As of 13 August 2026, AI can only partly budget for business growth.

What to actually do

1. Use a tool built for this

   The route this page recommends

2. Do it yourself

   Second choice

   A chat interface, chat-fluent skill, and roughly 1 hour until you can act on the result.

   How to actually do it

   1. Open your accounting software and bank records, then gather recent revenue, fixed costs, variable costs, cash balances, unpaid invoices, bills, finance repayments and current payroll costs.
   2. Create a spreadsheet with one row per month and columns for revenue, variable costs, fixed costs, one-off spending, finance payments, opening cash and closing cash.
   3. Add the planned growth costs, including hires, contractors, marketing, equipment, premises, software and any funding repayments, marking each amount as including or excluding VAT.
   4. Paste the spreadsheet figures and the growth assumptions into the prompt, and add the minimum cash buffer you will not spend.
   5. Ask the model to produce the base budget, three scenarios, break-even view, assumptions and missing inputs without filling gaps with estimates.
   6. Reproduce the key totals and cash calculations in your spreadsheet, then compare every input against your bank records, accounting records, contracts and supplier quotes.
   7. Change uncertain assumptions one at a time to test whether the business stays above its cash buffer, and remove any scenario that depends on an unconfirmed figure.
   8. Send the final budget and its assumptions to your accountant for advice on VAT, payroll, tax, funding and the consequences of committing to the growth plan.

   Prompt

   Act as a budgeting assistant for a UK business. Build a practical growth budget from the information below, using pounds sterling and stating whether figures include or exclude VAT. Do not invent figures, tax treatment, sales, costs or funding terms. Where information is missing, mark it as an input I need to provide.
   
   Business type and current position:
   - Business: [describe the business and its products or services]
   - Legal structure: [sole trader, partnership, limited company or other]
   - Budget period: [months and start date]
   - Current monthly revenue: [amount and whether excluding or including VAT]
   - Current monthly costs, separated into fixed and variable: [paste list]
   - Current cash balance: [amount]
   - Money owed to the business: [amount and expected payment timing]
   - Money the business owes: [amount and due dates]
   - Existing loans or finance: [balance, repayments and interest if known]
   
   Growth plan:
   - Target growth: [describe the target and expected timing]
   - Planned hires or contractors: [role, start date and total employment cost if known]
   - Planned marketing and sales spend: [details and amounts]
   - Equipment, premises or software purchases: [details, dates and amounts]
   - Expected changes in pricing, volume or margins: [details]
   - Funding available or being considered: [details]
   - Minimum cash buffer I want to keep: [amount]
   
   Produce:
   1. A monthly budget for the period, showing revenue, variable costs, fixed costs, one-off costs, finance payments and closing cash.
   2. A comparison between the current plan and the growth plan.
   3. A conservative, central and optimistic scenario, changing only assumptions I have supplied or clearly labelled assumptions I must confirm.
   4. A break-even view showing the revenue or sales volume needed to cover the planned costs, using the supplied margin information.
   5. A list of every assumption, missing input and calculation that needs checking.
   6. The points that should be taken to my accountant, including VAT, payroll, corporation tax or income tax, funding and cash-flow implications. Do not give tax advice or claim that any cost is allowable without a qualified professional confirming it.
   
   Show the calculations clearly enough for me to reproduce them in a spreadsheet. Keep the budget separate from advice, and do not present an uncertain forecast as a fact.

   Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

3. Hand it to a person

   The distant third

   A person who owns the outcome does this end to end, worth it when the failure is dear.