The difference comes down to timing. Cash basis records income when you receive payment and expenses when you pay them. Accrual records income when you earn it and expenses when you incur them, regardless of when money actually changes hands.

For a simple example, you complete a $15,000 remodeling job in March and send the invoice. The customer pays in April. Under cash basis, that’s April revenue. Under accrual, it’s March revenue because that’s when you did the work.

The IRS lets most small businesses choose either method. If your average annual gross receipts are under $29 million, you generally have the option. Above that threshold, C-corporations must use accrual. There are some industry-specific rules, but most service businesses and contractors can pick the method that works better for them.

Cash basis is simpler. Fewer adjusting entries, easier to reconcile, and your profit roughly tracks your bank account. For a solo consultant or small service business without much in receivables or payables, cash works fine. You send an invoice, get paid a week later, and the timing difference doesn’t distort your picture much.

Accrual matters more when timing gaps are significant. Contractors deal with this constantly. You buy materials in January, do the work in February, invoice in March, and collect in April. Under cash basis, January shows a loss from materials expense with no revenue, and April shows a windfall from revenue with no matching expenses. Neither month reflects reality.

With accrual, the revenue and expenses land in the same period as the work. Your financial statements show what actually happened during that time frame. Job profitability reports make sense because costs get matched to the jobs that incurred them. If you’re tracking margins by project or phase, accrual gives you numbers you can trust.

Many business owners don’t realize you can use one method for taxes and another for internal management. Many contractors file taxes on cash basis, which often defers tax liability, while running their job costing reports on accrual to see true margins. Your bookkeeper maintains both views. This gives you the best of both approaches.

If you’re running multi-phase projects with progress billing or retainage, accrual accounting becomes almost necessary for meaningful reporting. Cash basis makes it hard to see whether a job actually made money until everything is collected and all bills are paid, which can be months after the work finished.

For MetroWest bookkeeping services that provide monthly financials, accrual also produces more consistent statements. Month-to-month comparisons become meaningful because you’re comparing actual activity, not just bank transactions that happened to clear.

The short answer is this. If you’re a simple service business with quick collection cycles and minimal inventory, cash basis keeps life easy. If you’re a contractor, run jobs with significant material costs, or need to understand profitability by project, accrual gives you the visibility to actually manage the business. When in doubt, talk to your bookkeeper and accountant about what each method would show you and whether the added complexity of accrual is worth it for your situation.