One of the first decisions you make in setting up your startup’s books — often without realizing it — is choosing an accounting method. Most founders default to cash basis accounting because it is simpler. But as your startup grows, accrual accounting becomes necessary, and making the switch later is more complicated than setting it up correctly from the start.
Here is everything you need to know about both methods, how they affect your financial statements, and which one is right for your business.
Cash Basis Accounting — The Simple Version
Cash basis accounting records revenue when cash is received and expenses when cash is paid. It tracks the actual movement of money in and out of your bank account — nothing more, nothing less.
Example: You complete a $5,000 project in March and invoice your client. They pay in April. Under cash basis accounting, you record $5,000 in revenue in April — when the cash arrives — not in March when you did the work.
Advantages:
- Simple to understand and maintain
- Closely mirrors your actual bank balance
- Easier for early-stage founders to manage without an accountant
Disadvantages:
- Does not reflect the true financial health of the business at any given moment
- Can make a slow-paying month look unprofitable even when work was completed
- Not accepted by investors or lenders who need GAAP-compliant financials
- Required to switch if revenue exceeds $30 million (IRS requirement)
Cash basis is appropriate for very early-stage startups with simple finances, low transaction volume, and no outside investors. For most founders, it is the starting point — not the permanent solution.
Accrual Basis Accounting — The Professional Standard
Accrual basis accounting records revenue when it is earned (when you deliver the product or service) and expenses when they are incurred (when you receive the bill), regardless of when cash actually changes hands.
Example: Same $5,000 project. Under accrual accounting, you record $5,000 in revenue in March — when the work was completed and the invoice was issued — even though the cash arrives in April.
Advantages:
- Gives a true picture of business performance in any given period
- Required for GAAP compliance — necessary for investor reporting and audits
- Better matches revenue with the expenses that generated it
- Required by the IRS for businesses with over $30 million in gross receipts
Disadvantages:
- More complex to maintain correctly
- Your P&L can show strong profit while your bank account looks empty — this is the exact dynamic explained in our cash flow vs profit guide
Which Method Does the IRS Require?
The IRS allows most small businesses to use either cash or accrual basis, with some important exceptions:
- Businesses with average annual gross receipts over $30 million (over a 3-year period) must use accrual basis
- C-Corporations with over $5 million in annual gross receipts generally must use accrual basis
- Businesses that carry inventory are typically required to use accrual for inventory-related transactions
If you are unsure which rule applies to you, your CPA can advise based on your specific entity type and revenue level.
When Should a Startup Switch to Accrual?
The most common trigger for switching is outside investment. When you raise a seed round or Series A, investors and their accountants will expect GAAP-compliant financials — which means accrual basis. Your year-end financial package will need to be prepared on accrual basis before your first investor audit.
Other common triggers include:
- Applying for a business loan or line of credit
- Bringing on a co-founder or issuing equity to employees
- Revenue growing past $1–2 million annually
- Hiring a CFO or fractional CFO
Switching from cash to accrual mid-year requires restating your prior financial records, which is a specialized task. Our historical cleanup service handles exactly these kinds of transitions — bringing your books to a clean accrual-basis state so you are ready for investor scrutiny.
How It Affects Your Financial Statements
The accounting method you choose affects how your Profit & Loss statement and Balance Sheet look in any given month:
Under cash basis, your P&L reflects actual cash in and out. Your balance sheet will not include accounts receivable (unpaid invoices) or accounts payable (unpaid bills) because those only matter when cash moves.
Under accrual basis, your P&L reflects earned revenue and incurred expenses — which may be very different from your cash position. Your balance sheet will include accounts receivable and accounts payable, giving a fuller picture of what you are owed and what you owe.
This distinction is why profitable businesses can experience cash crunches — and why smart founders track both their P&L and their cash flow statement every month.
Which Method Does Startup Books Use?
At Startup Books, we set up new clients on accrual basis by default for any business that expects to raise capital or grow beyond the early bootstrapped stage. For very early-stage pre-revenue startups, we discuss the right approach during onboarding based on your specific goals.
If you are currently on cash basis and need to switch, or if you are not sure which method your books are using, schedule a free consultation and we will assess your situation and explain your options clearly.