Taxable value and the inflation-or-5% limit

Michigan’s limit does not apply to a value on your notice. It applies to taxable value, and taxable value is calculated from last year’s taxable value by a formula with four terms in it. That is why a Michigan assessment can rise by more than the headline percentage without anything being wrong.

The formula, term by term

The county states it as capped value = (prior taxable value − losses) × inflation rate multiplier + additions, and each term does something different:

• Prior taxable value — last year’s figure, not the state equalized value. A property whose taxable value has drifted well below its SEV stays there.
• Losses — value that has come off the property (demolition, removal) is subtracted before the multiplier is applied, so the limit is not charged on value that no longer exists.
• The inflation rate multiplier (IRM) — the year’s inflation change, and it cannot be greater than 1.05. That ceiling is what makes the rule “inflation or 5%, whichever is less”.
• Additions — new value added to the property, added after the multiplier is applied so that a new building is not itself multiplied.

Why an addition is only half added

This is the detail that makes the arithmetic look wrong at first. Additions enter the formula at assessed value, and Michigan’s assessed value is half of true cash value. A $40,000 garage therefore enters the capped value as $20,000 — visible in the county’s own worked example, which adds 50% of the addition’s true cash value for exactly this reason.

Taxable value is the lesser of two figures

Once the capped value is calculated, taxable value is the lesser of the state equalized value or the capped value. So the formula can only hold the tax base down, never raise it: if the SEV falls below the capped value, the SEV is what you are taxed on. The exception is a transfer of ownership, which is covered on the uncapping page.

Where the state equalized value comes from

The SEV side of that comparison is not an appraiser’s visit. It comes from a sales study — Michigan uses a 24-month study when markets are increasing, with the timeframe set by the State Tax Commission — and county and state equalization then correct a local unit’s assessment level toward the required 50% of true cash value. A rising market therefore shows up on this side of the comparison first.

The practical consequence: in a rising market your SEV can climb a long way while your taxable value stays under the cap, and your bill does not follow the SEV at all. It moves when the cap moves.

What this does not cover

The multiplier for the current year is not published here. It is issued by the State Tax Commission in a bulletin this site cannot read, so the rule is stated with its ceiling and the number is left to your notice and to the state’s own publication. Where the inflation leg is the lower one, that number is the one that applies to you.

Nor does it cover the exempt transfers that keep a taxable value capped. That list is statutory, and the statute text could not be read from this site; the uncapping page states the rule and says where its statement of it comes from.

Where to go next

• Uncapping on a transfer of ownership — the one event that removes the limitation entirely.
• The notice of assessment — the line on it that says whether a transfer occurred.
• The appeal route — where a classification, equity or value dispute is heard.
• Michigan property tax deadlines — Tax Day, the notice and the filing windows.