Property tax in Ascension Parish is calculated by taking your property’s fair market value, converting it to an assessed value (10% for a home, 15% for commercial property), subtracting any exemptions you qualify for, and applying the combined millage rate for your specific location, which runs roughly 100 to 120 mills for most residents. Bills go out in late fall and are due to the Ascension Parish Sheriff by December 31.1Ascension Parish Assessor. About Our Office Miss that deadline and interest starts running at 1% per month.
How Your Tax Bill Is Calculated
The Ascension Parish Assessor sets a fair market value for every taxable parcel, as required by the Louisiana Constitution. That market value is then multiplied by a fixed ratio to produce the assessed value your tax is actually based on:2Louisiana State Legislature. Louisiana Constitution Article VII Section 18 – Ad Valorem Taxes
- Residential land and improvements: 10% of fair market value
- Commercial and other non-residential property: 15% of fair market value
- Electric cooperative properties (excluding land): 15%
- Public service properties (excluding land): 25%
So a home worth $250,000 on the open market has an assessed value of $25,000. Millage rates apply to that $25,000, not the full purchase price. Every exemption and every appeal turns on this number.
Louisiana reassesses property at least every four years, and reassessment can push your value up.2Louisiana State Legislature. Louisiana Constitution Article VII Section 18 – Ad Valorem Taxes You’ll see the new number on the assessment notice the office mails in late summer. Don’t throw it away. That notice is the trigger for your appeal window.
Sample Calculation
For a $250,000 owner-occupied home in an unincorporated area with a combined millage around 115 mills:
- Fair market value: $250,000
- Assessed value at 10%: $25,000
- Homestead exemption: −$7,500
- Taxable assessed value: $17,500
- Tax bill (17,500 × 0.115): about $2,013
Millage Rates and What They Fund
There is no single parish-wide rate. Your total millage is a stack of levies from overlapping taxing bodies, so a homeowner in Prairieville, Gonzales, and Donaldsonville each pays a different total. Fire, drainage, lighting, and levee districts vary by location, and residents inside the incorporated cities pay municipal millages on top. Some newer subdivisions also carry a 15-mill road infrastructure district levy.
Schools dominate the bill. The combined school board levies (bonds, salaries, operations, facilities) run roughly 60 mills, which is more than half of most homeowners’ total.3Ascension Parish Assessor. 2025 Ascension Parish Millages The Law Enforcement District adds 14.48 mills, the Library 5.53 mills, and the Assessment District 1.78 mills. Fire, drainage, lighting, and levee levies fill in the rest depending on where your property sits. The assessor publishes the full millage table each year, and you can use it alongside your assessment notice to work out your exact number.
The Homestead Exemption
The single biggest way to cut your Ascension Parish tax bill is the homestead exemption, which shields the first $7,500 of assessed value on an owner-occupied primary residence.4Louisiana State Legislature. Louisiana Revised Statutes 47:1703 – Exemptions Because residential property is assessed at 10%, that $7,500 removes $75,000 of market value from taxation. On a modest home it can wipe out a large share of the bill. On a more expensive home it still saves hundreds a year.
You can only claim it on one property, and you have to actually live there. File the application with the Ascension Parish Assessor’s office and bring proof of residency, typically a Louisiana driver’s license showing the property address and a utility bill.5Ascension Parish Assessor. Homestead Exemption Once the signed application is on file, the exemption stays in effect as long as you own and occupy the home. If you bought recently and never applied, you’re paying more than you should.
Senior Freeze and Disabled Veteran Exemptions
Homeowners aged 65 or older who already have the homestead exemption can apply for the Special Assessment Level, commonly called the Senior Freeze. It locks in your assessed value so future reassessments won’t push it up. Millage rate increases can still raise your bill, but the value your millage is applied to won’t grow with the market.6Ascension Parish Assessor. Special Assessment Level Freeze
For 2026, combined adjusted gross income of all owners must not exceed $102,700, and starting with the 2026 tax year that threshold adjusts annually by the Consumer Price Index. A proposed constitutional amendment on the November 2026 ballot would raise the base to $150,000, but that is not current law. The freeze also extends to homeowners who are permanently and totally disabled at any age, under the same income cap.
Disabled veterans get additional relief stacked on top of the standard homestead exemption, scaled to their VA disability rating:7FindLaw. Louisiana Constitution of 1974 Art VII Sect 21
- 50% to 69% rating: an additional $2,500 of assessed value exempt (total $10,000)
- 70% to 99% rating: an additional $4,500 exempt (total $12,000)
- 100% disability or total unemployability: full assessed value exempt, no property tax on the home
Surviving spouses of veterans with a qualifying rating keep the same exemption as long as they own and occupy the property, whether or not it was in place before the veteran’s death.
Paying Your Bill
The Ascension Parish Sheriff collects the tax.8Louisiana State Legislature. Louisiana Revised Statutes 13:5539 – Sheriffs Duties Bills arrive in late fall and payment is due by December 31. You can pay in person, by mail, or through the sheriff’s online portal. Online credit and debit card payments carry a 3.45% convenience fee.9Ascension Parish Sheriff’s Office. Pay Property Taxes On a $2,000 bill that’s roughly $69 in surcharges, so a mailed check avoids the extra cost.
Anything unpaid after December 31 is delinquent. Interest accrues at 1% per month, non-compounding, from the day after the due date.10Justia Law. Louisiana Revised Statutes 47:2127 – Time for Payment That’s 12% a year, and any property with an outstanding balance is exposed to the annual tax lien auction.
What Happens If You Don’t Pay: Tax Lien Auctions
Starting January 1, 2026, Louisiana shifted from selling the property itself at tax sales to selling a tax lien certificate. A winning bidder doesn’t take your home. They hold a lien, and you still have a path to pay it off and keep the property.
The tax collector must advertise the auction by May 1 of the year following delinquency. Ascension Parish has scheduled its 2026 tax lien auction for June 24, 2026.9Ascension Parish Sheriff’s Office. Pay Property Taxes Bidders compete by offering the lowest monthly interest rate they’ll accept, with a floor of 0.7% per month. The lowest rate wins.11Justia Law. Louisiana Revised Statutes 47:2154 – Tax Lien Auctions Time of Auction Price
To clear the lien and hold onto your property, you have to pay what the lien buyer paid at auction, plus interest at the auction rate (capped at 1% per month), plus a 5% penalty, plus costs.12Louisiana State Legislature. Notice of Delinquency Tax Lien Holder Tax Lien Auction If the lien holder paid later years’ taxes for you, those amounts pile on with the same penalty and interest. Wait long enough without paying and the lien holder can petition a court to sell the property.
Appealing Your Assessment
If the assessor’s fair market value looks too high, you have a short window to push back. Assessment lists are open for public inspection for 15 calendar days, beginning no earlier than August 15 and ending no later than September 15 each year.13Justia Law. Louisiana Revised Statutes 47:1992 – Inspection of Assessment Lists The Ascension Parish Council sits as the Board of Review to hear complaints during and shortly after that window.
Your complaint must reach the board at least seven days before its public hearing. You can deliver it in person, by certified mail, or by fax, but it has to arrive by that seven-day mark. Miss it and you’ve waived your challenge for the year.
Bring evidence that the assessed market value exceeds the actual one. Recent comparable sales in your neighborhood carry the most weight. A professional appraisal is stronger evidence still. Photos of damage, deferred maintenance, or other conditions that reduce value help. Showing up empty-handed and saying “my taxes are too high” almost never works.
If the Board of Review rules against you, you can appeal to the Louisiana Tax Commission by filing Form 3103.A within 30 calendar days of receiving the board’s written decision.14Cornell Law Institute. Louisiana Administrative Code Title 61 V-3103 – Appeals to the Louisiana Tax Commission Beyond the commission, the courts are the next step, though most residential disputes end before then.
A Note for Business Owners
If you run a business in the parish, everything above about residential tax leaves out one obligation that hits you and not homeowners: you have to report your moveable business assets (furniture, fixtures, machinery, equipment, inventory) to the assessor each year on the LAT 5 form, typically mailed in February. The form is due by April 1 or 45 days after you receive it, whichever is later.15Cornell Law Institute. Louisiana Administrative Code Title 61 V-307 – Personal Property Report Forms Miss it and the assessor estimates the value, and you lose your right to appeal that estimate. Since commercial property is assessed at 15%, an inflated estimate can hurt.