How to Plan for Retirement: A Step-by-Step Savings Guide

Your retirement number is the total savings you need to sustain your lifestyle without a paycheck. The most widely used approach is the 25x rule, which comes from the 4% withdrawal rate research. Multiply your desired annual spending in retirement by 25, and that is your savings target.

For example:

• $40,000/year spending: You need $1,000,000
• $60,000/year spending: You need $1,500,000
• $80,000/year spending: You need $2,000,000

This number assumes you withdraw 4% of your portfolio in the first year and adjust for inflation each year after. Historical data suggests this approach has a high probability of lasting 30 or more years. Your actual number may differ based on when you plan to retire, your expected Social Security or pension income, and your risk tolerance.

Start by estimating your current monthly expenses, subtract anything that will disappear in retirement (like commuting costs or mortgage payments), and add new expenses (like increased healthcare). Multiply the annual total by 25 to get your target.

Compound growth is the single most powerful force in retirement planning. When your investments earn returns, those returns get reinvested and start earning their own returns. Over decades, this compounding effect does more of the work than your actual contributions.

Consider two people who both want $1,000,000 by age 65, assuming a 7% average annual return:

• Starting at age 25 (40 years): Needs to save about $381 per month
• Starting at age 35 (30 years): Needs to save about $820 per month
• Starting at age 45 (20 years): Needs to save about $1,920 per month

The person who starts at 25 contributes about $183,000 total and compound growth provides the other $817,000. The person who starts at 45 contributes about $461,000 and compound growth provides only $539,000. Starting early means your money does more work than you do.

Once you know your retirement number and timeline, you can work backward to find the right monthly contribution. A retirement savings calculator makes this straightforward by factoring in your current savings, expected return rate, and years until retirement.

General guidelines for how much of your income to save:

• 15% of gross income is the most commonly recommended target, including any employer match
• 20% or more is ideal if you started late or want to retire early
• 10% is a reasonable starting point if 15% is not yet feasible

If you cannot hit your target savings rate right away, start with what you can afford and increase by 1% every time you get a raise. This gradual approach makes the adjustment painless because you never feel a reduction in take-home pay.

Also factor in employer matching contributions. If your employer matches 50% of contributions up to 6% of your salary, that is essentially free money. At minimum, contribute enough to capture the full employer match before directing extra savings elsewhere.

Investment fees are a silent drag on retirement savings that most people underestimate. Even a seemingly small difference in fees compounds dramatically over a multi-decade timeline.

The most important fee to watch is the expense ratio on your funds. This is the annual percentage the fund charges to manage your money. Common ranges include:

• Index funds: 0.03% to 0.20% per year
• Actively managed funds: 0.50% to 1.50% per year
• Target-date funds: 0.10% to 0.75% per year

On a $500,000 portfolio, the difference between a 0.10% and a 1.00% expense ratio is $4,500 per year. Over 30 years, that fee difference can cost you hundreds of thousands of dollars in lost growth. Low-cost index funds consistently outperform most actively managed alternatives after fees, which is why they are the default recommendation for most retirement savers.

Beyond expense ratios, watch for advisory fees, trading commissions, and account maintenance fees. Each one reduces your effective return and slows your progress toward your retirement number.

A retirement plan is not something you set once and forget. Your income will change, your expenses will shift, and market returns will vary year to year. Running your numbers through a retirement calculator at least once a year keeps your plan grounded in reality.

When using a retirement savings calculator, model these scenarios:

• Base case: Your current contribution rate and a moderate return assumption (6% to 7% after inflation)
• Optimistic case: Slightly higher returns or an increased savings rate after a raise
• Conservative case: Lower returns or a period of reduced contributions

If your base case shows you falling short of your retirement number, you have clear options: increase your monthly contribution, extend your working years by a year or two, or reduce your target retirement spending. Small adjustments made early have a much larger impact than big changes made late.

A compound interest calculator is also useful for understanding how lump-sum contributions, like a tax refund or bonus, can accelerate your timeline. Even a single $5,000 extra contribution at age 30 can grow to over $35,000 by age 65 at a 7% return.