IREN wrote off $638.8 million in mining hardware to make room for AI customers. It still made 82% of its money mining Bitcoin.
That’s the tension sitting in the middle of the company’s fiscal 2026 results, filed Aug. 27. Bitcoin mining generated $578.2 million of IREN’s $707 million in annual revenue, or about 81.8%. AI Cloud Services contributed $128.8 million.
The story IREN tells is one of a company in transition. The numbers say the transition hasn’t happened yet.
The impairment isn’t cash, but it isn’t nothing
The $638.8 million non-cash impairment is tied primarily to decommissioning miners as data center sites were converted for AI workloads. IREN also reported a $702.6 million net loss, affected by the impairment and other items.
No $638.8 million left the building. What the charge does is put an accounting value on assets retired before the replacement business had fully entered service. You scrap the thing that pays you before the thing that will pay you is switched on.
A $4 billion target against $1 billion of actual operations
As of Aug. 26, IREN had $1 billion of operating annualized run-rate revenue, or ARR, against $4 billion of contracted ARR for its 2026 capacity. The company targets the larger run rate to be operational by Dec. 31.
Four times the current operating level, in roughly four months.
It’s worth understanding how that $4 billion gets calculated. IREN derives ARR from contracted GPU pricing multiplied by a full year of hours, including storage and related services. It’s an operating measure, not GAAP revenue, and IREN warns that recognized revenue may be materially lower.
Closing the gap depends on physical infrastructure being delivered and accepted, plus the company’s own utilization and pricing assumptions holding up.
Revenue starts at the end of a long checklist
IREN’s Form 10-K spells out the sequence. Revenue generally starts only after data centers are built and energized, equipment is installed and commissioned, performance testing is complete and customers accept the capacity.
Miss a step and the money waits while the bills don’t. Delays can postpone revenue while financing and operating costs continue, and can trigger delay or service credits.
Microsoft accepted one horizon out of four
The delivery schedule is staged. Microsoft accepted Horizon 1 in August. Horizons 2 through 4 were targeted for phased delivery in calendar Q4 2026, with contractual grace periods extending into the beginning of calendar Q2 2027.
Those grace periods are the part worth watching. They exist because everyone involved understands the schedule can slip.
380MW that still hashes
At June 30, IREN still had installed Bitcoin mining capacity of about 23.2 EH/s across roughly 380MW. The company aimed to substantially complete the transition of that data center capacity toward AI Cloud Services by year-end.
So the same megawatts that produced $578.2 million of mining revenue are meant to be running someone else’s GPUs within months.
The financing carries its own clock
Delay costs money directly. IREN raised GPU financing to support the Microsoft contract through a delayed-draw loan priced at one-month SOFR plus 2.25% and senior notes at 5.96%, with tranches subject to conditions.
A separate Mackenzie financing of up to $2.4 billion carries a 9% fixed rate and matures 30 months after each relevant staged funding date. That 9% accrues whether or not a customer has accepted anything.
Two names, most of the book
Microsoft and NVIDIA together represented a substantial majority of contracted revenue, according to IREN. New customers diversify the roster, but acceptance, performance and counterparty risks remain concentrated.
Trading commodity Bitcoin revenue for contracted AI revenue swaps price risk for counterparty risk. Neither is free.
What to actually watch
IREN has contracts that could replace the mining business on a run-rate basis. The filing does not show that replacement as completed.
The next proof isn’t another ARR figure. It’s customer acceptance of the remaining deployments and the GAAP AI revenue they begin to produce. Until Horizons 2 through 4 clear commissioning and acceptance, IREN is a Bitcoin miner with a large AI order book and a $638.8 million hole where its old machines used to be.
Bitcoin is +0.67% over the past 24 hours and currently sits at rank #1 by market cap.
