Mississippi Individual Income Tax Skill — Self-Employed / Sole Proprietor
General reference only. This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.
Scope. This skill covers Mississippi Form 80-105 for full-year Mississippi
residents who are sole proprietors or single-member LLC owners. Mississippi
uses a near-flat tax: 0% on the first $10,000 of taxable income, 4.4% on
income above $10,000 (TY 2025). The rate drops to 4.0% for TY 2026, with
further reductions planned through 2030+.
Quality tier. Q3 — AI-drafted, not independently verified. All rates and
thresholds were researched on 2026-05-22 from official Mississippi Department
of Revenue publications. A qualified professional must review before filing.
Section 1: Metadata
| Field |
Value |
| Jurisdiction |
Mississippi (US-MS) |
| Tax type |
Individual income tax |
| Primary form |
Form 80-105 (Resident Individual Income Tax Return) |
| Tax year |
2025 (filed in 2026) / 2026 |
| Authority |
Mississippi Department of Revenue (MSDOR) |
| Statute |
Miss. Code Ann. § 27-7-5 et seq. |
| Version |
0.1 |
| Last updated |
2026-05-22 |
| Validation |
AI-drafted — Q3 |
Sources consulted
Section 2: Quick reference — rates and thresholds
Tax rates (all filing statuses)
| Tax year |
First $10,000 |
Over $10,000 |
| 2025 |
0% |
4.4% |
| 2026 |
0% |
4.0% |
| 2027 |
0% |
3.75% |
Mississippi applies the same rate structure to all filing statuses (single, MFJ, MFS, HoH).
Standard deduction — 2025
| Filing status |
Amount |
| Single |
$2,300 |
| MFJ / Combined |
$4,600 |
| MFS |
$2,300 (each) |
| Head of Family |
$3,400 |
Personal exemptions — 2025
| Filing status |
Amount |
| Single |
$6,000 |
| MFJ |
$12,000 |
| MFS |
$6,000 (each) |
| Head of Family |
$8,000 |
| Each dependent |
$1,500 |
| Blind taxpayer/spouse |
$1,500 additional |
Key thresholds
| Item |
Value |
Source |
| Filing deadline |
April 15, 2026 (for TY 2025) |
Miss. Code Ann. § 27-7-41 |
| Extension |
Automatic 6-month with federal extension |
MSDOR policy |
| Estimated tax threshold |
$200 expected liability after withholding and credits |
Miss. Code Ann. § 27-7-320 |
Section 3: How this skill works with the federal return
Mississippi taxable income is computed independently from the federal return — Mississippi does NOT start from federal AGI. Instead:
- Report all income — Wages, self-employment income, interest, dividends, capital gains, rental income, etc. are reported directly on Form 80-105 and supporting schedules.
- Adjustments — Mississippi allows its own adjustments (e.g., deduction for 50% of self-employment tax, contributions to MS retirement plans).
- Deductions — Apply the Mississippi standard deduction OR Mississippi itemized deductions.
- Personal exemptions — Subtract personal exemptions ($6,000 single, $12,000 MFJ, etc.).
- Mississippi taxable income — Gross income − adjustments − deductions − exemptions.
- Tax — 0% on first $10,000; 4.4% on excess (TY 2025).
- Credits — Apply applicable credits.
Key difference: Mississippi is a "separate computation" state. It does NOT piggyback on federal AGI or federal taxable income. The taxpayer must independently compute Mississippi income.
Section 4: Self-employed specific rules
- Self-employment income — Report net business income on Form 80-105 directly. Mississippi recognizes the same business income and expenses as the federal return in most cases, but the starting point is gross income, not federal AGI.
- Self-employment tax deduction — Mississippi allows a deduction for 50% of self-employment tax paid, mirroring the federal deduction.
- Estimated taxes — Self-employed taxpayers must make quarterly estimated payments if expected liability exceeds $200. Due dates: April 15, June 15, September 15, January 15.
- Business equipment depreciation — Mississippi generally follows federal depreciation rules, including IRC § 179 expensing. Check conformity for bonus depreciation (IRC § 168(k)).
- Health insurance deduction — Self-employed health insurance premiums are deductible for Mississippi purposes, consistent with the federal deduction.
- No local income tax — Mississippi does not permit local income taxes.
Section 5: Tier 1 rules — deterministic
| Rule ID |
Rule |
Source |
| MS-T1-01 |
Compute Mississippi gross income independently (do not start from federal AGI) |
Miss. Code Ann. § 27-7-15 |
| MS-T1-02 |
Apply 50% self-employment tax deduction |
Miss. Code Ann. § 27-7-17 |
| MS-T1-03 |
Apply standard deduction: $2,300 (single), $4,600 (MFJ), $3,400 (HoF) |
Miss. Code Ann. § 27-7-17 |
| MS-T1-04 |
Apply personal exemptions: $6,000 (single), $12,000 (MFJ), $8,000 (HoF) |
Miss. Code Ann. § 27-7-21 |
| MS-T1-05 |
Apply dependent exemptions: $1,500 per qualifying dependent |
Miss. Code Ann. § 27-7-21 |
| MS-T1-06 |
First $10,000 of taxable income: 0% |
Miss. Code Ann. § 27-7-5 |
| MS-T1-07 |
Taxable income over $10,000: 4.4% (TY 2025) / 4.0% (TY 2026) |
Miss. Code Ann. § 27-7-5 |
| MS-T1-08 |
Interest on U.S. government bonds: exempt from Mississippi tax |
Miss. Code Ann. § 27-7-15 |
| MS-T1-09 |
Social Security benefits: fully exempt from Mississippi tax |
MSDOR guidance |
| MS-T1-10 |
Mississippi does not tax retirement income from MS public retirement systems |
Miss. Code Ann. § 27-7-15 |
Section 6: Tier 2 rules — requires judgment
| Rule ID |
Rule |
Guidance |
| MS-T2-01 |
Residency determination — Mississippi uses a domicile test. A person domiciled in Mississippi or spending 183+ days in the state is a resident. |
If taxpayer has homes in multiple states, flag for professional review. |
| MS-T2-02 |
Separate computation — Mississippi does not start from federal AGI. Verify that all income items are independently reported on Form 80-105. |
Cross-check against federal return to ensure nothing is missed. |
| MS-T2-03 |
Itemized deductions — Mississippi allows itemized deductions similar to federal Schedule A but with Mississippi-specific limits. |
Compare MS itemized vs. standard deduction to choose the better option. |
| MS-T2-04 |
Credit for taxes paid to other states — Available to prevent double taxation on income earned in other states. |
Requires the other state's return. |
| MS-T2-05 |
Income tax phase-out — Rate drops annually (4.4% → 4.0% → 3.75% → ...) with potential full elimination. Confirm the applicable rate for the tax year. |
Check MSDOR for the current-year rate before filing. |
| MS-T2-06 |
Bonus depreciation conformity — Mississippi's conformity to IRC § 168(k) should be verified for the tax year. |
Compare MS conformity date to asset placed-in-service date. |
Section 7: Supplier pattern library
| Pattern |
Treatment |
Notes |
| W-2 wages from Mississippi employer |
MS withholding applies; report on Form 80-105 |
Most common |
| Schedule C net profit (sole prop) |
Report directly on Form 80-105 |
Independent computation |
| Rental income |
Report on Form 80-105 |
MS-source if property in MS |
| Interest on U.S. government bonds |
Exempt from Mississippi tax |
Miss. Code Ann. § 27-7-15 |
| Interest on non-MS muni bonds |
Taxable for MS purposes |
Report as income |
| Social Security benefits |
Fully exempt from Mississippi tax |
Do not include |
| Capital gains from asset sale |
Report on Form 80-105 |
No special MS rate |
| 1099-NEC freelance income |
Report directly on Form 80-105 |
Estimated payments likely needed |
Section 8: Form mapping
| Mississippi form / schedule |
What it covers |
Federal counterpart |
| Form 80-105 |
Resident Individual Income Tax Return |
Form 1040 |
| Form 80-205 |
Non-Resident / Part-Year Resident Return |
Form 1040 |
| Form 80-106 |
Individual Income Tax Adjustments |
Schedule 1 (Form 1040) |
| Form 80-107 |
Income Tax Credits Summary |
N/A |
| Form 80-108 |
Schedule of Deductions (Itemized) |
Schedule A (Form 1040) |
| Form 80-320 |
Estimated Tax Declaration |
Form 1040-ES |
Section 9: Refusal catalogue
| ID |
Situation |
Action |
| MS-R-01 |
Part-year or non-resident return (Form 80-205) |
Refuse — out of scope |
| MS-R-02 |
Corporate income tax (Form 83-100) |
Refuse — out of scope |
| MS-R-03 |
Corporate franchise tax |
Refuse — out of scope |
| MS-R-04 |
Multi-state income apportionment |
Refuse — flag for professional review |
| MS-R-05 |
Amended returns |
Refuse — out of scope |
| MS-R-06 |
Tax year other than current |
Refuse — rates change annually during phase-out |
| MS-R-07 |
Partnership / S-corp pass-through returns |
Refuse — out of scope |
Disclaimer
This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional before filing or acting upon.
The most up-to-date, verified version of this skill is maintained at openaccountants.com.
Source: OpenAccountants — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: source-cited draft. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (openaccountants-mcp).
1---2name: ms-income-tax3description: > Use this skill whenever asked about Mississippi individual income tax for self-employed persons, sole proprietors, or single-member LLCs. Trigger on phrases like "Mississippi income tax", "MS income tax", "Form 80-105", "Mississippi DOR", "Miss. Code Ann. § 27-7".4license: AGPL-3.0-or-later (code) / OpenAccountants Guide License v1.0 (c5---67# Mississippi Individual Income Tax Skill — Self-Employed / Sole Proprietor89> **General reference only.** This skill is general tax/accounting reference material for AI-assisted workflows. It has not been reviewed for any specific person's facts, documents, elections, deadlines, residency, filing status, or local procedures. Do not rely on it to file, pay, amend, or take a tax position without review by a qualified professional in the relevant jurisdiction.1011> **Scope.** This skill covers Mississippi Form 80-105 for full-year Mississippi12> residents who are sole proprietors or single-member LLC owners. Mississippi13> uses a near-flat tax: 0% on the first $10,000 of taxable income, 4.4% on14> income above $10,000 (TY 2025). The rate drops to 4.0% for TY 2026, with15> further reductions planned through 2030+.16>17> **Quality tier.** Q3 — AI-drafted, not independently verified. All rates and18> thresholds were researched on 2026-05-22 from official Mississippi Department19> of Revenue publications. A qualified professional must review before filing.2021---2223## Section 1: Metadata2425| Field | Value |26|---|---|27| Jurisdiction | Mississippi (US-MS) |28| Tax type | Individual income tax |29| Primary form | Form 80-105 (Resident Individual Income Tax Return) |30| Tax year | 2025 (filed in 2026) / 2026 |31| Authority | Mississippi Department of Revenue (MSDOR) |32| Statute | Miss. Code Ann. § 27-7-5 et seq. |33| Version | 0.1 |34| Last updated | 2026-05-22 |35| Validation | AI-drafted — Q3 |3637### Sources consulted3839| # | Source | URL |40|---|---|---|41| 1 | Mississippi DOR — Tax Rates | https://www.dor.ms.gov/individual/tax-rates |42| 2 | Mississippi DOR — General Information | https://www.dor.ms.gov/general-information |43| 3 | Miss. Code Ann. § 27-7-5 (rate statute) | https://law.justia.com/codes/mississippi/title-27/chapter-7/section-27-7-5/ |44| 4 | Build-Up Mississippi Act (income tax phase-out) | https://www.ntu.org/foundation/detail/mississippi-moves-to-end-individual-income-taxheres-what-taxpayers-need-to-know |4546---4748## Section 2: Quick reference — rates and thresholds4950### Tax rates (all filing statuses)5152| Tax year | First $10,000 | Over $10,000 |53|---|---|---|54| 2025 | 0% | 4.4% |55| 2026 | 0% | 4.0% |56| 2027 | 0% | 3.75% |5758Mississippi applies the same rate structure to all filing statuses (single, MFJ, MFS, HoH).5960### Standard deduction — 20256162| Filing status | Amount |63|---|---|64| Single | $2,300 |65| MFJ / Combined | $4,600 |66| MFS | $2,300 (each) |67| Head of Family | $3,400 |6869### Personal exemptions — 20257071| Filing status | Amount |72|---|---|73| Single | $6,000 |74| MFJ | $12,000 |75| MFS | $6,000 (each) |76| Head of Family | $8,000 |77| Each dependent | $1,500 |78| Blind taxpayer/spouse | $1,500 additional |7980### Key thresholds8182| Item | Value | Source |83|---|---|---|84| Filing deadline | April 15, 2026 (for TY 2025) | Miss. Code Ann. § 27-7-41 |85| Extension | Automatic 6-month with federal extension | MSDOR policy |86| Estimated tax threshold | $200 expected liability after withholding and credits | Miss. Code Ann. § 27-7-320 |8788---8990## Section 3: How this skill works with the federal return9192Mississippi taxable income is computed independently from the federal return — Mississippi does NOT start from federal AGI. Instead:93941. **Report all income** — Wages, self-employment income, interest, dividends, capital gains, rental income, etc. are reported directly on Form 80-105 and supporting schedules.952. **Adjustments** — Mississippi allows its own adjustments (e.g., deduction for 50% of self-employment tax, contributions to MS retirement plans).963. **Deductions** — Apply the Mississippi standard deduction OR Mississippi itemized deductions.974. **Personal exemptions** — Subtract personal exemptions ($6,000 single, $12,000 MFJ, etc.).985. **Mississippi taxable income** — Gross income − adjustments − deductions − exemptions.996. **Tax** — 0% on first $10,000; 4.4% on excess (TY 2025).1007. **Credits** — Apply applicable credits.101102**Key difference:** Mississippi is a "separate computation" state. It does NOT piggyback on federal AGI or federal taxable income. The taxpayer must independently compute Mississippi income.103104---105106## Section 4: Self-employed specific rules1071081. **Self-employment income** — Report net business income on Form 80-105 directly. Mississippi recognizes the same business income and expenses as the federal return in most cases, but the starting point is gross income, not federal AGI.1092. **Self-employment tax deduction** — Mississippi allows a deduction for 50% of self-employment tax paid, mirroring the federal deduction.1103. **Estimated taxes** — Self-employed taxpayers must make quarterly estimated payments if expected liability exceeds $200. Due dates: April 15, June 15, September 15, January 15.1114. **Business equipment depreciation** — Mississippi generally follows federal depreciation rules, including IRC § 179 expensing. Check conformity for bonus depreciation (IRC § 168(k)).1125. **Health insurance deduction** — Self-employed health insurance premiums are deductible for Mississippi purposes, consistent with the federal deduction.1136. **No local income tax** — Mississippi does not permit local income taxes.114115---116117## Section 5: Tier 1 rules — deterministic118119| Rule ID | Rule | Source |120|---|---|---|121| MS-T1-01 | Compute Mississippi gross income independently (do not start from federal AGI) | Miss. Code Ann. § 27-7-15 |122| MS-T1-02 | Apply 50% self-employment tax deduction | Miss. Code Ann. § 27-7-17 |123| MS-T1-03 | Apply standard deduction: $2,300 (single), $4,600 (MFJ), $3,400 (HoF) | Miss. Code Ann. § 27-7-17 |124| MS-T1-04 | Apply personal exemptions: $6,000 (single), $12,000 (MFJ), $8,000 (HoF) | Miss. Code Ann. § 27-7-21 |125| MS-T1-05 | Apply dependent exemptions: $1,500 per qualifying dependent | Miss. Code Ann. § 27-7-21 |126| MS-T1-06 | First $10,000 of taxable income: 0% | Miss. Code Ann. § 27-7-5 |127| MS-T1-07 | Taxable income over $10,000: 4.4% (TY 2025) / 4.0% (TY 2026) | Miss. Code Ann. § 27-7-5 |128| MS-T1-08 | Interest on U.S. government bonds: exempt from Mississippi tax | Miss. Code Ann. § 27-7-15 |129| MS-T1-09 | Social Security benefits: fully exempt from Mississippi tax | MSDOR guidance |130| MS-T1-10 | Mississippi does not tax retirement income from MS public retirement systems | Miss. Code Ann. § 27-7-15 |131132---133134## Section 6: Tier 2 rules — requires judgment135136| Rule ID | Rule | Guidance |137|---|---|---|138| MS-T2-01 | **Residency determination** — Mississippi uses a domicile test. A person domiciled in Mississippi or spending 183+ days in the state is a resident. | If taxpayer has homes in multiple states, flag for professional review. |139| MS-T2-02 | **Separate computation** — Mississippi does not start from federal AGI. Verify that all income items are independently reported on Form 80-105. | Cross-check against federal return to ensure nothing is missed. |140| MS-T2-03 | **Itemized deductions** — Mississippi allows itemized deductions similar to federal Schedule A but with Mississippi-specific limits. | Compare MS itemized vs. standard deduction to choose the better option. |141| MS-T2-04 | **Credit for taxes paid to other states** — Available to prevent double taxation on income earned in other states. | Requires the other state's return. |142| MS-T2-05 | **Income tax phase-out** — Rate drops annually (4.4% → 4.0% → 3.75% → ...) with potential full elimination. Confirm the applicable rate for the tax year. | Check MSDOR for the current-year rate before filing. |143| MS-T2-06 | **Bonus depreciation conformity** — Mississippi's conformity to IRC § 168(k) should be verified for the tax year. | Compare MS conformity date to asset placed-in-service date. |144145---146147## Section 7: Supplier pattern library148149| Pattern | Treatment | Notes |150|---|---|---|151| W-2 wages from Mississippi employer | MS withholding applies; report on Form 80-105 | Most common |152| Schedule C net profit (sole prop) | Report directly on Form 80-105 | Independent computation |153| Rental income | Report on Form 80-105 | MS-source if property in MS |154| Interest on U.S. government bonds | Exempt from Mississippi tax | Miss. Code Ann. § 27-7-15 |155| Interest on non-MS muni bonds | Taxable for MS purposes | Report as income |156| Social Security benefits | Fully exempt from Mississippi tax | Do not include |157| Capital gains from asset sale | Report on Form 80-105 | No special MS rate |158| 1099-NEC freelance income | Report directly on Form 80-105 | Estimated payments likely needed |159160---161162## Section 8: Form mapping163164| Mississippi form / schedule | What it covers | Federal counterpart |165|---|---|---|166| Form 80-105 | Resident Individual Income Tax Return | Form 1040 |167| Form 80-205 | Non-Resident / Part-Year Resident Return | Form 1040 |168| Form 80-106 | Individual Income Tax Adjustments | Schedule 1 (Form 1040) |169| Form 80-107 | Income Tax Credits Summary | N/A |170| Form 80-108 | Schedule of Deductions (Itemized) | Schedule A (Form 1040) |171| Form 80-320 | Estimated Tax Declaration | Form 1040-ES |172173---174175## Section 9: Refusal catalogue176177| ID | Situation | Action |178|---|---|---|179| MS-R-01 | Part-year or non-resident return (Form 80-205) | Refuse — out of scope |180| MS-R-02 | Corporate income tax (Form 83-100) | Refuse — out of scope |181| MS-R-03 | Corporate franchise tax | Refuse — out of scope |182| MS-R-04 | Multi-state income apportionment | Refuse — flag for professional review |183| MS-R-05 | Amended returns | Refuse — out of scope |184| MS-R-06 | Tax year other than current | Refuse — rates change annually during phase-out |185| MS-R-07 | Partnership / S-corp pass-through returns | Refuse — out of scope |186187---188189## Disclaimer190191This skill and its outputs are provided for informational and computational purposes only and do not constitute tax, legal, or financial advice. Open Accountants and its contributors accept no liability for any errors, omissions, or outcomes arising from the use of this skill. All outputs must be reviewed and signed off by a qualified professional before filing or acting upon.192193The most up-to-date, verified version of this skill is maintained at [openaccountants.com](https://openaccountants.com).194195---196197_Source: [OpenAccountants](https://openaccountants.com/skills/ms-income-tax) — open tax Guides for AI, reviewed by named CPAs/CAs/EAs. Quality: **source-cited draft**. For always-current figures and named-accountant backing, connect the OpenAccountants MCP server (`openaccountants-mcp`)._
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