactions and worrying about filing mistakes, the spreadsheet isn't free.
That's also where a firm like Stewart Accounting Services fits naturally. The value isn't in pushing every client onto the same package, it's in matching bookkeeping, year-end accounts, tax returns and cloud workflows to the size and complexity of the company.
A 90-Day Timeline and Quick Wins to Take Away
A 31 March year-end gives you a workable rhythm if you stop treating year-end as a single event. The first 90 days after year-end are where most of the heavy lifting happens, and that's the period to control tightly. Use the timetable below as the default, then adjust it only if your industry or record quality requires it.
A practical timeline
- First week of April: Close the books, reconcile the bank, and freeze routine postings for the prior year.
- By mid-April: Gather missing invoices, expense claims, payroll reports and loan paperwork.
- By mid-May: Agree year-end adjustments with your accountant, including accruals, prepayments, depreciation and loan account balances.
- By end of June: Approve the statutory accounts and make sure the CT computation reconciles.
- By 1 January: Pay corporation tax for the 31 March year-end.
- By 31 March: File the CT600.
That schedule keeps the year-end moving instead of letting it sit in a draft folder for months. It also gives you time to fix anything awkward before the filing deadline turns it into a deadline problem.
The eight things directors forget most often
- Missing purchase invoices: These distort cost of sales and overheads.
- Unreconciled bank items: These hide duplicate, stale or misposted transactions.
- Director's loan balances: These often need a proper tax review.
- Prepayments: Annual subscriptions and insurance are often overstated in the current year.
- Accruals: Costs incurred before year-end but invoiced later are easy to miss.
- Fixed asset additions: New equipment needs the correct treatment, not a quick expense.
- Payroll journals: Salaries, PAYE and pension records have to tie back.
- Wrong filing classification: Micro-entity, small company and full accounts are not interchangeable.
The shift is simple. Stop doing accounts as an annual rescue job, and start doing them as a monthly control routine.
If your current process doesn't let you close the books cleanly each month, fix that first. Then bring in cloud accounting, a proper year-end review and a filing process that lines up Companies House, HMRC and your own records. If you want help putting that into a workable routine, contact Stewart Accounting Services and ask for support with bookkeeping, statutory accounts and corporation tax planning before the next year-end starts creeping up on you.