Elon Musk’s AI lab promised employees a 420-dollar payment for handing over their personal tax data to train Grok ahead of the April 15 deadline. Two months on, Bloomberg reports, the money has not been paid.
Elon Musk’s xAI asked its own employees earlier this year to hand over their personal US tax returns as training data for Grok, Bloomberg reported on Monday, citing internal chats.
The company promised a $420 payment per submission, the recurring Musk in-joke now embedded in the tax-prep training pipeline of his AI lab. Two months after the data was collected, the payments still have not arrived.
The data-collection ask was timed against the 15 April US tax deadline. By March, Americans were already running tax-prep prompts through Claude and ChatGPT, and xAI was, on Bloomberg’s reading, trying to close the gap with a Grok feature that could handle returns.
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The internal chats Bloomberg reviewed show the offer was framed to staff as a way to improve the model with real, complex US tax filings, which are otherwise difficult to license at scale and impossible to scrape from the open web.
Two questions sit underneath the missing cheque. The first is what data-handling promises went with the original ask, given that employee tax returns contain salary, dependents, addresses, financial-account positions, and Social Security numbers.
The second is what the unpaid balance signals about an internal-controls operation that has spent four months being rebuilt around a corporate merger.
Context matters here. xAI was acquired by SpaceX on 2 February 2026 in an all-stock deal that valued SpaceX at $1tn and xAI at $250bn, the largest corporate merger by valuation in history. All eleven of xAI’s original co-founders had left by late March, a near-total exit that Bloomberg, the FT and others have tied to internal disagreements over Grok’s product direction and the integration with SpaceX and X.
Musk has since said publicly that the company was ‘not built right first time around’ and is being rebuilt from the foundations up under what he is now calling the SpaceXAI division.
The rebuild is the part the $420 story sits inside. xAI’s restructuring has, on the available reporting, included team-level lay-offs in May, the deprecation of the standalone xAI brand, and the absorption of the company into SpaceX’s organisational chart.
A finance-and-controls infrastructure that depends on existing payroll workflows being correctly mapped to a new corporate parent is, on the cleanest read of the available evidence, exactly the kind of system most likely to drop a small, non-standard, off-cycle payment between the cracks.
The missing $420 cheque is consistent with that pattern. It is not, on Bloomberg’s framing, evidence of intent.
The optics are, nevertheless, the part that travels. Musk has spent the past two years building a Twitter-era public persona around the 4/20 in-joke (the $420 incentive is a recognisable variant of the same family as Tesla’s 2018 going-private $420 share-price tweet) while also leading a private company whose stated valuation depends on running fast on the product side.
The same week Bloomberg published the unpaid cheque story, xAI was attempting to unveil its first coding agent to rival Anthropic and OpenAI’s Codex and was, by FT and Bloomberg accounts, trailing both Claude Code and Codex in internal benchmark testing. The missing payment is, in that frame, a small operational embarrassment inside a larger one.
On the data side, the regulatory backdrop is non-trivial. Grok is the subject of multiple open investigations in European jurisdictions, most prominently a French criminal investigation into mass-generation of non-consensual sexual imagery that Musk has refused to cooperate with, and the US Department of Justice has declined to assist with.
Any data-collection practice involving employees’ own personal financial records that has not been completed with the contractually promised compensation will be read by regulators in jurisdictions watching the company, as a separate input to questions they are already asking about xAI’s data hygiene.
xAI did not respond to Bloomberg’s request for comment. The amount per employee is small. The total cost of paying everyone who submitted, on any plausible employee-based estimate for an AI lab of xAI’s size, is in the low six figures. What the cheque costs in dollars is not the question the next several weeks will settle.
The question is what the unpaid amount says about the operational state of a company that has spent four months telling the market it is, with new urgency, capable of executing.
