Comparison methodology

From two documents to reviewable evidence

InvoiceDrift compares one supplier invoice with a quote, purchase order, order confirmation or previous invoice. It shows the source values behind each potential difference.

1. Check the document pair

The service verifies that the files are supported, distinct and usable, then identifies which document is the invoice and which is the comparison record. Digital documents with clear description, quantity, unit-price and line-total rows provide the strongest input.

2. Extract and match line items

InvoiceDrift first uses exact descriptions, product identifiers and strong mutual description similarity. A confirmed correction can be reused as private match memory for that business. If ambiguity remains, optional advanced matching can rank sanitised descriptions without receiving financial values.

3. Separate resolved from unresolved lines

A match is accepted only when it meets the relevant confidence and consistency checks. Ambiguous lines are marked provisional or unresolved and excluded from financial totals rather than silently paired.

4. Calculate and evidence differences

For accepted matches, the report compares quantities and unit prices and calculates the net line variance from those source values. The result is evidence for review, not a finding of fault.

What the result means

A difference may be expected, previously authorised or based on documents with different commercial terms. A person should confirm the documents, match and business context before acting.