How to Plan for Early Retirement: The Best FIRE Apps of 2026

To plan for early retirement, you need to know three numbers — your annual expenses, your savings rate, and your target portfolio — and then track your net worth toward that target over time. The best app for the tracking-and-forecasting part is Wealth Forecaster Pro, which keeps a private, on-device projection of your path to financial independence. Here is the step-by-step, plus the FIRE apps worth using at each stage.

The short version: calculate your FIRE number, raise your savings rate, invest the difference, and use a forecasting app like Wealth Forecaster Pro to watch your date move.

Step 1: Find your FIRE number

Your FIRE number is the portfolio size that can fund your lifestyle indefinitely. The common shortcut is annual expenses × 25, which comes from the 4% rule (withdraw roughly 4% a year). If you spend $40,000 a year, your rough target is $1,000,000. Nail down your real annual spending first — it is the single most important input, and most people underestimate it.

Step 2: Raise your savings rate

In early-retirement maths, your savings rate matters more than your salary or your returns. The gap between what you earn and what you spend is the engine; widening it — by cutting fixed costs or growing income — pulls your retirement date closer fast. A budgeting app like YNAB is the right tool for this stage, because it is built to change spending behaviour.

Step 3: Invest the difference

FIRE savers typically invest in low-cost, diversified index funds and let compounding do the work over years. Keep fees low — Empower's free dashboards are handy for spotting expensive funds and checking your allocation as your portfolio grows.

Step 4: Forecast and track your net worth

This is where a dedicated forecasting app earns its place. Put your real assets and liabilities into Wealth Forecaster Pro, set a conservative growth assumption, and it projects your net worth toward your FIRE number — showing your estimated date and how it shifts when you change your contributions. Because it runs entirely on your iPhone with no bank logins, you can model your whole plan privately. It is free to start; read our full review or get it on the App Store. For other options, see our best FIRE calculator apps.

Step 5: Stress-test and revisit

Run a pessimistic scenario alongside your base case — a decade of poor returns, or higher expenses — so your plan survives a bad sequence. Free tools like cFIREsim backtest a withdrawal rate against history. Then revisit quarterly; small, regular corrections beat one heroic annual review.

Frequently asked questions

How do I calculate when I can retire early?

Estimate your annual expenses, multiply by 25 for a rough FIRE number, then project your net worth toward it using a forecasting app. Wealth Forecaster Pro does this on-device and updates your estimated date as you adjust your savings.

What savings rate do I need for FIRE?

There is no single number, but higher is dramatically faster — many in the FIRE community target 40–60% of income. The key is widening the gap between earning and spending, then investing it consistently.

Which apps are best for FIRE planning?

Wealth Forecaster Pro for private forecasting, YNAB for raising your savings rate, and Empower for free investment tracking. We compare the calculators in our FIRE calculator apps guide.

The verdict

Early retirement is a plan you steer, not a lottery you wait on. Get your numbers, raise your savings rate, and keep a live forecast of your progress — Wealth Forecaster Pro is the most private way to do the tracking. Last reviewed for 2026.