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Updated 2025 Tax Year

St. Tammany County
Property Tax Guide

Everything you need to know about property taxes in St. Tammany County, LA. Rates, due dates, exemptions, and how it affects your monthly payment.

10 Official Sources
8 min read
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Quick Facts
Tax Rate
0.8% to 1.2% of assessed value, varies by taxing district combination
1st Due
Dec 31
Exemptions
5+ Available
Section 1

How Property Tax Works

St. Tammany Parish operates under Louisiana's property tax system, where property taxes fund essential local services including schools, fire protection, libraries, and parish operations. The parish uses an assessed value system based on fair market value, with taxes calculated on the assessed value after applicable credits are applied.

Property tax rates in St. Tammany Parish vary significantly by location within the parish due to multiple special taxing districts, including school districts, fire protection districts, and municipal boundaries. The effective tax rate typically ranges from approximately 0.8% to 1.2% of assessed value, depending on your specific location and the combination of taxing authorities that serve your property. Rates are set annually by each taxing authority and can change from year to year based on budget requirements and voter-approved millages.

Section 2

What Makes Up Your Tax Bill

ComponentRate (per $1,000)Description
Parish General FundVariesBasic parish services and operations
School BoardVariesSt. Tammany Parish School Board operations
School BondsVariesVoter-approved school construction bonds
Fire Protection DistrictsVariesDistrict-specific fire protection services
Library DistrictVariesParish library system funding
Municipal TaxesVariesCity/town taxes (if applicable)

Note: Specific rates for the current fiscal year are determined annually by each taxing authority. The 2025 tax rates have not yet been finalized. Rates vary significantly based on your property's location within specific fire districts, school zones, and municipal boundaries. Contact the St. Tammany Parish Assessor's Office for current rates applicable to your specific address.

Section 3

When Are Property Taxes Due?

For the 2025/2026 tax year in St. Tammany County, property taxes are due in two installments:

First Installment
Dec 31
Delinquent after Dec 10
Pro tip: If you pay through mortgage escrow, your lender splits these payments across your monthly mortgage. If you pay directly, set calendar reminders to avoid late penalties.
Section 4

Supplemental Tax Bills

Supplemental taxes in St. Tammany Parish are additional tax bills issued when property changes hands or when new construction is completed after the annual assessment date. These taxes cover the difference between the previous assessment and the new assessed value for the remaining portion of the tax year.

Supplemental taxes are calculated by determining the difference between the old and new assessed values, then applying the current tax rate to that difference, prorated for the remaining months in the tax year. For example, if a $400,000 home is purchased in June that was previously assessed at $300,000, a supplemental tax bill would be issued for the $100,000 difference in assessed value, calculated from the date of ownership change through December 31st.

Example Calculation

Example 1: $300,000 Home

  • Assessed Value: $300,000
  • Homestead Exemption Applied: -$7,500 (first $75,000 @ 10%)
  • Net Taxable Value: $292,500
  • Estimated Tax Rate: 85 mills ($85 per $1,000)
  • Annual Tax: $2,486
  • Monthly Escrow: $207

Example 2: $600,000 Home

  • Assessed Value: $600,000
  • Homestead Exemption Applied: -$7,500
  • Net Taxable Value: $592,500
  • Estimated Tax Rate: 85 mills
  • Annual Tax: $5,036
  • Monthly Escrow: $420

Example 3: $1,000,000 Home

  • Assessed Value: $1,000,000
  • Homestead Exemption Applied: -$7,500
  • Net Taxable Value: $992,500
  • Estimated Tax Rate: 85 mills
  • Annual Tax: $8,436
  • Monthly Escrow: $703

Note: Examples use estimated average rates. Actual rates vary by location. Homestead exemption requires application and caps annual assessment increases.

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Section 5

Escrow & Property Taxes

Most mortgage lenders in St. Tammany Parish require property tax escrow accounts, collecting 1/12th of your estimated annual tax bill with each monthly mortgage payment. Lenders typically collect an initial escrow deposit at closing covering several months of taxes to ensure adequate funds are available when tax bills are due.

Property taxes in St. Tammany Parish become due November 15th each year and become delinquent December 31st. Lenders usually pay taxes in late November or early December from your escrow account. Your lender will provide an annual escrow analysis showing tax payments made and any adjustments needed to your monthly escrow amount. You can verify tax payments were made correctly by checking with the St. Tammany Parish Sheriff's Office, which handles tax collection.

How HonestCasa Helps
  • Understand whether your escrow is set correctly
  • See how rising taxes will change your monthly payment
  • Plan ahead instead of being surprised by "shortage" letters
Section 6

Frequently Asked Questions

When are property taxes due in St. Tammany Parish? Property taxes are due November 15th each year and become delinquent December 31st. For Fire Protection District No. 11, taxes are specifically due by December 31st.

What homestead exemption is available and do I need to apply? Louisiana offers a homestead exemption that caps annual assessment increases and provides some tax reduction. You must apply for this exemption - it is not automatic. Contact the St. Tammany Parish Assessor's Office for application forms and deadlines.

Are there other tax credits available? Yes, Louisiana offers various tax credits including those for seniors, disabled veterans, and other qualifying situations. All credits require separate applications and have specific eligibility requirements and deadlines.

How often are properties reassessed? Louisiana requires property reassessment every four years, though market changes and improvements can trigger interim assessments.

Can I appeal my property assessment? Yes, you can appeal your assessment to the St. Tammany Parish Assessor's Office and subsequently to the Louisiana Tax Commission if needed. Specific deadlines apply for filing appeals.

What happens if I pay my taxes late? Taxes become delinquent December 31st, after which penalties and interest begin accruing. Extended delinquency can result in tax sale proceedings.

Can I pay my property taxes online? Yes, St. Tammany Parish typically offers online payment options through the Sheriff's Office website. Contact their office for current payment methods and any associated fees.

Why do tax rates vary within the parish? St. Tammany Parish contains multiple special taxing districts (fire districts, school zones, municipal boundaries) that each levy their own taxes. Your total rate depends on which combination of districts serves your property.

Verified Sources

Backed by 10 Official Government Sources

Every fact in this guide is sourced from official county, state, and federal documents.

01
st. tammany parish sheriff's officeapp.lla.state.la.us
02
St. Tammany Parish Sheriffapp.lla.state.la.us
03
Tax Doc
Parish & Municipality Tax Tabletaxes.mfn.dps.la.gov
04
St. Tammany Parish Assessorapp.lla.state.la.us
05
St. Tammany Parish Fire Protection District No. 11app.lla.state.la.us
06
Revenue Information Bulletin No. 23-026 October 6, 2023 ...dam.ldr.la.gov
07
ST. TAMMANY, LOUISIANAsttammany.gov
08
HLS 243ES-15legis.la.gov
09
Tax Doc
Louisiana Tax Commissionstax.latax.la.gov
10
Exhibitsec.gov
All sources verified as of 2025 Tax Year

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