Split transaction
A single bank statement line coded to two or more nominal accounts, cost centres, or VAT rates within one bookkeeping entry, so that the full amount clears the line while the underlying spend is correctly distributed across the books.
A split transaction arises whenever a single payment or receipt needs to be recorded against more than one account. A common example is a £600 supplier payment that covers £400 of office supplies (standard-rated) and £200 of postage (zero-rated). Booking the full £600 to one account would misstate both the expense breakdown and the VAT return.
In Xero, a split is created at the reconciliation screen by adding multiple lines to a single bank statement line, each with its own account code, amount, and VAT rate. The lines must sum exactly to the bank line total before Xero will confirm the match. Bank rules can automate simple recurring splits — the same proportions every month — but variable amounts or mixed VAT rates drop out of automated matching and need manual review.
Why it matters at month-end
Skipping the split and posting to whichever account looks nearest is one of the most common sources of misclassified spend. On a VAT return the error may be small per transaction, but it compounds across a quarter. At year-end, an accountant cannot easily distinguish a legitimate single-account expense from one that should have been divided, so the correction happens late and at cost. Handling the split at reconciliation time is always cheaper than unwinding it later.