Mobile County, home to Mobile and 420k Alabamians, operates under Alabama\'s constitutional Class III property tax system. Owner-occupied residential property is **Class III**, assessed at 10% of fair market value (vs. Class II non-residential at 20%, Class I utility at 30%). Tax = AV × millage / 1,000. Combined millage includes state (6.5 mills statewide), county, city, school district, and special district levies. Alabama has the **second-LOWEST effective property tax rates in the United States** after Hawaii — typically ~0.37-0.50% statewide median. The constitutional 10% AR is the structural reason. A statewide 7% cap on annual increase in taxable AV (Class II + III) limits taxable value growth.
How the bill is built
Alabama property tax follows a 4-step calculation. Step 1: Fair Market Value. The Mobile County Alabama Revenue Commissioner determines FMV annually. Step 2: Apply Class III 10% AR. AV = FMV × 10%. So a $200K home has AV = $20K. Step 3: Apply homestead exemption tier. H-1 (under-65 standard): $4,000 AV reduction from STATE portion (~6.5 mills) only. H-2 (65+ with AL AGI ≤ $12K combined OR legally blind): exempts state and county portions, plus first $5K AV from school. H-3 (65+ with federal taxable income ≤ $12K combined OR retired due to permanent total disability): TOTALLY EXEMPT from ALL ad valorem. H-4 (65+ regardless of income): exempts STATE portion only. Step 4: Apply tax rate. Tax = (AV − exemptions) × millage / 1,000. Mobile County\'s combined millage is ~45 mills (= ~0.45% effective rate against full FMV after the 10% AR).
2026 Mobile County rate breakdown (consolidated millage per $1,000 of AV (Class III 10% AR × FMV), Mobile district)
| Taxing entity | Rate |
|---|---|
| Combined consolidated millage (Class III 10% AR, ~45 mills × 10% AR = ~0.45% effective) | 45.0000 |
| Combined total | 45.0000 |
As of April 26, 2026 · From Mobile County Alabama Revenue Commissioner.
Deductions and exemptions for 2026
Alabama homeowner property tax relief is concentrated in three mechanisms: (1) the constitutional Class III 10% AR for owner-occupied residential (applied automatically — the structural reason for Alabama\'s second-lowest US effective rates), (2) the 4-tier homestead exemption (H-1 / H-2 / H-3 / H-4 — including H-3 TOTAL EXEMPTION for low-income seniors and totally disabled), and (3) the FULL Disabled Veteran Exemption for 100% service-connected disabled vets. Alabama also has a statewide 7% cap on annual taxable AV increase.
Constitutional Class III 10% Assessment Ratio
Alabama\'s constitutional Class III 10% AR (Amendment 325, 1972) for owner-occupied residential property is the structural reason for the state\'s second-lowest US effective property tax rates. AV = FMV × 10%. So a $200K home has AV = $20K. Class II non-residential is taxed at 20% AR; Class I utility at 30%. The 10% AR is automatic for owner-occupied residential — no application required for the AR itself (though homestead exemptions require application).
4-Tier Homestead Exemption (H-1 / H-2 / H-3 / H-4)
Alabama\'s 4-tier homestead exemption (Code of Alabama §40-9-19/21) is unusually granular:
- H-1 (Standard, under-65): $4,000 AV reduction from STATE portion only (~6.5 mills). Counties may add up to $4,000 AV reduction from county portion.
- H-2 (65+ with AL AGI ≤ $12K combined OR legally blind): Exempts state and county portions, plus first $5,000 AV from school portion. Annual recertification required.
- H-3 (65+ with federal taxable income ≤ $12K combined OR retired due to permanent total disability): TOTALLY EXEMPT from ALL ad valorem taxes (state, county, city, school). Annual recertification required for income-tested status.
- H-4 (65+ regardless of income): Exempts STATE portion only. One-time application.
The income tests use different bases (H-2 uses Alabama AGI; H-3 uses federal taxable income), so seniors should review both tiers with the County Tax Assessor / Revenue Commissioner. Combined with Alabama\'s already-low effective rates, qualifying H-3 seniors pay $0 in property tax.
Full Disabled Veteran Exemption (100% Service-Connected)
Alabama provides a FULL property tax exemption from ALL ad valorem taxes for veterans rated 100% service-connected disabled OR who qualify for specially-adapted housing through the VA (Code of Alabama §40-9-21, per the 1980 amendment). The exemption applies to the homestead (single-family owner-occupied home + up to 160 acres). Surviving unremarried spouses retain if continued residency. Apply with County Tax Assessor / Revenue Commissioner with DD-214 + VA rating decision. Annual reapplication required.
Statewide 7% Taxable AV Cap
Alabama law caps annual increases in taxable AV (Class II + III) at 7% — automatic, no application required. This limits taxable value growth even when fair market values rise faster. Combined with Alabama\'s already-low effective rates, the 7% cap provides additional structural protection against tax-bill spikes during rapid market appreciation.
Appealing your assessment
Alabama property tax appeals follow a 3-tier process. Level 1: County Tax Assessor / Revenue Commissioner. File written appeal within 30 days of receiving the assessment notice (Alabama uses an October 1 lien date — assessment notices typically mailed in late spring/early summer). The Assessor reviews and may adjust. Level 2: County Board of Equalization. If denied, appeal to the County Board within 30 days. The Board holds quasi-judicial hearings — present comparable sales, recent appraisals, or condition documentation. Level 3: Alabama Circuit Court. Board decisions can be appealed to Circuit Court within 30 days. Most Alabama appeals are resolved at Level 1 or Level 2.