Castle Biosciences (CSTL) Tax Rate (2018 - 2026)
Castle Biosciences' (CSTL) quarterly Tax Rate came in at 21.89% in Q2 2026, down 330861.0% year-over-year from N/an in Q2 2025, and down 2794.96% quarter-over-quarter from 0.76% in Q1 2026.
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Castle Biosciences (CSTL) Tax Rate (2018 - 2026) Analysis & Trends
Castle Biosciences has disclosed Tax Rate across 9 years of filings, most recently posting 21.89% for Q2 2026.
- In Q2 2026, Tax Rate fell 330861.0% year-over-year to 21.89%; the TTM figure through Jun 2026 stood at 1.1% (down 906.0% YoY), while the FY2025 annual figure was 18.15%, up 276.0% from the prior year.
- Tax Rate came in at 21.89% for Q2 2026 at Castle Biosciences, down from 0.76% in the prior quarter.
- In the past five years, Tax Rate ranged from a high of 3286.71% in Q2 2025 to a low of 29.79% in Q3 2025.
- Average Tax Rate over 5 years is 196.31%, with a median of 0.47% recorded in 2023.
- Year-over-year, Tax Rate jumped 329983 bps in 2025 and sank 330861 bps in 2026.
- Over 5 years, Tax Rate stood at 0.28% in 2022, then tumbled by 454 bps to 1.53% in 2023, then tumbled by 1309 bps to 21.62% in 2024, then jumped by 165 bps to 14.08% in 2025, then sank by 256 bps to 21.89% in 2026.
- Per Business Quant data, the three most recent Tax Rate figures were 21.89% in Q2 2026, 0.76% in Q1 2026, and 14.08% in Q4 2025.
Peer Set
Peer Comparison
| # | Company | Market Cap | Enterprise Value | Gross Profit (Qtr) | Tax Rate (Qtr) |
|---|---|---|---|---|---|
| 1 | Natera | 53.05 Bn | 51.95 Bn | 486.15 Mn | 0.45% |
| 2 | Quest Diagnostics | 27.19 Bn | 26.87 Bn | 1.03 Bn | 21.36% |
| 3 | Labcorp Holdings | 25.93 Bn | 25.81 Bn | 1.11 Bn | 22.59% |
| 4 | Guardant Health | 23.97 Bn | 22.91 Bn | 219.03 Mn | -0.15% |
| 5 | Tempus AI | 13.64 Bn | 12.82 Bn | 274.25 Mn | 3.51% |
| 6 | Caris Life Sciences | 8.47 Bn | 7.68 Bn | 182.38 Mn | -3.75% |
| 7 | Sotera Health | 5.35 Bn | 4.99 Bn | 177.96 Mn | 31.27% |
| 8 | BillionToOne | 4.96 Bn | 4.41 Bn | 77.11 Mn | -7.13% |
| 9 | Adaptive Biotechnologies | 4.55 Bn | 4.21 Bn | 51.39 Mn | - |
| 10 | Castle Biosciences | 1.08 Bn | 811.36 Mn | 79.85 Mn | -21.89% |
Historic Data
Download Data
Historic Data
| Date | Value |
|---|---|
| Jun 30, 2026 | -21.89% |
| Mar 31, 2026 | -0.76% |
| Dec 31, 2025 | 14.08% |
| Sep 30, 2025 | -29.79% |
| Jun 30, 2025 | 3,286.71% |
| Mar 31, 2025 | 1.61% |
| Dec 31, 2024 | -21.62% |
| Sep 30, 2024 | 72.60% |
| Jun 30, 2024 | -13.11% |
| Mar 31, 2024 | -1.81% |
| Dec 31, 2023 | -1.53% |
| Sep 30, 2023 | -0.47% |
| Jun 30, 2023 | -0.09% |
| Mar 31, 2023 | -0.05% |
| Dec 31, 2022 | -0.28% |
| Jun 30, 2022 | 54.29% |
| Mar 31, 2022 | -0.55% |
| Dec 31, 2021 | 57.57% |
| Jun 30, 2021 | -0.06% |
| Dec 31, 2020 | -1.75% |
API Access
Castle Biosciences Tax Rate API
Pull this series into your own models, spreadsheets and apps with the Business Quant
Historical Metrics API. The request below matches the chart above — change the
frequency, period or values and it follows. Swap YOUR_API_KEY for your own key.
https://data.businessquant.com/historic?slug=tax-rate&ticker=CSTL&period=max&api_key=YOUR_API_KEYimport requests
url = "https://data.businessquant.com/historic"
params = {"slug": "tax-rate", "ticker": "CSTL", "period": "max", "api_key": "YOUR_API_KEY"}
data = requests.get(url, params=params).json()const res = await fetch("https://data.businessquant.com/historic?slug=tax-rate&ticker=CSTL&period=max&api_key=YOUR_API_KEY");
const data = await res.json();