7 Timing Rules That Decide Which Tax Year an Expense Lands In

7 Timing Rules That Decide Which Tax Year an Expense Lands In

Every December, someone spends real money for a tax reason and gets the wrong year.

They prepay eighteen months of insurance in December expecting a full deduction. They accrue a bonus that is not actually owed yet. They book a December invoice for work starting in February. The money left. The deduction did not arrive when they thought.

Which tax year an expense lands in is not decided by the invoice date, and it is not decided by when the money left your account either. It is decided by seven rules that stack in a specific order. Here they are, roughly in the order they apply to you.

1. Your Accounting Method Decides Which Tax Year an Expense Lands In

Before any timing rule applies, one thing has to be settled: whether you are on the cash method or the accrual method, because they answer this question differently for the same transaction.

Whether you get to choose is largely a size test. For tax years beginning in 2026, a corporation or partnership meets the section 448(c) gross receipts test if average annual gross receipts for the three prior tax years do not exceed $32,000,000. That figure was $31 million for 2025, and it comes from a $25 million base set in the 2017 law, indexed annually.

Clear that test and a lot opens up, including the cash method itself and relief from some capitalization rules. Fail it and you are on accrual, and rules four through seven below become the whole game.

It is a rolling three-year average, which means businesses drift across the line in both directions. A single enormous year can push you over for the following year, and that is a planning event, not a surprise to discover on a return.

Here is the same December, three transactions, two methods:

December transaction	Cash method	Accrual method
Charge $14,000 of supplies to a credit card on Dec 28, pay the card in January	Generally deductible in December, when the card is charged	Generally deductible in December, since the supplies were received
Receive an invoice on Dec 20 for consulting that starts in February	Not deductible, nothing paid	Not deductible, economic performance has not occurred
Consultant finishes work Dec 18, invoices you on Jan 22	Not deductible until paid in January	Generally deductible in December, when performance occurred

Same three facts, three different answers. That is the whole reason this article exists.

Changing methods is not a decision you make on the return either. It generally requires an accounting method change, filed on Form 3115, which is its own project with its own timing. Drifting over the section 448(c) line is a nine-month conversation, not an April one.

2. Cash Basis: A Credit Card Charge Is Paid When You Swipe It

For a cash-method taxpayer, a credit card charge is a payment in the year of the charge, not the year you pay the statement.

This is the single most useful timing lever a small business has, and almost nobody uses it deliberately. Charge $14,000 of equipment and supplies on December 28, pay the card in January, and the deduction is generally in the December year. You have borrowed from the bank, not from the government, and the expense is fixed the moment the merchant runs the card.

A mailed check works similarly. Delivery or mailing generally controls, so a check written and mailed on December 30 is usually a current-year payment even though it clears in January. Writing the check and leaving it in a drawer is not.

The limit worth naming: this accelerates a deduction into a year, it does not create one. If the expense is not otherwise deductible, or if it has to be capitalized, the timing of payment does not fix that.

3. The 12-Month Rule Is Why Prepaying 18 Months Does Not Work

There is a real safe harbor for prepaid expenses, and it has an edge people walk straight off.

Under Reg. 1.263(a)-4(f), you generally do not have to capitalize a prepaid amount if the right or benefit does not extend beyond the earlier of twelve months after the benefit begins, or the end of the tax year following the year of payment.

So a twelve-month insurance policy prepaid in December is usually fine. An eighteen-month policy is not, and a twelve-month policy that starts in June of the following year can fail the second half of the test even though it clears the first half. Both conditions have to hold.

This is the rule that turns a well-intentioned December purchase into a capitalized asset amortized over the term. The fix is boring and effective: buy twelve months, and start it soon.

4. Accrual Basis: The All-Events Test Plus Economic Performance

On the accrual method, an expense is deductible when all events have occurred to establish the liability, the amount is determinable with reasonable accuracy, and economic performance has occurred.

The third piece is the one that gets skipped. Economic performance under section 461(h) generally means the services or property you are paying for have actually been provided. A signed contract and an invoice are not economic performance.

This is why booking a December invoice for a February engagement does not produce a December deduction, no matter how real the commitment is or how firmly the vendor invoiced for it. The liability may be fixed. The performance has not happened.

It cuts the other way too, and favorably: work performed in December that has not been invoiced yet is generally accruable. Accrual businesses routinely miss deductions by waiting for paperwork that has nothing to do with the test.

5. The Recurring Item Exception and Its 8.5-Month Window

There is a specific relief valve from the economic performance requirement, and it is narrower than the shorthand version suggests.

Under the recurring item exception, an accrual taxpayer can treat economic performance as occurring in the current year if the all-events test is otherwise met, economic performance occurs within the shorter of a reasonable period or 8.5 months after year end, the item is recurring in nature and consistently treated that way, and the item is either not material or the earlier accrual results in better matching against income.

Read that as four conditions, not one. "We will pay it by mid-September" satisfies exactly one of them.

Where it genuinely works is repeat, predictable items: utilities, service contracts, certain taxes, insurance handled consistently year over year. Where it fails is a one-off. A large unusual liability, accrued once, is neither recurring nor consistently treated, and the exception does not reach it.

6. Related-Party Accruals Change Which Tax Year an Expense Lands In

If you accrue an expense payable to a related person on the cash method, section 267(a)(2) generally defers your deduction until the amount is includible in that person's income.

This quietly kills a lot of year-end entries. Accrued rent to an owner who holds the building personally. Accrued management fees to an affiliated entity. Accrued interest on a shareholder loan. The entry books cleanly, the financial statements look right, and the deduction sits in the following year alongside the recipient's income.

The result is a matching rule rather than a penalty. You are not losing the deduction, you are losing the year, which is only a problem if you were counting on the year. Pay it before year end and the issue generally goes away.

7. Accrued Bonuses and the Part About Still Being Employed

Year-end bonuses have their own timing rule and their own trap.

The rule most people know: an accrued bonus generally has to be paid within 2.5 months after year end, or it falls under the deferred compensation rules and the deduction moves to the year of payment. For a calendar-year business that means March 15.

The trap is upstream of the deadline. If the bonus plan says an employee forfeits the bonus by leaving before the payment date, then at year end the liability is not fixed. Nobody knows who is still going to be there. That contingency can fail the all-events test on its own, and paying by March 15 does not cure it.

The fix is in the plan language, not the payment date, and it has to be in place before year end. It is also worth asking whether the forfeiture provision is doing something you want, because removing it has real cost outside of tax.

If your December decisions are made off a close that finishes in the third week of January, none of the above is usable in time. See 7 Steps to a Month-End Close That Finishes in Five Business Days. And for the specific case of small equipment purchases, What Is the De Minimis Safe Harbor Election for Equipment Purchases covers the election that handles most of them.

Who Actually Operates This

Timing rules are useless as knowledge. They are only worth anything if someone is watching the ledger in November with the rules in mind.

Bookkeeper360 is a New York, New York accounting, bookkeeping, and fractional CFO firm founded in 2012, now 14 years in business with a team of 80, serving clients nationwide. Its published service lines include bookkeeping, accounts payable and receivable, payroll, sales tax, bank reconciliation, budgeting and forecasting, cash flow management, and advisory.

Bookkeeper360 has a small number of verified client reviews on its Sam's List profile, below the level where a count tells you anything useful, so we are not citing one here. The relevant detail is scale and cadence: an 80-person team with a dedicated staff assignment is the kind of operation that can actually close a month in time for a December decision to be made in December rather than reconstructed in April.

The honest constraints, and they matter for this specific topic. A bookkeeping and advisory firm executes the accounting method its client's tax preparer chose. It generally does not make the section 448 method change, file the accounting-method election, or draft the bonus plan language, and those are the three places the real money moves in this article. Ask directly who owns each of those decisions in your setup. The profile also lists no CPA or Enrolled Agent credential and publishes minimums of $250,000 in income and $500,000 in revenue, so confirm both fit before you engage.

To compare firms, browse the Sam's List accountant directory and read what actual clients wrote before you get on a call.

Frequently Asked Questions

What is the gross receipts threshold for using the cash method in 2026? For tax years beginning in 2026, a corporation or partnership meets the section 448(c) gross receipts test if its average annual gross receipts for the three prior tax years do not exceed $32,000,000. The 2025 figure was $31 million. Because it is a rolling three-year average, a business can move above or below the threshold from year to year.

If I charge an expense to a credit card in December, which year is it deductible? For a cash-method taxpayer, generally the year of the charge, not the year you pay the card balance. The charge itself is treated as payment. This only accelerates a deduction that already exists, so it does not help with amounts that must be capitalized or that are not otherwise deductible.

Can I deduct a prepaid expense that covers more than 12 months? Generally not in full. The safe harbor in Reg. 1.263(a)-4(f) applies when the benefit does not extend beyond the earlier of 12 months after the benefit begins, or the end of the tax year following the year of payment. Both conditions must be satisfied, so an 18-month prepayment, or a 12-month term that starts late in the following year, generally has to be capitalized and amortized.

Is a bonus accrued in December deductible that year? Only if the liability is fixed at year end and the bonus is generally paid within 2.5 months after year end. If the plan lets an employee forfeit the bonus by leaving before the payment date, the liability is usually not fixed at year end, and paying by the deadline does not fix that. The plan language has to be settled before year end.

---

About the author: Kimberly Green is the cofounder of Sam's List, where business owners and high earners find vetted CPAs, financial advisors, and fractional CFOs. She's met one-on-one with 400+ financial professionals and writes from the real data behind thousands of client-advisor matches. Ask her anything about finding an accountant - she's heard it all, including the questions people are afraid to ask.