Profit is an accounting concept. Cash flow is a survival metric. Both matter, but only one determines whether you’re still in business next month.

A business can show a profit on the income statement and still not have enough cash in the bank to cover payroll. This happens more often than people realize, especially with small businesses that invoice customers and wait 30, 60, or even 90 days to get paid. The work is done, the revenue is recorded, and the profit looks great on paper. But the cash hasn’t arrived yet, and your bills don’t wait.

Here’s a simple example. A contractor finishes a $40,000 project in March. Materials cost $15,000, labor cost $12,000, and overhead was $5,000. That’s $8,000 in profit. But the client doesn’t pay until May. Meanwhile, the contractor still had to pay suppliers and crew throughout March and April. On paper, the business made money. In reality, the owner is scrambling to cover expenses for two months before a dollar comes in from that job.

This timing gap is where small businesses get into trouble. Larger companies have credit lines and cash reserves to absorb the difference. Small businesses often don’t. One slow-paying client or one unexpected expense can create a crisis even when the business is technically profitable.

Profit also doesn’t account for things that consume cash but don’t show up as expenses on your income statement. Loan principal payments reduce your bank balance but aren’t expenses. Buying equipment uses cash but gets depreciated over years. Building up inventory ties up money that won’t come back until you sell the product. Your profit and loss statement won’t show any of these cash drains. The reverse is true too. Depreciation is an expense that reduces profit but doesn’t use any cash. So your actual cash position can be better or worse than your profit number suggests depending on the situation.

What this means practically is that you need to watch both numbers but prioritize cash flow in your day-to-day decisions. Invoice quickly and follow up on late payments. Negotiate payment terms with vendors that give you breathing room. Build a cash reserve so one delayed payment doesn’t put you in a bind. Working with a bookkeeper in Chandler who understands this distinction helps because clean books give you accurate profit numbers, but the real value is being able to see where your cash stands at any given moment.

Taking it a step further, cash flow forecasting projects your cash position weeks or months into the future so you can plan ahead instead of reacting to shortfalls. You can see that a slow month is coming and tighten spending now, or confirm that you have enough runway to take on a bigger project that won’t pay out for a while.

Profit tells you the business model is sound. Cash flow tells you the business is alive. If you have to pick one to watch closely, watch your cash.