T-Mobile (TMUS) Q4 2025 earnings review
Top-Line Boom, Bottom-Line Bust
T-Mobile delivered a paradoxical quarter. Revenue growth accelerated to nearly 11% YoY, fueled by the UScellular acquisition and best-in-class customer adds. However, this growth came at a steep price: Net Income plunged 30% and EPS fell 27% as integration costs, severance, and rising service expenses hammered profitability. While the customer growth engine remains unrivaled (962k phone adds), the 'un-carrier' is currently struggling to convert that volume into bottom-line earnings growth, though FY26 guidance suggests a return to EBITDA expansion.
🐂 Bull Case
The growth engine is firing on all cylinders. T-Mobile added 962k postpaid phone customers in Q4 alone—leading the industry. Total broadband adds (558k) also accelerated, proving the company can win share even while digesting a major acquisition.
Management guided FY26 Core Adjusted EBITDA to $37.0–$37.5B, implying ~10% growth over FY25. This suggests the current margin compression is temporary 'indigestion' from M&A integration rather than a structural problem.
🐻 Bear Case
Net Income collapsed 30% YoY. Even excluding the $293M severance charge, profitability is under pressure. Cost of services surged 23% and SG&A jumped 23%, far outpacing revenue growth. The 'profitable growth' narrative has stalled.
Postpaid phone churn spiked to 1.02% in Q4, up from 0.89% in Q3 and 0.92% a year ago. Management cites 'higher industry switching,' but this breaks the trend of steady improvement and warrants close monitoring during the integration phase.
⚖️ Verdict: ⚪
Neutral. Top-line execution is flawless, but the cost of buying growth (UScellular/Fiber) is temporarily crushing GAAP earnings. The thesis holds only if FY26 guidance delivers the promised 10% EBITDA ramp.
Key Themes
Merger Indigestion Hits Margins
The UScellular and fiber acquisitions have introduced significant noise and cost. Cost of services (ex-D&A) skyrocketed 23% YoY to $3.3B, and SG&A rose 23% to $6.6B. Consequently, Net Income margin compressed from 13.6% last year to 8.6% this quarter. While synergies are promised, the immediate reality is a sharp reversal in operating leverage.
Churn Spike Alert
Postpaid phone churn hit 1.02%, crossing the psychological 1% threshold for the first time in recent quarters. While seasonal trends and industry switching are cited, a 10bps sequential jump suggests potential friction from integrations or aggressive competitive offers. This breaks T-Mobile's multi-year streak of churn reduction.
Dominant Customer Acquisition
T-Mobile continues to embarrass peers on growth. Q4 Postpaid Net Adds (2.4M) and Phone Net Adds (962k) accelerated sequentially and YoY. The machine is not slowing down: FY26 guidance projects another 900k-1M postpaid account additions. The widening gap between T-Mobile's intake and competitors is the strongest pillar of the bull case.
Broadband Juggernaut
The broadband segment (FWA + Fiber) remains a key growth vector, adding 558k customers in Q4 (vs 506k in Q3). With 9.4M total broadband customers, T-Mobile has successfully diversified beyond mobile. The acceleration in adds proves the addressable market is not yet saturated.
Capital Return Machine
Despite earnings pressure, cash flow remains robust enough to support shareholder returns. T-Mobile repurchased $2.5B in shares and paid $1.1B in dividends in Q4. FY25 total returns hit $14.0B. The authorization allows for another $14.6B through 2026, providing a floor for the stock price.
Other KPIs
Accelerating. Growth hit +13.9% YoY, up from +10.7% for the full year. This is the cleanest indicator of organic health + acquisition layering. It confirms that the top-line thesis is intact.
Stable. Grew 6% YoY. While solid, this trails the 11% service revenue growth, highlighting the cash costs of integration and capital expenditures ($10B). Q4 FCF actually declined 13% sequentially.
Reversing. Margin compressed from 47.6% in Q3 25 to 45.2% in Q4. This 240bps drop reflects the immediate dilutive impact of UScellular and Fiber acquisitions before synergies are realized.
Guidance
Accelerating. Midpoint implies ~10% growth vs FY25 ($33.9B). This is the critical 'prove it' number—management is promising that the Q4 margin compression is temporary and synergies will kick in fast.
Decelerating. The midpoint ($18.35B) implies only ~2% growth over FY25 ($18.0B). Despite the projected 10% EBITDA boom, cash flow is barely growing. This suggests heavy cash costs for integration or working capital drags are expected to persist through 2026.
Stable. Flat vs FY25 ($9.96B). This indicates the network buildout is steady, and the muted FCF growth isn't due to a sudden spike in infrastructure spending.
Key Questions
The EBITDA-FCF Disconnect
You are guiding for ~10% EBITDA growth in 2026 but only ~2% Free Cash Flow growth. With CapEx flat, where is the $3 billion delta going? Is this all merger integration cash costs?
Churn Normalization
Churn broke the 1% ceiling this quarter. How much of this is strictly UScellular integration friction vs. a structural change in the competitive environment, and when do you expect to return to sub-0.90% levels?
Expense Baseline
SG&A and Cost of Services both jumped 23% this quarter. Is Q4 the new run-rate baseline for the combined entity, or were there significant one-off integration expenses booked in Q4 that will fall off in Q1?