Your business has grown. You’ve got more customers, more money moving around, more people to pay, and more decisions landing on your desk.
And somewhere along the way, the financial side of the business has become a lot more complicated than sending invoices, paying bills, and getting the year-end accounts done.
That’s normal. As a business grows, its finance function needs to grow with it.
The goal isn’t to build a huge internal finance department for the sake of it. It’s to make sure you have the right financial systems, information, and expertise around you for the stage you’re at and the stage you’re heading towards.
So, what should a finance function for a growing business look like?
What Does a Finance Function Do?
Your finance function is everything that keeps the financial side of your business running and helps you use the numbers to make better decisions.
Depending on the size and complexity of your business, that can include:
Bookkeeping
Accounts
VAT and payroll
Payments and credit control
Management reporting
Budgets and forecasts
Cash planning
Financial modelling
Tax planning
Funding support
Strategic financial advice
Some of these activities keep the engine running day to day. Others help you understand performance, plan ahead, and decide where the business goes next.
A good finance function gives you the information, systems, and expertise you need to run the business you have today and prepare for the one you’re building.
Stage 1: Get the Financial Foundations Working Properly
Every strong finance function starts with reliable foundations.
That means accurate bookkeeping, accounts, VAT, payroll, and financial records that are up to date and easy to access.
It also means having the right technology in place. Cloud accounting systems like Xero, automation, and connected tools can remove a huge amount of repetitive admin while creating cleaner, more useful financial data.
At this stage, the biggest wins are often fairly simple: fewer manual processes, less time spent chasing information, and more confidence that the numbers you’re looking at are accurate.
That matters because everything else in your finance function depends on it.
You can’t build useful forecasts, management reports or financial strategy on unreliable data.
Get the foundations right and you create a finance setup that saves time, reduces stress, and gives you more space to focus on what you love.
Stage 2: Add Visibility and Financial Control
As a business grows, the questions start to change.
It’s no longer enough to know that the bookkeeping is up to date. You need to understand how the business is performing.
Are you hitting your targets?
Why has margin changed?
What does cash look like over the next few months?
Which parts of the business are performing best?
This is where Financial Controller-level support starts to add real value.
Your finance function might now include:
Budgets and forecasts
Regular cash reviews
Payment management
Financial communications
Credit control
The aim is to build a regular financial rhythm around the business.
Instead of waiting months to understand what happened, you can review performance consistently, spot changes earlier, and make decisions while there’s still time to influence the outcome.
This is the point where your financial information starts becoming a management tool.
Stage 3: Bring Financial Thinking Into Bigger Decisions
Growth creates bigger decisions.
Should you make that next hire?
Can you afford to invest?
Should you enter a new market?
How much runway do you have?
What happens if growth is slower than expected?
At this stage, your finance function needs to support the thinking behind those decisions.
That’s where CFO-level input can become valuable.
This might include:
Strategic planning
Board sessions
Financial modelling
Runway monitoring
Scenario planning
Consultancy support
Financial modelling allows you to explore a decision before you commit to it. You can see how a hire, investment, or change in strategy could affect cash, profitability, and the wider business.
As the decisions get bigger, the value of having experienced financial thinking around the table increases too.
And that doesn’t necessarily mean employing a full-time CFO.
Growing businesses can access fractional CFO support at the level and frequency they need, giving them strategic financial expertise without immediately building an entire internal department.
Stage 4: Bring in Specialist Expertise When You Need It
Growth rarely happens in a perfectly straight line.
There will be moments when your business needs expertise that isn’t part of the everyday finance routine.
You might be raising investment, introducing an employee share scheme, exploring tax reliefs, preparing for due diligence, or managing a cap table.
Your finance function may need access to specialist support such as:
Investor communications
Investor due diligence
Cap table management
R&D tax credits
Tax planning
SEIS and EIS
Employee share schemes
The key is flexibility.
You may not need this expertise every week, but when an important opportunity or project comes along, you want the right people available to help you navigate it properly.
Your finance function should be able to flex when the business hits an important moment.
Do You Need to Hire a Full Finance Team?
Not necessarily. One of the biggest advantages of a fractional finance function is that you can access different levels of support as your needs change.
Your business might need:
Ongoing accounting and compliance
Financial Controller support every month
CFO input around strategic decisions
Specialist expertise for a particular project
That support can evolve without you having to hire several full-time finance roles before the business is ready for them.
At Complete HQ, our Fractional FinOps approach is built around exactly that idea: giving ambitious businesses access to the right level of financial expertise at the right time.
The aim isn’t to give you more finance than you need. It’s to give you the right finance support for where you are and where you’re going.
How Do You Know What Level of Finance Support You Need?
Turn the question around and look at the gaps in your current setup.
Ask yourself:
Are our books accurate and up to date?
Can we clearly see cash, profit, and performance?
Do we have a useful budget and forecast?
Can we model the financial impact of major decisions?
Do we know whether we’re on track against our goals?
Is someone proactively helping us understand what the numbers mean?
Can we access specialist financial expertise when we need it?
Your turnover alone doesn’t determine what support you need.
A £500k business with a simple model may need something very different from a £500k business managing rapid growth, investment, multiple revenue streams, and a growing team.
Complexity, ambition, and the decisions you’re making matter too.
Build a Finance Function That Grows With You
Your finance function should make your business easier to run.
It should help you understand what’s happening, plan what comes next, and make decisions with more confidence.
As the business grows, that might mean adding deeper reporting, better forecasting, Financial Controller support, CFO-level strategy, or specialist expertise.
And when those pieces are working together, the financial side of the business becomes a powerful part of how you grow.
At Complete HQ, we build flexible, tech-driven finance support around the needs of ambitious businesses, from day-to-day accounting through to Financial Controller, CFO, and specialist support.
Book a free discovery call and let’s work out what your finance function needs next.
