As of 13 August 2026, AI can budget for your UK VAT payments.

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 30 minutes until you can act on the result.

   How to actually do it

   1. Open your accounting software, bank records and recent VAT returns, then gather monthly sales, purchases, VAT amounts, current cash, other committed payments and the VAT payment dates shown in your records.
   2. Confirm your VAT accounting scheme, return period, payment method and payment dates against your current HMRC or GOV.UK records, and mark any item you cannot confirm as unknown.
   3. Paste the gathered figures into the prompt, keeping net amounts, VAT amounts, gross amounts, dates and payment descriptions in separate labelled columns.
   4. Paste the completed prompt into ChatGPT, Claude or Gemini and ask it to produce the cash budget, VAT payment schedule, formulas, missing-input list and scenarios requested.
   5. Compare every opening balance, sales total, purchase total, VAT total, other payment and payment date in the response with the source records, then correct the prompt and regenerate any row that does not reconcile.
   6. Check uncertain VAT treatment and any uncertain HMRC payment date with your accountant or current GOV.UK guidance, then copy the verified schedule into your spreadsheet and use it to set aside the required cash.

   Prompt

   Help me build a cash budget for my UK VAT payments. This is planning support, not professional advice, and you must not file anything or decide uncertain VAT treatment for me.
   
   Use only the figures and dates I provide. Do not invent missing figures, VAT rates, payment deadlines or assumptions. If information is missing, list it clearly and show the calculation without that item rather than guessing.
   
   My business details:
   - VAT accounting scheme: [standard / flat rate / cash accounting / other / unknown]
   - VAT return period and payment date: [period and date, if known]
   - Opening cash balance: [amount]
   - Current cash balance: [amount]
   - Expected sales by month, excluding VAT where available: [paste figures]
   - Expected purchases and expenses by month, showing VAT separately where available: [paste figures]
   - VAT on sales by month, if already calculated: [paste figures]
   - VAT reclaimable on purchases by month, if already calculated: [paste figures]
   - Previous VAT return figures and payments: [paste figures]
   - Other tax, payroll, loan and supplier payments: [paste figures and dates]
   - Minimum cash buffer I want to keep: [amount]
   
   Create:
   1. A month-by-month cash budget showing opening cash, expected receipts, expected payments, VAT movements, other committed payments, closing cash and cash above or below my buffer.
   2. A separate schedule of expected VAT payments, using only the payment dates I supplied or clearly labelling dates that still need confirmation from HMRC or my accountant.
   3. The formula for every VAT figure and the source data used.
   4. A base case, a lower-sales case and a higher-purchases case. Do not choose percentages for the scenarios unless I provide them. Ask me for scenario assumptions if they are needed.
   5. A list of figures I must verify against my accounting records, VAT returns, bank statements and current GOV.UK guidance.
   6. A short list of questions for my accountant where the VAT scheme, transaction treatment or payment date is uncertain.
   Keep the result in pounds, separate VAT from net amounts, preserve the precision of my source figures, and flag any month in which the cash balance falls below my stated buffer.

   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.