CompoundFigFree Compound Interest & Investment Growth Calculators for Long-Term Wealth Planning

FAQ

• Q: How often should I compound?
  Daily compounding yields slightly more than monthly, but the gap is small for most savers. Focus on the rate and consistency of contributions.
• Q: Is compound interest taxable?
  Interest is taxed as ordinary income unless held in a tax-advantaged account like an IRA or 401(k). Consult a tax professional for your situation.

FAQ

• Q: Is DCA better than lump sum?
  Over long horizons, lump-sum investing typically outperforms DCA. DCA excels when markets are volatile or when you inherit capital gradually.
• Q: What interval should I use?
  Weekly or monthly rebalancing works well for most long-term investors. Keep the schedule consistent to remove emotion.

FAQ

• Q: How accurate is the Rule of 72?
  It is most accurate for returns between 6% and 10%. Outside that range the Rule of 73 or logarithmic math is more precise.
• Q: Does inflation affect the rule?
  Yes. Subtract the inflation rate from your nominal return to estimate real purchasing-power doubling time.

FAQ

• Q: What is a good CAGR?
  The S&P 500 averages roughly 10% annually before inflation. A 7–9% real CAGR is excellent for a diversified long-term portfolio.
• Q: Why doesn't CAGR reflect volatility?
  CAGR ignores the path of returns. Two investments with the same CAGR can have very different risk profiles.

FAQ

• Q: What is the average US inflation rate?
  Historically, US inflation averages around 3% per year, though it varies significantly across decades.
• Q: How do I hedge against inflation?
  Assets like stocks, real estate, and TIPS have historically provided inflation protection over long horizons.

FAQ

• Q: Are DRIPs worth it?
  For long-term investors, DRIPs harness compounding without additional effort or transaction costs in many brokerage programs.
• Q: How are DRIP dividends taxed?
  Reinvested dividends are still taxable in the year received, unless held in a tax-advantaged account.

FAQ

• Q: What return should I assume?
  Most planners use 6-8% nominal returns for diversified equities over long horizons, with 4-5% for conservative portfolios.
• Q: Should I model inflation?
  Yes. To get real purchasing power, subtract 2-3% from your nominal return to account for historical inflation.

FAQ

• Q: How much more does daily compounding give?
  For typical savings rates (3-5%), daily compounding adds a tiny fraction of a percent per year compared to monthly compounding.
• Q: Do all banks use daily compounding?
  Most high-yield savings accounts now use daily compounding, but CDs may use monthly or quarterly. Always check the fine print.

FAQ

• Q: Is recurring deposit better than lump sum?
  Mathematically, lump-sum investing earlier typically outperforms. Recurring deposits excel for savers building capital gradually from paychecks.
• Q: What compounding frequency is best?
  Higher frequencies (daily > monthly > quarterly) produce slightly more return, but the contribution amount and timeline matter far more.

FAQ

• Q: Which strategy wins statistically?
  Studies show lump-sum outperforms DCA roughly 2/3 of the time over long horizons, because markets generally rise over time.
• Q: Why do people still prefer DCA?
  Psychology. DCA reduces the regret of investing right before a crash. For large emotional windfalls, DCA can be the rational emotional choice.

FAQ

• Q: How much does 1% extra return matter?
  Over 30 years, 1% extra return on $10,000 grows from $81,156 (at 7%) to $108,347 (at 8%) — that's $27,000 more from just 1%.
• Q: Is chasing higher returns always better?
  No. Higher returns typically come with higher volatility and risk of permanent loss. Only chase returns you are actually compensated for taking.

FAQ

• Q: What's a good savings rate today?
  As of 2026, high-yield savings accounts offer 4-5% APY. Shop around — online banks typically pay 10x more than traditional brick-and-mortar.
• Q: Should I save or invest extra cash?
  Keep 3-6 months of expenses in savings for emergencies. Anything beyond that time horizon should generally be invested for higher long-term returns.

FAQ

• Q: How realistic is a 10% return assumption?
  The US stock market averaged ~10% nominal returns over the last century. Use 6-8% as a more conservative planning number for the next 20-30 years.
• Q: What's the fastest way to reach my goal?
  Three levers: increase monthly savings, earn a higher (but prudent) return, or reduce the target. Savings rate is the one you control most directly.

FAQ

• Q: What is the 2026 401(k) contribution limit?
  For 2026, the employee contribution limit is $23,500, with a $7,500 catch-up for those 50+. Total annual additions cap is $69,000.
• Q: Should I prioritize match over debt payoff?
  At minimum, contribute up to the match — it delivers an instant, risk-free return that is difficult to match elsewhere.

FAQ

• Q: Roth vs Traditional IRA — which wins?
  It depends on your current vs expected future tax bracket. Young earners often prefer Roth; high earners near retirement may favor Traditional.
• Q: What is the 2026 Roth IRA income limit?
  For 2026, Roth IRA contributions phase out for single filers earning above ~$146,000 and joint filers above ~$230,000.

FAQ

• Q: Can I have multiple IRAs?
  Yes. You can own multiple IRAs, though annual contribution limits apply across all IRA accounts in aggregate.
• Q: Should I convert Traditional to Roth?
  A Roth conversion can make sense if you expect your tax rate to rise, or if you have a year with unusually low taxable income.

FAQ

• Q: How much income do I need in retirement?
  A common benchmark is 70–80% of pre-retirement income. Adjust for expected healthcare costs, travel, and downsizing.
• Q: What is the 4% rule?
  The 4% rule suggests withdrawing 4% of your nest egg annually, adjusted for inflation, to sustain a 30-year retirement with high probability of success.

FAQ

• Q: How much do I need to retire early?
  A common FIRE target is 25× your annual expenses. Lean FIRE, Fat FIRE, and Coast FIRE each adjust the target based on lifestyle goals.
• Q: What rate of return should I assume?
  Most FIRE planners use 6–7% real (after-inflation) long-term equity returns, stress-testing with 4–5% to be conservative.

FAQ

• Q: What is the safe withdrawal rate?
  The classic 4% rule has been validated for 30+ year retirements. More conservative retirees target 3-3.5% for longer horizons or bequest goals.
• Q: Should I include Social Security?
  Yes. Social Security is the base layer of retirement income for most Americans. Add it after modeling your personal savings nest egg.

FAQ

• Q: How do healthcare costs factor in?
  Plan for $300K+ in out-of-pocket healthcare costs in retirement (per couple) above what Medicare covers. Factor this into your expenses.
• Q: Should I pay off my mortgage before retiring?
  Not necessarily mathematically optimal if your mortgage rate is low, but it dramatically reduces sequence-of-return risk and simplifies retirement cash flow.

FAQ

• Q: What is the 2026 IRA contribution limit?
  $7,000 for those under 50, plus $1,000 catch-up contribution at age 50+. Limits apply across Traditional + Roth IRA combined.
• Q: Can I contribute to both IRA and 401(k)?
  Absolutely. You can max out both a 401(k) and an IRA in the same year, which is the gold standard for retirement savers.

FAQ

• Q: When should I take Social Security?
  Delaying beyond full retirement age increases your benefit by roughly 8% per year until age 70. Breakeven analysis depends on your health and longevity expectations.
• Q: What is the full retirement age?
  For most current workers, full retirement age is 66–67, depending on birth year. Check the Social Security Administration's table for your cohort.

FAQ

• Q: What is a good personal loan rate?
  Rates vary by credit score. Excellent-credit borrowers often qualify for rates below 10%, while subprime borrowers may face 20%+ APRs.
• Q: Should I use a personal loan to consolidate debt?
  Consolidation can lower your rate and simplify payments, but only addresses the symptom — fixing the spending pattern is what prevents a repeat.

FAQ

• Q: Does early payoff save money?
  Mathematically, yes — as long as the loan interest rate exceeds the after-tax return you could earn elsewhere. Watch out for prepayment penalties.
• Q: Should I pay extra on a low-rate mortgage?
  For low-interest debt (below 5%), investing extra cash in diversified markets may produce higher long-term returns. The math depends on your after-tax rate.

FAQ

• Q: What if I can only make minimum payments?
  Minimum payments on credit cards often barely cover interest. You may need to increase payments or consider a balance transfer to make meaningful progress.
• Q: Should I save or pay off debt first?
  Build a $1,000 starter emergency fund first, then attack high-interest debt (above 7-8%). After that, balance saving with extra debt payments based on rates and psychology.

FAQ

• Q: Which strategy is mathematically better?
  The avalanche method minimizes total interest paid. The snowball method is psychologically effective and keeps more people on track long enough to win.
• Q: Should I consolidate first?
  Consolidation can reduce your rate and simplify payments, but only if you commit to not running up new balances on the freed credit.

FAQ

• Q: What rate should I use for savings?
  Use a conservative rate matching your actual vehicle — high-yield savings for near-term goals, balanced portfolio for goals 5+ years away.
• Q: Should I adjust for inflation?
  Yes. For goals more than 5 years away, estimate the future cost by inflating the target at your expected inflation rate.

FAQ

• Q: Where should I keep my emergency fund?
  Keep it in a liquid, FDIC-insured high-yield savings or money market account. Not in stocks, bonds, or crypto.
• Q: How do I calculate monthly essential expenses?
  Track housing, food, utilities, transportation, insurance, and minimum debt payments. Exclude discretionary items like dining out and subscriptions.