INTERNATIONAL BUSINESS MACHINES CORP (IBM) stock intrinsic value fair value estimate & owner earnings analysis

IBM sells enterprise software (about $30.0 billion of 2025 revenue: Red Hat Linux and OpenShift, automation, data and AI tools, and the transaction-processing software that runs on its mainframes), consulting (about $21.1 billion) and infrastructure (about $15.7 billion, led by IBM Z mainframes, whose z17 generation launched in June 2025). Software is now the largest and most profitable part of the company, and most of it is recurring subscription and support revenue. How we measured earnings. We start from operating cash flow, remove working-capital swings, charge stock-based pay as a real cost (it rose from $1.1 billion in 2023 to $1.7 billion in 2025), and deduct the capital spending needed to maintain the business, including capitalized software. Large pension settlement charges in 2022 ($5.9 billion) and 2024 ($3.1 billion) did not consume cash and are not deducted. Changes in IBM's customer-financing receivables are treated as working capital, which strips out a $4.3 billion build in 2025 and a $5.3 billion run-off in 2020. Amortization of acquired intangibles and capitalized software ($2.7 billion in 2025) is added back as a non-cash charge; acquired technology does wear out, but IBM pays to renew its products through research spending that is already charged against these earnings, which is why the growth paths below stay modest and the bear case declines. Because we value the business before its lenders and then subtract what it owes, we add back cash interest of about $2.0 billion a year. Which years. IBM spun off its managed-infrastructure business (Kyndryl) in November 2021, so earlier years describe a different company. The 2022 to 2025 period also spans a full mainframe cycle, from the z16 launch in 2022 to the z17 launch in 2025. Cash flow before interest was $10.24, $10.90, $12.17 and $15.82 per share in those four years; we use the median, $11.54 per share (about $11.0 billion). Cash flow rose about 30% in 2025, but much of that came from the z17 product cycle and the receivables swing, so the base case assumes only 2% growth in its first year. Base case, $152.59 per share. Starting at $11.54, cash flow grows 2% a year for ten years. That rests on the existing subscription software base (Red Hat revenue grew 11% in 2024; software overall grew 9% in 2025 at constant currency, partly from acquisitions) growing at well under its demonstrated pace, while consulting and infrastructure are flat across the mainframe cycle and rising stock-based pay absorbs part of the gain. From year 11 to year 30 cash flow holds flat, supported by a mainframe franchise that has run core banking and transaction systems for six decades, then fades to zero over the following twenty years. The business is worth about $190.7 billion; it owes a net $45.3 billion, leaving about $145.4 billion for shareholders. Bear case, $65.09 per share. Cash flow starts at the 2022-2023 level of $10.50 per share, declines 2% a year for ten years and 3% a year for the next fifteen, then fades to zero by year 35. The named pressures are consulting, which is labor-based work that AI tools can displace and whose revenue fell 0.9% in 2024 and rose only 0.4% at constant currency in 2025; continued growth in stock-based pay; and a record of acquisitions that did not pay off, such as Watson Health, sold in 2022. The business is worth about $107.3 billion; less net debt of $45.3 billion leaves about $62.0 billion. Even in this case, cash flow covers today's interest bill throughout the decline: it bottoms at about $5.40 per share before the final fade, against interest of roughly $2.15 per share. Bull case, $214.96 per share. Cash flow starts at the four-year average of $12.30, which gives fuller weight to the strong 2025 year and allows for a contribution from the newly acquired HashiCorp and Confluent businesses, grows 4% a year for ten years as the software base keeps growing near its recent pace, holds flat to year 40, then fades over twenty years. The business is worth about $250.2 billion; less $45.3 billion leaves about $204.9 billion. Debt. At June 30, 2026 IBM owed about $62.0 billion ($56.2 billion long-term plus $5.8 billion short-term) and held $7.2 billion of cash, after spending about $10.5 billion in the first half of 2026, mainly to buy Confluent (announced at an enterprise value of about $11 billion). Much of the debt is long-dated, fixed-rate bonds with coupons well below today's rates: the company reports their fair value at $53.4 billion against $63.1 billion of principal. Because those low rates are locked in for years, we count the debt at about $9.6 billion less than face, giving net debt of about $45.3 billion, or $47.48 per share; without that adjustment it would be $57.59 per share. About $6.7 billion matures in the next twelve months and $4.4 to $6.0 billion in each of the following three years. IBM has refinanced maturities routinely, and its cash flow before interest covers interest more than five times. Operating leases, pension contributions and deferred revenue are not subtracted because their costs already run through cash flow. Marketable securities at June 30, 2026 (about $0.8 billion at the end of 2025) were not available and are left out. What growth we credited. Only continued growth of the existing subscription software base, at a rate below what it has demonstrated. We did not credit new AI revenue, management's growth and margin targets, or future acquisitions. IBM spent about $19 billion on acquisitions from 2022 to 2025 and another $10.5 billion in the first half of 2026, much of it financed with debt; buying growth this way is not a repeatable, self-funded process, so the cost of those deals is counted in the debt while Confluent's earnings appear only in the bull case. Change since our previous analysis. Our previous base value was $115.05. It is higher now chiefly because we now discount every company at the same 6% rate and express risk through the three cases rather than a higher rate (the earlier work used 8.5% to 11.5%), and because the debt now reflects its low locked-in interest rates. These are partly offset by more cautious growth (2% rather than 3% in the base case, 4% rather than 6% in the bull case) and by the extra borrowing and cash used to buy Confluent. What would make this wrong. Software growth stalling well below its recent record, the mainframe cycle failing to recur, AI eroding consulting faster than the bear case assumes, or further large debt-financed acquisitions that do not earn their cost.