Roth Conversion in South Carolina
A Roth conversion in South Carolina is taxed as ordinary income at the state’s 2026 marginal rate of 5.21%, the top rate created by H.4216 (Act 110), which replaced the old graduated brackets that topped out at 6.0% for 2025 (6.2% in 2024), effective for the 2026 tax year (Source: SC Department of Revenue, “Information about H.4216,” dor.sc.gov, 2026). South Carolina taxes the converted amount only to the extent it exceeds the state’s retirement and age-65 deductions, then never taxes qualified Roth withdrawals again.
South Carolina taxes a Roth conversion as ordinary income. Under H.4216 for 2026, tax is 1.99% on taxable income under $30,000 and 5.21% above $30,000 (minus a $966 offset), so the top marginal rate on a conversion is 5.21%. The retirement income deduction and the $15,000 age-65 deduction can shrink the taxed portion (Source: SC DOR H.4216 and retiree tax-tip pages, dor.sc.gov, 2026).
Does South Carolina Tax a Roth Conversion?
Yes. South Carolina treats a Roth conversion from a traditional IRA or 401(k) as a taxable distribution of ordinary income. Because H.4216 starts the state calculation from your federal adjusted gross income, the converted dollars flow straight into South Carolina taxable income and are taxed at the 2026 rates, with a top marginal rate of 5.21% (Source: SC DOR, “Information about H.4216,” dor.sc.gov, 2026).
A conversion moves money from a pre-tax account into a Roth account, and South Carolina collects income tax on that transfer in the conversion year. After that, qualified Roth withdrawals are not taxed by South Carolina, so the state tax is paid once and not again in retirement. Our overview of Roth conversion planning explains the federal side that runs alongside these state rules.
Two South Carolina offsets can reduce the amount actually taxed: the retirement income deduction and, at age 65 and older, the $15,000 age-65 deduction. A conversion sourced from a traditional IRA or 401(k) is taxed only to the extent it exceeds the deductions you can claim that year (Source: SC DOR retiree tax-tip page and SC Code 12-6-1170, 2026). For a state-by-state framing, see our guide to Roth conversion state taxes.
South Carolina Income Tax Rate 2026 on a Roth Conversion
For 2026, H.4216 sets two rates: 1.99% on taxable income below $30,000 and 5.21% at $30,000 and above, then minus a $966 blending offset. At exactly $30,000 both formulas produce $597 of tax. The effective top marginal rate on a Roth conversion is 5.21%, not the 6.2% still shown in some older tables (Source: SC DOR “Information about H.4216,” dor.sc.gov, 2026).
H.4216 (Act 110), signed March 30, 2026, rewrote South Carolina’s individual income tax. It replaced the prior graduated structure, which topped out at 6.0% for 2025 (6.2% in 2024, reduced to 6.0% effective July 1, 2025), with the two-rate system above, decoupled the state from federal deductions, and created a new “SC Income Adjusted Deduction” (SCIAD) of $15,000 single, $22,500 head of household, and $30,000 married filing jointly. The single SCIAD phases out as federal AGI rises from $40,000 to $95,000 and is fully eliminated once federal AGI reaches $95,000 (Source: SC DOR “Information about H.4216,” dor.sc.gov, 2026; H.4216 bill text, scstatehouse.gov, 2026). Some third-party tables, including the Tax Foundation’s 2026 brackets, still show the pre-H.4216 numbers because that snapshot predates enactment; for a 2026 conversion the operative figure is 5.21%. The law also allows further top-rate cuts in future years if state revenue growth reaches 5% or more, which is why conversion timing is a genuine South Carolina question. Our note on how much to convert to Roth covers bracket-filling across years.
Does South Carolina Tax IRA and 401(k) Withdrawals?
Yes. South Carolina taxes traditional IRA and 401(k) distributions as ordinary income; unlike Pennsylvania, it does not exempt qualified retirement distributions. It does grant a retirement income deduction of up to $3,000 per year under age 65 and up to $10,000 at 65 and older, per taxpayer with qualifying retirement income (Source: SC DOR retiree tax-tip page and SC Code 12-6-1170, 2026).
The retirement income deduction attaches to “qualifying retirement income,” which the DOR defines to include IRA, 401(k), and public or private pension income. On a joint return where both spouses are 65 or older with qualifying retirement income, each can claim up to $10,000, for $20,000 combined. Because a Roth conversion is a distribution from a traditional IRA or 401(k), this deduction can offset the converted amount (Source: SC DOR retiree tax-tip page, 2026).
This South Carolina interaction is easy to overlook because it is state-specific. A conversion competes with ordinary IRA and pension withdrawals for the same annual deduction, so a year with a large conversion may leave little room to also shelter regular distributions. Sequencing the conversion, the pension start date, and required minimum distributions (age 73, or 75 for those born in 1960 or later) against a single annual deduction is a South Carolina specific decision.
South Carolina Retirement Income Deduction and the Age-65 Deduction
South Carolina’s retirement income deduction is $3,000 per year under age 65 and $10,000 at age 65 and older, per taxpayer with qualifying retirement income. Starting the year you turn 65, a separate $15,000 age-65 deduction applies against any South Carolina income, reduced by any retirement income deduction or military deduction claimed (Source: SC DOR “Age 65 and Older Deduction” and retiree tax-tip page, dor.sc.gov, 2026).
These two deductions stack, with one adjustment. The $15,000 age-65 deduction is reduced by the retirement income deduction you claim, so a filer who claims the full $10,000 retirement deduction at 65+ has $5,000 of age-65 deduction remaining. Together they can shelter up to $15,000 of income for a single 65+ filer, on top of the $15,000 SCIAD that replaced the standard deduction (Source: SC DOR, 2026).
The age boundary drives a real timing choice. Below 65 the retirement deduction is only $3,000 and there is no age-65 deduction, so more of a conversion is exposed to the 5.21% rate; at 65 and older the combined deductions rise. See Roth conversion break-even analysis for how the age cutoff changes the math across multiple years.
Does South Carolina Tax Social Security?
No. South Carolina fully exempts Social Security benefits from state income tax. The DOR states that Social Security and railroad retirement benefits taxed for federal purposes are exempt from South Carolina individual income tax (Source: SC DOR retiree tax-tip page, dor.sc.gov, 2026). A Roth conversion does not add South Carolina tax on your benefits, though it can affect the federal taxation of those benefits.
South Carolina’s full Social Security exemption matters for conversion planning because the state tax question centers on the converted amount and your retirement deductions, not on your benefits. The federal side still moves. A conversion raises your federal provisional income, which can push more of your Social Security benefits into the federally taxable range and can lift you into a higher Medicare IRMAA bracket two years later. South Carolina does not tax the benefits, but these federal ripples belong in any conversion projection alongside the taxation of Social Security benefits in 2026.
South Carolina Military Retirement Tax Exemption
South Carolina fully exempts military retirement pay from state income tax at any age. The DOR states that all military retirement pay included as taxable income is exempt from South Carolina individual income tax, regardless of the recipient’s age. Reserve and National Guard retirement paid by the U.S. government is also exempt (Source: SC DOR retiree tax-tip page, dor.sc.gov, 2026).
For a retired servicemember planning a conversion, the military exemption frees up the retirement income deduction and age-65 deduction to offset converted IRA or 401(k) dollars, since military pay is removed from South Carolina taxable income entirely. The age-65 deduction is reduced by any military retirement deduction claimed, so the interaction should be modeled rather than assumed (Source: SC DOR “Age 65 and Older Deduction,” 2026).
South Carolina Estate Tax 2026
South Carolina has neither a state estate tax nor an inheritance tax in 2026. The state repealed its estate tax for decedents dying after January 1, 2005, and no state death tax applies today (Source: SC statute repealing the estate tax effective 2005). Only the federal estate tax applies, with a 2026 exemption of $15,000,000 per person and a top rate of 40%.
The absence of a South Carolina death tax supports the case for Roth accounts as a wealth-transfer tool, because heirs inherit Roth assets without South Carolina income tax on qualified withdrawals and without any state estate or inheritance tax. The only estate-level exposure is federal; see our summary of the 2026 estate tax exemption.
Rothology® Premier Roth Conversion
A flat-fee, fiduciary Roth conversion planning service: a multi-year conversion plan and tax projections that account for your state. Educational conversation first; no products sold.
Roth Conversion Tax Calculator for South Carolina: An Illustrative $100,000 Example
On an illustrative $100,000 Roth conversion by a single South Carolina resident, state tax depends on age and deductions. This example assumes the converted amount qualifies as retirement income under SC Code 12-6-1170, so the $3,000/$10,000 retirement deduction and the age-65 deduction apply; that treatment is not settled. At age 67 the filer is taxed on $85,000, about $3,462. Figures are illustrative (Source: SC DOR H.4216 guidance, 2026).
The table below is illustrative and shows how the same $100,000 conversion is taxed before and after age 65, assuming a single filer whose only South Carolina taxable income is the conversion (Social Security, if any, is exempt and excluded). Because federal AGI is $100,000, above the $95,000 single SCIAD phase-out endpoint, no SCIAD applies. The table also assumes the converted amount is treated as qualifying retirement income under SC Code 12-6-1170, so the $3,000/$10,000 retirement deduction and the age-65 deduction offset it. Whether a Roth conversion qualifies for the retirement income deduction is not settled; if it does not, the taxable amount and the tax would be higher than shown. It is a teaching illustration, not advice or a prediction of your result.
| Step (single filer) | Age 62 (under 65) | Age 67 (65+) |
|---|---|---|
| Roth conversion (ordinary income) | $100,000 | $100,000 |
| SCIAD deduction (single), phased out at $95,000+ AGI | $0 | $0 |
| Retirement income deduction | -$3,000 | -$10,000 |
| Age-65 deduction (net of retirement deduction) | $0 | -$5,000 |
| South Carolina taxable income | $97,000 | $85,000 |
| Tax: 5.21% x taxable income, minus $966 | ~$4,088 | ~$3,462 |
| Effective state rate on the conversion | ~4.1% | ~3.5% |
Two caveats keep this honest. The example already reflects the SCIAD being fully phased out at $100,000 of single AGI; a filer with lower federal AGI, or a married couple, could retain some SCIAD and owe less, while other income could reduce it further (Source: SC DOR “Information about H.4216,” 2026). And this is only the South Carolina layer: the conversion is also federally taxed as ordinary income (up to 37%) and can affect Social Security taxation and IRMAA. A full projection combines both layers.
Roth Conversion Before Moving to South Carolina: Residency and Timing
South Carolina taxes residents on all income, including the full ordinary-income amount of a Roth conversion. Under 4 U.S.C. 114, no state may tax the retirement income of a non-resident, so a conversion is taxed by your state of legal domicile in the conversion year (Source: 4 U.S.C. 114; SC1040 instructions defining residency as domicile, SC DOR, 2026).
For someone relocating from a high-tax state such as New York, New Jersey, or California, the residency year controls the state tax on a conversion. Convert while still domiciled in the former state and that state’s rate applies; convert after establishing South Carolina domicile and South Carolina’s 5.21% top marginal rate and its deductions apply instead, while the former state generally cannot reach the income under 4 U.S.C. 114. This residency sequencing is a South Carolina specific planning point worth weighing when timing a conversion around a move, because the residency year controls which state taxes the conversion. Our overview of moving to a tax-friendly state in retirement covers how domicile is established and documented.
Timing layers on top of residency. South Carolina’s H.4216 allows further top-rate reductions in future years if state revenue growth hits 5% or more, and the deductions change at 65, so the “convert now versus later” question here involves the state’s own rate trajectory and age thresholds, not just federal brackets. None of this is a recommendation to move or convert; it is the set of South Carolina variables a plan should weigh.
Is South Carolina Tax Friendly for Retirees?
South Carolina treats retirement income favorably: Social Security and military retirement are fully exempt, IRA and pension income qualify for a $3,000/$10,000 deduction plus a $15,000 age-65 deduction, there is no estate or inheritance tax, and the 2026 top income rate is 5.21% under H.4216 (Sources: SC DOR retiree tax-tip and H.4216 pages, 2026). Retirement distributions are still taxable, unlike in Pennsylvania.
Beyond income tax, South Carolina offers a homestead exemption that removes property tax on the first $50,000 of fair market value of a legal residence for owners age 65 and older, with no income limit, layered on the 4% legal-residence assessment ratio (Source: SC Code 12-37-250; SC DOR “Exempt Property,” dor.sc.gov, 2026). South Carolina also excludes 44% of net long-term capital gains from state taxable income, so only 56% of a long-term gain is taxed (Source: SC Code 12-6-1150; SC DOR, 2026). That capital-gains exclusion applies to investment gains, not to a Roth conversion, which is taxed as ordinary income.
“Tax friendly” is a factual description of these rules, not a ranking or a recommendation. Whether South Carolina’s treatment favors your own conversion depends on your income sources, age, and residency, which is the analysis our Roth conversion service performs household by household.
How Rothology Plans a Roth Conversion for South Carolina Residents
Rothology Premier Roth Conversion is a flat-fee, fiduciary planning service from Q3 Advisors that builds a multi-year conversion plan and tax projections incorporating your state of residence. For a South Carolina resident, that means modeling the H.4216 rates, the retirement income deduction, the age-65 deduction, the SCIAD, and the federal ripple effects on Social Security taxation and IRMAA.
The state and federal layers are viewed together so neither is planned in isolation. Q3 Advisors is a fiduciary and sells no insurance or investment products; the fee is a flat consulting fee for the plan itself, and nothing here is a promise of tax savings or a specific outcome.
- Multi-year conversion schedule modeled against South Carolina’s 5.21% top marginal rate and its deductions.
- Coordination of conversions with the $3,000/$10,000 retirement deduction and the $15,000 age-65 deduction.
- Federal projection for Social Security taxation and IRMAA thresholds triggered by conversion income.
- Residency and domicile sequencing for households relocating to South Carolina.
Frequently asked questions
Does South Carolina tax Roth conversions?
Yes. South Carolina taxes a Roth conversion from a traditional IRA or 401(k) as ordinary income at the 2026 H.4216 rates, with a top marginal rate of 5.21% on amounts above $30,000 (minus a $966 offset). The retirement income deduction and the age-65 deduction can reduce the taxed portion, and qualified Roth withdrawals are not taxed by South Carolina afterward (Source: SC DOR H.4216 guidance, dor.sc.gov, 2026).
Does South Carolina tax Social Security retirement benefits?
No. South Carolina fully exempts Social Security benefits from state income tax. The DOR states that Social Security and railroad retirement benefits taxed for federal purposes are exempt from South Carolina individual income tax (Source: SC DOR retiree tax-tip page, dor.sc.gov, 2026). A Roth conversion adds no South Carolina tax on your benefits, though it can raise the federally taxable share of those benefits.
What is the South Carolina retirement income deduction for 2026?
South Carolina allows a retirement income deduction of up to $3,000 per year under age 65 and up to $10,000 at age 65 and older, per taxpayer with qualifying retirement income such as IRA, 401(k), and pension income. Beginning at 65, a separate $15,000 age-65 deduction also applies, reduced by any retirement deduction claimed (Source: SC DOR retiree tax-tip page and SC Code 12-6-1170, 2026).
At what age do you stop paying income tax on retirement income in South Carolina?
There is no age at which South Carolina stops taxing retirement distributions entirely, but at 65 the deductions grow. A 65+ filer can claim up to $10,000 of retirement income deduction plus a $15,000 age-65 deduction (net of the retirement deduction). Social Security and military retirement are exempt at any age (Source: SC DOR retiree tax-tip and “Age 65 and Older Deduction,” dor.sc.gov, 2026).
Does South Carolina have an estate or inheritance tax?
No. South Carolina has neither a state estate tax nor an inheritance tax in 2026, having repealed its estate tax for deaths after January 1, 2005. Only the federal estate tax applies, with a 2026 exemption of $15,000,000 per person and a 40% top rate (Source: SC statute repealing the estate tax effective 2005; federal figures per IRS, 2026).
How much can a married couple deduct on retirement income in South Carolina?
On a joint return where both spouses are 65 or older and each has qualifying retirement income, each can claim up to $10,000 of retirement income deduction, for $20,000 combined. Each spouse who is 65+ may also claim a $15,000 age-65 deduction, reduced by the retirement deduction claimed. The married SCIAD replacing the standard deduction is $30,000 (Source: SC DOR retiree tax-tip page and H.4216 guidance, 2026).
Should I do a Roth conversion before or after moving to South Carolina?
The state that taxes a conversion is your state of legal domicile in the conversion year, because under 4 U.S.C. 114 no state may tax a non-resident’s retirement income. A conversion completed after establishing South Carolina domicile is taxed under South Carolina’s rules, not the former state’s. This is a factual framework, not a recommendation (Source: 4 U.S.C. 114; SC DOR residency guidance, 2026).
Sources
- South Carolina Department of Revenue, “Information about H.4216” (Act 110), dor.sc.gov/news/information-about-h-4216, 2026.
- South Carolina Department of Revenue, “Retirees: Lower your Individual Income Tax bill with these five tips,” dor.sc.gov/tax-tips, 2026.
- South Carolina Department of Revenue, “Age 65 and Older Deduction” and “Exempt Property,” dor.sc.gov, 2026; SC1040 instructions (residency and domicile).
- South Carolina Code sections 12-6-1170 (retirement income deduction), 12-6-1150 (44% capital gains exclusion), and 12-37-250 (homestead exemption).
- South Carolina Legislature, H.4216 (Act 110) bill text (SCIAD phase-out: single $15,000 reduced by (federal AGI minus $40,000) / $55,000, eliminated at $95,000), scstatehouse.gov, 2026.
- PolicyEngine, “South Carolina 2026 Tax Changes: H.4216 / Act 110,” 2026; Tax Foundation, “State Individual Income Tax Rates and Brackets, 2026” (reflects pre-H.4216 figures).
- Federal: 4 U.S.C. 114 (state taxation of non-resident retirement income); IRS 2026 estate tax exemption and income tax figures.