"Asset Tax Navi" Launches Fixed Asset Tax Self-Check Tool ── Instantly Determines Overpayment Risk in 3 Steps

March 30, 2026

Mycat releases a free tool to assess fixed asset tax overpayment risk.

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📰 Published: March 30, 2026 at 05:11

Mycat Co., Ltd. (Headquarters: Meguro-ku, Tokyo) has newly released a tool that allows users to self-check the risk of overpaying fixed asset tax through its AI Fixed Asset Tax Check Service "Shisanzei Navi" (https://shisanzei.xyz).

Tool URL: https://shisanzei.xyz/tools/self-check

Features of the Self-Check Tool

This tool allows individuals who are concerned about their fixed asset tax assessment to check for overpayment risk in 3 steps.

Step 1: Enter Property Information

Enter the land area, usage category, building structure, and year of construction.

Step 2: AI-estimated Valuation

Based on the entered information, AI estimates the fixed asset tax valuation. It displays the appropriate range expected from official land prices and the cost to rebuild the structure.

Step 3: Overpayment Risk Assessment

Compares the current tax amount with the estimated valuation and assesses the overpayment risk in three stages: "Low, Medium, High." If the risk is high, specific points to check (e.g., usage category, reflection of aging depreciation, area calculation) are provided.

Background of Release

A past survey conducted by the Ministry of Internal Affairs and Communications reported that some form of taxation error was confirmed in 97% of municipalities nationwide (Source: Ministry of Internal Affairs and Communications survey on fixed asset tax). While many taxation errors can be found by taxpayers themselves checking their tax statements, they are often overlooked without specialized knowledge. This tool was designed to highlight points to check even without expert knowledge.

Intended Use Cases

Those who question the amount on their annual tax notices.
Those checking the fixed asset tax amount for inherited property for the first time.
Those concerned if special provisions for residential land or depreciation due to aging are correctly applied.

* This service is not tax consultation. If you have any doubts about the content of your fixed asset tax assessment, please consult with your local government office or a tax accountant.

▼ Details of this matter

https://shisanzei.xyz/news/self-check-tool

■ Company Overview

Company Name: Mycat Co., Ltd.

Established: February 5, 2025

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

Business Activities: Planning, development, and operation of services for SMEs and individuals utilizing AI.