📊 Policy Review: Current data cap policies for all major US ISPs as of Q1 2026, verified against published ISP terms of service and FCC Broadband Label disclosures.
The Silent Speed Throttle You Agreed To
When you signed up for your cable internet plan, there was likely a line in the fine print: "Data usage limited to [X] GB per month. Speeds may be reduced after threshold is reached." Many customers never read this, never hit the cap on light usage plans — and then work from home, game daily, and stream 4K content, blowing past the cap without realizing it.
Current Data Cap Policies by ISP (Q1 2026)
- Comcast Xfinity: 1.2 TB/month cap on most plans. Overage: $10 per 50 GB, up to $100 max. "Unlimited" add-on: $30/month. Cap does NOT apply in Northeast US where Comcast faces state-level regulation against caps.
- AT&T Fixed Broadband (DSL): 1 TB cap on DSL plans. Fiber plans (FTTH) remain uncapped as of Q1 2026.
- Cox: Tiered caps from 500 GB to 2 TB depending on plan tier. Throttling to 1 Mbps after cap is exceeded.
- Charter Spectrum: No data caps. A genuine competitive differentiator.
- Google Fiber: No data caps.
- Verizon Fios: No data caps.
- HughesNet Satellite: 15–200 GB of full-speed data. After cap: throttled to 1–3 Mbps until monthly reset.
How to Detect a Data Cap Throttle
Run DCSpeedTest. If your result is suddenly 1–5 Mbps when you normally get 200+ Mbps, and this coincides with the end of the month or the day after multiple large game downloads — you have likely hit your data cap. Log into your ISP's account portal to check current usage before calling support.
How to Avoid Hitting Your Cap
- Enable ISP usage alerts: Most ISPs allow email/text alerts at 75% and 90% of cap.
- Schedule large downloads for off-peak: Some ISPs (like Comcast) do not count usage between 2 AM and 8 AM. Schedule game updates overnight.
- Audit streaming quality: 4K Netflix uses 25 Mbps (7.5 GB/hour). If 4 people stream 4K for 3 hours daily, that is 90 GB/day or 2.7 TB/month — over 2× Comcast's cap.