How to create a startup budget and cash flow forecast

Time to talk numbers!

Don’t worry, you don’t need to be a maths whizz for this. Creating a budget and a cash flow forecast is simply about making a realistic plan for your money. It’s one of the most powerful things you can do to give your business a strong start.

Think of it like planning a big road trip. Your startup budget is the cost of the car, the snacks, and the map. Your cash flow forecast is the plan for how much petrol you’ll need for each leg of the journey and where you'll fill up.

Part 1: Your Startup Budget – The One-Off Costs

First, let's figure out how much it will cost just to get the doors open. These are the costs you’ll only pay once at the very beginning. Grab a notepad or open a spreadsheet and list everything you need to buy or set up before you can make your first sale.

Common startup costs include:

• Legal and Admin Fees: Costs for registering your company or getting advice.
• Equipment: A laptop, a specific tool, a card reader, or a camera.
• Website & Domain: The cost of building your website and buying your domain name.
• Branding: A logo design or creating initial marketing materials.
• Initial Stock: The first batch of products you need to buy to sell.
• Deposits: A security deposit for a rental space or workshop.
• Insurance & Licences: The upfront cost for your business insurance or any required permits.

Once you have your list, research the likely cost of each item and add it all up. This final number is your Total Startup Cost.

Top Tip: It’s always wise to add a little extra on top – a ‘contingency fund’ of about 10-15% of your total. This covers any unexpected costs you didn’t see coming.

Part 2: Your Cash Flow Forecast – The Monthly Ins and Outs

Now that you know what it costs to start, you need to predict what it will cost to keep the business running each month. A cash flow forecast estimates the money coming in and going out of your business over a set period, usually your first 12 months.

Step 1: Forecast Your Monthly Income (Cash In)

This is often the trickiest part. You need to estimate how much you’ll sell each month. Be honest and conservative here – it’s better to be pleasantly surprised than to run out of money!

Think about:

• How many products will you realistically sell in Month 1? Month 2?
• How many clients can you serve?
• Will your sales be seasonal? For example, an ice cream seller will be busier in summer.

Write down your estimated sales income for each of the first 12 months.

Step 2: Forecast Your Monthly Expenses (Cash Out)

These are your regular, repeating costs. They are often called ‘overheads’. Go through your business plan and list everything you’ll have to pay for each month.

Common monthly expenses include:

• Rent or Utilities: For your office, shop, or workshop.
• Salaries: Don't forget to include a salary for yourself!
• Marketing & Advertising: Social media ads, flyers, etc.
• Software Subscriptions: Accounting software, website hosting, email services.
• Stock Purchases: To replenish what you’ve sold.
• Phone & Internet Bills.
• Bank Fees.
• Travel Costs or Fuel.

Putting It All Together: Finding Your ‘Magic Number’

The final step is to combine your startup costs and your monthly forecast to find out the total amount of funding you need.

1. Start with your opening bank balance. This is the money you have to invest on day one.
2. Subtract your Total Startup Costs. This happens right at the beginning.
3. For each month, track your cash. Take the balance from the previous month, add your monthly income, and subtract your monthly expenses. The result is your closing balance for that month.

By doing this for all 12 months, you will see if there are any months where you might run out of money. The lowest point your bank balance hits in that first year is the key figure. The total amount of money you need to launch is your Total Startup Costs plus enough to cover the cash shortfall in your toughest month.

This forecast is your financial guide. It gives you a clear-eyed view of what you need to succeed and helps you make smarter decisions as you grow. Keep it updated, and you'll always know where you stand.