Startup Bookkeeping Checklist for UK Founders (2026)
Good startup bookkeeping comes down to three habits. Keep business money separate from your own. Record and reconcile every transaction each month. Know your filing dates before they arrive. The checklist below is split into day-one setup, monthly tasks, quarterly checks and year-end, written for UK limited companies.
TL;DR
Open a business bank account and pick cloud accounting software before your first invoice.
Every month: reconcile the bank, match receipts, chase unpaid invoices and review cash flow.
Watch the £90,000 VAT threshold on a rolling 12-month basis, not by tax year.
Keep records for at least 6 years, and longer if HMRC has an open check.
Annual accounts are due at Companies House within 9 months of year-end, and a confirmation statement at least every 12 months.
Table of Contents
Why a checklist matters before you have revenue
Bookkeeping is a legal duty, not an admin preference. Under the Companies Act 2006, every company must keep adequate accounting records. GOV.UK says failing to keep them can mean a £3,000 fine or director disqualification.
There is a practical reason too. Messy books in month three become an expensive clean-up in month eighteen, just when an investor, lender or HMRC asks a question. If you are still pre-revenue, our founder’s guide to accounting for pre-revenue startups covers what to record before the first sale.
Day-one setup checklist
Do these once, early.
Open a separate business bank account. GOV.UK is clear that there must be a clear division between the company’s finances and those of its owners and directors. Never pay company costs from a personal card, and if you must, log it as a director’s loan.
Choose cloud accounting software and connect the bank feed. Check that it can handle VAT and, later, HMRC submissions. Our guide to an HMRC-ready accounting software setup lists the mistakes to avoid.
Build a simple chart of accounts. Fewer categories beat many. Revenue, cost of sales, software, payroll, professional fees, travel, marketing and director’s loan are enough to start.
Set your accounting reference date. This fixes your year-end and the deadline for your accounts.
Decide on invoicing rules. Use numbered invoices, state payment terms, and agree who approves purchases.
Create a document system. One folder or app for receipts, contracts, payslips and bank statements, named consistently.
Plan for foreign currency if you sell or buy abroad. See multi-currency bookkeeping for startups before the first dollar or euro invoice.
Monthly bookkeeping checklist
Set a fixed slot, ideally in the first week of the month. Forty-five minutes is usually enough for a young company.
Reconcile every bank, credit card and payment-processor account to its statement.
Categorise new transactions and clear anything left in a suspense or uncategorised account.
Match receipts and invoices to payments. A transaction with no document is a problem waiting for an enquiry.
Issue outstanding invoices and chase those overdue.
Record director’s loan movements and expense claims.
Run payroll if you pay anyone, including yourself through PAYE.
Check a profit and loss report and a cash position against your forecast.
Back up or export key reports.
A written routine helps whatever the industry. This seven-day compliance onboarding checklist from an equine software firm shows how a dated, step-by-step list keeps record-keeping tasks from slipping, and the same idea works for your own bookkeeping calendar.
If you employ people
Employers must send a Full Payment Submission to HMRC on or before each payday. HMRC’s manual says late filing penalties start at £100 for schemes with 1 to 9 employees, applied monthly but issued quarterly. The same page notes that if you paid nobody in a tax month, you send an Employer Payment Summary by the 19th after that month.
Quarterly checks
Once a quarter, step back from the transactions.
VAT: if you are registered, most businesses send a VAT return every 3 months. Reconcile the VAT control account before you submit.
VAT threshold: each month, add up the last 12 months of taxable sales. Once the total passes £90,000, you must register within 30 days of the end of that month. Our explainer on the £90,000 threshold and backdated VAT shows how the rolling test catches fast-growing startups, and the step-by-step VAT registration guide covers the process.
Cash runway: update your forecast with actuals and recalculate how many months you have left.
Debtors and creditors: review ageing reports and agree a plan for anything over 60 days.
Tax provision: set money aside for corporation tax. Our guide to corporation tax payment deadlines explains when payment falls due.
Sole traders and landlords are in a different position. HMRC says those earning over £50,000 have had to keep digital records and send quarterly updates since April 2026. If you trade outside a company, check where you stand.
Year-end and annual filing checklist
Task | Deadline or rule | Source |
Annual accounts to Companies House | Within 9 months of the end of the financial year | |
Confirmation statement | At least every 12 months, £50 fee | |
Late accounts | Automatic penalties apply | |
Record retention | At least 6 years for tax purposes |
Before year-end, work through this list:
Reconcile every account to the last day of the period.
Take a stock count if you hold inventory, and list fixed assets bought in the year.
Accrue costs you have received but not paid, and defer income you have invoiced but not yet earned.
Confirm payroll, pension and VAT balances agree with filed returns.
Gather loan statements, director’s loan balances and shareholder details.
When the books are tidy, preparing statutory accounts is far quicker. Our statutory accounts preparation guide explains what is included. A dormant company still has duties, covered in our dormant company accounts guide.
How long to keep your records
The Companies Act sets a minimum, but tax rules usually run longer. HMRC’s compliance handbook says companies must keep records until the latest of several dates, including the sixth anniversary of the end of the accounting period. Records also need to be kept while an HMRC check into that return remains open, so do not delete files on a fixed date without checking for open enquiries.
For the types of record sole traders and partners must hold, see HMRC’s general guide to keeping records.
Our view: when to stop doing it yourself
We work with founders and growing businesses every week, and the pattern is consistent. Software handles the day-to-day well. What it cannot do is judge. It will not tell you that a transaction is a capital item, that a grant has a tax treatment, or that your VAT registration date has already passed.
Our advice is to do the monthly routine yourself while the business is small and transactions are few. Bring in a professional at three moments: when you register for VAT or start payroll, when you take investment, and when statutory accounts first need to give a true and fair view. That is far cheaper than repairing a year of miscoded data.
The aim is not to hand over the books. It is to have someone experienced reading them alongside you, so the numbers help you make decisions rather than just satisfy a deadline.
— Shoaib
Getting help with the checklist
If you would rather not carry this list yourself, we offer flexible accounting services at 99-199 GBP per month, covering bookkeeping, VAT filing, payroll, tax planning, accounts preparation and Companies House compliance, supported by modern digital software and an experienced team. Services scale as your business grows.
FAQ
How often should a startup do its bookkeeping?
Monthly is the minimum for most startups, with bank reconciliation and receipt matching done in the same sitting. Businesses with high transaction volumes, or those that invoice weekly, often do light weekly checks too. Waiting until year-end is how errors and missing receipts pile up.
Do I need an accountant or can I use software alone?
Software is enough for recording transactions in a very simple company. You will usually want professional input once you register for VAT, run payroll, raise investment or need statutory accounts. An accountant also helps with tax planning, which software does not do for you.
What records must a UK limited company keep?
You must keep records that explain every transaction and show the company’s financial position, as section 386 of the Companies Act 2006 requires. In practice that means sales and purchase invoices, bank statements, payroll records and VAT records if registered. Keep them for at least 6 years.
When must I register for VAT?
When your taxable turnover over any rolling 12-month period goes above £90,000, you must register within 30 days of the end of that month. You can also register voluntarily below that level if it suits your business.
Sources
Recommended