Kenai Peninsula Borough Property Tax: Exemptions, Deadlines, and Appeals

Property tax in the Kenai Peninsula Borough is calculated by taking your property’s assessed value as of January 1, subtracting any exemptions you qualify for, and multiplying the remainder by the combined mill rate for your location. Bills are paid in two installments, due September 15 and November 15, and the exemptions that save the most money all have a February 15 application deadline.

How Your Tax Bill Is Calculated

The Assessing Department sets a value for every taxable parcel as of January 1 and mails assessment notices around March 1.¹ That number, minus exemptions, is your taxable value.

The mill rate is where location matters. One mill equals one dollar of tax per $1,000 of taxable value.² The borough levies a rate across the whole borough, and individual service areas and cities add their own rates for things like hospitals, roads, and fire protection. Two identical houses in different parts of the borough can owe noticeably different amounts. Current rates for every service area are posted on the borough’s website.³

The math is simple once you have both numbers. Divide taxable value by 1,000, multiply by the combined mill rate. A $250,000 taxable value at a combined 12 mills is $3,000 in tax.

Exemptions That Lower What You Owe

Three exemption programs do most of the heavy lifting for individual property owners. Each has its own rules, and the deadlines are strict.

Senior Citizen and Disabled Veteran Exemption

Alaska law exempts the first $150,000 of assessed value on a primary residence for qualifying seniors, disabled veterans, and certain surviving spouses.⁴ The Kenai Peninsula Borough goes further for seniors, exempting up to $300,000 of assessed value.⁵

To qualify as a senior, you must be 65 or older. Surviving spouses age 60 or older of someone who previously qualified also remain eligible.⁴ For disabled veterans, the threshold is a service-connected disability rated at 50 percent or more, not 100 percent as many people assume.⁵ In either case, you must own and occupy the home as your primary residence for at least 185 days per year.

Applications are due to the Assessing Department by February 15 of the tax year. Once you’re approved, you don’t normally reapply as long as your ownership, residency, and disability status don’t change. Late applications can be accepted through March 31 with a signed affidavit showing good cause.⁶

Residential Exemption

Homeowners who use a property as their primary residence can claim a residential exemption. Starting in 2026, it covers the first $75,000 of assessed value, up from $50,000 previously. Because the borough created a new, higher exemption rather than adjusting the old one, everyone has to submit a fresh application by February 15 to get the 2026 benefit, including people already enrolled under the old amount.

Farm Use Assessment

If you actively farm your land, you may qualify for a reduced assessment. You have to sell at least $2,500 in agricultural products from the land during the tax year and file an IRS Schedule F with your federal return.⁷ Qualifying activities include crop production, fruit growing, and livestock grazing for human consumption or animal sustenance.

Applications are due to the Assessing Department by May 15. If you don’t yet have farm income to show, you can file a declaration of intent certifying that you plan to file Schedule F for the current year, then provide the Schedule F to the assessor by April 15 of the following year. Missing that follow-up forfeits the classification. If a crop failure or physical injury keeps you under the $2,500 threshold in a given year, you keep the assessment as long as you qualified in the three preceding tax years.⁷

Boats and Aircraft

The borough taxes watercraft and aircraft as personal property, and this one catches a lot of owners off guard. Watercraft with a Coast Guard documentation number, Alaska DMV registration, or ADF&G number are taxed based on overall length. Aircraft with an FAA-issued N number are taxed on the manufacturer’s gross weight with internal load. The tax is a flat amount tied to size, not value, so a well-kept plane and a rough one of the same weight pay the same.⁸

All personal property owners have to file a property statement by February 15. Filing late or not at all adds a 10 percent penalty to the tax owed. The borough’s $100,000 business personal property exemption doesn’t apply to flat-taxed aircraft or watercraft. A boat stored or regularly used in the borough for 90 or more days in the 12 months before January 1 is taxable, even if its home port is elsewhere. Boats based outside the borough but brought in between September 1 and June 30 for storage, servicing, or repairs at a licensed boatyard can qualify for a limited exemption, but the application has to be in before February 1.⁸

Payment Deadlines and Methods

You can split the bill into two installments. The first half is due on or before September 15, the second half on or before November 15.¹ Miss the September 15 installment and you lose the right to pay in halves: the entire bill becomes due in full by October 15. Any portion of a tax can be paid at any time, but a partial payment won’t stop collection once an account is delinquent.

The borough accepts online payments through its web portal and by phone at 1-844-611-4024. eCheck payments carry no fee; credit cards come with a 2.35 percent processing fee.⁹ Mailed payments are honored by postmark date. If you haven’t received a bill, call the Finance Department’s Property Tax Division before the due date. Not receiving one doesn’t excuse a late payment.¹⁰

What Happens If You Pay Late

Penalties stack up quickly. A 5 percent penalty is added to the unpaid balance the day taxes go delinquent, and another 5 percent is added if the balance stays unpaid more than 30 days after that. Interest accrues at 10 percent per year from the original due date.¹

If taxes from the preceding year or earlier remain unpaid by the end of February, the borough files a petition for judgment and decree of foreclosure in Superior Court. From there you have a one-year redemption period to save the property by paying all taxes, penalties, interest, and costs in full. If the redemption period runs out, the property is deeded to the borough or the city where it sits.¹

Appealing Your Assessed Value

If the value on your assessment notice is too high, you have 30 days from the notice’s mailing date to file a written appeal with the Borough Clerk’s Office.¹¹ Because notices typically go out around March 1, real property appeals for 2026 are due by March 30, and appeals on boats, aircraft, and business accounts are due by April 13.¹²

The appeal has to include a specific estimate of what you think the property was worth as of January 1. A vague objection won’t do. The burden is on you to show an error with evidence: a recent independent appraisal, photographs of defects or damage not reflected in the assessment, closing statements from comparable sales, or a market analysis showing the borough’s number is out of line with local trends.

Your appeal goes to the Board of Equalization, which can adjust the valuation if you show the assessment is excessive, unequal, or improper.¹² One thing to keep in mind: filing an appeal doesn’t pause your obligation to pay. Taxes remain due on schedule while the appeal is pending, and if the board rules for you, you get a refund afterward.¹

1
Kenai Peninsula Borough. Frequently Asked Questions
2
City of Homer Alaska. Property Tax Mill Rates
3
Kenai Peninsula Borough. Mill Rates – Assessing Department
4
Justia Law. Alaska Statutes 29.45.030 – Required Exemptions
5
Kenai Peninsula Borough. Assessing Department – Exemptions and Deferments
6
Kenai Peninsula Borough. KPB Code 5.12.105 – Real Property Tax Exemptions
7
Alaska Department of Commerce, Community, and Economic Development. Farm Use Assessment Applications
8
Kenai Peninsula Borough. Personal and Business Property Assessments
9
Kenai Peninsula Borough. Pay Your Property Tax
10
Kenai Peninsula Borough. Property Tax Overview
11
Justia Law. Alaska Statutes 29.45.190 – Appeal
12
Kenai Peninsula Borough. Assessing Department – Appeals