"Shisanzei Navi" Releases 2027 Revaluation Impact Simulator: Instantly Estimate Tax Changes After Revision

March 29, 2026

Mycat has released a free simulator that allows users to estimate their fixed asset tax amount following the 2027 revaluation.

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📰 Published: March 29, 2026 at 21:24

Mycat Inc. (Headquarters: Meguro-ku, Tokyo) has launched a new simulator on its AI-powered fixed asset tax service, "Shisanzei Navi" (https://shisanzei.xyz), which allows users to estimate tax fluctuations resulting from the 2027 fixed asset tax revaluation.

Tool URL: https://shisanzei.xyz/tools/revaluation-simulator

Features of the Revaluation Impact Simulator

The assessed value, which serves as the tax base for fixed asset tax, is reviewed every three years through a "revaluation" process. The next revaluation year is 2027 (Reiwa 9).

With this tool, users can estimate tax changes after the revaluation simply by entering the following information:

Input Items

Property location (prefecture/municipality)
Land area and usage category
Building structure and age
Current fixed asset tax amount (as stated on the tax notice)

Output Content

Estimated fixed asset tax amount after revaluation
Increase/decrease amount and percentage compared to the current tax
Breakdown of primary factors for change (land price fluctuations, depreciation, etc.)
Confirmation of the application of special provisions for residential land

Background of the Release

According to a survey by the Ministry of Internal Affairs and Communications, errors in fixed asset tax assessments have been reported in 97% of municipalities (Source: Ministry of Internal Affairs and Communications, Survey on Tax Amount Corrections Related to Fixed Asset Tax and City Planning Tax).

Since the land price survey that serves as the basis for revaluation is conducted the year prior to the revaluation year, fiscal year 2026 is a critical preparation period. For property owners, this is an important time to verify whether their current assessed value is appropriate.

Who This Tool Is For

Property owners who want to understand in advance how their tax will change after the revaluation
Individuals who own multiple properties and want to estimate the total change in tax
Those who want to confirm if the special provisions for residential land are correctly applied

※ This service does not constitute tax consultation under the Certified Public Tax Accountant Act. For specific tax amount confirmation or requests for correction, please consult a tax accountant or other professional.

▼ Details of this announcement

https://shisanzei.xyz/news/revaluation-simulator

■ Company Overview

Company Name: Mycat Inc.

Established: February 5, 2025

Address: 2-7-22 Mita, Meguro-ku, Tokyo

Business Description: Planning, development, and operation of AI-powered services for SMEs and individuals