Compound Interest Pro vs ふるさと納税ナビ

Compound Interest Professional is a highly precise asset management simulator that lets you calculate savings contributions, withdrawals, goal achievement, required rates, and more. It visualizes your future asset growth with graphs and tables, so you can track principal, interest, and balances for each period. Key Features 1. Future Value Calculator Enter your initial principal, regular contributions, and interest rate to project your total future assets. Add a withdrawal amount to simulate scenarios where you draw down principal while continuing to invest. 2. Contribution/Withdrawal Calculator Figure out how much to save monthly (or annually) to hit your target—or how much you can withdraw each period. 3. Time to Goal Calculator Calculate how many years it will take to reach your goal based on your contribution amount and interest rate. Supports withdrawal scenarios too. 4. Required Rate Calculator Find the annual return rate needed to achieve your target amount. Features - Results are visualized with graphs and tables, so you can easily check details by period. - Supports annual/monthly compounding, as well as accumulation and withdrawals. - High-precision decimal calculations minimize errors. Flexible and Accurate • Professional-grade precision using high-accuracy decimal maths — no rounding errors. • Choose between yearly or monthly compounding and contribution frequencies. • Instant recalculation: change any figure and the results update immediately. • No registration, no ads, no tracking — your data stays on your device. Use Cases - Roth IRA, traditional IRA, and SEP IRA contribution planning - 401(k) and employer match optimization - HSA triple tax advantage projections - 529 plan for education savings (state tax benefits) - Roth conversion ladder for early retirees (FIRE) - High-yield savings account (HYSA) comparison - CD ladder strategies and Treasury planning - Mortgage payoff vs investment decision modeling - DCA into ETFs, index funds, or REITs - 4% rule and safe withdrawal rate scenarios An asset management tool to accurately and simply experience the full power of compound interest. Example Scenarios “If I invest $500 per month for 20 years at 6%, how much will I have?” “How much can I withdraw monthly from $300,000 at 4% for 15 years?” “What rate do I need to reach $1M in 25 years?” “How long will my savings last if I withdraw $2,000 monthly?” "If I max out my Roth IRA ($7,000) annually for 30 years at 7%, how much at age 65?" "If I contribute $1,000/month to my 401(k) with 50% employer match, what's the balance at retirement?" "If I open a 529 plan with $200/month for 18 years, how much for college?" "How long will my HYSA last withdrawing $3,000/month at 4.5% APY?" "What's the safe withdrawal rate from $1M to last 30 years?" 《 About Using the App 》 You may use this service only if you agree to the Terms of Service. The moment you start using the app, a service agreement is established between you and our company. If you're a minor, please use this service only with the consent of your parent or legal guardian.Terms of Use: https://cicalc-74e14.web.app/en/info/#terms Privacy Policy: https://cicalc-74e14.web.app/en/privacy

ふるさと納税ナビは、控除上限額の計算から寄付のタイミング管理までをサポートする無料アプリです。「いくらまで使えるのか分からない」「年末に慌てて寄付してしまう」「控除枠を余らせた」——そんな悩みを解決します。 ■ 控除上限額を自動計算 年収・家族構成・社会保険料・住宅ローンなどを入力するだけで、総務省の計算式に基づく控除上限額の目安を自動で算出。計算の内訳（給与所得・課税所得・所得税率・住民税所得割額）も確認できます。 ■ 毎月、最適なタイミングを通知 残り控除額と残り月数から「今月あと◯円使えます」を計算し、毎月1日にお知らせ。12月には締め切りアラートも届くので、枠の使い忘れや年末の駆け込みを防げます。 ■ 寄付の記録と管理 寄付した金額・日付・自治体・返礼品メモを記録。全国約1,740自治体をオフラインで検索して登録できます。年ごとに履歴・控除上限・残額を一覧で確認できます。 ■ ワンストップ特例にも対応 寄付先が5自治体を超えると警告（6自治体以上は確定申告が必要）。申請書の送付チェックや、申請期限（翌年1月10日必着）のリマインドにも対応しています。 ■ プライバシーに配慮 入力したデータはすべて端末内にのみ保存され、外部サーバーには送信されません。機種変更に備えたバックアップ書き出し（JSON）や、確定申告・記録用のCSV書き出しにも対応しています。 ■ こんな方におすすめ ・控除上限がいくらか知りたい方 ・計画的にふるさと納税をしたい方 ・複数の自治体に寄付してワンストップ特例を使う方 ・寄付の記録をきちんと残しておきたい方 ※ 表示する控除上限額は総務省が公開する計算式に基づく概算（目安）です。医療費控除など他の控除がある場合や、住宅ローン控除・申告方式によって、実際の控除額と異なることがあります。最終的な控除の可否・金額は寄付先自治体および税務署・自治体の判断によります。 ※ 本アプリは広告（Google AdMob）を表示します。