Illinois to Mississippi Retirement Taxes (2026): Every Tax That Changes

Updated July 27, 2026. Quick answer (2026): Moving from Illinois to Mississippi in retirement, the income-tax saving is zero — both states already leave retirement withdrawals alone. The money is at death. Four separate taxes change when you move — state income tax on withdrawals, state estate tax, state inheritance tax, and what probate costs your heirs. Most comparisons only price the first one.

Illinois vs Mississippi: every tax that changes

Every cell is quoted from our statute-cited 51-jurisdiction dataset. Download the full dataset as CSV.

1. What changes on your annual tax bill

Nothing. Illinois already leaves retirement withdrawals untaxed: Fully exempt: all federally taxed retirement income is subtracted — qualified employer plans (401(k), 403(b), 457), traditional IRA distributions (including Roth conversions), private and government pensions, railroad retirement. Mississippi does not tax them either. If you are moving for the income-tax saving alone, there is no saving to collect — and that is the single most common mistake in Illinois relocation math.

2. What changes at death: state estate tax

This is usually the larger number. Illinois levies an estate tax — yes – $4,000,000 exclusion (not indexed, not a true exemption: estates over $4M are taxed using the pre-2001 federal state-death-tax-credit table on the full taxable estate); effective marginal rates commonly stated as 0.8%-16%; administered by the IL Attorney General — and Mississippi levies none (none). Establishing domicile in Mississippi removes that exposure for assets that are not Illinois real property.

3. What changes at death: state inheritance tax

Neither state levies an inheritance tax. Illinois: none Mississippi: none

4. The one nobody prices: what probate costs your heirs

Illinois uses a reasonable-fee fee model (Reasonable compensation for representatives (755 ILCS 5/27-1) and attorneys (755 ILCS 5/27-2); no percentage schedule.); Mississippi uses a reasonable-fee model (Court’s discretion: ‘such sum as the court deems proper’ considering estate value/worth and difficulty of duties, plus necessary expenses including a reasonable attorney’s fee (Miss. Code §91-7-299). The old 1%-7% statutory guideline was removed by amendment; no percentage schedule today.). Filing fees — Illinois: varies by county Mississippi: varies by county

Full detail: probate cost by state and small-estate limits by state.

Will Illinois still tax me after I move to Mississippi?

Not on your retirement withdrawals, once you genuinely change domicile — but that is a harder test than a change of address, and what you leave behind stays in reach.

• Domicile is a test, not a mailing address. A departing state can and does audit residency. Days present, voter registration, driver’s licence, where your doctors and advisers are, and where you keep what you value all count.
• Real property left behind stays taxable. Keeping a home in Illinois can keep part of the estate within reach of Illinois rules even after you become a Mississippi resident.
• A Roth conversion is taxed where you live in the year you convert. Sequencing a conversion after establishing the new domicile is often worth more than the annual saving — see how all 51 jurisdictions tax Roth conversions.

If you keep a home in Illinois, what happens at death?

Changing domicile moves you. It does not move the house. Illinois levies an estate tax, and it reaches a nonresident decedent’s real property situated there — so a home kept behind after the move stays within Illinois’s reach even once Mississippi is your legal home for every other purpose. For nonresidents the property with Illinois taxable situs is real estate and tangible personal property physically situated in Illinois, including any such property held in trust.

Applies where the entire estate exceeds the $4,000,000 exclusion; tax computed as if resident then apportioned by the Illinois-to-total ratio. The practical consequence is the part most summaries skip: the statute reaches property held in trust, so a revocable trust does not move it out of Illinois. Authority: Illinois Attorney General Form 700 instructions.

This is the exposure that survives a move, and it is the one worth pricing before the move rather than after. The house also stays within that state’s probate jurisdiction, so the estate faces a separate ancillary proceeding there on top of the probate where you live — the ancillary probate calculator prices that second proceeding. Confirm the current figures with the state revenue department or a licensed professional before acting — thresholds move, and the arithmetic depends on the whole estate, not just the house.

Full state detail

Every figure above is summarized. The complete statute-cited breakdown for each state: Illinois retirement taxes and Mississippi retirement taxes. To compare any other pair, start at the retirement tax relocation hub.

Talking this through

Relocation timing, Roth conversion sequencing and estate exposure interact, and the order you do them in changes the total. If you want a second opinion, understand what it should cost first — see our advisor cost guide. If a move is genuinely on the table, here is what to look for in an advisor who knows both Illinois and Mississippi.

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Primary sources

• 35 ILCS 5/203(a)(2)(F)
• IDOR Publication 120 (Retirement Income)
• 35 ILCS 405/2(b)
• 35 ILCS 405/3
• Miss. Code § 27-7-15(4)(k) (retirement income exclusion)
• HB 1 (2025), ‘Build Up Mississippi Act’
• 755 ILCS 5/27-1
• 755 ILCS 5/27-2
• 755 ILCS 5/25-1 (P.A. 104-0346)
• Miss. Code §91-7-299
• Miss. Code §91-7-322

Methodology: every figure is quoted from Clear Money Guide’s statute-cited 51-jurisdiction datasets, compiled from state statutes, session laws and revenue-department publications and adversarially verified in July 2026. Nothing here is personalized tax or legal advice. Confirm your own facts with a qualified adviser before you move.