# The RAG tax

> Canonical: https://bytecosts.com/research/the-rag-tax/

**Direct answer.** The RAG tax is a ByteCosts research deep-dive on ai architecture. “Just add retrieval” sounds free. In practice, grounding a model in your own data wraps the inference quote in a stack of supporting costs. Scroll to assemble the real monthly bill. This page is the finance-readable summary: it explains the cost mechanic behind the headline, links to the interactive data story, and points to the calculators that model the same numbers on your own workload. Read it before you size a budget, pick a model, cloud, or subscription, or defend a pricing decision, because the headline number is rarely the number you actually pay. The summary, key points, related tools, and citation are all in the static HTML before JavaScript runs.

**[Open the interactive data story - 10 min read →](https://bytecosts.com/research/articles/The%20RAG%20Tax.html)**

## Summary

“Just add retrieval” sounds free. In practice, grounding a model in your own data wraps the inference quote in a stack of supporting costs. Scroll to assemble the real monthly bill.

This ByteCosts research note turns the pattern above into budgeting questions and shows where the real cost lands, so ai architecture stops being a surprise on the invoice.

## What "The RAG tax" covers

- The practical cost pattern behind the headline figure
- Why the number on the pricing page is rarely the number you pay
- The budget risk to watch for, and the lever that moves it most
- How to model the same scenario with your own usage in ByteCosts

## Use it with the ByteCosts calculators

Open the interactive story for the full walkthrough, then bring the pattern back to a calculator and replace the example assumptions with your own users, requests, tokens, seats, or platform usage.

The goal is to convert the article's cost pattern into a concrete monthly run-rate, per-user margin, or break-even point your team can actually discuss.

## Frequently asked questions

### Is this research readable before JavaScript runs?

Yes. The summary, direct answer, key points, related tools, and citation block are in the prerendered HTML. The interactive scrollytelling version is a separate linked page.

### Can I model this scenario with my own numbers?

Yes. Use the linked ByteCosts calculators to replace the article's example assumptions with your own workload, usage, and pricing.

## Model this research

- [AI App Cost Calculator](https://bytecosts.com/tools/ai-cost-calculator/)
- [Scenario Studio](https://bytecosts.com/tools/scenario-studio/)
- [All ByteCosts research](https://bytecosts.com/blog/)

## Cite this page

The RAG tax. ByteCosts. https://bytecosts.com/research/the-rag-tax/

**Sources**

- [ByteCosts methodology](https://bytecosts.com/methodology/)
- [ByteCosts research index](https://bytecosts.com/blog/)