Split Transaction
A split transaction is a single bank transaction categorized across two or more accounts at once, with the amounts required to sum exactly back to the original total.
In short
One charge, several buckets. A $310 charge that's genuinely $280 of Materials and $30 of Supplies categorizes as a single transaction with two splits, posting as one journal entry with three lines rather than several separate transactions.
Also called: split categorization, transaction split
A split transaction is what happens when one real charge genuinely belongs to more than one category. A single $310 credit-card charge might be $280 of Materials and $30 of Supplies — rather than forcing an artificial choice of one account for the whole amount, categorizing lets it split across both, as long as the pieces add up exactly to the original $310.
Mechanically, a split doesn't create multiple transactions or multiple journal entries — it's still one bank transaction, categorized into one journal entry that happens to have more than the minimum two lines. The bank side stays a single line, crediting or debiting the account by the full original amount; the category side splits into as many lines as the split calls for.
The arithmetic is checked strictly: the pieces must sum to exactly the transaction's total, not approximately. A split that leaves even a cent unaccounted for is rejected the same way an unbalanced manual entry would be, rather than silently rounded or partially accepted.
What a split doesn't check is whether the split makes business sense — whether $280 and $30 are actually the right amounts for Materials and Supplies specifically, as opposed to some other combination that happens to also sum to $310. That judgment is still the categorizer's, the same as choosing a single account correctly.
What people get wrong
- Assuming a split can be approximate — the pieces must sum exactly to the transaction's total, with no rounding tolerance.
- Assuming a split creates several separate transactions — it's still one transaction, posted as one journal entry with additional lines.
- Assuming an arithmetically correct split is automatically the right split — the tool checks that the numbers add up, not that the categories chosen make sense.
Common questions
- Can I split one charge across three or more categories?
- Yes — a split can cover as many accounts as needed, as long as every piece's amount sums exactly to the transaction's original total.
- Does a split transaction create multiple journal entries?
- No — it's one journal entry with additional lines on the category side, while the bank side stays a single line for the full original amount.
Machine-readable: /api/knowledge/concept:split-transaction