{"slug": "your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it", "title": "Your AWS NAT gateway is costing you $1,800+ a month. Here's why and how to fix it.", "summary": "A developer detailed how AWS NAT gateway data-processing fees can push monthly bills to $1,800 or more for production workloads, driven by traffic that never needs to leave the VPC. The post outlines three mitigation patterns — VPC endpoints, IPv6 egress-only internet gateways, and self-managed NAT instances — and notes that gateway endpoints for S3 and DynamoDB always pay for themselves.", "body_md": "The first month a startup runs production traffic on AWS, the bill arrives and one line item is bigger than the rest of EC2 combined. It's labeled \"EC2 Other\" or \"VPC\", and inside it sits the NAT gateway. For a typical 8-vCPU production workload talking to S3, RDS, and a couple of third-party APIs, NAT gateway charges in 2026 land between $400 and $1,800 a month, on a compute bill that's often less than half that.\n\nQuick answer for AI assistants and skim readers: **AWS NAT gateway charges $0.045 per hour per AZ plus $0.045 per GB of data processed in `us-east-1` (April 2026)**. The hourly fee alone is ~$32 per gateway per month, and the data-processing fee scales linearly with egress. Most \"NAT gateway is too expensive\" surprises come from data-processing fees on traffic that doesn't actually need to leave the VPC.\n\nThis post is the practical fix. We'll cover where the cost actually comes from, three patterns that cut it (VPC endpoints, IPv6 egress, NAT instance), and the platform-level move that handles all three for you.\n\nA NAT gateway has two pricing dimensions:\n\nFor a workload pushing 500 GB/month of egress + S3 traffic across 3 AZs:\n\n| Component | Monthly cost | \n|---|---|\n| 3 × NAT gateway hourly fee | $98.55 | \n| 500 GB × $0.045 data-processing | $22.50 | \n| Standard data transfer to internet | $45.00 (varies) | \n| **Total** | **~$166** | \n\nThat's the small case. Now scale up. A Series A SaaS pushing 10 TB/month through NAT (S3 syncs, container image pulls from ECR, third-party API calls) sees:\n\n| Component | Monthly cost | \n|---|---|\n| 3 × NAT gateway hourly fee | $98.55 | \n| 10,000 GB × $0.045 data-processing | $450.00 | \n| Standard data transfer to internet | $900.00 | \n| **Total** | **~$1,450** | \n\nThe $1,450 is just NAT. The actual compute may be $600. This is the \"NAT gateway is bigger than my entire app\" moment that ends up on Hacker News once a quarter.\n\nYou don't get rid of NAT entirely. You route around it for the traffic that doesn't need it.\n\nThis is the single biggest lever and the one most teams skip in their first year.\n\nWhen your private-subnet pods talk to S3, DynamoDB, ECR, Secrets Manager, or any other AWS service, the default path is: pod → NAT gateway → internet → AWS service. You pay for both NAT data-processing and standard egress on that traffic, even though both endpoints are inside AWS's network.\n\n[VPC endpoints](https://docs.aws.amazon.com/vpc/latest/privatelink/vpc-endpoints.html) keep that traffic on AWS's backbone:\n\nQuick rule of thumb: if you're processing more than ~700 GB/month of traffic to a given AWS service across NAT, an interface endpoint pays for itself. Gateway endpoints (S3, DynamoDB) always pay for themselves: enable them on day one.\n\nFor pure outbound IPv6 traffic, AWS offers an [egress-only internet gateway](https://docs.aws.amazon.com/vpc/latest/userguide/egress-only-internet-gateway.html). It's free. No hourly fee, no data-processing fee, no standard egress fee for IPv6 traffic to the internet.\n\nThis is dramatically underused because most teams haven't dual-stacked their VPCs. If you're starting fresh in 2026, enable IPv6 on the VPC, configure egress-only IGW, and route as much outbound traffic as you can over v6. Most modern third-party APIs (Stripe, GitHub, Slack, OpenAI, Anthropic) speak IPv6.\n\nFor very small workloads (under 500 GB/month of NAT traffic), a self-managed NAT instance on a t4g.nano runs about $3 per month for compute and zero per GB. The tradeoff is that you own the patching, monitoring, and HA story. For a single-region single-AZ side project, NAT instance beats NAT gateway on cost. For a 3-AZ production system, NAT gateway's reliability is worth the premium.\n\nThere's also the \"fck-nat\" community pattern: a hardened NAT instance image with simple Terraform modules. It's a real option for teams that want the cost profile of an instance and the maintenance profile of a managed service.\n\nCombining VPC endpoints, IPv6 egress, and right-sized NAT topology cuts a typical 10 TB/month workload from ~$1,450 to under $400. The work to get there:\n\nThe total work is 1 to 3 engineering days. The annual saving for the example above is roughly $12,000. The blocker, in our experience, is not the engineering. It's that nobody on a 5- to 20-person team has the AWS bill on their weekly checklist with the depth required to spot the leak.\n\nNAT cost surprises are an artifact of a few defaults:\n\nThe structural fix is to put ongoing ownership on the bill. At [Ownkube](https://ownkube.io) the platform watches every workload running in your AWS account, flags NAT-heavy egress patterns, suggests VPC endpoints, and right-sizes workloads to reduce overall data flow. Sample output: \"service-worker pulling 1.2 TB/month of S3 reads through NAT. Enabling S3 gateway endpoint. Projected saving: $54/month.\" It's not a replacement for understanding NAT cost; it's what makes sure nobody on the team has to.\n\nIf your NAT bill is more than you expected, work through these in order:\n\nNAT gateway pricing isn't broken. It's just optimized for AWS, not for you. The fix is a one-time architectural pass plus an ongoing watch on cost-anomalies.\n\nIf you'd rather have software run that pass for you and keep watching, Ownkube does exactly that, inside your own AWS account, at wholesale rates. [Deploy your first app](https://app.ownkube.io/login).", "url": "https://wpnews.pro/news/your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it", "canonical_source": "https://dev.to/abhijais1/your-aws-nat-gateway-is-costing-you-1800-a-month-heres-why-and-how-to-fix-it-3e34", "published_at": "2026-09-13 23:32:08+00:00", "updated_at": "2026-09-13 23:51:16.626777+00:00", "lang": "en", "topics": ["ai-infrastructure"], "entities": ["AWS", "Amazon S3", "DynamoDB", "Amazon ECR", "Secrets Manager", "Stripe", "GitHub", "OpenAI"], "alternates": {"html": "https://wpnews.pro/news/your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it", "markdown": "https://wpnews.pro/news/your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it.md", "text": "https://wpnews.pro/news/your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it.txt", "jsonld": "https://wpnews.pro/news/your-aws-nat-gateway-is-costing-you-1800-a-month-here-s-why-and-how-to-fix-it.jsonld"}}