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AI for invoices and expenses: what actually pays back

"AI bookkeeping" is sold as one thing. It's really three, and they have very different payback.

The three layers, cheapest first

1. Capture. Photograph a receipt, get structured data: vendor, date, amount, tax. This is a solved problem and it is usually free — most business cards and banks now bundle it, and standalone receipt apps start at a few dollars a month.

2. Categorisation. Mapping that data to your chart of accounts. Cheap to buy, but only pays back if you review it monthly; unreviewed auto-categorisation is just a faster way to be wrong.

3. Reconciliation. Matching invoices to payments and chasing the mismatches. This is where the real hours live — and the only layer worth a real subscription.

The payback test for this category: (hours of bookkeeping per month) × (what an hour costs you or your bookkeeper) − (monthly price). If the tool only speeds up capture, the number is usually tiny — because capture was never the expensive part.

Where the hours actually are

TaskTypical monthly cost of doing it by handAI payback
Typing receipts1–3 hSmall — and mostly free already
Categorising + coding2–5 hMedium, only with monthly review
Chasing mismatches, late invoices3–8 hHigh — this is the real target

What to check before you buy

• Does it connect to your bank and your accounting software? If you still export CSVs by hand, you bought a prettier spreadsheet.
• Who owns the data and can you export it? Your books must survive a switch.
• How does it handle tax and VAT lines? This is where generic tools quietly fail.
• What happens on an unusual transaction? Good tools flag it instead of guessing.

When to cancel

If the tool cannot tell you, in one number, how many hours it saved last month — and you cannot reconstruct that number yourself — cancel it. In this category, "we'll figure out the value later" almost always means zero.

Every Tuesday I run this math on new AI tools and publish the ones that pass — with the numbers.

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Prices and bundles move fast in this category. Treat every range above as a shape, and check the vendor's current terms before you pay.