Savings Calculator What Your Money Becomes Over Time

What this savings calculator works out (and how to read every metric)

Planning a multi-year savings target mentally almost always leads to the same error: we multiply our monthly deposit by twelve and by the number of years, tack on a rough mental guess for interest, and underestimate how strongly reinvested returns reshape long horizons—or overestimate what a low-yield bank account will buy after inflation. Whether you are building a six-month household emergency buffer, accumulating a 20 percent home deposit over four years, funding a child's university tuition, or projecting a thirty-year tax-free investment account, separating your personal cash contributions from compound growth lets you see whether your deposit size, interest rate, or timeline is doing the work.

When you select your currency, enter a starting balance (or zero if starting from scratch), add a planned monthly contribution, specify an expected nominal annual return rate, and choose a timeline between 1 and 60 years, the calculator runs a month-by-month compounding simulation locally in your browser and outputs four core metrics:

• Projected balance: The total nominal account value at the end of your chosen year, combining every unit of principal you paid in with every unit of cumulative compound interest earned along the way.
• Your deposits (total paid in): The exact out-of-pocket cash contributed over the full plan—calculated as your starting lump sum plus twelve monthly deposits for every year modelled. At a 0 percent return rate, your projected balance equals this figure exactly.
• Compound growth (cumulative interest earned): The net wealth generated purely by returns—equal to the projected balance minus your total deposits. It captures both interest earned directly on your deposits and secondary interest earned on prior months' reinvested interest.
• Balance multiple (final balance divided by total paid in): Displayed as a ratio such as 1.59× or 2.58×. A multiple of 1.00× means zero net growth; a multiple of 2.00× marks the exact threshold where compound interest has matched your total out-of-pocket contributions dollar for dollar or rand for rand; and a multiple of 3.52× means every 1 unit you contributed has grown into 3.52 units (1.00 unit of principal plus 2.52 units of compound return).

Beneath the summary card, the Year-by-Year Schedule lists your ending balance, cumulative interest earned to date, and cumulative cash paid in at the end of each twelve-month cycle (displaying up to the first 30 years while computing headline totals across up to 60 years). Reading down the middle column lets you pinpoint the exact year your annual interest gain surpasses a full year of fresh monthly deposits.

How compound growth accelerates and why the crossover year matters

Compound growth is the process of earning a return not only on the cash you deposit, but also on every unit of interest previously credited to the account. Each month, your bank or investment fund multiplies the balance sitting in the account by one-twelfth of the annual rate and adds that interest to your principal. The following month, the percentage rate has not changed, yet it applies to a larger base that now includes last month's interest plus last month's deposit.

Because human intuition is wired for straight-line addition rather than exponential curves, the first few years of any disciplined savings plan feel deceptively slow. Suppose you open an account with 0 rand and contribute R1,500 at the end of every month at 8.00 percent per year compounded monthly. Across Year 1, you pay in R18,000 of your own salary and earn just R675 in interest—barely more than two weeks' worth of deposits. By Year 5, you have paid in R90,000 and cumulative interest reaches R20,215, with R7,690 earned during that fifth year. By Year 10, the single-year interest earned during those twelve months alone hits R20,275—meaning the account itself is now adding more money every year than your R18,000 of annual deposits.

Two distinct milestones govern every long-term savings curve. The first is the annual velocity milestone (reached in Year 10 in the example above), where twelve months of interest exceeds twelve months of fresh contributions. The second—and visually more dramatic—milestone is the cumulative crossover year, where total lifetime compound interest overtakes total lifetime cash paid in (pushing the calculator's balance multiple past 2.00×). On that zero-start R1,500-per-month plan at 8.00 percent, the cumulative crossover happens in Year 16, when cumulative interest reaches R292,814 against R288,000 paid in.

Figure 1 illustrates this exact geometry in US dollars for a saver starting with $5,000 and contributing $500 per month at 7.00 percent over thirty years. At Year 10, the balance stands at $96,591 ($65,000 paid in plus $31,591 growth). At Year 18, cumulative interest ($119,923) pulls ahead of cumulative deposits ($113,000). Over the final ten years between Year 20 ($280,657) and Year 30 ($650,568), the account adds $369,911 of new value—even though the saver only deposited $60,000 during that entire final decade. Stopping a long-term plan early does not merely trim off a few average years; it amputates the steepest part of the curve.

The monthly savings formulas in plain words: lump sum, annuity, and APY vs nominal rates

Inside the script on this page, the calculator steps forward one month at a time from Month 1 to your final month. In every billing cycle, the existing balance grows by the monthly periodic rate and your monthly contribution is added at the end of the month. That iterative recurrence matches the standard closed-form future value equation used across retail banking and actuarial finance:

End-of-month (ordinary annuity) versus beginning-of-month (annuity due) deposits

Notice the subtle order of operations in the recurrence above: the existing balance earns interest for the month first, and the new monthly deposit lands at the end of the month. In financial mathematics, this is called an ordinary annuity. It means your very first monthly deposit earns interest for n − 1 months, and your final monthly deposit on the last day of the plan earns zero interest before the snapshot is taken.

Some bank illustrations and spreadsheet templates (such as Excel or Google Sheets FV with type = 1) assume beginning-of-month deposits (an annuity due), where your debit order clears on Day 1 and immediately earns interest during that first month. Converting the deposit portion from end-of-month to beginning-of-month simply multiplies the deposit future value by one extra month of growth, (1 + r). For example, on a 20-year plan starting with R20,000 and adding R1,500 per month at 8.00 percent, end-of-month deposits produce R982,066.68 (rounded to R982,067), whereas beginning-of-month deposits produce R987,956.88—a difference of R5,890.20 (about 0.60 percent). Modelling end-of-month contributions is slightly more conservative because real salary deposits typically clear late in the month.

Nominal annual rate versus Effective Annual Yield (APY / AER)

When entering an interest rate from a bank advertisement, check how that institution quotes its yield. Banks use two different conventions that look nearly identical on a billboard:

• Nominal Annual Rate Compounded Monthly (NACM): Common across South African fixed deposits, notice accounts, and RSA Retail Savings Bonds. An 8.00% NACM quote means the bank literally divides 8.00% by 12 and credits 0.6667% per month. Because each month's interest compounds across the remaining months of the year, leaving the interest reinvested produces an effective annual yield of (1 + 0.08 ÷ 12)^12 − 1 = 8.30%. This calculator expects a nominal annual rate.
• Annual Percentage Yield (APY in the US) or Annual Equivalent Rate (AER in the UK): Under US Truth in Savings regulations and UK Financial Conduct Authority rules, retail banks headline the effective annual rate after intra-year compounding is already baked in. If a US high-yield savings account advertises 5.00% APY with monthly compounding, its underlying nominal rate is actually 4.89% (calculated as 12 × [(1.05)^(1 ÷ 12) − 1]). Entering 5.00% directly into a monthly-compounding calculator produces an effective 5.12% APY—a minor difference over two years, but worth converting via Nominal Rate = 12 × [(1 + APY)^(1 ÷ 12) − 1] when auditing exact multi-year fixed-rate certificates.

Step-by-step worked examples and how to reverse-calculate a monthly goal

Let us trace a complete South African savings plan using the exact figures generated by this calculator so you can verify every number on screen.

Worked Example 1 (Forward Projection in ZAR): Suppose you already hold R20,000 in a savings vehicle, commit to adding R1,500 per month, and earn a steady 8.00 percent nominal annual return (r = 0.08 ÷ 12 = 0.0066667 per month).

• After 1 year (12 months): You have paid in R20,000 + (R1,500 × 12) = R38,000. Your balance reaches R40,335, meaning compound growth contributed R2,335 (a 1.06× balance multiple).
• After 10 years (120 months): Total cash paid in is R200,000. Your balance reaches R318,812, including R118,812 of cumulative compound interest (1.59× multiple). During Year 10 alone, the account earns R23,677 in interest—comfortably beating your R18,000 of annual deposits.
• After 15 years (180 months — the crossover year): Total cash paid in is R290,000, while cumulative compound growth reaches R295,196 for a total balance of R585,196 (2.02× multiple). From this year onward, accumulated interest permanently exceeds your personal contributions.
• After 20 years (240 months): Your out-of-pocket deposits total R380,000. The starting R20,000 lump sum has grown on its own to R98,536, and your 240 monthly deposits have grown to R883,531, giving a combined balance of R982,067 and compound growth of R602,067 (2.58× multiple). In Year 20 alone, the account generates R74,508 of interest—more than four full years of your R1,500 monthly contributions.
• After 30 years (360 months): Extending the exact same R1,500 monthly habit by ten additional years adds only R180,000 in extra cash deposits (raising total paid in from R380,000 to R560,000), yet the projected balance surges from R982,067 to R2,454,254—with R1,894,254 coming from compound growth (4.38× multiple). Those final ten years generate R1,292,187 in pure interest, more than double the growth achieved across the first twenty years combined.

Reverse-engineering a savings goal: how much must you save each month?

Often you start from the opposite direction: you know the exact target sum you need—say 100,000 in dollars, pounds, euros, or rands for a home deposit, university fund, or capital reserve—and want to know the required monthly deposit. Rather than guessing inputs by trial and error, you can solve the annuity equation in reverse:

For instance, if you want to reach 100,000 in 10 years (120 months) starting from 0 at an 8.00 percent nominal return (r = 0.0066667), the growth factor [(1 + r)^120 − 1] equals 1.21964, so Monthly Deposit = (100,000 × 0.0066667) ÷ 1.21964 = 546.61 per month. Over 120 months you contribute only 65,593 out of pocket and compound interest supplies the remaining 34,407. The reference table below shows the exact end-of-month deposit needed to accumulate 100,000 currency units from a zero starting balance across common horizons and return rates (multiply any cell by 10 for a 1,000,000 target, or divide by 2 for a 50,000 target):

Look closely at the 3-year row versus the 20-year row. Over a 3-year horizon, raising your return from 5.0% to 8.0% trims your required monthly savings by only 113.45 per month—meaning short-term goals are governed almost entirely by your savings rate out of monthly income, not by chasing risky high yields. Over 20 years, by contrast, moving from 0% cash hoarding to an 8.0% compounding asset cuts the required monthly effort from 416.67 down to 169.77—a 59 percent reduction in out-of-pocket cost.

Starting early versus catching up: the mathematical cost of waiting ten years

One of the most persistent myths in personal finance is that postponing savings in your twenties or early thirties is painless because you can simply "save twice as much later" once your salary rises. Doubling your monthly contribution after losing a third of your timeline compensates for the missing deposits, but it cannot recover the lost compounding doublings.

Compare three savers who all earn an 8.00 percent nominal annual return compounded monthly from a zero starting balance through Age 55:

• Saver A (Consistent Early Starter — Age 25 to 55): Contributes $400 per month for 30 years (360 months). Total cash paid in is $144,000. Final balance at Age 55 is $596,144, including $452,144 of compound growth (4.14× multiple).
• Saver B (Delayed Double-Up — Age 35 to 55): Waits ten years, then contributes $800 per month for 20 years (240 months)—twice Saver A's monthly amount. Saver B pays in $192,000 ($48,000 more out of pocket than Saver A), yet finishes at Age 55 with $471,216 ($279,216 of growth, 2.45× multiple)—trailing Saver A by $124,928 despite contributing 33 percent more cash. To actually tie Saver A's $596,144 outcome over 20 years, Saver B would have to contribute $1,012.09 per month ($242,902 total paid in)—more than 2.5 times Saver A's monthly budget burden.
• Saver C (Early Ten-Year Sprint — Age 25 to 35 Only): Contributes $400 per month for just 10 years ($48,000 total paid in), reaches $73,178 at Age 35, stops adding new deposits completely, and leaves the balance untouched for the next 20 years at 8.00 percent. By Age 55, that untouched $73,178 compounds to $360,536 ($312,536 of growth, 7.51× multiple)—generating more pure compound growth on $48,000 of early deposits than Saver B earned on $192,000 of late deposits.

The practical takeaway is never despair if you are starting at 35, 45, or 50—Saver B still turned $192,000 into $471,216—but rather that starting today with a modest, sustainable debit order beats waiting two years until you feel ready to save a larger round number. You can always step up your monthly contribution later as your income grows.

Matching savings vehicles to your time horizon: the three-tier bucket architecture

Using a single bank account for every financial goal guarantees one of two costly errors: either you keep twenty-year retirement wealth in a 4 percent call account where inflation quietly destroys half its buying power, or you put next year's house deposit into an equity index fund that happens to drop 22 percent three months before transfer day. Structuring your savings into three distinct liquidity and horizon tiers prevents both mistakes and tells you which realistic return rate to test in the calculator above.

Tier 1: Immediate & Emergency Reserve (0 to 12 months)

Before locking money into fixed terms or market funds, build a liquid buffer covering 3 to 6 months of essential household expenses (rent or mortgage, groceries, utilities, transport, medical cover, and minimum debt repayments)—or 6 to 9 months if your household relies on a single income, freelance contracts, seasonal revenue, or operates in a high-unemployment labour market. Here, instant or 24-hour liquidity and zero nominal capital loss matter far more than squeezing out an extra 1 percent of yield. Appropriate homes include instant-access high-yield savings accounts and retail money market funds. If you also face high-interest consumer debt (such as credit cards or store loans at 18% to 28% APR), establish a starter one-month cash buffer first, clear the expensive debt using our Debt Payoff Calculator, and then finish building the full emergency reserve.

Tier 2: Target-Date Sinking Funds (1 to 5 years)

Money earmarked for a known calendar expense—a property deposit and transfer costs, a replacement vehicle paid in cash, postgraduate tuition, a wedding, or provisional business tax—cannot afford a multi-year stock market drawdown right when the invoice arrives, yet it sits idle long enough to earn noticeably higher yields than an everyday cheque sub-account. Match the maturity of the instrument to your target date using 32-day or 60-day notice accounts, 12-to-36-month fixed deposits or certificates of deposit (CDs), short-dated Treasury bills, or 2-, 3-, and 5-year sovereign retail savings bonds. Note that many fixed deposits require a single upfront lump sum rather than ongoing monthly top-ups; if you are saving monthly toward a 3-year target, accumulate monthly deposits in a notice or money market account or use a recurring-deposit / notice-deposit facility.

Tier 3: Long-Term Wealth & Financial Independence (7+ years)

Once your horizon stretches beyond seven to ten years—retirement supplementation, children's tertiary education starting at birth, or long-term financial independence—inflation replaces short-term price volatility as the primary threat. Historically, broad diversified equity index ETFs and multi-asset balanced funds held inside tax-sheltered wrappers (such as a South African TFSA, UK Stocks & Shares ISA, US Roth IRA, or Canadian TFSA) have delivered meaningful positive real returns above inflation over rolling 10-to-30-year periods, provided the saver stays invested through interim market corrections without panic-selling.

Where to save in South Africa: accounts, fixed deposits, TFSAs, and Retail Bonds

South African savers operate in an environment where nominal interest rates are relatively high by developed-market standards, largely because consumer price inflation targeted by the South African Reserve Bank (SARB) sits higher than in the US, UK, or Eurozone. Choosing the wrong local wrapper can leave your after-tax, after-inflation return negative even when the headline bank rate looks generous.

Transactional savings and notice deposit accounts

Basic savings pockets attached to everyday bank accounts often pay 3.5 to 6.0 percent per year—convenient for separating next month's bills, but usually below inflation. Stepping up to a 7-day, 32-day, or 60-day notice account typically lifts yields into the 7.0 to 8.75 percent range while still allowing ongoing monthly deposits. Just remember not to park genuine overnight emergency cash inside a strict 32-day notice product if early-access penalties would claw back your interest during a crisis.

Fixed deposits and money market unit trusts

South African fixed deposits lock a lump sum (often starting from R1,000 to R10,000) for 6 to 60 months in exchange for a guaranteed nominal rate—frequently 7.5 to 9.5 percent depending on the SARB repo cycle and whether you take interest monthly or reinvested at maturity. Meanwhile, CISCA-regulated money market unit trusts pool investor cash into short-term bank negotiable certificates of deposit (NCDs) and Treasury bills, historically delivering institutional cash yields near the repo rate with 24-to-48-hour withdrawal liquidity and support for monthly debit orders.

South African Tax-Free Savings Accounts (TFSAs)

Introduced under Section 12T of the Income Tax Act, a TFSA completely shelters all interest, local and foreign dividends, and capital gains from SARS tax forever. Contributions are strictly capped at R36,000 per tax year (1 March to end-February) across all providers combined, and R500,000 over your lifetime. Two critical rules trip up savers: first, contributing even one rand above R36,000 in a single tax year triggers an automatic 40 percent SARS penalty tax on the excess; second, withdrawals permanently burn your lifetime allowance—taking R50,000 out does not restore R50,000 of lifetime contribution room. Because the tax shelter becomes exponentially more valuable as growth compounds into the hundreds of thousands of rands, holding low-cost local or global equity ETFs inside a TFSA over 15 to 25 years generally unlocks far greater lifetime tax savings than using up your R500,000 cap on a taxable cash account whose interest already falls under the annual R23,800 interest exemption.

RSA Retail Savings Bonds (National Treasury)

Issued directly by the South African government with zero agency commissions or monthly platform fees (minimum R1,000), RSA Retail Savings Bonds come in fixed-rate 2-, 3-, and 5-year terms, inflation-linked 3-, 5-, and 10-year terms, and a flexible RSA Retail Top Up Bond specifically designed for recurring savers (minimum R500 initial deposit and R100 top-ups at any time over a 3-year cycle). Because they pay sovereign bond yields directly to citizens, they serve as an authoritative benchmark against which every commercial bank fixed deposit should be measured.

Benchmark savings rates and long-term returns across major countries

Because this calculator supports ten major currencies, choosing a realistic rate input depends heavily on the central bank policy rate and structural inflation regime of the currency you select. A 10 percent nominal bank deposit yield in Nigerian naira or Kenyan shillings does not represent higher real wealth creation than a 4.25 percent yield in US dollars or British pounds if domestic inflation is running three times higher.

Notice the sharp spread in markets like the United States, Nigeria, and India between standard brick-and-mortar bank savings accounts and money market or sovereign Treasury instruments. Before running your projection, check the exact nominal rate paid on your actual account tier rather than assuming every bank pays the central bank benchmark.

Tax on savings interest and tax-sheltered wrappers across jurisdictions

Unless your cash sits inside a statutory tax-free wrapper, revenue authorities treat savings interest as taxable income. Because tax is deducted annually on interest earned in bank accounts and money market funds, paying tax each year reduces the amount reinvested—creating a compounding tax drag over decades.

• South Africa (SARS): Local interest earned outside a TFSA is exempt up to R23,800 per year (under age 65) or R34,500 per year (age 65 and older). At an 8.00% yield, an individual under 65 can hold roughly R297,500 in taxable cash before paying a single cent of interest tax. Above that ceiling, excess interest is taxed at your marginal PAYE bracket (18% to 45%). For someone in the 31% tax bracket earning 8.00% above the exemption, the net after-tax yield drops to 8.00% × (1 − 0.31) = 5.52%.
• United Kingdom (HMRC): Under the Personal Savings Allowance (PSA), basic-rate (20%) taxpayers earn up to £1,000 of non-ISA interest tax-free per tax year, higher-rate (40%) taxpayers get £500, and additional-rate (45%) taxpayers receive £0. Separately, UK residents can shelter up to £20,000 per tax year across Cash ISAs and Stocks & Shares ISAs completely free of income and capital gains tax.
• United States (IRS): Interest from high-yield savings accounts and bank CDs (reported on Form 1099-INT) has no federal exemption and is taxed at ordinary federal and state income tax brackets. However, interest on direct US Treasury bills, notes, and I-Bonds is exempt from state and local income taxes, while qualified growth inside a Roth IRA or Health Savings Account (HSA) compounds tax-free.
• Canada (CRA): Interest in non-registered high-interest savings accounts (HISAs) and GICs is 100% taxable at your marginal combined federal/provincial rate, making TFSA (Tax-Free Savings Account) and FHSA (First Home Savings Account, for first-time home buyers) priority shelters.
• Kenya & Nigeria: In Kenya, bank deposit and money market interest generally carries a 15% final withholding tax deducted at source, whereas qualifying Kenyan government Infrastructure Bonds are statutory tax-exempt. In Nigeria, commercial bank savings interest attracts a 10% withholding tax when rules apply, whereas Federal Government of Nigeria (FGN) Savings Bonds enjoy tax-exempt interest for retail investors.
• India: Under the old tax regime, Section 80TTA exempts up to ₹10,000 of savings-account interest (not fixed deposits) for individuals under 60, while Section 80TTB exempts up to ₹50,000 (including fixed deposits) for senior citizens; the sovereign Public Provident Fund (PPF) enjoys Exempt-Exempt-Exempt (EEE) tax status up to ₹1.5 lakh per financial year.

How to model after-tax returns in this calculator: If your account sits above tax-free exemptions or incurs a flat withholding tax at source, multiply your gross nominal rate by (1 − Marginal or Withholding Tax Rate) before entering it. For example, a Kenyan money market fund quoting 11.00% gross less 15% withholding tax nets 11.00% × 0.85 = 9.35% net annual return.

Inflation and management fees: calculating real purchasing power with the Fisher equation

The projected balance displayed at the top of the calculator is a nominal balance—the literal number of currency units printed on your bank statement in 10, 20, or 30 years. Two silent frictions stand between that headline nominal number and the real goods and services your future self can actually buy: annual investment fees and consumer price inflation.

Many people estimate their inflation-adjusted ("real") return by simply subtracting inflation from the interest rate (8% − 5% = 3%). That mental shortcut works reasonably well when inflation is 2%, but it systematically overstates real returns when inflation runs at 5%, 8%, or 15%. Economists and financial planners use the exact Fisher Equation:

Suppose your investment earns 8.00% gross (0.08) and consumer inflation averages 5.00% per year (0.05) with zero fees. Simple subtraction suggests a 3.00% real return, but the exact Fisher real rate is (1.08 ÷ 1.05) − 1 = 0.02857, or 2.86% per year. In a higher-inflation economy earning 15.0% on Treasury bills while inflation runs at 12.0%, simple subtraction claims 3.00%, whereas true Fisher purchasing-power growth is (1.15 ÷ 1.12) − 1 = 2.68%.

Now watch what happens when you layer a seemingly modest 1.50% annual Effective Annual Cost (EAC)—typical of many retail actively managed funds plus platform administration—onto our earlier 20-year South African plan (R20,000 starting balance + R1,500/month at 8.00% gross, where you pay in R380,000 total):

Look at Rows 3 and 4 in that table. Switching from a 1.50% high-fee retail product to a 0.25% low-cost broad index ETF (7.75% net nominal, Fisher real rate (1.0775 ÷ 1.05) − 1 = 2.62%) literally doubles your real inflation-adjusted wealth gain above your deposits (from +R63,022 to +R126,496 in today's buying power) without taking on any additional market risk or adding a single extra rand from your monthly budget.

Common mistakes that derail savings plans (and how to stress-test your numbers)

Running clean projections takes thirty seconds, yet five recurring planning blind spots account for most shortfalls between spreadsheet expectations and real-world bank balances:

• Extrapolating promotional teaser rates across decades: Many banks advertise a headline "up to 9.5% or 5.25% bonus rate" that either applies only for the first 3 to 6 months, requires you never to make a withdrawal, or applies only to balances above a high threshold (or capped at a small balance). Read the tiered interest schedule and enter the sustainable ongoing rate, not the three-month marketing teaser.
• Treating volatile average equity returns as a smooth straight line: A global equity ETF that averages 10 percent annualised over twenty years does not credit +0.83% every month like a fixed deposit; it may surge +24% one year, drop −16% the next, and trade sideways in year three. While sequence-of-returns volatility actually helps disciplined monthly savers during early accumulation years (because fixed monthly debit orders buy more shares when prices dip—known as rand-cost or dollar-cost averaging), a sharp market drop right before your spending date can cut your terminal balance by 20% to 35%. Gradually de-risking funds into cash or short-term bonds 2 to 3 years before a fixed spending date protects accumulated gains.
• Ignoring total fee layers (EAC, TER, platform, and advice fees): Savers frequently check a fund's management fee (say 0.85%) while overlooking the wrapper administration fee (0.40%), transaction costs (0.15%), and ongoing adviser trail commission (0.50%). In South Africa, always request the standardized Effective Annual Cost (EAC) disclosure; in the US and UK, check the Expense Ratio plus any platform custody fee, and deduct the combined figure from your rate input.
• Raiding long-term compounding buckets for predictable annual irregular bills: Car tyres, annual school levies, festive travel, insurance excesses, and home repairs are not unexpected emergencies—they are predictable lumpy expenses. Without a dedicated Tier 1/Tier 2 sinking fund for annual bills, households repeatedly liquidate long-term investments in Years 4, 8, and 12, resetting the compounding clock back to Year 1 each time.
• Testing only one optimistic scenario: Professional planners always run a three-point sensitivity check: a conservative rate (for example 5% nominal / 1% real), a base-case rate (8% nominal / 2.86% real), and an optimistic rate (10% nominal / 4.76% real). If your plan still meets your minimum non-negotiable goal under the conservative rate, your target is resilient.

Financial disclaimer, model limitations, and institutional sources