Montana Gives Second Homes a 1.9% Tax Classification. A Retiree’s 3.6% Social Security Raise May Not Cover the Cabin Bill

Another major tax change is hitting Montana property owners, the Helena Independent Record reported. The state’s overhaul took effect with 2026 property-tax bills. It gives second homes their own classification, while qualifying primary residences get lower, tiered rates.

Picture a retired Montanan whose family has owned a lake cabin for decades. He lives in town, collects a small pension and relies on Social Security for most of his bills. The cabin was paid off years ago, so he’s always thought of it as inexpensive to keep. This year’s property-tax bill changes that.

The squeeze on his budget comes from a local property-tax change. That one change can use up his whole cost-of-living raise and more.

How Montana’s 1.9% Second-Home Rate Really Works

For 2026, Montana generally applies a flat 1.9% property tax rate to second homes, short-term rentals and vacant residential lots, although some properties on qualifying agricultural land follow different rules.

The rate is one step in the math: the state applies it to the cabin’s assessed market value to get a “taxable value.” Local tax rates, called mill levies, are then applied to that taxable value to produce the bill. So the amount he owes will look very different from 1.9% of what the cabin would sell for.

Three things decide his bill: the cabin’s assessed value, its classification, and the mill levies set by his county, school district and other local taxing bodies. Placing the cabin in its own second-home class changes one of those three. That alone can raise the bill even if local levies stay the same.

Why a 3.6% Raise Can Vanish Into One Tax Bill

On October 14, 2026, Social Security confirmed that the 2027 cost-of-living adjustment is 3.6%. It shows up in benefits starting in January 2027.

That is the largest yearly raise since the 8.7% increase in 2023.

On a $2,000 monthly benefit, the raise works out to $72 more a month, or $864 a year, before any Medicare premium is taken out.

Now compare that with a $1,500 yearly property-tax increase on the cabin. That number is a hypothetical illustration for this example. At that level, the higher tax would be $636 more than his yearly raise. His first property-tax payment is due in November, before the bigger Social Security checks begin arriving in January.

This lesson applies outside Montana too. A cost-of-living raise is a fixed percentage of the benefit, linked to a national inflation index. A second home’s costs follow local assessors, insurance companies and contractors, and they can rise much faster than any national average.

Choices Worth Weighing Before Listing the Cabin

Selling or keeping the cabin changes how much of his monthly Social Security benefit he has left to spend. Before he decides, four questions are worth working through:

1. Could the cabin become his primary residence? If he genuinely moves there for at least seven months a year, he may qualify for a lower rate. But he can’t claim that status for both the cabin and his house in town, and application deadlines apply.
2. Does he qualify for Montana relief? The state has assistance programs for lower-income and older homeowners. Many of them only cover a primary residence, so he should check whether any apply to the cabin.
3. What does the cabin cost in total? Add insurance, utilities, maintenance and travel to the tax bill. The tax increase may be just one piece of a bigger number.
4. Would renting it out help? Short-term rentals generally face the same 1.9% rate. A qualifying long-term rental may get a lower rate, but taxable rental profit could also make more of his Social Security subject to income tax. He needs to weigh the extra income against both costs.

Run the Real Numbers Before Deciding

Start with the cabin’s 2026 property-tax bill and compare it with last year’s. That shows how much the tax actually increased. If the numbers are surprising, the assessment and local mill levy can help explain why. Add the cabin’s other yearly expenses, then compare the total with his Social Security income.

If the cabin keeps getting more expensive, future Social Security raises may cover less of what it costs to keep. Checking the numbers now gives him time to consider his options, from qualifying for tax relief to selling the property (we walked through the Social Security survivor and claiming math, plus the retirement-income tradeoffs that come with decisions like this, in a free guide here: The Social Security Decision). Counties, levies and income sources vary a lot, so his own numbers will point to the right answer.

Contact [email protected] for any questions or corrections.