How Much Can Micron’s New Fabs Earn?
A project-by-project estimate of Micron’s expansion spending, mature cash generation, and investment returns.
Micron’s modeled expansion pipeline requires about $122B of net investment and could produce roughly $51B of mature annual cash income, for an aggregate base IRR near 31%.
The company does not appear meaningfully constrained by access to capital. The more important question is whether memory demand can absorb each new fab without additional supply pushing prices and returns down.
Modeled project economics
Project investment and income are estimates rather than Micron guidance. Capital milestones show the first fiscal year in which cumulative project cash generation reaches each multiple of net investment.
| Project | Net investment | First output | Mature annual cash income | 1× capital | 2× capital | 3× capital | 5× capital | Base IRR | Downside IRR |
|---|---|---|---|---|---|---|---|---|---|
| Tongluo Existing P5 | $7.2B | FY2028 | $4.5B | FY2031 | FY2033 | FY2034 | FY2037 | 39% | 16% |
| Tongluo Second Cleanroom | $13.6B | FY2030E | $5.5B | FY2034 | FY2036 | FY2039 | FY2044 | 21% | 6% |
| Idaho Fab 1 | $9.8B | FY2027 | $6.0B | FY2032 | FY2034 | FY2035 | FY2039 | 30% | 12% |
| Idaho Fab 2 | $15.6B | FY2029 | $7.5B | FY2033 | FY2035 | FY2037 | FY2041 | 31% | 11% |
| New York Fab 1 | $18.2B | FY2030 | $7.5B | FY2034 | FY2037 | FY2039 | FY2044 | 24% | 6% |
| Singapore NAND Fab | $19.2B | FY2029 | $3.5B | FY2036 | FY2042 | FY2047 | FY2058 | 10% | −7% |
| Hiroshima Modernization | $4.2B | FY2027E | $2.5B | FY2030 | FY2032 | FY2033 | FY2037 | 38% | 15% |
| Manassas Modernization | $1.6B | FY2026 | $0.6B | FY2030 | FY2032 | FY2035 | FY2040 | 27% | 11% |
| Singapore HBM Packaging | $5.6B | FY2027 | $2.5B | FY2031 | FY2033 | FY2035 | FY2040 | 30% | 13% |
| India Assembly and Test | $0.8B | FY2026 | $0.3B | FY2031 | FY2034 | FY2037 | FY2044 | 17% | 5% |
| U.S. HBM Packaging | $5.2B | FY2030E | $2.5B | FY2034 | FY2036 | FY2038 | FY2042 | 29% | 13% |
| New York Fab 2 Option | $20.8B | FY2034E | $8.0B | FY2038 | FY2041 | FY2043 | FY2048 | 26% | 6% |
| New-project subtotal | $121.8B | FY2026 onward | $50.9B | FY2032 | FY2035 | FY2037 | FY2042 | ~31% | ~9% |
| Existing fab estate | Historical sunk capital | Operating | ~$28.4B | N/M | N/M | N/M | N/M | N/M | N/M |
| Total modeled Micron | Existing estate plus $121.8B | Operating | ~$79.3B | N/M | N/M | N/M | N/M | N/M | N/M |
What the table suggests
Brownfield expansions and bottleneck investments appear strongest. Tongluo P5 and Hiroshima reuse existing manufacturing infrastructure, while HBM packaging can unlock higher-value products without requiring another front-end wafer fab.
Idaho remains attractive in the base case, although downside returns fall to roughly 11%–12%. The New York projects require longer construction periods and produce only about 6% downside IRRs. Singapore NAND is the weakest project in the model, with a 10% base IRR and a negative downside return.
The project returns are not independent. A new fab raises Micron’s production, but it can also increase industry supply and reduce the price earned by both the new facility and Micron’s existing fabs. The roughly 31% aggregate base IRR therefore depends on demand absorbing the additional capacity.
What the pipeline implies for valuation
| Item | Modeled amount |
|---|---|
| Existing-estate mature annual cash income | ~$28B |
| New-project mature annual cash income | ~$51B |
| Total mature annual cash income | ~$79B |
| Equity value around July 11, 2026 | ~$1.1T |
| Value against mature cash income | ~14× |
About $80B of mature annual cash generation broadly supports Micron’s current valuation, but does not clearly justify a dramatically higher one. Further upside requires additional profitable projects, higher mature margins, or evidence that HBM and long-term customer agreements have made the business structurally less cyclical.
Micron is mainly constrained by the amount of new capacity the market can absorb at attractive prices—not by its ability to finance another fab.
Methodology, assumptions, and sources
Mature annual cash income is defined as after-tax site operating cash generation after recurring maintenance and retooling expenditure. Packaging and assembly projects receive only the incremental cash benefit they enable, rather than standalone memory revenue that would double-count wafer output.
Base IRRs are calculated over 15 years from the start of modeled project spending, without a terminal value. The downside case assumes higher construction costs, a one-year delay, slower ramps, and materially lower mature income. Project-level net investment, revenue capacity, and margins are estimates because Micron generally discloses regional spending envelopes and production timing rather than full economics for individual sites.
The existing-estate estimate assumes approximately $118B of normalized annual revenue, a 46% cash operating margin, a 15% cash tax rate, and sustaining or node-transition capital expenditure equal to 15% of revenue. The New York Fab 2 row is an option based on Micron’s plan for up to four New York fabs, not a separately committed facility.
Project timing and company figures are based primarily on Micron’s fiscal Q3 2026 presentation, fiscal Q3 2026 Form 10-Q, U.S. expansion plan, Tongluo acquisition update, Singapore HBM packaging announcement, and Singapore NAND announcement.