이자로 투자 원금 계산 및 역산기

Name: 이자로 투자 원금 계산 및 역산기
Author: sosone

Android app by sosone. Finance · sosone

Store rating: Unknown
Store rating count: Unknown
Download price: Free to download
In-app purchases: Not listed in captured metadata
Version: 1.0.0
Listing last refreshed: 2026-09-18

Store description excerpt

This is a retirement fund calculator packed with only the essential features for those dreaming of Financial Freedom (FIRE). Solve the question, "How much do I need to save to receive this much interest every month?" with just a single input. It automatically reflects interest income tax of up to 15.4%, displaying pre-tax and post-tax amounts at a glance. ** Key Features - Two-way Instant Calculation: Check 'Required Investment Principal' based on 'Desired Monthly Interest', and reverse calculate 'Monthly Interest to be Received' based on 'Investment Principal' - Automatic Pre- and Post-Tax Breakdown: Automatically calculates interest income tax at 15.4% (14% Income Tax + 1.4% Local Income Tax) and displays pre-tax interest, tax, and post-tax interest all at once - Annual Interest Rate Presets: Quick selection of 3%, 5%, 9%, 15%, and 20%, along with fine-tuning buttons for ±0.1% and ±1% - Quick Amount Input: Easily input amounts using presets ranging from +100,000 to +10 million KRW - Investment Style Guide: Provides text for investment style levels, ranging from safe savings deposits to index-tracking ETFs, based on the entered annual interest rate - Korean Amount Display: Converts large amounts into an easy-to-read format like '○ billion ○ million KRW' - Calculation History: Automatically saves and retrieves recent calculation results - Data Backup: Supports full data backup and restoration Recommended for: - Economical For those planning retirement funds with the goal of FIRE - For those who want to quickly know the investment principal required to receive the desired monthly interest - For those who want to check in advance the monthly interest they will receive from their accumulated investment principal - For those who want to accurately calculate the difference between pre-tax and post-tax interest Accurate Calculation Formula Required Investment Principal = Pre-tax Monthly Interest × 12 ÷ Annual Interest Rate Post-tax Monthly Interest = Pre-tax Monthly Interest × (1 − 15.4%) Automatic Calculation

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