Startup Accounting in the UK: What to Set Up and When
Startup accounting is the work of recording, organising and reporting your company’s money so you stay compliant and can make decisions with real numbers. For a UK limited company that means separate business banking, tidy records from day one, a monthly look at cash, and an accountant once your tax, VAT or payroll obligations start to stack up. This guide covers each step in the order a founder meets them.
TL;DR
Open a business bank account and keep every transaction, invoice and receipt from the first day. Limited companies must keep records for at least 6 years.
Bookkeeping is the day-to-day record. Statutory accounts are the annual filing. Management accounts are the monthly view you use to steer.
Track cash, burn rate and runway monthly, not just at year end.
You are not legally required to hire an accountant, but the earlier you get one, the fewer expensive clean-ups you face.
Retainers for small businesses commonly run from £75 to £300 a month.
Table of Contents
What startup accounting actually covers
It is easy to read “accounting” as the annual tax return. In practice it is a set of connected jobs: bookkeeping, cash flow management, tax compliance, budgeting and financial reporting. Early on, most of the value sits in the first one. If the daily record is right, everything built on it (tax, reporting, investor updates) is quick and cheap. If it is wrong, every later job inherits the mess.
The same applies before you have revenue. If you are still pre-launch, our guide to accounting for pre-revenue startups covers what to record when nothing is coming in yet.
The records to keep from day one
The law sets a floor. UK limited companies must keep accounting records showing money received and spent, assets, debts owed to or by the company, and stock held at the financial year end. You must hold them for at least 6 years from the end of the financial year they relate to.
In practical terms, keep:
Sales invoices and purchase invoices or receipts
Bank statements and card statements
Payroll records, including director and employee payments
Tax filings and correspondence with HMRC and Companies House
Signed contracts, loan agreements and investor paperwork
That list follows the types of record startups are advised to hold. The stakes are real: failing to keep proper records can bring a £3,000 HMRC fine or director disqualification.
Bookkeeping, statutory accounts and management accounts
Founders often use these terms interchangeably. They are three different things.
Bookkeeping | Statutory accounts | Management accounts | |
Purpose | Record every transaction as it happens | Annual accounts filed to meet legal requirements | Internal view of performance |
Frequency | Daily to weekly | Once a year | Monthly or quarterly |
Audience | You and your accountant | Companies House and HMRC | You, your board, investors |
Format | Ledgers and bank feeds | Prescribed statements | Flexible: P&L, cash, KPIs |
Bookkeeping feeds both of the others. A limited company needs to file annual statutory accounts, pay Corporation Tax, submit a Company Tax Return and file a Confirmation Statement. Directors also complete Self Assessment if they receive dividends or untaxed salary. Management accounts are not a legal requirement, but they are what lenders and investors ask to see. If you expect to raise money, our piece on three-way forecasting explains what UK lenders expect.
Do not leave filing to chance either. Late Companies House filing carries penalties, which we break down in how to limit late filing penalties. If your year end does not suit your business, you can look at changing your accounting reference date.
Setting up bookkeeping properly
Separate the money. A limited company is its own legal entity, and business banking must be kept apart from personal accounts.
Choose cloud software that connects to your bank feed, so transactions arrive without retyping.
Set a routine. Categorise transactions and attach receipts weekly, not in a panic before a deadline.
Decide your currency policy early. If you sell or buy abroad, read our advice on multi-currency bookkeeping for startups before the first foreign invoice.
Agree who does what. Founders should know which tasks they own and which go to a bookkeeper or accountant.
If you are VAT registered or heading towards it, bear in mind that Making Tax Digital is a government programme requiring eligible businesses to use specific software to log income and expenses and submit returns. Compatible cloud software from the start avoids a later migration.
Using your numbers to run the business
Good accounts are for decisions, not just filing. A sensible monthly review compares forecast profit and loss with actual results and checks the bank balance. Beyond that, startups are advised to track burn rate, runway, gross margin and monthly recurring revenue where they apply.
A simple example: if you spend £20,000 a month more than you earn and hold £120,000 in the bank, your runway is six months. That single figure should shape when you start fundraising. Forecasting is the natural next step, and our guide to operational cash flow forecasting shows how to spot shortfalls before they arrive. If margins are tightening, this 2026 playbook on shrinking margins is a good place to look next.
When the conversation turns to investors, your accounts also underpin what the company is worth. A walkthrough on valuing a startup before Series A shows how clean financials feed into that discussion.
When to hire an accountant and what it costs
There is no legal duty to hire one. Still, an accountant can save time, support compliance and help with strategic decisions. The official view is similar: hiring one can save time and surface tax-efficiency opportunities, though tax remains the director’s responsibility.
Good triggers to bring one in:
Before you incorporate, so the structure and share setup are right
When you hire your first employee or start running payroll
When you approach the VAT threshold
When you plan to raise investment or apply for a loan
When growth makes your finances more complex and you need someone who can model scenarios and advise on investment
On cost, small business accountants typically charge £75 to £300 a month on retainer, or £50 to £200 an hour. Your options run from doing it yourself, to outsourced bookkeeping, to a specialist startup accountant, supported by cloud software. The right mix depends on your stage and complexity.
Our perspective
Most startup accounting problems we see are not tax problems. They are timing problems. A founder leaves the books for a year, then discovers the VAT position, the director’s loan and the cash forecast are all unclear at once. Our approach is to pair modern digital tools with traditional accounting judgement. The software keeps the books current and efficient. A person with real experience, including time at top firms in the UK and the Middle East, reads them and tells you what they mean. That is why we build support around the stage you are at: bookkeeping and compliance first, then proactive tax planning, then forecasting and specialist advice as the business grows. You get one team that knows your company, not a different name each quarter. Shoaib
How we can help
Keystone Financial Advisory supports founders, startups and growing businesses with company set-up and confirmation statements, day-to-day bookkeeping, VAT filing, tax planning and returns, payroll, accounts preparation and year-end reporting, and audit readiness checks. Our flexible accounting packages are priced at £99 to £199 per month, and they scale as you grow.
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If you would like a team that keeps your records current and talks to you about the numbers, see our accounting services for startups.
FAQ
What is the difference between bookkeeping and accounting for a startup?
Bookkeeping is the daily recording of transactions. Accounting uses that record to produce statutory accounts, tax filings and management reports, and to advise you. You need accurate bookkeeping before the rest can work.
When should a startup get an accountant?
Ideally before or at incorporation, and certainly by the time you hire staff, approach the VAT threshold or plan to raise money. It is not a legal requirement, but early advice usually costs less than fixing mistakes later.
How long must a UK startup keep its financial records?
Limited companies must keep accounting records for at least 6 years from the end of the financial year they relate to. Keep digital copies of invoices, bank statements and contracts so they are easy to produce.
How much does a startup accountant cost?
Typical small business retainers fall between £75 and £300 a month, depending on scope. Our flexible packages are £99 to £199 per month.
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