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As of 13 August 2026, AI can split household bills fairly.
Most people should do this themselves; the prompt is on this page.
Can you do it?
5 minutesto a draft.
15 minutesto something you’d act on.
Cost, all in£0
Skill needednone
Who has to check ityou
What the alternative costsJulius AI analyses an uploaded spreadsheet and produces charts and analysis, while Emma provides an AI assistant across your UK accounts.
If this goes wrong: someone is charged too much or too little, and you can recalculate the split and correct the next payment.
What to actually do
Do it yourself
The route this page recommends
A chat interface, no skill needed, and roughly 15 minutes until you can act on the result.
How to actually do it
- Open your recent bank statements, utility bills and other household invoices, and make a list of each shared bill, its provider, billing period and total.
- Agree which people and costs belong in the split, and gather the income, occupancy or usage figures only if the household wants to use those methods.
- Remove account numbers, addresses and other unnecessary personal information before pasting the figures into the prompt.
- Paste the household details and bill list into the prompt, then ask the chatbot to calculate equal, income-based and usage-based versions.
- Compare every bill total and billing period in the response with the original statements, and recalculate any disputed line with a calculator.
- Discuss the assumptions and comparison table with the other household members, choose one method, and send each person the agreed amount and payment date.
- Keep the original bills and the final calculation together so you can update the split when a bill, household member or agreed method changes.
Prompt
Split these household bills fairly between [number of people] people. Use only the figures I provide and do not invent missing amounts, dates or usage. First list each bill, its billing period and its total. Then calculate these three options separately: equal shares, shares proportional to the incomes I provide, and usage-based shares where usage data exists. If a bill does not fit a method, say why and leave it out of that method rather than guessing. Show the formula and each person's amount for every bill, round only the final amounts to the nearest penny, and make sure the rounded amounts add back to each bill total. Flag duplicated bills, unclear billing periods, missing figures, unusual one-off charges and any bill that may not be a shared household cost. Finish with a comparison table and a short list of questions the household should agree before choosing an option. Do not recommend a method as objectively fair: explain what each method assumes. Here are the household details and bills: People and agreed details: [Paste names or labels, relevant incomes if using income-based sharing, and any agreed usage or occupancy details] Bills: [Paste each bill with provider, billing period, total, and usage information if available]
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
Use a tool built for this
Second choiceHand it to a person
The distant thirdA person who owns the outcome does this end to end, worth it when the failure is dear.
What it gets wrong
- AI cannot decide whether equal shares, income-based shares or usage-based shares will feel fair to everyone in your household.
- AI cannot know whether a charge is genuinely shared unless you explain who used the service and what the household has agreed.
- AI cannot retrieve complete and current bills from your bank unless you provide them or use a connected budgeting tool, and pasted statements may expose private data.
- AI can apply the wrong billing period or duplicate a charge if the source documents are unclear, so the original bills still need checking.
- AI cannot settle the relationship dispute that may sit behind a disagreement about what counts as a fair contribution.
Even on a YES, the friction has a name: judgement under ambiguity, relationship and private data access.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 2 |
| Verification | 2 |
| Liability | 2 |
| Effort delta | 2 |
| Total | 10 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can AI split household bills?
- Yes. Give it the bill totals, billing periods and the people involved, and it can calculate and explain several ways to divide them. You still need to check the figures and agree the method with the household.
- What is the fairest way to split bills with my partner?
- There is no universally fair method. Equal shares are simple, income-based shares reflect different ability to pay, and usage-based shares can reflect who consumes more. Ask AI to show all relevant options, then choose the one you both agree with.
- Can AI split bills based on income?
- Yes, if you provide the incomes and the bills to include. It can calculate each person's share in proportion to those incomes, but you must decide whether gross or take-home income and one-off costs should count.
- Can AI split bills from a bank statement?
- Yes, if you upload or paste a readable statement and identify which transactions are shared. Remove unnecessary account details first, and compare the extracted transactions with the original statement because AI can miss, duplicate or misclassify a payment.
Nearby answers
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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