Roth conversion taxes in New Hampshire (2026)
By Mario Bailey · Published · Last reviewed
New Hampshire has no state income tax, so a Roth conversion costs you nothing at the state level: only federal tax applies. That makes the federal bracket math, IRMAA thresholds, and Social Security interaction the entire decision. The table below confirms the zero-state-tax result at three income levels.
Computed example: $50,000 conversion
State tax only (federal not included), age 66, standard deduction, no other state adjustments. Computed with the same functions the calculator uses.
| Filing status | Baseline income | State tax without conversion | With $50,000 conversion | Tax on the conversion | Effective rate |
|---|---|---|---|---|---|
| Single | $40,000 | $0 | $0 | $0 | 0.0% |
| Single | $80,000 | $0 | $0 | $0 | 0.0% |
| Single | $150,000 | $0 | $0 | $0 | 0.0% |
| Married filing jointly | $40,000 | $0 | $0 | $0 | 0.0% |
| Married filing jointly | $80,000 | $0 | $0 | $0 | 0.0% |
| Married filing jointly | $150,000 | $0 | $0 | $0 | 0.0% |
Social Security and retirement income
New Hampshire does not tax Social Security benefits. A conversion can still raise the federally taxable share of your benefits through the provisional income formula.
FAQ
Does New Hampshire tax Roth conversions?
No. New Hampshire has no state income tax, so only federal tax applies to a conversion.
Does New Hampshire tax Social Security benefits?
No. Social Security benefits are not subject to New Hampshire income tax.
What is the top New Hampshire rate on a conversion in 2026?
0%. New Hampshire does not levy income tax on Roth conversions.