Reassessment
Reassessment is a revision of a property's assessed value.
In Minnesota, assessors value property annually, with physical inspection on a rotating cycle rather than every year. So every property is reassessed each year whether or not anything about it changed.
What moves the figure#
The market. Recent comparable sales in the area, which is the largest driver on most residential property.
A sale of the property itself, reported through the eCRV — the electronic Certificate of Real Estate Value filed when Minnesota property sells for more than $3,000. That is the mechanism by which sale prices reach assessors, and it is why eCRV accuracy matters beyond the individual transaction.
Improvements, where permitted work is reported.
A classification change — homestead to non-homestead, agricultural to residential — which changes the rate rather than the value but changes the bill either way.
Minnesota does not reset on sale#
Worth stating, because it differs from states where a purchase triggers a reassessment to the sale price.
Minnesota values annually against the market. A sale is evidence feeding that analysis rather than an event that resets the figure.
The practical consequence for a buyer is that the tax bill is not automatically recalculated to their purchase price — but nor is it frozen, and a sale substantially above prior assessments in the area will inform the next cycle.
Sales ratio studies#
The check on whether reassessment is working.
The Department of Revenue publishes annual sales ratio studies comparing assessed values against actual sale prices, by county and property class, built from eCRV data.
Where assessments in a jurisdiction are systematically out of line, the state can act to bring them into range. It is a public, independent measure of assessment accuracy, and it is free to read.
Unpermitted work#
A quiet risk.
Permitted improvements reach the assessor. Unpermitted ones frequently do not — until they are discovered, at which point the assessor may be entitled to look back.
The larger problem with unpermitted work is not the tax. It is that a missing certificate of occupancy or an unpermitted conversion surfaces at the next sale, and resolving it retrospectively means bringing the work to current code.
Watch the spring notice#
The Notice of Valuation and Classification states the new figure and the classification, and every appeal deadline runs from it.
Where a reassessment moves substantially, that notice is the moment to act — by checking the assessor's record for factual errors first, since square footage and room counts are wrong more often than anyone expects, and correcting a record error is easier than arguing about value.