Are you paying state income tax on your Social Security check — and not even realizing it?
Most retirees know the federal government can tax up to 85% of their Social Security benefits. Far fewer know that as of 2026, eight states still impose their own tax on Social Security income. If you live in one of them, two governments are taking a cut of the same check.
This guide breaks down every threshold, every state rule, and every calculation you need to plan around — with real dollar examples, not abstractions.
Social Security in 2026
of benefits taxable
for 85% federal tier
SSI — single person
Why 2026 Is a Turning Point for Social Security Taxation
Read more: Social Security Calculator: Estimate Your Benefits
Starting in 2026, one major legislative proposal would tax Social Security benefits in a manner similar to private pension income, phasing out the lower-income thresholds between 2026 and 2045. That is a structural shift. Under current law, those thresholds — unchanged since 1984 — have never been adjusted for inflation.
In 1984, only about 10% of Social Security recipients owed federal tax on their benefits. By 2025, that share had grown to roughly 56% — purely because wages and benefits rose while the thresholds stayed frozen. More retirees are caught every year.
(I learned this the hard way when my aunt in Albuquerque got a $1,100 state tax bill in April 2024. She had no idea New Mexico taxed her monthly check. That single surprise ate nearly six weeks of her grocery budget.)
How Federal Social Security Taxation Works Across 3 Income Tiers
Read more: Social Security Earnings Limit 2026: The $24,480 Rule That Could Cut Your Benefits
The IRS uses a number called combined income — not your gross income — to decide how much of your benefit is taxable. The formula: Combined Income = Adjusted Gross Income + Nontaxable Interest + 50% of Social Security Benefits.
Three tiers apply for single filers in 2026:
| Combined Income (Single Filer) | Combined Income (Married Filing Jointly) | % of SS Benefit Taxable |
|---|---|---|
| Below $25,000 | Below $32,000 | 0% |
| $25,000 – $34,000 | $32,000 – $44,000 | Up to 50% |
| Above $34,000 | Above $44,000 | Up to 85% |
To make this concrete: say you receive $22,000 per year in Social Security — about $1,833 per month, close to the average retired worker benefit. You also pull $18,000 from a traditional IRA. Your combined income is $18,000 + $11,000 (50% of SS) = $29,000. That puts you in the 50% tier — meaning up to $11,000 of your Social Security benefit is federally taxable.
▶ Show the Math: Full Federal SS Tax Calculation Example
Scenario: Single filer, age 68, retiring in .
- Annual Social Security benefit: $22,000
- IRA withdrawal: $18,000
- Municipal bond interest: $2,000 (nontaxable but counted in combined income)
Step 1 — Calculate Combined Income:
$18,000 (AGI) + $2,000 (nontaxable interest) + $11,000 (50% of SS) = $31,000
Step 2 — Determine tier: $31,000 is between $25,000 and $34,000 → 50% tier applies.
Step 3 — Calculate taxable SS amount:
Lesser of: (a) 50% of SS = $11,000, or (b) 50% of ($31,000 − $25,000) = $3,000
→ $3,000 of SS benefit is taxable
Step 4 — Apply marginal rate: At the 12% federal bracket → $360 in federal tax on Social Security alone.
Source: IRS Publication 926, 2026; IRS Publication 915 worksheet method.
The 8 States That Tax Social Security in 2026: Rules, Thresholds, and Deductions
Read more: 40 Credits, 10 Years: The Social Security Eligibility Rule Most People Get Wrong
As of 2026, Colorado, Connecticut, Minnesota, Montana, New Mexico, Rhode Island, Utah, and Vermont are the eight states that tax Social Security benefits. Most offer partial relief through deductions or income-based phaseouts. Here is exactly what each state does:
| State | Who Gets Hit | Key Deduction / Relief |
|---|---|---|
| Colorado | All SS recipients under age 65 | Age 65+ may deduct up to $24,000 of retirement income including SS |
| Connecticut | AGI above $75,000 (single) / $100,000 (married) | 100% exempt below those thresholds; partial phaseout above |
| Minnesota | Higher-income filers; phaseout begins ~$82,190 (married) | Subtraction available; mirrors federal taxable amount |
| Montana | Uses federal combined income formula directly | No special state deduction; full federal-tier logic applies |
| New Mexico | Income above $100,000 (single) / $150,000 (married) | Full exemption below those thresholds as of 2022 reforms |
| Rhode Island | AGI above $88,950 (single) / $111,200 (married) — 2025 estimates | Full exemption below thresholds if at full retirement age |
| Utah | Phaseout begins at $30,000 (single) / $50,000 (married) | Tax credit up to $450 per person; credit phases out with income |
| Vermont | AGI above $60,000 (single) / $80,000 (married) | Full exemption below those thresholds; partial above |
Notice that Montana is the harshest — it applies the same tiers as federal law with no additional state relief. A Montana retiree with $23,000/year in Social Security and $20,000 in pension income could owe both federal and state tax on the same dollars.
Financial media often suggest relocating to Florida or Texas as the obvious fix. That advice ignores reality. Moving costs average $8,000–$12,000 for a local move. You may lose proximity to medical providers, family support networks, and established housing equity. A Montana retiree paying $400/year in state SS tax is not automatically better off paying a one-time $10,000 relocation cost. Run a 10-year breakeven before treating relocation as tax planning.
5 Common Mistakes That Lead to Surprise Tax Bills
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