In our 510,000-path Monte Carlo study of 30-year retirement outcomes, Mississippi retirees finished at 76.51% success rate (ranked #5 of 51 by success rate, #5 of 51 by lowest median lifetime state tax). Median 30-year state-tax cost: $0. Median terminal balance after 30 years: $987,119. State tax is part of the optimization here — the playbook below shows the federal-state-ACA stack.
The MS verdict
For a retiree planning withdrawals in 2026, Mississippi is broadly retirement-tax-friendly, with most distributions sheltered. Exempts all qualified retirement income — 401(k), ira, pension and social security.
Mississippi exempts qualified retirement income from age 60 — pensions, 401(k) and IRA distributions alike — so a withdrawal costs $0 in state income tax, and a conversion out of one of those accounts is treated the same way. The binding constraints on a Mississippi conversion ladder are the federal bracket, the 400% FPL ACA cliff and the IRMAA two-year lookback, not the state rate.
Worked example: $30k Roth conversion in Mississippi
Consider a married couple age 58 in Mississippi with $75,000 of taxable income, both on ACA Marketplace coverage. They want to convert $30,000 from a traditional IRA to a Roth. The Mississippi state tax on that conversion is approximately $1,200 — the full amount is taxed at 4.00%. Federal tax at the 22% bracket adds another $6,600. And because the conversion pushes their MAGI to $105,000 — over the 400% FPL cliff of $84,600 — they lose their full ACA premium tax credit, roughly $12,000. Total cost of the $30,000 conversion: about $19,800, or an effective 66.0% marginal rate. That state figure uses Mississippi's top bracket rate, so read it as a ceiling: a household whose income lands in a lower bracket pays less, and Mississippi's own deductions reduce it further. The federal-state-ACA stack matters in Mississippi.
Cost breakdown
| Component | Amount |
|---|---|
| Federal income tax (22% bracket) | $6,600 |
| Mississippi state income tax | $1,200 |
| ACA premium tax credit clawback | $12,000 |
| Total cost on $30,000 conversion | $19,800 (66.0% effective) |
Scenario B (friendly): $50k post-65 conversion in Mississippi
A married Mississippi couple age 67, both on Medicare, with $40K pension income converts $50,000 in a single year. State tax owed: $0 — Mississippi exempts qualified retirement income, and a conversion is a distribution from a qualified account. Federal tax at 22%: ~$11,000. No ACA clawback (on Medicare). Total: $11,000, or 22.0% effective. The post-65 conversion window is where a Mississippi ladder is cheapest.
What the Monte Carlo data says about Mississippi
QuantCalc Research ran a 30-year, 10,000-path Monte Carlo simulation for an identical representative retiree (age 60, $2M starting balance, 60/40 portfolio, $80K real annual spend) in each of the 51 U.S. jurisdictions. Here's how Mississippi compared to the best- and worst-case states:
| Metric | Mississippi | Wyoming (best) | California (worst) |
|---|---|---|---|
| 30-year success rate | 76.51% | 77.11% | 69.03% |
| Rank (of 51) | #5 | #1 | #51 |
| Median lifetime state tax (30y) | $0 | $0 | $154,980 |
| Median total tax (30y) | $218,400 | $218,400 | $373,380 |
| Median terminal balance | $987,119 | $999,751 | $695,612 |
| Δ success vs Wyoming | -0.60 pp | — | −8.08 pp |
Sources: QuantCalc 51-State Monte Carlo Study (2026-05-12) — 510,000 total paths, methodology fully documented and dataset released CC-BY-4.0. Mississippi's row in the dataset uses the same portfolio + spend + retirement age as every other state — the only variable is state tax treatment.
How Mississippi treats capital gains in retirement
Mississippi exempts capital gains from sale of authorized Mississippi-based business stock; other LTCG is taxed at the flat 4.00% rate.
Why the ACA cliff hits hard in Mississippi
The 400% federal-poverty-level cliff is federal, not state-specific — but its dollar impact depends on the benchmark Silver-plan premium in your county. Mississippi's Marketplace pricing and your household composition determine the size of the subsidy at risk. A two-person household near 400% FPL can easily have $10,000–$15,000 of annual premium tax credit on the line. Under the OBBBA 2026 restoration of the cliff, $1 of additional MAGI above 400% FPL eliminates the entire credit.
For 2026 the 400% FPL threshold is:
- Household of 1: $62,600
- Household of 2: $84,600
- Household of 3: $106,600
- Household of 4: $128,600
Optimal Roth conversion strategy for Mississippi
The MS-specific playbook depends on tier:
- Identify your cliff distance. Compute MAGI from all income sources (wages, capital gains, interest, dividends, traditional withdrawals). Find your headroom under 400% FPL. Use the live cliff widget above for a quick check.
- Stay under the cliff if you can. In Mississippi at 4.00%, the marginal cost of going over the cliff is federal tax + state tax + full PTC clawback. The break-even conversion size is smaller than in tax-free states.
- If you must go over, convert big. Once you've crossed the cliff, additional conversion dollars only cost federal + state tax (no incremental PTC loss). A "rip the bandage" conversion year can be efficient if you have many traditional dollars to move.
- Coordinate with capital gains and the 0% LTCG bracket. Mississippi exempts capital gains from sale of authorized Mississippi-based business stock; other LTCG is taxed at the flat 4.00% rate.
- Plan ahead for IRMAA. The IRMAA Medicare premium surcharge has a 2-year lookback. A Mississippi resident in their early 60s converting today will see IRMAA implications at 65. See RMD + IRMAA calculator for the lookback math.
State tax basics for Mississippi retirees
| Question | Mississippi |
|---|---|
| State income tax | 4.00% top marginal |
| Number of brackets | 2 |
| Social Security taxed | No |
| 401(k) / Traditional IRA taxed | No / exempt |
| Retirement-income exclusion (couple) | Full exemption |
| Roth conversion draws that exclusion | Not applicable |
| State estate / inheritance tax | No |
| Retirement-friendliness tier | friendly |
| Notable feature | exempts all qualified retirement income — 401(k), IRA, pension and Social Security |
| 30-yr MC success rate (rank) | 76.51% (#5/51) |
| Median 30-yr state tax | $0 |
Model your full Mississippi retirement scenario
Free 10,000-path Monte Carlo with state-specific tax engine, ACA cliff, Roth conversion optimizer, IRMAA lookback — all in your browser, no signup.
Run a free simulation →Related calculators and reading
- All-states retirement tax comparison — see Mississippi alongside the other 50 jurisdictions.
- State Retirement Tax Data 2026 — the per-jurisdiction rate, exclusion and Social Security figures behind this page, as CSV and JSON.
- ACA Subsidy Cliff Optimizer — find the largest Roth conversion that keeps you under 400% FPL.
- Roth Conversion Optimizer — bracket-fill vs. fixed-amount strategy comparison.
- RMD + IRMAA Calculator — Medicare premium surcharge based on 2-year-old MAGI.
- Safe Withdrawal Rate Calculator — sequence-of-returns-aware withdrawal planning.
- Research: 51-State 30-year Monte Carlo (2026) — full ranking and dataset.
- Research: Monte Carlo ACA Cliff 2026 — 80,000-path study of the cliff cost.
FAQ
Does Mississippi tax Roth conversions?
Mississippi taxes Roth conversions as ordinary income at the state level. A $30,000 conversion by a couple aged 58 costs about $1,200 in state tax alone — the full amount is taxed at 4.00% — on top of federal tax and any ACA subsidy clawback. That state figure uses Mississippi's top bracket rate, so read it as a ceiling: a household whose income lands in a lower bracket pays less, and Mississippi's own deductions reduce it further.
What is Mississippi's 30-year Monte Carlo retirement success rate?
In QuantCalc's 510,000-path Monte Carlo study, a representative retiree in Mississippi (age 60, $2M balance, 60/40 portfolio, $80K real spend) finished 30 years at 76.51% success rate — ranked #5 of 51 jurisdictions. Median 30-year state tax: $0. Median terminal balance: $987,119.
What is the ACA cliff in Mississippi for 2026?
The ACA premium-tax-credit cliff is a federal threshold, not state-specific. For a household of two in 2026, it sits at 400% of the federal poverty level — $84,600. Crossing it by even $1 of MAGI eliminates the full subsidy under the OBBBA 2026 rules.
Is Mississippi a good state to retire for tax purposes?
Mississippi is broadly retirement-tax-friendly, with most distributions sheltered. Exempts all qualified retirement income — 401(k), ira, pension and social security. In our Monte Carlo ranking it placed #5 of 51 jurisdictions.
Does Mississippi tax Social Security benefits?
No — Mississippi does not tax Social Security benefits at the state level, at any income level.
Does Mississippi tax 401(k) and IRA withdrawals?
No — Mississippi exempts qualified retirement income from age 60, so 401(k) and traditional IRA withdrawals cost $0 in state income tax.
Does Mississippi have a state estate or inheritance tax?
No — Mississippi does not impose a state-level estate or inheritance tax.
How does Mississippi tax capital gains?
Mississippi exempts capital gains from sale of authorized Mississippi-based business stock; other LTCG is taxed at the flat 4.00% rate.
Last updated 2026-08-23. State income tax figures reflect the 2026 schedule published by Mississippi's tax authority. ACA poverty-level figures from HHS 2026 Federal Register. Monte Carlo numbers from the QuantCalc 51-state research drop (2026-05-12, CC-BY-4.0). This page is educational. Not tax, legal, or financial advice — consult a qualified advisor.