Accounting method is one of those business decisions that feels technical and dry until you realize it can shift tens of thousands of dollars in taxable income between years — and that changing it after the fact requires IRS permission. For most small businesses, the default is fine. For growing businesses with more complex revenue and expense timing, the choice deserves deliberate attention.

What Each Method Does

Cash basis accounting: You recognize income when you actually receive cash and deduct expenses when you actually pay them. If you send an invoice in December but get paid in January, the income shows up in January. If you receive a bill in December but pay it in January, the expense is in January.

Accrual basis accounting: You recognize income when it’s earned (when the right to receive it exists) and expenses when they’re incurred (when the obligation arises), regardless of when cash changes hands. The December invoice you sent gets recorded as December income, even if the check doesn’t arrive until February.

For tax purposes, the key difference is timing. Accrual accounting often pulls income forward and pushes expenses back compared to cash. Cash basis often gives more flexibility over when income and deductions land.

Who Can and Can’t Use Cash Basis

The IRS allows most small businesses to use the cash method, but not all. The threshold shifted significantly under the Tax Cuts and Jobs Act of 2017.

Businesses that can use cash basis:

– Sole proprietors, partnerships, and S-Corps with average annual gross receipts of $30 million or less (indexed for inflation — verify the current threshold, as it adjusts periodically)

– Most service-based businesses under the threshold

– Farming businesses (special rules apply)

Businesses generally required to use accrual:

– C-Corps with average annual gross receipts exceeding the $30 million threshold

– Businesses required to maintain inventory under the tax code

– Tax shelters (as defined under IRC Section 448)

A contractor who sells materials as part of a project may need to track inventory, which historically pushed businesses toward accrual for the inventory component. However, the same small business exceptions above often provide relief for businesses under the gross receipts threshold.

Tax Planning Opportunities Under Each Method

Cash basis gives you more control over the timing of income and expenses in a given year — and that control has real tax value.

Deferring income: If you’re near the end of a tax year and want to push some income into the next year, you can delay sending invoices or billing customers until January. Under cash basis, the income follows the cash, so later billing means later income recognition.

Accelerating deductions: If you want more deductions in the current year, you can prepay certain expenses before year-end — insurance premiums, subscriptions, supplies — as long as the prepaid benefit doesn’t extend more than 12 months into the future (the 12-month rule).

Accrual basis offers less tactical year-end flexibility, since income is recognized when earned regardless of cash receipt. But it can be advantageous for businesses that regularly have expenses incurred before they’re paid, allowing deductions to be claimed earlier.

Inventory Considerations

If your business sells products — not just services — inventory accounting becomes part of the equation. Businesses that maintain inventory cannot use pure cash basis for the inventory portion under the traditional rules. They must use accrual for inventory-related transactions.

However, the small business exceptions above have significantly expanded the number of businesses that can use simplified methods. Under the TCJA, businesses under the gross receipts threshold can often use cash basis and treat inventory as non-incidental materials and supplies — deducting inventory costs when paid rather than when the inventory is sold.

If your business sells physical products and you’re uncertain which rules apply, this is worth confirming with a tax professional, since the rules have changed and inventory accounting can materially affect your tax position.

Changing Your Accounting Method

Once you’ve filed a return using one accounting method, you cannot simply switch to another without IRS approval. A change in accounting method requires filing Form 3115 (Application for Change in Accounting Method) with your return.

In some cases, a method change results in a Section 481(a) adjustment — a catch-up amount that brings your books into line with the new method. This can result in either additional income (if switching from cash to accrual on a business with large receivables) or additional deductions (if switching the other way).

The IRS has automatic consent procedures for many common method changes, meaning you don’t need to wait for approval — you file the form, receive automatic consent, and take the adjustment over one to four years depending on the type of change.

Frequently Asked Questions

Q: Does my accounting software’s method match my tax method?

A: Not necessarily. QuickBooks and similar software default to accrual for financial reporting purposes. Your books might show accrual while your tax return uses cash. Work with your accountant to make sure there’s clarity about which method applies to your tax filings.

Q: Can I use cash basis for some income and accrual for others?

A: In limited circumstances, a hybrid method is permitted. For example, some businesses use accrual for inventory and cash for everything else. But you can’t mix methods arbitrarily — the hybrid must clearly reflect income.

Q: If I use cash basis, can I deduct a large payment made at year-end by credit card?

A: Yes. Under the cash method, a payment by credit card is considered paid when the charge is made, not when you pay the credit card bill. So a large expense charged in December is deductible in December even if you pay the card in January.

Q: Which method is better for my business?

A: It depends on your industry, your cash flow patterns, and your tax planning goals. Service businesses with consistent cash collection often prefer cash basis for its simplicity and flexibility. Businesses with large receivables or long project cycles often find accrual reflects their economics more accurately. The right answer requires running your numbers.

Your accounting method affects when income is taxed and when deductions are taken — sometimes by months, sometimes by years. It’s worth getting this right from the start and reviewing it as your business grows.

If you’d like to apply this to your situation, the team at Molen & Associates is here to help. Schedule a consultation at molentax.com.