Lake County, Indiana property taxes are due in two installments each year, on May 10 and November 10, and what you owe is your property’s assessed value, minus any deductions you qualify for, multiplied by your local tax rate, with a constitutional cap limiting the total to 1%, 2%, or 3% of gross assessed value depending on how the property is used. Indiana began reshaping its homestead deductions in 2025, so the amount coming off your assessed value is scheduled to change every year through 2030. The sections below walk through the calculation, the deductions, the deadlines, and what happens if you pay late or want to challenge the number.
How Your Tax Bill Is Calculated
Every property in Lake County is valued as of January 1 each year. The county assessor sets your property’s “market value-in-use,” meaning roughly what it would sell for in its current condition and use. You receive that figure on a Form 11, the Notice of Assessment of Land and Improvements, which assessors must send by February 10 or within 90 days of completing the appraisal, whichever comes first.1Department of Local Government Finance. 2025 Assessment Calendar
From there, the math is straightforward. The county auditor subtracts your approved deductions from the gross assessed value to get your net assessed value. That net figure is multiplied by the local tax rate, which is expressed in dollars per $100 of assessed value. At a rate of $8.50 per $100, a $150,000 net assessed value produces a gross tax of $12,750 before credits.
Rates vary by taxing district because different areas support different combinations of schools, townships, libraries, and special districts. Because every overlapping taxing unit sets its budget each year, your rate can shift even when your assessed value doesn’t.
The Caps That Limit What You Can Owe
Indiana’s constitution caps property tax at a percentage of gross assessed value, no matter what the rate calculation produces. The caps are 1% for a homestead (your primary residence), 2% for other residential property, agricultural land, and long-term care facilities, and 3% for commercial, industrial, and all other property.
If your calculated tax exceeds the cap, the auditor automatically applies a circuit breaker credit to bring you back under it. You don’t apply for this; it shows up as a line-item reduction on your bill.2Department of Local Government Finance. Fact Sheet – Circuit Breaker Caps On a homestead with a $200,000 gross assessed value, the ceiling for the year is $2,000. The caps carry real weight in Lake County, where some districts run relatively high rates.
Deductions You Have to Apply For
Deductions reduce your net assessed value before the tax rate is applied, and most of them require an application through the Lake County Auditor’s Office. The deadline is December 31 of the assessment year for the deduction to show up on the following year’s bill.3Lake County, IN Government. Instructions to File Property Deductions Once approved, most renew automatically unless your eligibility changes.
Standard Homestead Deduction
If you own and occupy a Lake County home as your primary residence, the standard homestead deduction lowers your assessed value. Indiana is phasing it out over five years. For the 2026 assessment date (taxes payable in 2027), the deduction is a flat $40,000. It then drops to $30,000 in 2027, $20,000 in 2028, $10,000 in 2029, and zero starting in 2030.4Indiana General Assembly. Indiana Code 6-1.1-12-37 – Standard Deduction for Homesteads The pre-2025 formula allowed up to 60% of assessed value or $48,000, whichever was less.5Department of Local Government Finance. Legislation Affecting Deductions, Exemptions, and Credits
Supplemental Homestead Deduction
Indiana is partially offsetting the shrinking standard deduction with a growing supplemental one. After the standard deduction comes off, the supplemental removes an additional percentage of what’s left. For taxes first due and payable in 2026, that percentage is 40%. It climbs to 46% in 2027, 52% in 2028, 57% in 2029, 62% in 2030, and 66.7% for 2031 and beyond. The supplemental deduction cannot exceed 75% of gross assessed value.6Indiana General Assembly. Indiana Code 6-1.1-12-37.5 – Supplemental Deduction for Homesteads
For most Lake County homeowners the combined 2026 deduction will be somewhat smaller than it was before 2025, with the supplemental doing more of the work each year as the standard phases out.
Over 65 Deduction
If you’re at least 65 by December 31 of the year before you claim it, you may qualify for an additional reduction on your primary residence. You have to meet the statute’s income and property value limits, and you generally can’t combine it with other deductions except the homestead and supplemental homestead. Surviving spouses at least 60 years old may also be eligible if the deceased spouse was 65 or older at the time of death and the surviving spouse hasn’t remarried.7Indiana General Assembly. Indiana Code 6-1.1-12-9 – Deduction for Person 65 or Older
Disabled Veteran Deductions
Indiana offers two deductions for veterans, and if you qualify for both you can claim both:
- A $24,960 deduction under IC 6-1.1-12-13 for veterans with wartime service who received an honorable discharge and have a VA disability rating of at least 10%. Surviving spouses of eligible veterans may also qualify.
- A $14,000 deduction under IC 6-1.1-12-14 for veterans with at least 90 days of honorable service who are either totally disabled or at least 62 with a 10% or higher VA disability rating. The home’s assessed value must be under $240,000.
Qualifying for both brings the combined reduction to $38,960.8Indiana Department of Veterans’ Affairs. Disabled Veteran Property Tax Deduction
The Mortgage Deduction Is Gone
Indiana’s mortgage deduction under IC 6-1.1-12-1 was eliminated starting with the 2023 assessment year (taxes payable in 2024).9Department of Local Government Finance. Special Message to Property Owner If you remember claiming it, or you see it mentioned on older pages, it no longer applies.
Payment Deadlines and How to Pay
Lake County property taxes are due in two installments: May 10 and November 10.10Department of Local Government Finance. Property Tax Due Dates Your spring statement shows both amounts. Each installment covers roughly half of your annual liability, with small variations possible when adjustments are applied.
The Lake County Treasurer’s Office accepts online payments by credit card or e-check through its tax search and payment portal.11Lake County Government. Treasurer Tax Search and Payment Electronic payments may carry a convenience fee from the processor. You can also pay by mail or in person at the Treasurer’s Office in Crown Point.
If You Pay Late or Not at All
Missing a deadline triggers penalties under Indiana Code 6-1.1-37-10. Paying within a short window after the due date brings a smaller penalty, but it escalates to 10% of the amount due if the delinquency persists.12Indiana General Assembly. Indiana Code 6-1.1-37-10 – Penalties for Delinquent Taxes Penalties are added by the county auditor and cannot be waived except through the limited settlement process in IC 6-1.1-37-15.
If taxes stay unpaid long enough, Lake County can sell the delinquent debt at public auction. The auditor publishes a list of eligible properties with the amounts owed and the sale terms. At auction, the winning bidder receives a tax lien certificate, not immediate ownership. The minimum bid covers all delinquent taxes, current-year taxes, penalties, and the county’s administrative costs; nothing can sell for less.13Indiana General Assembly. Indiana Code Title 6 Taxation 6-1.1-24-2
After the sale, you have one year to redeem the property.14Indiana General Assembly. Indiana Code 6-1.1-25-4 – Period for Redemption What that costs depends on when you act:
- Within six months of the sale: 110% of the minimum bid, plus 5% annual interest on any amount the buyer paid above the minimum bid, plus any subsequent taxes the buyer paid, with interest.
- After six months but within one year: 115% of the minimum bid, plus the same additional costs.
Properties on the county’s vacant and abandoned list carry no redemption right at all. If you don’t redeem within the allowed period, the certificate holder can petition for a tax deed, which transfers ownership.14Indiana General Assembly. Indiana Code 6-1.1-25-4 – Period for Redemption That’s the point of no return.
If You Disagree With Your Assessment
Challenge your value by filing a Form 130 (Taxpayer’s Notice to Initiate an Appeal) with the county assessor. The deadline depends on when the county mailed your Form 11: if it was mailed by April 30, you must file by June 15 of the assessment year; if it was mailed on or after May 1, you have until June 15 of the following year, when the tax bill is sent.1Department of Local Government Finance. 2025 Assessment Calendar
Once filed, the assessor schedules an informal conference. Bring evidence: a recent appraisal, comparable sales for similar nearby homes, or photographs of conditions the assessment may have missed. Many disputes end here. If the conference doesn’t resolve things, your appeal moves to the county’s Property Tax Assessment Board of Appeals (PTABOA), and from there you can escalate to the Indiana Board of Tax Review. The process takes time, so file early and organize your evidence while it’s still fresh.
When Your Mortgage Servicer Pays the Bill
Most homeowners with a mortgage don’t write a check to Lake County. The servicer collects a share of the estimated annual tax each month, holds it in escrow, and pays the county on your behalf at each deadline.
Federal law under RESPA requires servicers to analyze your escrow account every year and notify you of a surplus, shortage, or deficiency. A surplus of $50 or more must be refunded within 30 days. Larger shortages can be spread over at least 12 months.15eCFR. 12 CFR 1024.17 – Escrow Accounts
You’re still responsible for making sure the taxes actually get paid. If you suspect the servicer missed or paid late, send a written “notice of error.” The servicer has to acknowledge within five business days and correct the problem within 30 business days. If the servicer’s delay caused a penalty, federal rules put that cost on the servicer, not you. You can also file a complaint with the Consumer Financial Protection Bureau if the servicer doesn’t respond.
Deducting Property Taxes on Your Federal Return
If you itemize, you can deduct the property taxes you pay to Lake County. The IRS requires the tax to be based on assessed value and levied for the general public welfare. Special assessments that increase your property’s value, like sidewalk construction or sewer line installation, don’t qualify, and neither do flat service fees such as a set monthly trash charge.16Internal Revenue Service. Real Estate (Taxes, Mortgage Interest, Points, Other Property Expenses)
The federal SALT (state and local tax) deduction cap limits how much total state and local tax you can deduct. For 2026, the cap is $40,400 for most filers or $20,000 if you’re married filing separately. That limit covers all state and local taxes combined, including Indiana income tax and any personal property taxes, not just real estate. If your total exceeds the cap, you deduct up to the limit. The cap phases down for taxpayers with modified adjusted gross income above $500,000 and can drop as low as $10,000.