Two businesses with identical bank balances can report wildly different profits in the same month — not because one is doing something wrong, but because they're using different accounting methods. Choosing between cash and accrual accounting is one of the first real decisions a small business owner has to make, and it affects everything from your taxes to how confidently you can read your own financial statements.
The core difference in one sentence
Cash accounting records income and expenses when money actually moves. Accrual accounting records them when the transaction happens — an invoice is sent, a bill is received — regardless of when cash changes hands.
| Scenario | Cash method | Accrual method |
|---|---|---|
| You invoice a client for $5,000 today, they pay in 30 days | Recorded next month, when paid | Recorded today, as revenue |
| You receive a $2,000 supplier bill due in 30 days | Recorded next month, when paid | Recorded today, as an expense |
| Reflects your bank balance | Closely | Not directly |
| Reflects true business performance | Can be misleading | More accurate |
Cash accounting: simple, but can hide the real picture
Cash-basis books are easy to understand — the numbers roughly track what's in your bank account. That simplicity is exactly why most sole proprietors, freelancers and very small service businesses start here. The downside: cash accounting can make a struggling business look healthy (a big deposit lands right before month-end) or a thriving one look weak (a slow-paying client delays revenue you've already earned). If you're trying to understand whether your business is actually profitable, cash accounting alone won't give you a reliable answer.
Accrual accounting: more accurate, more work
Accrual accounting matches revenue to the period it was actually earned and expenses to the period they were actually incurred — this is called the matching principle, and it's the foundation of standard financial reporting (GAAP). It requires tracking accounts receivable (money owed to you) and accounts payable (money you owe), which means more bookkeeping discipline, but it gives you a much clearer picture of actual performance — essential once you have inventory, extend credit to customers, or want financial statements a lender or investor will trust. It also relies on solid accounts payable and receivable tracking to work properly.
Quick test: if you could look at last month's profit number and immediately explain, in one sentence, why it's higher or lower than the month before — you understand your accounting method well enough to trust the number. If you can't, it's worth a second look at how your books are set up.
The tax angle
In the US, the IRS allows most small businesses to choose either method, with some exceptions:
- Inventory-based businesses generally must use accrual accounting for purchases and sales of merchandise, even if they use cash accounting elsewhere, once they exceed certain average gross receipts thresholds.
- C-corporations above a gross-receipts threshold are generally required to use accrual accounting.
- Sole proprietors, freelancers and most service businesses below the thresholds can generally choose the method that suits them, and many start with cash accounting for its simplicity.
Thresholds and rules change periodically, so confirm current figures with a tax professional or the IRS before deciding — this isn't something to guess on.
Cash flow: the piece both methods can miss
Here's a trap many owners fall into: accrual accounting can show a healthy profit while the bank account is nearly empty, because revenue you've recorded hasn't been collected yet. Whichever accounting method you use, you still need a separate eye on your actual cash position — the same discipline covered in our monthly bookkeeping checklist.
Can you switch later?
Yes, but it isn't as simple as flipping a setting in your accounting software. Changing your accounting method for tax purposes generally requires filing IRS Form 3115 and getting consent, and it can affect the timing of income and deductions in the year of the change. Most businesses that switch do so when they cross a growth milestone — adding inventory, taking on investors, or simply outgrowing the limitations of cash-basis reporting — and get help from a bookkeeper or accountant to do it cleanly.
Which one should you use?
| Choose cash accounting if... | Choose accrual accounting if... |
|---|---|
| You're a freelancer, consultant or very small service business | You carry inventory or extend credit to customers |
| You have no inventory and simple, short-cycle transactions | You want financial statements lenders/investors will accept |
| You want the simplest possible books | You need an accurate month-to-month read on profitability |
| You're below the relevant IRS thresholds and prefer simplicity | You're approaching or above those thresholds |
Many growing businesses eventually keep accrual-basis books for management decisions while still qualifying for cash-basis tax treatment where allowed — the two aren't mutually exclusive. If you're unsure which setup fits your business, that's exactly the kind of decision worth getting a second opinion on before your books get built around the wrong foundation. Get in touch and we'll help you figure out what makes sense.
Frequently Asked Questions
What is the main difference between cash and accrual accounting?
Cash accounting records income and expenses when money actually changes hands. Accrual accounting records them when the transaction occurs — when you invoice or receive a bill — regardless of when payment happens. Accrual gives a more accurate picture of performance; cash accounting is simpler and tracks your bank balance more closely.
Which accounting method does the IRS require?
Most small businesses without inventory can choose either method. Businesses with inventory generally must use accrual accounting for purchases and sales once they exceed certain gross-receipts thresholds, and larger C-corporations are generally required to use accrual accounting. Thresholds change periodically, so confirm current rules with a tax professional.
Can I switch from cash to accrual accounting later?
Yes, but it typically requires filing IRS Form 3115 and getting consent, since it can shift the timing of income and deductions in the year of the change. Most businesses make the switch with help from a bookkeeper or accountant to avoid errors.
This article is general information, not personalised tax, legal or accounting advice. Rules and thresholds change — confirm current-year figures with the IRS or a qualified professional before acting. Ask Accounts Buddy if you'd like help applying any of this to your business.