Invoice capture software for UK businesses: what to test

Understand the difference between OCR and invoice capture

Optical character recognition, or OCR, converts visible characters into machine-readable text. Invoice capture organises information into fields such as supplier, invoice number, dates, amounts and individual lines. Products may combine OCR, document parsing and other extraction methods.

Reading the characters correctly does not guarantee that the right value reaches the right field. A document may contain an invoice date, a delivery date and a due date. A six-page invoice may repeat a running subtotal on several pages. Test whether the result preserves the meaning of the document.

Also separate extraction from coding. Reading a tax amount is different from choosing the correct accounting tax code. Reading a supplier name is different from matching the right supplier record. Those later decisions need their own checks.

Use a small test pack that represents your real queue

Select examples you are authorised to use and remove unnecessary personal or sensitive information. Keep a checked reference copy of the expected fields and lines, so every product receives the same test. This is a suggested evaluation pack, not a statistically representative accuracy benchmark.

Include a known difficult supplier layout. If it represents a large share of your monthly volume, its correction time matters more than an impressive result on a layout you rarely receive.

Check line completeness, not just the final total

Suppose a fictional invoice contains 24 charge lines across three pages, a delivery charge and a final discount. The correct result must preserve every charge, apply the adjustment once and reconcile to the invoice total. A correct grand total alone cannot prove the line breakdown is usable.

1. Count charge lines in the source and compare them with the captured lines.
2. Inspect the last line of one page and the first line of the next.
3. Check whether repeated column headings or subtotals became false items.
4. Confirm descriptions, quantities and unit prices stay attached to the correct line.
5. Recalculate the result after discounts, delivery and tax.

Check merged files too. A PDF with several pages of one invoice is different from a PDF containing several separate invoices. Ask which situation the product supports and what happens when documents must be separated. Do not infer support for automatic splitting from a multi-page capture claim.

For purchase-order workflows, check whether captured lines contain enough detail to support the two-way matching process you intend to use.

Keep the original and review tax-related fields

HMRC's VAT record-keeping guidance includes retaining received invoices, as originals or electronic copies, alongside required accounting records. A useful capture workflow keeps the source accessible and connects it to the resulting bill.

Check supplier identity, invoice reference, currency, dates, net amounts and tax amounts against the document. Preserve leading zeros in references and test an ambiguous date such as 04/05/2026. The reviewer must be able to resolve the intended date instead of silently accepting a format assumption.

Have the responsible finance person review tax-code mapping in the accounting system. Extraction does not determine whether VAT is recoverable or prove that an invoice is valid. A missing required detail should become a query, not an invented value.

Measure correction effort and complete invoices

Track whether the fields your process requires are correct, whether the lines are complete, and how long a person spends making the result usable. Count an invoice as correct without edits only when all required fields and lines pass review.

For example, if 12 of 20 test invoices need no correction, report “12 of 20 in this test pack”. Do not turn that small sample into a general accuracy claim. Record why the other eight needed work; repeated supplier mismatches demand a different fix from unreadable scans.

• Correction time: active minutes spent repairing extracted data.
• Line completeness: missing, duplicated or wrongly grouped items.
• Review visibility: how easily a person spots uncertain information.
• Publication result: whether the final bill agrees with the reviewed document.

Inspect the actual bill and attachment in Xero or QuickBooks Online. A successful upload is only the start of the workflow. Confirm how failed exports and retries are handled before processing live volumes.

Choose capture that fits the rest of your AP process

If one person reviews and records every bill, straightforward extraction and accounting publication may meet the need. If department managers authorise spend, capture must feed an approval process with clear ownership. Use the AP software versus accounting software guide to decide where each responsibility belongs.

ArrowBill supports multi-page invoice capture, header and line-item extraction, review and publication to Xero or QuickBooks Online. Team adds approval workflows and two-way PO matching. Test those capabilities with the same pack you use for every shortlisted product, and confirm plan details on the features page.

Once the trial shows realistic correction time, use the AP software cost worksheet to compare the subscription with the work it changes. Use the implementation checklist to plan the first live invoices.

Frequently asked questions