Anomaly detection

Finn spots what looks wrong before you close the month.

At month-end and in your reports, Finn flags the one-off that doesn't fit, shows exactly what moved between two months, and catches balance mismatches and duplicates automatically.

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accounts-os.com/month-end
Month-end reviewLive
Anything odd this month before I close?
FOne-off £4,800 to Harlow Fit-Out, your largest payment this month. Worth a check.
FFinn flagged it before the month closed.
Live

In short

AccountsOS flags what looks unusual before you close the month: an AI-reviewed month-end list of exceptions and unusual transactions, a deterministic variance analysis showing what changed between two months in Reports, automatic flags when a bank balance doesn't tie to its statement, and automatic detection of duplicate documents and duplicate bank accounts.

Month-end
AI-reviewed flags
Deterministic
Variance from the GL
Automatic
Mismatch + duplicate checks

Everything it does

Month-end review

  • Reviews the month's exceptions and largest transactions
  • Flags anything else worth a glance: an unusual one-off, a big swing vs last month
  • Each flag scored action, warning or info
  • Surfaces on /month-end before you close

Variance analysis

  • Month-over-month change per category, computed from the general ledger
  • Income, expenses and net shown with the exact change
  • AI explains the likely drivers in plain English, never the numbers
  • Shown as the Variance tab in Reports

Balance and duplicate checks

  • Flags when a bank account's balance doesn't tie to its statement
  • Flags missing bank statement months
  • The same document sent twice is kept once, by content hash
  • The same bank account added twice (a statement upload and a live feed) is flagged so you can merge them

Capabilities at a glance

AI-reviewed month-end flags, prioritised by severity

Deterministic month-over-month variance from the general ledger

AI narration of what's driving each change, never the numbers

Balance-mismatch flag when a bank account doesn't tie to its statement

Missing-statement-month flag

Duplicate document detection by content hash

Duplicate bank account detection with a human-confirmed merge

Recurring and subscription spend spotted and totalled monthly and yearly

How It Works

1

Your books update

Every transaction, receipt and statement you add feeds the same ledger Finn reviews.

2

Finn reviews at month-end

Finn reads the month's exceptions and largest transactions and writes a prioritised list of flags, including anything else worth a glance.

3

Reports show what moved

The Variance tab computes the exact change per category from the ledger, then Finn explains the likely drivers.

4

Mismatches and duplicates surface automatically

A balance that doesn't tie out, a missing statement, a duplicate document or a duplicate bank account each raise a flag.

Real-world Use Cases

Before you close the month

Finn's month-end review catches the one-off you'd have missed, so you close with confidence, not a guess.

Reading the P&L without a spreadsheet

Software spend up £640 on last month, mostly Figma: the Variance tab shows why, not just that it moved.

The same statement, uploaded twice

The same file sent twice is kept once, so a re-sent statement is not imported twice.

Why founders pick this over the spreadsheet

Catches the outlier before you sign off the month, not after

Explains what moved, not just that it did

Balance and duplicate checks run automatically, nothing to switch on

Frequently Asked Questions

Does it detect fraud?

No. It flags unusual activity, like an unusually large one-off payment, for you to look at. It's not a fraud-detection service, and it never blocks a payment or takes action on its own.

What counts as unusual?

At month-end, Finn looks at the largest transactions and anything that looks like a big swing versus last month. In Reports, the Variance tab shows the exact month-over-month change per category from your general ledger, and Finn explains what's likely driving it.

What if my bank balance doesn't match my statement?

Finn flags it as soon as the mismatch is found, with the amount it's out by, so you can find the missing or duplicate transaction.

Does it catch duplicate uploads?

Yes, two ways: the same document uploaded twice is kept once by its content, and the same bank account connected twice (a statement upload and a live feed) is flagged so you can merge the two.

Explore more of AccountsOS

Financial Reports

Profit, cash and what your company is worth, live. Proper statements underneath: P&L, Balance Sheet, Cash Flow.

Automatic Categorisation

Every transaction filed in the right category, automatically. No more 'what was this payment?'

Receipt & Document Capture

Snap, forward, drop, dictate: receipts reach your books from 9 different channels.

Bank Reconciliation

Your bank feed teaches itself. The same payee never gets manually categorised twice.

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