How do you calculate compound interest?

Use the formula A = P(1 + r/n)^(nt), where P is principal, r is annual rate, n is compounds per year, and t is years.

What is the best compounding frequency?

Daily compounding produces the highest returns. But the difference between daily and monthly is small.

How does compound interest help grow savings?

Your deposit earns interest. That interest gets added to your balance. Next period, you earn interest on the larger balance.

Is compound interest better than simple interest?

Yes. Simple interest pays only on your original principal. Compound interest pays on principal plus accumulated interest.

Retirement Planning 101: How Much Do You Need?

Calculate how much you need to retire comfortably. Understand the 4% rule, Social Security, and building a savings plan.

The 4% Rule

The most widely used retirement guideline: withdraw 4% of your portfolio in year one, then adjust for inflation each year. A $1 million portfolio supports $40,000/year ($3,333/month).

To find your number: multiply your annual expenses by 25. Need $60,000/year? Target $1.5 million. Need $80,000? Target $2 million.

How Much Should You Save Monthly?

Age 25, target $1M by 65: Save $381/month at 7% return

Age 35, target $1M by 65: Save $820/month at 7% return

Age 45, target $1M by 65: Save $1,920/month at 7% return

The message is clear: starting 10 years earlier cuts your required savings in half.

Retirement Account Types

401(k): Employer-sponsored, tax-deferred. Contribute at least enough to get the full employer match — it's free money. 2024 limit: $23,000 ($30,500 if over 50).

Traditional IRA: Tax-deductible contributions, taxed on withdrawal. Good if you expect lower taxes in retirement.

Roth IRA: Contributions after tax, withdrawals tax-free. Best if you expect higher taxes in retirement. 2024 limit: $7,000 ($8,000 if over 50).

Don't Forget Inflation

At 3% inflation, $50,000/year today requires $121,363/year in 30 years to maintain the same lifestyle. Your retirement plan must account for this erosion of purchasing power.

Article FAQs

When should I start planning for retirement?

Now. Every year you delay doubles the monthly savings required. Even small contributions in your 20s grow enormously thanks to compound interest.

Can I retire early?

Yes, with aggressive savings (50-70% of income). The FIRE movement demonstrates that financial independence in your 40s is achievable with discipline and proper planning.

What if I'm behind on retirement savings?

Increase savings aggressively, use catch-up contributions after 50, consider delaying retirement 2-3 years, and reduce planned retirement expenses. It's never too late to start.