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Lesson 8 of 8

Lesson 8 · 8 min · Final Lesson

Building Your Personal Retirement Projection

A step-by-step framework to project your retirement date, income, and gap — and the levers you can pull to close it.

In this lesson you'll learn

The three inputs that drive every retirement projection

How to calculate your retirement gap with a real worked example

The 5 levers available to close any shortfall

A concrete 5-step action plan you can execute this week

A review of the full 8-lesson retirement planning arc

The Three Numbers That Drive Your Projection

A retirement projection comes down to three core variables. Get these right and the math takes care of itself:

Current savings + monthly contributions

Your starting balance (every account: 401k, IRA, taxable) plus how much you add each month. This is the fuel in the engine.

Expected rate of return

Use realistic figures: 6–7% real return for a 60/40 portfolio; 7–8% for an 80/20 equity-heavy portfolio. These are post-inflation, long-run historical averages — not guarantees.

Time horizon

How many years until your target retirement date. Even 2–3 extra years of compounding can dramatically close a gap.

Once you have these three numbers, use the Future Value formula or a free retirement calculator to arrive at your projected nest egg. Compare that to your 4% rule target (Lesson 5) to find your gap.

The Retirement Gap Analysis

Let's walk through a complete worked example — a 43-year-old aiming to retire at 65:

Example Profile

Age

Salary

$90,000

Current savings

$220,000

Monthly contribution

$1,500

Expected return

7% / year

Years to age 65

22 years

Step 1: Project existing savings

$220,000 × (1.07)²² ≈ $963,000

Your current $220k grows at 7% for 22 years.

Step 2: Project future contributions

$1,500/mo × [(1.07²² − 1) / 0.07] × 12 ≈ $883,000

Monthly contributions compounding over 22 years.

Step 3: Total projected nest egg

$963,000 + $883,000 ≈ $1,035,000

Add both components. You're in solid shape.

Step 4: Calculate retirement target (4% rule)

($90k × 70% = $63k) − $20k SS = $43k × 25 = $1,075,000

Need $43k/year from portfolio after Social Security. × 25 = target.

Step 5: Find the gap

$1,075,000 − $1,035,000 = ~$40,000 gap

Nearly on track. Save an extra $50/month to close it entirely.

The 5 Levers for Closing the Gap

If your projection shows a shortfall, you have five levers — and most people have at least two or three available:

Save moreHigh impact

+$200–500/month for 20 years ≈ +$100k–$260k

Increasing contributions by even $200–500/month has outsized compounding impact. This is almost always the highest-leverage lever. Check if you can auto-escalate your 401(k) by 1% per year.

Work longerVery high impact

Each extra year adds savings AND reduces the withdrawal period

Working 2–3 extra years does double duty: you continue contributing AND your existing savings compound longer AND your target nest egg shrinks (fewer retirement years). One of the most powerful levers available.

Retire on lessHigh impact

$10k/year less in retirement = $250k lower target

If you can live on $45k/year instead of $55k, your 4% rule target drops by $250k. Geographic arbitrage, a paid-off home, or simply spending less are all valid paths to a lower target.

Invest more aggressivelyModerate impact

+1% annual return over 22 years ≈ +$150k–200k

Only safe early in career. Don't chase returns near retirement — the risk of a large drawdown outweighs the potential gains. For a 43-year-old, a slightly higher equity allocation may be warranted if risk tolerance allows.

Part-time income in early retirementHigh impact

$1,500/month for 5 years = $90k not drawn from portfolio + continued growth

$1,000–2,000/month for 5 years in early retirement dramatically changes the math. Consulting, part-time work, freelancing, or a small business can eliminate the need to tap your portfolio in the crucial early withdrawal years.

What to Do Right Now — Your Action Plan

Here are 5 concrete steps you can take this week to turn this lesson into real action:

Get your Social Security estimate5 minutes

Go to ssa.gov/myaccount and create a free account. Your statement shows estimated benefits at 62, FRA, and 70. This is one of the most important numbers in your retirement plan.

Calculate your retirement number10 minutes

Use the formula: (annual expenses in retirement − Social Security income) × 25. Write it down. This is your target nest egg.

Check your current trajectory15 minutes

Use an online retirement calculator (Fidelity, Vanguard, or Bankrate all have free tools) or do the FV math: FV = Current savings × (1 + r)^n + Monthly contribution × [(1+r)^n − 1] / r × 12.

Identify your gap and pick 1–2 levers30 minutes

Compare your projected nest egg to your retirement number. If there's a gap, choose the 1–2 levers from Section 3 that are most feasible for your situation and set a specific goal.

Set up auto-escalation on your 401(k)5 minutes

Many 401(k) providers offer an auto-escalation feature that increases your contribution rate by 1% each year automatically. If yours has it, enable it now. A 1%/year increase is barely noticeable in your paycheck but dramatically compounds over a career.

Course Summary — What You've Learned

Over 8 lessons you've built a complete, practical retirement planning framework:

Retirement Account Toolkit: 401(k), IRA, Roth — the right account for every situation and the contribution limits that matter.

The 401(k) Employer Match: Free money you can't afford to miss — matching formulas, vesting, and contribution optimization.

Roth vs Traditional: Tax-now vs tax-later — a framework for choosing based on your current and expected future bracket.

Savings Benchmarks by Decade: What to have saved by your 30s, 40s, and 50s — and what to do if you're behind.

The 4% Rule: How to calculate your retirement number and when to adjust the withdrawal rate.

Social Security Timing: How your benefit is calculated, the breakeven analysis, and strategies for couples.

Asset Allocation & the Glide Path: Shifting from growth-heavy to income-stable as retirement approaches — target-date funds vs DIY.

Building Your Retirement Projection: The 3 key inputs, a gap analysis, 5 levers to close any shortfall, and a 5-step action plan.

Quick Knowledge Check

3 questions · test what you've just learned

To calculate your projected retirement nest egg, which three inputs are most important?

You project a $200,000 gap between your nest egg and your 4% rule target. Which lever has the biggest long-term impact?

Which free government resource lets you see your estimated Social Security benefit at different claiming ages?

Key takeaways from Lesson 8

Your retirement projection needs three inputs: current savings + contributions, expected return, and time horizon.

The FV formula (or any free calculator) turns those inputs into a projected nest egg you can compare to your 4% rule target.

If there's a gap, the 5 levers are: save more, work longer, retire on less, invest more aggressively (early only), or earn part-time in early retirement.

Increasing contributions by $300–500/month is almost always the highest-impact lever available.

Get your Social Security estimate at ssa.gov/myaccount — it's free and takes 5 minutes.

Auto-escalation on your 401(k) is the lowest-friction way to close a gap over a career.

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Course Complete!

You've finished Retirement Planning 101. You now have the tools to project your retirement, optimize your accounts, and make informed decisions about Social Security and withdrawal timing.

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