S corp bookkeeping differs from sole proprietor books in how the owner is paid. The owner who works in the business takes a salary through payroll, takes other money out as distributions recorded apart from wages, and is repaid for business costs through a reimbursement plan. The books must keep those three flows separate all year.
What makes S corp bookkeeping different from sole proprietor books?
An S corporation is a corporation that has elected to pass its income through to its shareholders for federal tax. For the bookkeeper, the change is that the owner becomes both an employee and a shareholder. Owner money moves through payroll, distribution and reimbursement accounts instead of a single owner draw account.
A sole proprietor's books treat the owner and the business as one taxpayer. Money the owner takes out is a draw, and nobody asks whether it was salary. An S corporation is a separate entity that files its own return, so every dollar paid to the owner has to be labeled by type.
Owner-related accounts in an S corp
The table shows the accounts most S corp books need for owner activity, with example statement lines that would land in each. The payee text and amounts are illustrations.
| Account | Type | Example statement line | Example amount |
|---|---|---|---|
| Officer wages | Expense | GUSTO NET PAY 0315 (owner portion per payroll report) | 3,850.00 |
| Payroll taxes, employer | Expense | GUSTO TAX 0315 (employer share per report) | 612.40 |
| Payroll liabilities | Liability | Withholding held until the provider remits | varies |
| Shareholder distributions | Equity | ONLINE TRANSFER TO CHK ...8820 | 5,000.00 |
| Shareholder contributions | Equity | DEPOSIT FROM J ORTEGA | 2,500.00 |
| Accountable plan reimbursements | Expense, by category | EXPENSE REIMB J ORTEGA MARCH | 418.75 |
| Shareholder loan | Asset or liability | Only with a written loan | varies |
Payroll provider lines usually combine many people and amounts, so post them from the provider's register rather than from the bank line alone. The bank line proves the total; the register supplies the split.
Equity accounts look different too
A sole proprietor has owner's equity and draws. An S corp has stock, paid-in capital, retained earnings and the distribution account. Each closes into retained earnings at year end in the accounting system. Ask the preparer how they want the equity section set up when a client first elects, so the opening balances match the prior return.
Owner salary through payroll in S corp books
An owner who works in the S corp is paid a salary through payroll, with withholding and employer taxes, just like any other employee. The bookkeeper records the gross wage, the employer taxes and the withholding from the payroll provider's report, and checks that the net pay matches the bank line on the payroll date.
The IRS page on S corporation compensation and medical insurance issues says S corporations must pay reasonable compensation to a shareholder-employee for services before non-wage distributions, and that the IRS can reclassify other payments as wages. The page lists factors such as duties, time spent and what comparable businesses pay.
The bookkeeper records; the preparer advises
The amount of salary is a decision for the owner and their tax advisor. The bookkeeper's part is accurate records: payroll posted on schedule, officer wages in their own account, and a report at year end showing total officer wages next to total distributions. If an owner took distributions all year and no salary, say so to the preparer early. Do not fix it by recoding distributions as wages yourself.
Monthly payroll check
Each payroll month, compare three figures: the gross wages on the provider report, the wage expense in the books, and the net pay plus tax withdrawals on the bank statement. A difference usually means a payroll was posted from the bank line alone and the split was guessed.
Keeping S corp distributions apart from wages
A distribution is money the S corp pays its shareholders as owners, not as employees, with no payroll withholding. It goes to an equity account, never an expense. Keeping distributions apart from wages matters because the two are treated differently, and the preparer needs both totals to be clean and separate at year end.
On a bank statement, distributions often look like plain transfers to the owner's personal account. A rule that codes every transfer to the same personal account as a distribution works for most clients, as long as reimbursements travel by a different route or carry a clear memo.
Distributions with more than one owner
When an S corp has two or more shareholders, record each owner's distributions in a separate sub-account so the totals are visible per person. Then compare those totals with ownership. If a 50/50 company paid one owner 30,000.00 and the other 12,000.00, flag that to the preparer rather than balancing it with an entry. Uneven distributions can matter for an S corp, and the preparer decides what they mean.
Partnerships handle owner payments with a different vocabulary of guaranteed payments and partner capital. The guide to partnership bookkeeping covers those accounts, which is useful when a client asks whether their structure changes the books.
Accountable plan reimbursements on S corp statements
An accountable plan is a written arrangement under which the S corp repays employees, including the owner, for business costs they paid personally. When it is followed, the repayments are not wages. The bookkeeper records each reimbursement to the expense accounts it covers, backed by the owner's expense report, not to distributions or wages.
IRS Publication 15 sets three requirements: the expenses must be allowable and incurred while working for the employer, they must be substantiated within a reasonable period, and any excess must be returned within a reasonable period. It states that amounts paid under an accountable plan are not wages.
Booking a reimbursement
- Get the owner's expense report: dates, amounts, business purpose and receipts.
- Post one entry that splits the reimbursement across the expense accounts it covers.
- Match the entry to the bank line that paid it.
- Keep the report and receipts with the month's records.
A reimbursement that arrives as a round number with no report behind it does not meet those requirements. Post it to distributions until the paperwork arrives, and tell the owner why. Home office and mileage reimbursements are common under these plans, and they need the same report.
S corp health insurance for a more-than-2% owner
Health insurance premiums the S corp pays for an owner holding more than 2% of the stock are recorded by the corporation and reported as wages on that owner's Form W-2. In the books, the premium is an expense, and the payroll provider needs the annual amount so it appears on the W-2.
The IRS compensation page says these premiums are included in Box 1 wages but not in the Social Security and Medicare wage boxes, and that the S corporation must ultimately pay the premiums and report them as compensation. If the owner paid the premium personally, the S corp must repay it for this treatment, so the reimbursement needs to be visible in the books.
What to send the payroll provider
Send the total premiums paid for each more-than-2% owner, and the months covered, before the provider runs its year-end forms. Ask the provider in November how they want to receive it. A premium that never reaches the W-2 is a correction the preparer will have to work around.
Which S corp year-end items does the preparer check?
The preparer checks that owner pay, distributions and the balance sheet hold together. Before the return, they want officer wages that match the W-2s, distributions by owner, a balance sheet that ties to bank and loan statements, retained earnings that roll forward from last year, and a list of assets bought or sold.
An S corp year-end checklist
- Officer wages in the books equal the W-2 totals from the payroll provider.
- Health premiums for more-than-2% owners were reported to the provider.
- Distributions are recorded per shareholder, with totals for the year.
- Shareholder contributions are in equity, not income.
- Every bank, card and loan account reconciles at year end.
- Opening retained earnings equals last year's closing figure on the prior return.
- Assets purchased and disposed of are listed with dates and amounts.
- Any shareholder loan has a written agreement and an interest record.
- Reimbursements are backed by expense reports.
Asset purchases are a frequent source of questions. The guide to building a fixed asset list for the tax preparer lists what to include for each item.
AutoBankConvert keeps each client's accounts, rules and history in a separate workspace, which helps when a single owner has an S corp and a personal side business: rules written for one set of books never code the other. See how a monthly batch runs.
S corp bookkeeping mistakes that come from old sole proprietor habits
Most S corp bookkeeping errors start when a client elects S status and keeps paying themselves the way they did as a sole proprietor. Transfers to personal accounts continue with no payroll behind them, personal bills stay on the business card, and the old owner draw account keeps collecting lines that should be split three ways.
The mistakes to watch for after an election
- Draws with no salary. The old pattern continues and payroll never starts. Flag it to the client and preparer in the first month you see it.
- One owner account for everything. Wages, distributions and reimbursements all land in "owner draw". Split them before year end, not in February.
- Personal expenses as company costs. These become distributions, or a shareholder receivable if the preparer prefers, never expenses.
- Equity carried over unchanged. The sole proprietor's equity balance needs to be mapped to the corporation's opening equity, with the preparer's input.
- Payroll posted from the bank line. The net pay alone hides the taxes and withholding.
Pricing the extra work
S corp books take more time than sole proprietor books: payroll reconciliation each month, distribution tracking and more year-end items. If your fee was set when the client was a sole proprietor, revisit it after the election. The guide to hourly versus fixed-fee bookkeeping helps decide how to charge for that added scope.