Capital Gains Tax for Idaho (2026)
Idaho (ID) Key Facts
State Capital Gains Rate
5.8%
Taxed As
Ordinary income
Federal Rate Applies
Yes (0%, 15%, or 20%)
Long Term vs Short Term
Both taxed at state level
How This Calculator Works in Idaho
This calculator estimates your combined federal and Idaho capital gains tax. Enter your gain amount, holding period, and income to see your estimated tax.
Idaho Overview
Idaho taxes capital gains as ordinary income at a flat 5.8%. Federal capital gains taxes also apply, with long-term rates of 0%, 15%, or 20% depending on income. The combined state and federal burden should be considered when planning asset sales or investment strategies.
How Idaho Compares
Idaho's capital gains rate of 5.8% compares to Washington at 7% and Oregon at 9.9%. State capital gains taxes significantly impact net investment returns.
| State | Top Rate | Notes |
|---|---|---|
| Washington | 7% | Washington has a capital gains rate of 7%. |
| Oregon | 9.9% | Oregon has a capital gains rate of 9.9%. |
| Montana | 6.75% | Montana has a capital gains rate of 6.75%. |
Idaho's capital gains rate of 5.8% compares to a national average of approximately 5.04%. This is above the national average.
Tips for Idaho Residents
- 1Idaho taxes capital gains as ordinary income at a flat 5.8%.
- 2Federal long-term gains (held 1+ year) are taxed at 0%, 15%, or 20%. Idaho's state tax applies on top of the federal rate.
- 3Hold investments over one year to qualify for lower federal long-term rates rather than ordinary income rates.
- 4Tax-loss harvesting—selling losing investments to offset gains—reduces both federal and Idaho state capital gains tax.
- 5Consider the combined federal + state rate when planning large asset sales. The total can exceed 29.6% for high earners.