Nvidia just posted another blowout quarter, and the stock popped on the news.

But tucked inside the filing were a few numbers that have analysts asking questions. The company is booking more sales than ever, yet it is also waiting on a lot more cash from customers.

The Bill Is Growing Faster Than the Business

Here is the headline number to wrap your head around: net accounts receivable - the money customers owe Nvidia for chips they have already taken - grew roughly 63% from January to July, climbing to $63.1 billion from $38.5 billion.

That is a massive jump in a six-month window. According to Bank of America, the figure might reach $113 billion by 2028 and $147 billion by 2029, representing a 107% increase over the $71 billion estimate for January 2027. Morgan Stanley is even more aggressive, seeing accounts receivable at $171 billion by January 2029, up 117% from $78.6 billion in January 2027.

The customer concentration is also tightening. The filing shows 70% of that receivables total now comes from just five customers, mostly cloud providers. A year earlier, 56% came from three customers. Fewer customers owing more money is a risk worth watching, even if those customers are giants.

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This trend raises a fundamental question about the durability of Nvidia's growth. If its largest customers - the hyperscale cloud providers - are already straining to pay for their AI infrastructure, the company may eventually need to adjust its terms or face a slowdown. However, analysts note that these receivables are still a small fraction of Nvidia's total revenue, which is expected to exceed $200 billion this fiscal year. The real risk is not that customers won't pay, but that they might pull back on future orders if their own cash flows tighten.

The Commitments Are Getting Enormous

Nvidia is not just waiting on payments - it is also promising a lot of cash out the door. Commitments to customers and suppliers doubled to $279 billion in Q2 from $119 billion in Q1, driven largely by memory chip requirements, according to Citi.

Goldman Sachs flagged those commitments alongside Nvidia's $500 billion financing deal with private equity firms announced earlier this month.

Gil Luria at D.A. Davidson put it plainly: "It's worth keeping an eye on," adding, "We have to pay close attention, because the numbers are so big and they're making really big commitments way out into the future."

The bull case for Nvidia has always been that AI spending is unstoppable, and the company is the toll booth. That story is still intact for fiscal 2027. But when a company's unpaid bills grow faster than its revenue, it is worth asking whether the toll booth is starting to accept promissory notes instead of cash. For investors, the question is not whether AI is real - it is whether Nvidia's customers can keep paying for all these chips at this pace.