Cash vs accrual accounting : which method should your startup use?

Cash accounting records income when money arrives and expenses when they are paid; accrual accounting records income when it is earned and expenses when they are incurred, regardless of when cash moves. Most early-stage startups can legally choose either, because the IRS only forces the accrual method once a business exceeds the gross receipts test under Section 448, with the IRS-adjusted threshold set at $32 million in average annual gross receipts for tax years beginning in 2026, up from $31 million in 2025. The harder question is not what you are allowed to do, but which method actually serves a startup that intends to raise money. This guide answers both.

What is cash accounting?

Under the cash method, you record income only when you actually or constructively receive it, and you record an expense only when you pay it. If you invoice a customer in December but the payment lands in January, that revenue belongs to January. It is the simplest approach and the default for many freelancers, sole proprietors, and early service businesses, because it tracks the bank balance closely and gives a clear view of cash on hand.

The limitation is that cash accounting can distort the picture of a growing business. A month with large unpaid invoices can look weak, and a month where a big client finally pays can look artificially strong, even when the underlying work was spread evenly.

What is accrual accounting?

The accrual method of accounting, as defined in IRS Publication 538, records revenue when it is earned and expenses when they are incurred, independent of payment timing. You book a sale when you deliver the product or complete the service, even if the customer will not pay for 60 days, and you book an expense when you receive the benefit, even if you have not yet paid the bill. The purpose of accrual basis accounting is to match income and the expenses that generated it in the same period, which is why it gives a truer view of how a business is actually performing.

That matching is the reason accrual is the foundation of GAAP. For a startup with deferred revenue, unpaid invoices, or subscription billing, it is the only method that reflects economic reality rather than the rhythm of the bank account.

What are the core differences between cash and accrual accounting?

Is there a hybrid accounting method?

Yes. IRS Publication 538 permits a combination method: accrual for the purchase and sale of inventory, cash for everything else, as long as the combination is applied consistently and clearly reflects income. This is common for a startup with a small physical product line alongside a services or subscription business; the inventory-linked activity is tracked on accrual because inventory accounting requires it, while simpler operating expenses and service income stay on cash. A hybrid approach is not a workaround for the gross receipts threshold; it is a recognised method in its own right, and it still needs to be adopted consistently and documented the same way a pure method would be.

Which method does the IRS allow?

Most small startups can choose. Under the Section 448 gross receipts test, a corporation or partnership can generally use the cash method as long as its average annual gross receipts for the three prior tax years stay under the inflation-indexed threshold. The base figure is $25 million, set by the 2017 Tax Cuts and Jobs Act, and it is adjusted for inflation each year: $30 million for 2024, $31 million for 2025, and $32 million for 2026. Businesses above that line, along with most C corporations and any business required to carry inventory under older rules, must use an accrual method. The threshold is averaged over three years and adjusted annually, so a fast-growing company should watch it before it becomes a forced change.

Which method should a startup actually choose?

If you intend to raise institutional capital, the practical answer is accrual, even while you are small enough to qualify for cash. Investors and lenders expect GAAP financials, and GAAP is built on accrual, so presenting cash-basis books during diligence usually means restating them under time pressure. Cash still has a place: a pre-revenue company with simple finances and no near-term raise can reasonably start on cash, then move deliberately to accrual as billing grows complex or a round approaches, rather than discovering mid-diligence that its books do not speak the language investors read.

Should your tax return and your books use the same method?

No, and this is where founders most often overcomplicate the decision. The method on your tax return and the method behind your management books serve different audiences and can legitimately diverge. Many venture-backed startups that qualify for the cash method file their tax return on cash, which can defer taxable income, while maintaining GAAP-basis accrual books for board reporting, investor updates, and the financial model. The tax return reconciles book income to taxable income as a matter of course; divergence between the two is expected, not a red flag, as long as both are prepared correctly and consistently. What matters is that the books an investor sees are accrual, regardless of which method the tax return uses.

How do two similar startups end up on different methods?

The right method depends on the business model, not just the size. Two companies at similar revenue can land in different places.

What do founders get wrong about choosing an accounting method?

The most common mistake is not monitoring the trailing three-year gross receipts average until the year it is already breached. A company that only checks its status annually, rather than tracking the rolling average as it grows, ends up converting to accrual under a compressed timeline rather than on a schedule it controlled.

A second error is treating cash-basis books as good enough right up until a fundraise begins. Twelve to twenty-four months of historical financials typically need to be restated to accrual before a data room opens, and that restatement, done under diligence pressure, is where errors and timeline delays are most likely to surface.

Third: assuming that any business under the gross receipts threshold can use pure cash accounting regardless of what it sells. A company that carries inventory generally cannot use a pure cash method for the inventory-linked side of the business regardless of size; it needs accrual or a hybrid method for that component specifically. Founders who miss this distinction sometimes file on a basis that is not actually available to them.

How do you switch methods later?

You choose your method on your first tax return, and no advance approval is needed for that initial choice. Changing it afterwards is a formal process: you must file Form 3115, Application for Change in Accounting Method, and obtain IRS consent. Some changes are automatic and some require advance consent, but either way the method is sticky, which is why the first decision deserves more thought than founders usually give it.

Frequently asked questions

What's the takeaway for a startup choosing between cash and accrual?

Cash vs accrual is a timing choice with real consequences. Cash is simpler and fine for a small, pre-revenue company with no near-term raise. Accrual is what GAAP requires and what investors and lenders expect, so any startup on a venture path is better served adopting it early rather than converting under diligence pressure. Decide deliberately on your first return, watch the gross receipts threshold as you grow, and pick the method that matches where the company is going, not just where it is today.

Explore related Fintera content

• Accounting for Startups, the broader setup questions this guide builds on, including chart of accounts and financial statement structure
• How to Choose an Outsourced Accounting Provider, the five things to check once you have decided on accrual, including whether a provider actually delivers it by default