Prothena Corp Public (PRTA) Tax Rate (2012 - 2026)

Prothena Corp Public's Tax Rate history runs 15 years deep, the most recent figure standing at 0.0% for Q1 2026.

• In Q1 2026, Tax Rate fell 192.0% year-over-year to 0.0%; the TTM figure through Mar 2026 stood at 41.57% (down 4631.0% YoY), while the FY2025 annual figure was 21.54%, down 2668.0% from the prior year.
• Tax Rate for Q1 2026 stood at 0.0%, down from 0.17% in the prior quarter.
• The five-year high for Tax Rate was 7.3% in Q2 2023, with the low at 89.81% in Q4 2022.
• The 5-year median for Tax Rate is 1.92% (2025), against an average of 7.3%.
• The sharpest annual moves came in 2022 and 2023: Tax Rate sank 8967 bps in 2022, then jumped 9425 bps in 2023.
• Prothena Corp Public's Tax Rate stood at 89.81% in 2022, then surged by 105 bps to 4.45% in 2023, then plunged by 43 bps to 2.55% in 2024, then slumped by 93 bps to 0.17% in 2025, then plunged by 98 bps to 0.0% in 2026.
• Business Quant data shows PRTA's Tax Rate at 0.0% in Q1 2026, 0.17% in Q4 2025, and 1.08% in Q3 2025.