Why Starting Early Makes Such a Difference
Retirement planning is fundamentally about giving compound interest time to work. The same $1,000,000 retirement goal requires vastly different monthly contributions depending on when you start:
| Start Age | Retire At | Years | Monthly Needed (7% return) |
|---|---|---|---|
| 25 | 65 | 40 | ~$490/month |
| 35 | 65 | 30 | ~$1,050/month |
| 45 | 65 | 20 | ~$2,600/month |
How Much Do You Need? The 4% Rule
The 4% Rule — developed by financial planner William Bengen in 1994 — is the most widely cited retirement planning guideline:
Retirement savings target = Annual expenses × 25
Withdraw no more than 4% per year — your portfolio should last 30+ years
- Spend $40,000/year in retirement → need $40,000 × 25 = $1,000,000
- Spend $60,000/year in retirement → need $60,000 × 25 = $1,500,000
- Spend $80,000/year in retirement → need $80,000 × 25 = $2,000,000
Calculate Your Personal Retirement Plan
Use tool.tl's retirement calculator with these inputs:
- Current age and target retirement age
- Current savings balance
- Monthly contribution amount
- Expected annual return
- Annual expenses in retirement
The calculator shows projected balance at retirement, whether it covers your expenses, and what adjustments are needed if there's a shortfall.
Key Retirement Accounts (US)
- 401(k): Employer-sponsored, pre-tax contributions. 2024 limit: $23,000. Always capture the full employer match first — it's free money
- Traditional IRA: Individual pre-tax account, 2024 limit: $7,000. Withdrawals taxed in retirement
- Roth IRA: After-tax contributions, 2024 limit: $7,000. Withdrawals in retirement are completely tax-free. Best for younger investors expecting higher future tax rates
Common Retirement Planning Mistakes
- Underestimating inflation: At 2.5% inflation, $60,000 today requires ~$105,000 in 25 years to maintain purchasing power
- Ignoring healthcare costs: Healthcare is often the largest retirement expense — plan for it separately
- Being too conservative: An all-cash portfolio may not keep pace with inflation over 30 years. A moderate stock allocation is necessary for long-term growth
- Relying only on Social Security: Social Security replaces about 40% of pre-retirement income for average earners — personal savings fill the rest
Frequently Asked Questions
Is the 4% rule still valid today?
Some financial researchers now recommend 3%–3.5% withdrawal rates given longer life expectancies and lower bond yields. For a conservative estimate, use annual expenses × 30–33 as your savings target.
What is a retirement savings gap?
The gap between what you're projected to accumulate at your current savings rate and what you'll actually need. The calculator identifies your gap and suggests how much more to save monthly to close it.
Is the calculator free?
Yes — tool.tl's retirement calculator is completely free, no account required, instant results.