Accrual Books, Cash-Basis Tax Return: Can You Keep Both?

Cash basis vs accrual for taxes: can the books and the return use different methods?

A company can keep accrual books and file on the cash method if the cash method is open to it and it keeps a reconciliation of the books to the return, with records to support it. IRS guidance says that satisfies the rule tying the return to the books (Rev. Proc. 2015-13, sec. 2.01(4)), and the Schedule M-3 instructions describe accrual statements with a cash-method return. Publications 334 and 583 put it more simply: use the same method for both. The method must still clearly reflect income, so a preparer should confirm the position before the next close.

A case is not simple when:

• An investor or lender has asked for accrual statements and no one has built the bridge to the cash return.
• The books are on cash today and are being moved to accrual. Moving the books alone does not change the return's method. A return that follows the new books does, and that needs IRS consent (last section).
• It is a C corporation, or a partnership with a C corporation partner, with gross receipts near the limit: cash may not stay open.
• A raise is about to add a corporate partner to a partnership, or turn an S corporation or LLC into a C corporation: the same limit then applies.
• A partnership, LLC or S corporation allocates more than 35% of its losses to owners who are limited partners or who do not actively manage the business: it is a syndicate, a kind of tax shelter, and cash is closed to it. An annual election can test the prior year's allocations instead (below).
• It sells goods, or builds under contracts that span tax years: the inventory rules and the long-term contract rules apply (Form 1065 instructions, section 460).
• A raise has pushed total assets toward the Schedule M-3 line, covered below.
• Past returns were filed on cash in a year cash may not have been open, or the method on them is unknown.

The routes:

Which fits depends on the figures, the entity and the investor's terms. Any case in the list above is worth a CPA's review before the next close (see "Different for you?").

Gather the monthly accrual books, dated lists of unpaid customer invoices and unpaid bills at each year-end, the last filed return with its method box and schedules, last year's reconciliation, the investor or loan clause that calls for accrual statements, the last three years' gross receipts, and a list of the owners with how losses are allocated among them and how any interests were offered.

What does the tax regulation say about the method your books use?

Taxable income is computed under the method the taxpayer regularly uses in keeping the books (section 446(a)). The regulation also contemplates differences between the books and the return, and requires records that support both.

The baseline ties the return to the books, and the revenue procedure says a documented reconciliation meets it. Conformity is only one test: the cash method must also be open to the entity (next section), and the IRS may recompute income under a method that clearly reflects income when the one used does not (section 446(b)).

The regulation says a method that applies generally accepted accounting principles consistently, with all items of gross income and expense treated consistently from year to year, will ordinarily be regarded as clearly reflecting income (Reg. 1.446-1(a)(2)). That speaks to the books' method. A cash return is a permitted method for an entity that may use it, and it takes expenses on cash as well as income (Reg. 1.446-1(c)(1)).

Who can use the cash method for tax at all?

Section 448 bars the cash method for C corporations, partnerships with a C corporation partner, and tax shelters. The first two have exceptions: farming businesses, qualified personal service corporations, and corporations or partnerships that meet the gross receipts test. A tax shelter has none (section 448). An investor's demand for accrual statements does not change who may use cash. Entity type, partners and receipts do.

The gross receipts test: average annual gross receipts for the three prior tax years must not exceed $32,000,000, the limit for this tax year (section 448(c); Rev. Proc. 2025-32, sec. 4.30). Companies treated as a single employer, such as a controlled group or an affiliated service group, count together. How to measure it, and what happens when it is passed, is in switching from cash to accrual.

A qualified personal service corporation does substantially all of its work in health, law, engineering, architecture, accounting, actuarial science, performing arts or consulting, and substantially all of its stock is held by the people who do that work, retired employees, their estates, or, for two years after a death, whoever received the stock because of it (section 448(d)(2)). A syndicate is an entity, other than a C corporation, that allocates more than 35% of its losses to limited partners or limited entrepreneurs (Form 1065 instructions). Owners who actively manage the business throughout the period, their spouses, children, grandchildren and parents, and owners who actively managed it for at least five years are not counted (section 1256(e)(3)(C)). The entity may elect each year to test the prior year's allocations instead. The partnership or S corporation makes the election, not its owners, by attaching a statement that cites Reg. 1.448-2(b)(2)(iii)(B) to its timely filed original return, extensions included. It covers one year, cannot be revoked, and also applies under other rules that use the same tax shelter definition (Reg. 1.448-2).

An entity other than a C corporation is also a tax shelter if interests in it were ever offered in an offering that securities law required to be registered, counting one that required a notice of exemption, or if a significant purpose of the arrangement is avoiding federal income tax (Reg. 1.448-2(b)(2)). An S corporation is not a tax shelter only because of a notice that every corporation offering securities in its state must file (section 448(d)(3)). A funded LLC or partnership should have a preparer check how its raise was offered.

How do accrual books and a cash-basis return reconcile?

The return carries the bridge on Schedule L, a balance sheet per the books, and on Schedule M-1, which reconciles book income to return income. Larger filers use Schedule M-3 instead of M-1.

• Total assets follow the books. The return takes total assets from the method regularly used in the books (Form 1120 instructions). Accrual receivables therefore count toward the Schedule M-3 line even though the return is on cash.
• Schedule L is the accrual balance sheet. It shows receivables and payables the cash return never counted, and Schedule M-1 explains the gap.
• A sole proprietor has no reconciliation schedule. Schedule C has none (instructions), so the bridge lives only in the records.
• Small filers may skip the schedules. The skip tests are in Schedule L on a corporate return. Skipping them does not end the duty to keep records that support the return (Reg. 1.446-1(a)(4)).

Tax effects of cash versus accrual: year-end receivables and unpaid bills

On accrual books a sale counts when it is earned and a bill when it is incurred. On a cash return a sale counts when the money is received and a bill when it is paid (Publication 538). The year-end gap is what the reconciliation lists.

Cash and accrual put the same dollars in different years. Each year's net reconciling amount is the change in the balance, so a growing receivable widens the gap and a shrinking one narrows it. The line names are from Form 1120; Forms 1120-S and 1065 have matching lines on their own Schedule M-1. A corporation that completes Parts II and III of Schedule M-3 reports the net of these differences on Part II, line 14, "total accrual to cash adjustment" (instructions).

A valid check received by December 31 is income that year on the cash method, even if deposited in January (Publication 334). A cost paid in advance follows its own rules: see prepaid expenses at year-end.

How does the IRS treat 1099s across accounting methods?

A Form 1099-NEC is keyed to payments made during the calendar year. The regulation requires an information return for payments a business makes during the calendar year (Reg. 1.6041-1(a)(1)). The 1099-NEC instructions count payments to a payee during the year against the threshold, which is $2,000 for this tax year. Neither mentions the payer's accounting method.

• Payments, not accruals, set the year. A bill booked in December and paid in January is a payment of the later year on that wording. Build the 1099 list from payment records, not from expenses accrued in the books, and leave out bills paid by card or payment network, which the processor reports on Form 1099-K (instructions).
• Forms you receive follow payments too. A customer's Form 1099-NEC or a processor's Form 1099-K reports what was paid to you in the calendar year, not what you earned (Reg. 1.6041-1(a)(1); Form 1099-K instructions). Expect book revenue to differ from those forms by the year-end receivable and prepayment changes in the table above, among other things. Tying them out is in books to the business tax return.
• The contractor's side can differ. A contractor on the accrual method reports income when it is earned (Publication 538), so its return and your 1099 can sit in different years.
• Who gets one is a separate question. See which contractors get a tax form.

What happens to inventory?

A business that makes, buys or sells goods generally needs inventory, and inventory generally requires accrual for purchases and sales, even when everything else stays on cash (Reg. 1.446-1(c)(2)). That mixed method is permitted for an entity that may use cash: accrual for purchases and sales, cash for all other items (Reg. 1.446-1(c)(1)(iv)). For an entity section 448 bars from cash, using cash for any item counts as using the cash method (Reg. 1.448-2(a)(3)).

A small business taxpayer is not required to keep inventories. It has average gross receipts at or below $32,000,000 for the three prior tax years and is not a tax shelter (section 471(c); Rev. Proc. 2025-32, sec. 4.30). Its inventory method is accepted if it treats inventory as non-incidental materials and supplies, or follows its applicable financial statement or, with none, its books and records. An audited statement prepared under generally accepted accounting principles and used for credit or reporting to owners generally counts as an applicable financial statement (section 451(b)(3)).

This is where accrual books reach into the return: for a company with no audited statements, the books can set the tax method for inventory. Changing the inventory method is itself a method change that needs Form 3115 (Publication 334). More in inventory or supplies for small sellers.

What records prove the bridge between books and return?

Keep the records that let a reader trace every book-to-return difference to a list and then to a payment. The instructions say to keep records for as long as their contents may become material in administering any internal revenue law (Form 1120 instructions); retention periods are in how long to keep business records.

1. The monthly accrual books, with an invoice date and a payment date on each sale and bill.
2. Dated lists at each year-end: unpaid customer invoices, unpaid bills, customer prepayments, costs paid in advance and inventory.
3. A schedule from book net income to return income, one line per difference, each tied to a list and to the bank record that cleared it the next year.
4. Last year's schedule, so this year's opening differences match last year's closing ones.
5. The filed return, with its method box and the schedules as filed.
6. A short memo of the method position and who approved it.
7. The list of payments behind each Form 1099.

When does the tax method itself have to change?

The tax method changes when the tax rules require it, or when the company chooses to move the return. A request from an investor or lender does neither.

• Required: cash is barred for a year when the entity is a tax shelter, or when a C corporation, or a partnership with a C corporation partner, fits no exception: farming, the gross receipts test, or, for a corporation, qualified personal service status. Failing one exception does not force a change while another still applies. A required change to accrual generally uses Form 3115 (Publication 538; section 448(a) and (b)). Necessary inventory puts purchases and sales on accrual unless the business is a small business taxpayer (Reg. 1.446-1(c)(2)).
• Chosen: the company moves the return to accrual to match the books, a method change that needs IRS consent on Form 3115.

A taxpayer that changes the method used in keeping its books must secure IRS consent before computing taxable income on the new method (Reg. 1.446-1(e)(2)(i)). A cash-to-accrual change on the return is a change in method (Reg. 1.446-1(e)(2)(ii)), requested on Form 3115 (instructions). A change in method occurs when the method used to compute taxable income changes (Rev. Proc. 2015-13, sec. 2.02(1)), so moving the books to accrual while the return stays on cash, with the reconciliation in place, does not change the tax method on its own. The steps, the adjustment and the timing are in switching from cash to accrual.

A company that moves its return to accrual and has an applicable financial statement, such as an audited statement used for credit or reporting to owners, must also include income no later than the time it is reported as revenue in that statement (section 451(b)). The rule applies to a taxpayer that uses an accrual method for federal income tax purposes (Reg. 1.451-3(b)(1)), so audited accrual statements beside a return kept wholly on cash do not trigger it.

Example

All figures are illustrative, in US dollars.

A consulting S corporation with unpaid invoices

A consulting S corporation bills $900,000 in Year 1 with no receivable at the start. Ignore expenses. $120,000 is unpaid on December 31. Its accrual books show $900,000 of revenue. Its cash return shows $780,000 of revenue. Schedule L shows the $120,000 receivable, and Schedule M-1 lists it as income recorded on the books and not on the return.

In Year 2 it collects the $120,000 in January and bills $1,000,000, of which $150,000 is unpaid at year-end. Collections are $970,000, so book revenue is $30,000 above the return: the $150,000 new receivable less the $120,000 collected. Schedule M-1 lists both amounts.

A venture-backed C corporation with a December bill

A C corporation has had about $3,000,000 of revenue a year and has no related companies, far under the $32,000,000 limit, so on these facts cash is open to it. Investors want accrual statements. A $45,000 bill for services done in December is paid in January. The books expense it in Year 1. The cash return deducts it in Year 2. Schedule M-1 lists it as an expense on the books not deducted on the return in Year 1, and as a deduction on the return not charged to book income in Year 2.

A raise leaves $10,400,000 of total assets at year-end on the accrual books, so the corporation files Schedule M-3. For a corporation of this size, the Form 1120 instructions let it complete Part I of Schedule M-3 and use Schedule M-1 in place of Parts II and III.

A December contractor bill paid in January

A business with accrual books owes a contractor $5,000 for work finished in December. The books record the expense in Year 1. The cash return deducts it in Year 2, when it is paid. Assume this contractor is one who gets a Form 1099-NEC, is paid by check or bank transfer rather than card, and that the $5,000 alone is over the reporting threshold. On the wording of the instructions, the Form 1099-NEC for this payment is for Year 2, because that is the year the payment was made. A contractor on the accrual method reports the $5,000 as Year 1 income. The two returns land in different years, and each side's records should say why.

Different for you?

• An investor or lender asked for accrual statements and no one has built the bridge to the cash return: whether the books or the return should move, and who keeps the reconciliation each year, has to be decided before the next close. See bookkeeping for the monthly books and the year-end lists the reconciliation is built from.
• Receipts near the limit, a C corporation, a corporate partner, or passive owners sharing losses: whether cash stays open is a tax-method question, including syndicate status and its annual election. See switching from cash to accrual. The year-by-year receipts and loss allocations come from the books (bookkeeping).
• A return was filed on cash in a year cash was not open, or the IRS has asked about your method: the section "We should have switched last year: what now?" in switching from cash to accrual covers the correction and its timing. A missed year also needs the books and year-end lists rebuilt (bookkeeping).
• Your US company is owned from abroad and the parent needs accrual figures: the US method rules and the parent's reporting both apply. See cross-border tax.
• You are choosing a method for a new business: cash or accrual for a small business.
• Investors want a monthly package: monthly financials for investors and the board.
• A raise is coming: cleaning up your books before fundraising.
• An audit or review is on the table: audited financials for investors.
• Books are months behind, with no reconciliation history: catching up on overdue books, or bookkeeping to rebuild them.