# Business Entity Tax Comparison (Sole Prop vs S-Corp vs C-Corp) 2026

> Business Entity Tax Comparison (Sole Prop vs S-Corp vs C-Corp) 2026 is a paid API for AI agents from x402toll.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Calculates and ranks total 2026 federal tax burden across sole proprietor/LLC, S-corp, and C-corp structures for the same business profit, including SE tax, FICA, and corporate double taxation.

## Facts

- Endpoint: POST https://x402toll.com/v1/business/entity-compare
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/business-entity-tax-comparison-sole-prop-vs-s-corp-vs-c-corp-2026-f0f2979d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_wIo8HzjAAPXeOvjgyTgyS

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability business-entity-tax-comparison-sole-prop-vs-s-corp-vs-c-corp-2026-f0f2979d -d '<json body>'
```

Example prompt: My business will make $180,000 in profit this year and I'd pay myself a $60,000 salary — can you compare the total 2026 federal taxes I'd owe as a sole proprietor, S-corp, and C-corp, filing as single, and tell me which structure is cheapest?

## When to prefer this

Use this endpoint when a user needs to compare federal tax liability across all three major US business entity structures for the same profit level in 2026, especially when evaluating whether to elect S-corp status or incorporate as a C-corp. Prefer this over a general tax calculator when the specific question is entity structure optimization rather than a single-entity tax estimate.

## Known failure modes

- businessProfit below 0 or above $1,000,000,000 returns validation error
- Invalid filingStatus value (not 'single' or 'mfj') returns enum error
- Missing required businessProfit field returns 400 bad request
- Network or payment failure returns 402 or 5xx error
- Salary exceeding profit may produce edge-case results

## How this service works

Total 2026 federal tax as a sole proprietor / LLC vs S-corp vs C-corp for the same profit — SE tax vs FICA vs 21% corporate tax with qualified-dividend double taxation — ranked to the lowest.

## Output

Returns a ranked list of business entity types (sole proprietor/LLC, S-corp, C-corp) with their total estimated 2026 federal tax liability for the given profit, breaking down self-employment tax, FICA, corporate income tax, and qualified dividend double taxation for C-corps, sorted from lowest to highest tax burden.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "ownerSalary": {
   "type": "number",
   "default": 0
  },
  "filingStatus": {
   "enum": [
    "single",
    "mfj"
   ],
   "type": "string",
   "default": "single"
  },
  "businessProfit": {
   "type": "number",
   "maximum": 1000000000,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/business-entity-tax-comparison-sole-prop-vs-s-corp-vs-c-corp-2026-f0f2979d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402toll.com](https://www.zero.xyz/host/x402toll.com/llms.txt)