The Spending Autopsy: Find the Money Leaks You Can't See
Upload a year of bank statements and let Claude show you exactly where your money is quietly disappearing — with dollar figures, not vibes.
You know roughly what you earn. You have a much fuzzier idea of where it all goes. Somewhere between the pay hitting your account and the end of the month, a few hundred dollars evaporate and you genuinely could not tell someone where.
It's not that you're bad with money. It's that the leaks are invisible by design — a subscription you forgot renews, the "just grab something" lunches, the delivery fees, the app that charges you $14.99 on the 3rd of every month for a thing you used twice. Individually they're nothing. Together they're a holiday.
Here's the good news: the evidence already exists. Twelve months of it, sitting in your banking app. You've never had the time or patience to go through it line by line — but Claude does. Upload your statements and it becomes a forensic accountant that categorises every transaction, spots the patterns you're too close to see, and tells you the top three things to fix and what each one is worth. You decide what to cut. It just makes the invisible visible.
What You Need
- A free or Pro account at claude.ai. The free tier works, but Pro handles larger files and longer analysis more comfortably.
- 3–12 months of bank and credit card statements as PDF or CSV (most banks let you export these in a couple of taps). More months = better pattern detection.
- 15 minutes and a slightly brave attitude. This is an autopsy, so expect a few "oh no" moments.
- A quick privacy note: treat your statements like the sensitive documents they are. If you'd rather, black out or delete your account numbers before uploading — Claude only needs the transactions, not your BSB.
Step 1: The Full Categorisation
First, we get everything sorted. Download your statements, upload them into a new Claude chat (you can drag multiple files in at once), and paste the prompt below. Don't pre-clean the data — messy is fine, that's the point.
You are a meticulous forensic accountant reviewing my personal spending. I've uploaded [NUMBER] months of my bank and credit card statements. Your job: categorise every transaction and give me an honest picture of where my money actually goes. Steps: 1. Read every transaction across all files. If any are ambiguous (unclear merchant names, transfers between my own accounts, etc.), list them separately as "Needs my input" rather than guessing. 2. Sort all spending into clear categories: Housing, Groceries, Eating out & delivery, Transport, Subscriptions, Shopping, Health, Entertainment, Fees & interest, and anything else you find. Create sensible sub-categories where it helps. 3. Produce a summary table showing, per category: total spent, monthly average, and % of total spending. 4. Tell me my total spend, my average monthly spend, and (if income is visible) my average monthly surplus or shortfall. 5. Call out the 5 biggest single categories and the 5 biggest individual merchants by total dollars. Rules: Use Australian dollars. Be precise with numbers — show your working if a figure looks surprising. Do not flatter me or soften anything; I want the real picture. Flag anything you're genuinely unsure about rather than inventing a number. Start by telling me how many transactions you found and the total across all files, then give me the full breakdown.
What just happened: you turned a year of chaotic line items into a clean map of your money in about 30 seconds. Most people have never once seen their spending laid out this way. The categories alone will surprise you — "eating out" is almost always bigger than anyone thinks.
Step 2: The Leak Hunt
Now we go looking for waste specifically. A big category isn't automatically a problem — rent is meant to be big. Leaks are different: money that leaves with little to show for it. Ask Claude to hunt them.
Now switch roles: you're a sharp, money-savvy friend who's brilliant at spotting waste — the kind who looks at a statement and goes "wait, why are you paying for THAT?" Using the same statements, find my money leaks. A leak = spending that's recurring, forgettable, easily reduced, or delivering little value for the dollars. Specifically hunt for: 1. Subscriptions and recurring charges — list every one you can find, the amount, the frequency, and the annual cost. Flag any that look duplicated, forgotten, or rarely used. 2. "Death by a thousand cuts" spending — small, frequent purchases (coffees, delivery fees, convenience-store top-ups, in-app charges) that add up to a large annual total. Show me the annual total for each pattern. 3. Fees, interest, and avoidable charges — account fees, late fees, ATM fees, foreign transaction fees, overdraft interest. 4. Lifestyle creep — anything where spending has clearly climbed over the months. For each leak, give me: what it is, the monthly cost, the ANNUAL cost, and a one-line note on how hard it'd be to cut. Rank them by annual dollar impact, biggest first. Be brutally honest but never preachy — I want to feel informed, not lectured.
What just happened: this is the reframe that changes behaviour. A $6 delivery fee is nothing; "$1,400 a year on delivery fees" is a plane ticket. Seeing the annualised number next to each habit is what makes the fix feel worth doing — and it's a calculation almost no one does for themselves.
Step 3: The Top 3 Fixes
Insight without action is just guilt. Now we convert the autopsy into a plan — and crucially, one that fits your actual life, not a spreadsheet fantasy where you never buy coffee again.
Based on everything you've found, give me my Top 3 Fixes — the three changes that would save me the most money for the least pain. For each fix, give me: - The change, in one plain sentence - What it saves me per month and per year (real numbers from my data) - A "pain level" of Easy / Medium / Hard, and why - The exact first step I'd take this week to do it Then add up the three annual savings and tell me the total — and reframe that total as something tangible (e.g. "that's X" — a trip, a debt cleared, a savings buffer). Rules: Prioritise realistic, sustainable changes over extreme ones — I want fixes I'll actually stick to, not a crash diet. Don't suggest I cut things that clearly bring me joy or value; target genuine waste. If you need to ask me up to 3 questions to make the recommendations sharper (e.g. whether I still use something), ask them first. I set the priorities here — you're just showing me where the easy wins are.
What just happened: you now have three specific, dollar-quantified moves ranked by effort, plus the exact first step for each. That last instruction matters — Claude isn't deciding your life is too indulgent, it's surfacing waste and handing you the choice. You stay the decision-maker.
Bonus: Turn It Into a Living Money Tracker
One autopsy is powerful. A repeatable one is transformative. Set this up as a Claude Project so you can drop in each new month's statement and get an instant check-in.
Help me turn this into a monthly money check-in I can repeat. Write me a short, reusable prompt I can save and paste into a Claude Project each month, along with my latest statement. It should: categorise the new month, compare it against the averages you calculated today, flag any leak that's crept back in or any new recurring charge, and give me one thing to watch next month. Keep the saved prompt tight and copy-paste ready.
What just happened: you've built yourself an ongoing early-warning system. New sneaky subscription? It gets caught next month instead of next year. This is the difference between a one-off clean-up and actually staying on top of your money.
Bonus: Pressure-Test a Single "Worth It?" Category
Sometimes you don't need the whole picture — you just want to interrogate one thing you feel weird about.
I want to interrogate my [CATEGORY, e.g. food delivery / rideshare / online shopping] spending specifically. Using my statements, show me: the total over the period, the monthly trend, my most frequent merchants, and the single most expensive month. Then ask me 2–3 sharp questions to help me decide what this spending is really buying me — convenience, time, comfort, avoidance — so I can judge whether it's worth it. Don't tell me the answer; help me think it through.
What just happened: instead of a blanket "spend less," you get a focused, honest look at one habit — and questions that help you decide for yourself whether it's a leak or a genuinely good use of money. That's the whole game: think better, not just spend less.
None of this outsources your judgement. Claude didn't decide what you value or hand you a budget to obey — it read a year of evidence you never had time to read, made it legible, and pointed at the leaks. What you cut, keep, or happily keep paying for is entirely yours. You just finally get to make those calls with the full picture in front of you instead of a vague sense of dread. That's the difference between AI doing your thinking and AI sharpening it.
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