What does 'closing the books' actually do, and what are closing entries?

What are the two meanings of "closing the books"?

In everyday use, closing the books means finishing a period: transactions entered, adjustments made, reports run, figures treated as final. Software help uses the phrase this way. Intuit's Year-end guide for QuickBooks Online (updated August 21, 2026) says that when you finish the year-end review of your financial data, you can close your books. In QuickBooks the phrase also names a lock: the same guide says closing the books prevents unwanted changes, and Intuit's Lock your books in QuickBooks Online (updated September 15, 2026) labels the setting that locks past transactions "Close the books", with a closing date. That lock is a separate act from the year-end roll-forward.

The technical sense is narrower: it refers to closing entries, which carry the year's result out of the income and expense accounts into an equity account and leave those accounts at zero. The Financial Accounting Standards Board (FASB) defines comprehensive income, of which an entity's revenues and expenses are generally the primary source, as the change in equity of a business entity during a period from nonowner sources. In a corporation that equity account is retained earnings, which PwC's Financial statement presentation guide says consists of all undistributed income that remains invested in the reporting entity.

The two senses answer "what moved?" differently. Finishing a month moves nothing into equity unless the books are closed monthly. Closing the year moves the year's result into equity, whether you post the entries, your accountant does, or your software does it for you.

Which accounts reset and which carry their balances forward?

The IRS's Publication 583 says you close income and expense accounts at the end of each tax year and keep asset, liability and net worth (equity) accounts open on a permanent basis.

Intuit's and Microsoft's help pages describe what their own systems do at the year end:

What do closing entries move, and what does each account hold afterwards?

What does a close look like with figures?

Take an invented small corporation with a December 31 year end. After the year's adjustments its balances are sales revenue 84,000, rent expense 18,000, wages expense 40,000, supplies expense 6,000, dividends 5,000 and retained earnings brought forward 30,000. Net income is 84,000 − 64,000 = 20,000. QuickBooks Online and Desktop make the move recorded by entries 1 and 2 below on their own, so if you use them those entries are not yours to post; ask your accountant about entry 3. A hand-kept ledger, or an accountant closing it, can close the income and expense accounts straight into retained earnings (entries 1 and 2). Entry 3 closes the dividends there too, because the FASB defines distributions to owners as decreases in equity:

Each account before and after the close:

Where does the year's result end up, and what does that do to the balance sheet?

In the example the result lands in retained earnings, and because the closing entries touch no asset or liability account, assets, liabilities and total equity are the same just before and just after the close. What changes is how equity is shown: before, it is retained earnings brought forward plus the year's net income less dividends (30,000 + 20,000 − 5,000); afterwards, retained earnings holds 45,000 by itself.

Each year's close adds to the same account, so retained earnings is a running total, not one year's profit. Intuit's View retained earnings account details in QuickBooks page for QuickBooks Online (updated August 3, 2026) says the account shows income and expenses from all previous years.

Where the result lands, and whether it is then divided among owners, depends on the entity's equity structure. Establish for your own entity, with whoever prepares its returns, which equity account receives the result and whether it is then allocated. Tracking each owner's share is a separate question.

What is different at a month end compared with the year end?

If you close income and expense accounts only at the end of each tax year, as the IRS's Publication 583 describes, then at a month or quarter end you finish the period: post its adjustments, review it and report on it. Income and expense accounts are not reset. They keep accumulating through the year, and a monthly profit and loss report simply covers that month's dates. A large year-to-date revenue balance in July is expected, not an error, and entries posted to force it to zero would strip that income out of the year's figures.

Which date counts as the year end is set by the fiscal year configured in your system, not by the calendar. Intuit's Close your books in QuickBooks Desktop (updated August 5, 2026) says QuickBooks performs its year-end adjustments based on your fiscal year start month. Intuit's year-end guide for QuickBooks Online has you set this in the advanced settings, where you select the month you start your fiscal year. Microsoft's Closing the books page for Business Central (dated August 5, 2024) says a typical fiscal year contains 12 monthly periods but that you can define a year another way. If your year ends June 30, the reset belongs on June 30, so confirm the setting matches the year your books use. Choosing that year is a separate question.

Does your system post closing entries, or is anything yours to post?

It depends on the product. Four arrangements, with what each means for you:

When nothing is posted, the result still shows. In QuickBooks Online, a balance sheet dated in the new year carries it inside Retained Earnings, and Intuit's retained earnings page says that to see what makes up Retained Earnings you can run a Profit and Loss report. Intuit's QuickBooks Online lock page notes that the retained earnings account isn't the same as the retained earnings line on the balance sheet. To tie the year's result, use the Profit and Loss report by year and the Retained Earnings account Quick Report, as the retained earnings page describes. In QuickBooks Desktop, look at Retained Earnings on the first day of the new fiscal year.

Do not post manual closing entries in a system that rolls the year forward itself. The software already moves the year's result, so a second set moves it again. If your product is not listed, check its own help for what happens to retained earnings at the year end before posting anything.

What does closing not do?

It does not make the figures right. A close moves whatever balances exist, errors included. That is why adjustments and review come first. Closing before the period's adjustments are in leaves you correcting a period already treated as final. Which adjustments a period needs is a separate question.

It does not by itself stop later changes. Closing entries and roll-forwards leave the period editable unless a control protects it, and those controls differ by product:

• Microsoft's Business Central page says that even though a fiscal year has been closed, you can still post general ledger entries to it, and that you can post to a previous year after its income statement accounts are closed if you run the Close Income Statement batch job again afterward.
• Intuit's QuickBooks Desktop page describes protecting a prior period with a closing date password, and says a user must know that password and have the appropriate permissions to modify or delete a transaction in a closed period.
• Intuit's QuickBooks Online lock page describes the setting it labels "Close the books" to stop changes to past transactions, and one of its options lets users see a warning but still make changes.
• Sage's Close Fiscal Year help for Sage 50 (2026 edition, published June 17, 2026) is the opposite case: after you close the fiscal year, that year's general ledger transactions cannot be accessed or edited.

Setting up and managing a lock is a separate question.

How can you check that the close worked?

Run these checks on the first day of the new fiscal year:

• Net income starts the new year at zero. Where QuickBooks rolls the year forward, a balance sheet dated the first day of the new fiscal year should show no net income carried over from last year, and Retained Earnings should have risen by last year's net income; Intuit's QuickBooks Desktop page describes exactly this move.
• Equity moved by the year's result, less dividends or draws closed into it. Intuit's QuickBooks Online retained earnings page says that where Retained Earnings differs from the Profit and Loss report, transactions affecting only balance sheet accounts may have been entered against it, and those user-created transactions are listed on the Retained Earnings account Quick Report, run for All Dates.