income summary
/ IN-kum SUM-uh-ree /
When you close the books, you have to funnel dozens of revenue and expense accounts down into a single profit-or-loss figure that then goes to the owners. Rather than do that in one messy step, accountants use a temporary holding account as a meeting point. Income Summary is that account — a scratch pad used only during closing, where all the revenues and all the expenses are gathered together so their net result can be calculated and then sent on to equity.
It works in a tidy three-act sequence. First, every revenue account is closed by crediting Income Summary, so its credit side now totals all revenue. Second, every expense account is closed by debiting Income Summary, so its debit side totals all expenses. The balance left in Income Summary is exactly the period's net income (a credit balance) or net loss (a debit balance). Third, that balance is closed out: a net income is moved by debiting Income Summary and crediting Retained Earnings; a net loss flows the other way. After this final step, Income Summary itself returns to zero.
Income Summary is purely a bookkeeping convenience — it never appears on any financial statement and exists only for a few moments during the closing process. Some accountants and most software skip it entirely, closing revenues and expenses straight to Retained Earnings. Understanding it still helps, because its single balance is a clean internal check: the number sitting in Income Summary just before it is closed should match the net income reported on the income statement.
After revenues of 90,000 are credited and expenses of 65,000 are debited to it, Income Summary shows a 25,000 credit balance — the year's net income. Closing it: debit Income Summary 25,000, credit Retained Earnings 25,000. Income Summary returns to zero, having done its one job.
Income Summary briefly holds net income, then passes it to equity and vanishes to zero.
Income Summary is itself a temporary account that never appears on the financial statements. It is optional — many systems close revenues and expenses directly to Retained Earnings and skip it entirely.