I converted from a sole proprietorship to an LLC or S-corp — what happens to my books and records?

Did you form a new entity, change the tax classification, or both?

The IRS's single-member LLC page calls an LLC an entity created by state statute; Delaware's LLC Act, for example, makes an LLC formed under it a separate legal entity.

Tax classification is a separate layer. The single-member LLC page also says a one-member LLC is disregarded as separate from its owner for income tax unless it elects to be treated as a corporation, yet is a separate entity for employment tax and certain excise taxes. The Form 2553 instructions say the S election is made by a corporation or other entity eligible to elect to be treated as a corporation, and treat such an entity that meets their tests as a corporation from the election's effective date. An election therefore changes how the business is taxed, not who owns it.

Do the existing books continue, or does a successor set begin?

The test is whether a different legal entity now owns the business's assets and owes its debts. If the same entity continues and only its tax classification changes, the books continue past a dated cut-off. If the business moved into a new entity, that entity's records start at the transfer date; where the new entity is disregarded for income tax, one file or a new file can serve. Who reports as taxpayer and as employer decides which numbers and payroll records change, not whether the books continue. Treat this as a working rule and confirm it with whoever prepares your statements.

Whether a successor's financial statements are those of a new reporting entity is a separate call for whoever prepares them; Deloitte's roadmap section on presenting common-control transactions says entities should use judgment and consider all relevant facts and circumstances.

Where does the cut-off fall, and what belongs on each side?

The cut-off is the first day activity belongs to the new identity. For an election, the Form 2553 instructions say the IRS service center will notify the entity if its election is accepted and when it will take effect. That date may already have passed: the same instructions say Form 2553 generally must be filed no later than 2 months and 15 days after the effective date entered on it. Move anything posted since then to the new side, asking your return preparer first how amounts you took out in that stretch are treated.

For a new entity, use the transfer date in your own transfer documents. It cannot precede the date the entity exists under your state's law: for a Delaware LLC, the filing of its certificate of formation or the later date it specifies.

Everything dated before the cut-off belongs to the predecessor and everything from it to the successor, even while the same bank account and software file stay in use; entries left under the old identity support neither identity's reporting for the year.

After a move into a new entity, payroll divides at the same date. The Form 941 instructions treat changing from one form of business to another, such as from a sole proprietorship to a partnership or corporation, as a transfer; when a business is transferred during a quarter, the old and new owners each file a Form 941 for that quarter, reporting only the wages each paid. An election alone does not change the employer: the IRS's EIN guidance lists changing an LLC's tax election, and a corporation choosing S taxation, among changes needing no new EIN, so payroll continues on the same account and only your own pay changes.

Lock the predecessor's period once its cut-off entries are posted. Intuit's help on locking the books in QuickBooks Online (updated September 15, 2026), for example, says no transaction on or before the lock date can then be changed without approval, with a warning or a password prompt depending on the settings; the warning-only setting lets users see a warning and still make changes, so choose the password option and keep the password yourself.

What happens to the balances, and how is the opening position worked out?

After an election alone nothing moves; only equity is reclassified. After a move, the successor opens with what it received: the predecessor's closing position at the cut-off, less anything that stayed with you. If the move is accounted for as a transfer between entities under common control, the U.S. GAAP rule reproduced in Deloitte's roadmap section on measurement has the receiving entity initially measure the assets and liabilities transferred at their carrying amounts in the transferring entity's accounts; whether yours is accounted for that way is your accountant's judgment.

A successor set starts income and expense accounts at zero, your capital and drawings give way to the new form's equity accounts, and an asset you kept or a debt the new entity did not take on never enters its books.

The accounting basis decides what crosses. On the accrual basis, open customer invoices and unpaid bills that move cross as receivables and payables, and collecting or paying them later clears the balance without touching income or expense again. On the cash basis they are listed at the cut-off, not posted, and each is recorded once, when paid: the Schedule C instructions have a cash-method business report income actually or constructively received and deductible expenses actually paid, though a payment that creates an asset with a useful life beyond 12 months or the end of the next tax year may not be deductible, or only in part, in the year paid. Where the successor is a different taxpayer, settle with your return preparer which return reports an item billed before the cut-off but paid after it, before you record it. Keying opening balances into software, and clearing Opening Balance Equity, are separate questions.

What becomes of your capital and drawing accounts?

A proprietorship's equity is your capital, raised by profit and lowered by drawings. What you move into the new entity is your investment in it: the FASB's elements chapter defines investments by owners as increases in equity and distributions to owners as decreases. The successor needs equity accounts that fit its form:

• Single-member LLC with no election. Member's capital holds what you put in, and member's draws what you take out.
• S corporation. Capital stock and paid-in capital hold what you put in for your shares, retained earnings start at the cut-off, and a distributions account records payouts. The Form 1120-S instructions require an S corporation with accumulated earnings and profits to maintain the accumulated adjustments account (AAA), recommend it for all S corporations, and start its balance at zero on the first day of the first S corporation year. The same instructions use it to determine the tax effect of distributions and adjust it by tax items, such as income other than tax-exempt income, so keep it alongside the books, not as an extra equity account beside retained earnings.
• LLC that elected S status. The equity stays members' equity; keep what it held before the election apart from earnings after it, so that, where the return includes balance sheets, they can come from the books; the Form 1120-S instructions say they should agree with the corporation's books and records, and excuse some corporations from completing them.

Close the old equity to suit the path, after saving the period's reports. With a successor set, close the year's income and drawings into capital in the predecessor's books, dated the day before the cut-off. With one file for a single-member LLC with no election, leave income open, because you still file one Schedule C for the year, so the year's profit and loss must keep both sides of the cut-off; close only drawings into capital, then move capital to member's capital. After an LLC's election alone, close draws and income to date into member's capital, dated the day before the effective date.

What does the owner's equity look like before and after?

Dana, a sole proprietor, keeps accrual-basis books on a calendar year. Dana's transfer documents move the business into a new single-member LLC, with its own file, on August 1; Dana keeps the car, and the lender agrees to the LLC taking over the equipment loan. On July 31 the books show cash 18,000, receivables 6,000, equipment 12,000 net, car 4,000 net, payables 2,500, the loan 7,500, capital 21,000 at January 1, net income to date 19,000 and drawings 10,000. After the July reports are saved, the car leaves as a drawing and the year's accounts close into capital, dated July 31:

The LLC's opening entry on August 1, assuming carrying amounts are used, is:

After the closing balance sheet is saved, a transfer-out entry in the old file, dated July 31, takes each of those balances, and Dana's 26,000 of capital, to zero. The equity looks like this before and after, with a new S corporation shown for comparison:

On the cash basis, the receivable and the bill are on neither set of books, and the opening entry is:

The 6,000 becomes income when collected and the 2,500 is recorded when paid, each once.

Does the tax identifier or name change, and where must it be updated?

The legal name is the one in the document that formed the entity: Delaware's LLC Act, for example, has the certificate of formation set forth the LLC's name, and the Form 2553 instructions ask for the entity's true name as stated in its charter or other creating document. The taxpayer number depends on the path:

On a Form W-9, the IRS's instructions have a disregarded LLC give its owner's name on line 1 and the LLC's own name on line 2, and check the box for the owner's tax classification; an LLC taxed as an S corporation gives its own name as shown on its tax return, checks the LLC box with S, and enters its own EIN.

Update whatever changed, whether name, number or tax classification, in each of these places:

• The accounting file. Put the legal name and your path's numbers in the company settings, so documents issued from the cut-off carry them.
• Customers, banks and payment processors. The Form W-9 instructions say a requester who must file an information return must obtain your correct taxpayer identification number, and that you must furnish a new Form W-9 if the name or TIN changes for the account.
• Payroll. Wages from the cut-off run under the employer's EIN. Before the first successor payroll, ask the provider how it handles a new EIN mid-year and the predecessor's year-to-date wages.
• Contractors and vendors. Give vendors the new legal name. Keep each contractor's payments dated and tagged to the payer that made them. The IRS's single-member LLC page says a disregarded LLC generally must use your SSN or EIN for all information returns and reporting related to income tax; which payer reports which of the year's payments after an election or incorporation is a question for your return preparer.
• Check stock. Stop using checks printed with the old name, note the last number used, and count and void the unused checks.
• State accounts. Payroll, unemployment and sales-tax registrations are held with each state, so ask each agency how it wants the change reported.

What does the change do to how you pay yourself?

As a sole proprietor, nothing you took was wages: the Schedule C instructions exclude amounts paid to yourself from the wages line. A single-member LLC with no election changes little. The IRS's single-member LLC page says its individual owner is subject to self-employment tax in the same manner as a sole proprietorship; read with that, what you take out stays a draw recorded in equity, not wages.

An S corporation changes the arrangement. The IRS's page on S corporation compensation says S corporations must pay reasonable compensation to a shareholder-employee for services provided to the corporation before non-wage distributions may be made. The records must then support two streams:

• Your wages. They run through payroll under the entity's EIN, into an officer wages expense account.
• Your distributions. They go to the distributions account in equity, never mixed with wages or expenses.

How much to pay yourself, and the entries for draws against payroll, are a separate question.

How is a year split by the change reported and compared?

A change on the first day of a reporting year needs no split: the predecessor's year closes normally and the successor starts a fresh one. A change part-way through leaves two part-year periods in the books and in any return or payroll filing whose filer changes and, where a new employer takes over during a quarter, a split payroll quarter. For a single-member LLC with no election, prepare the Schedule C from the reports on both sides of the cut-off.

If the successor issues U.S. GAAP financial statements and the move is accounted for as a transfer under common control, Deloitte's roadmap section on presentation describes two outcomes: net assets received in a transfer that does not change the reporting entity are presented prospectively from the date of the transfer, and those in one that does, retrospectively for all periods during which the entities or net assets were under common control. It adds that practice generally treats a transfer of net assets that meet the definition of a business as a change in the reporting entity; the period of transfer is then reported as though the transfer had occurred at its beginning, with no break at the cut-off. Whether your move is that case is for whoever prepares the statements to confirm.

Label the cut-off on every report, and never set a part-year beside a full year without saying so. After an S corporation change, your wages and the employer payroll taxes on them are costs the proprietorship's profit never carried, so add them back when comparing profit across the change. Choosing the successor's fiscal year is a separate question.

What must happen to the old business's records?

The predecessor's records support its returns, including those still to be filed for the year of change. The IRS's record-keeping page says that, generally, you must keep the records supporting an item on your tax return; after a move, those returns are still yours, whoever holds the files. Decide where the records are kept; the Form 941 instructions ask a transferred business to name the person keeping the payroll records and the address where those records will be kept. The IRS's page on how long to keep records ties each period to an event:

• Records supporting a return. Generally, keep them until the period of limitations for that return runs out: the time in which you can amend it to claim a credit or refund, or the IRS can assess additional tax.
• Employment tax records. Keep them for at least 4 years after the date the tax becomes due or is paid, whichever is later.
• Property records. Generally, keep them until the period of limitations expires for the year in which you dispose of the property. For property received in a nontaxable exchange, keep the records on the old property as well as the new until it expires for the year in which you dispose of the new property.

Keep the purchase and depreciation records for assets that moved to the new entity too; whether the move counts as disposing of them is a question for your return preparer. Before discarding anything, the IRS's record-keeping page says to check whether other purposes, such as insurers or creditors, need the records longer; state rules are a separate check.

Keep the predecessor's file readable. Intuit's help on QuickBooks Online data after cancelling (updated August 5, 2026), for example, says a cancelled subscription leaves read-only access for one year, and that after a declined card you have 14 days to update billing before the account is suspended. Export reports and data before cancelling or changing billing on the old file.

In what order should the conversion be handled?

Work through the change in this order:

1. Fix the cut-off. Record the effective date and whether it marks a new entity, an election or both.
2. Complete the predecessor's period. Enter everything dated before the cut-off, and reconcile each account to it from statements you download yourself.
3. Save the period's reports. Save the profit and loss, trial balance and payroll reports to the cut-off before any closing entry.
4. List what crosses. Include only assets the successor owns and debts it owes, treating open invoices and bills as your basis requires.
5. Post the cut-off entries. Withdraw what stayed with you, then close equity as your path requires, dated the day before the cut-off.
6. Lock the predecessor's period. Save the closing balance sheet, post the transfer-out entry that takes what crossed and your capital to zero (not needed on the one-file path), dated the day before the cut-off, then lock the books to that date with a password you keep.
7. Record the opening position. Use carrying amounts if the move is accounted for as a transfer under common control, and check that debits equal credits.
8. Change the identity. Work through each place listed above for your path.
9. Split payroll and contractor records. Keep each employer's wages and each payer's contractor payments separate for the year.
10. Set up owner pay. Add member's draws, or officer wages and a distributions account.
11. Secure the predecessor's records. Name the keeper and location, export before cancelling or changing billing, and keep them for the IRS periods above.

After an election alone, steps 4 and 7 do not apply, and step 5 reclassifies equity at the effective date.