About 이자로 투자 원금 계산 및 역산기
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
