Frequently Asked Questions

Income tax (federal and state) is a tax on your earnings that funds general government operations. The amount you owe depends on your total taxable income and filing status, and is calculated when you file your annual tax return.

Payroll taxes (FICA) are separate taxes that specifically fund Social Security and Medicare. They are:

• Social Security: 6.2% of gross wages up to the annual wage base ($184,500 in 2026). Once you hit that cap, no further Social Security tax is withheld for the rest of the year.
• Medicare: 1.45% of all gross wages, plus an additional 0.9% on wages above $200,000 (single) or $250,000 (married filing jointly).

Your employer also pays a matching 6.2% Social Security and 1.45% Medicare on your behalf — those amounts are not reflected in your paycheck.

FICA taxes (Social Security and Medicare) are calculated on your gross wages — your total pay before any pre-tax deductions. This means that contributions to a 401k, traditional IRA, HSA, or medical insurance do not reduce the wages subject to FICA.

This is different from federal and state income tax withholding, which are calculated on your taxable income after pre-tax deductions are subtracted.

For example, if you earn $80,000 and contribute 10% to a traditional 401k:

• Federal and state income tax is withheld on $72,000 (gross minus $8,000 401k contribution)
• Social Security and Medicare are still withheld on the full $80,000

One benefit: your 401k basis for Social Security purposes reflects your full earnings, and Roth conversions later are not subject to FICA again.

Withholding is the amount your employer sends to the government from each paycheck as a prepayment toward your estimated tax bill. It is based on your W-4 elections and the IRS withholding tables — it is an approximation, not your final tax owed.

Actual tax liability is the true amount you owe for the year, calculated when you file your return. It accounts for your full income picture — investment income, deductions, credits, life changes, and more.

If too much was withheld during the year, you get a refund. If too little was withheld, you owe the difference (and may owe a penalty). The goal of withholding is to get as close to your actual liability as possible.

Federal income tax withholding is calculated using the IRS Publication 15-T withholding tables (updated for 2026), which is the same method employers use. This gives a very accurate estimate of the federal income tax withheld from each paycheck.

Social Security and Medicare withholding are also computed using the official rates and income caps.

That said, some factors are not accounted for and may affect your actual withholding:

• Additional withholding elected on your W-4 (Step 4c)
• Multiple jobs adjustments (W-4 Step 2)
• Dependent credits claimed on the W-4
• Itemized deductions beyond the standard deduction

There are two separate 401k limits to be aware of:

Elective deferral limit — the maximum you can contribute from your own paycheck across traditional and Roth 401k combined:

• Under 50: $24,500.00
• 50 or older (catch-up): $32,500.00 (an extra $8,000.00)

Annual additions limit — the cap on all contributions to a 401k including your elective deferrals, after-tax (Mega Backdoor Roth) contributions, and any employer match or profit sharing:

• Under 50: $72,000.00
• 50 or older (catch-up): $80,000.00

The Mega Backdoor Roth strategy uses after-tax contributions to fill the gap between your elective deferrals and the annual additions limit. The available room depends on how much your employer contributes.

Your combined contributions across all traditional and Roth IRAs cannot exceed:

• Under 50: $7,000.00/year
• 50 or older (catch-up): $8,000.00/year (an extra $1,000.00)

A few additional rules to keep in mind:

• Roth IRA income limits: your ability to contribute to a Roth IRA phases out at higher incomes ($138,000–$153,000 for single filers; $218,000–$228,000 for married filing jointly in recent years). Above the limit you cannot contribute directly, though a Backdoor Roth conversion is an option.
• Traditional IRA deductibility: contributions are always allowed, but the tax deduction phases out if you (or your spouse) are covered by a workplace retirement plan and your income exceeds certain thresholds.
• You must have earned income at least equal to your contribution for the year.

HSA (Health Savings Account) — available only if you are enrolled in a qualifying High Deductible Health Plan (HDHP). Contributions are pre-tax, grow tax-free, and withdrawals for qualified medical expenses are tax-free (triple tax advantage). Unused balances roll over indefinitely.

• Self-only coverage: $4,400.00/year
• Family coverage: $8,750.00/year
• 55 or older (catch-up): add $1,000.00/year to whichever limit applies

FSA (Flexible Spending Account) — employer-sponsored account that also lets you pay for qualified medical expenses pre-tax, but with different rules:

• The IRS limit for a healthcare FSA is $3,400/year (2025); your employer may set a lower cap.
• FSAs are generally use-it-or-lose-it — unused funds do not roll over (though employers may offer a grace period or allow a small rollover amount).
• You can have an FSA regardless of your health plan type, but you cannot contribute to an HSA while enrolled in a general-purpose healthcare FSA.

This calculator's HSA/FSA field applies pre-tax treatment to whatever amount you enter. Check with your employer or plan documents for which account type you have.

State withholding is an approximation. Unlike federal withholding, which uses IRS-published payroll withholding tables, state estimates here are calculated by applying the state's income tax brackets and standard deduction directly to your annualized taxable income.

This approach is reasonably accurate for most situations, but actual employer withholding may differ because:

• Many states publish separate withholding tables or percentage methods that differ slightly from the statutory tax brackets
• State standard deductions used here come from the Tax Foundation 2026 data and may not match the withholding-specific deduction amounts in each state's employer withholding guide
• Some states (e.g., Arizona) allow employees to choose their own withholding percentage
• Local/city taxes, occupational taxes, and state-specific credits are not included

For the most accurate state withholding, consult your state's department of revenue withholding tables or your employer's payroll provider.

Social Security pays you a monthly benefit in retirement based on your highest 35 years of indexed earnings. The amount is called your Primary Insurance Amount (PIA) and is calculated by Social Security — you can find your personalized estimate at ssa.gov/myaccount.

When you claim matters a lot:

• Full Retirement Age (FRA) is 67 for anyone born in 1960 or later. Claiming at FRA gives you 100% of your PIA.
• Claim early (age 62): benefit is reduced by up to ~30%. You collect for more years, but each check is smaller permanently.
• Delay past FRA (up to age 70): benefit grows by 8% per year. Waiting from 67 to 70 increases your monthly check by 24%.

The break-even age for delaying is roughly your mid-to-late 70s — if you expect to live longer than that, delaying usually pays off. If health or cash-flow is a concern, claiming earlier may make more sense.

Is Social Security taxable? Possibly. Up to 85% of your benefit may be subject to federal income tax depending on your combined income (AGI + tax-exempt interest + half your SS benefit):

• Single: 50% taxable above $25,000; 85% taxable above $34,000
• Married filing jointly: 50% taxable above $32,000; 85% taxable above $44,000

These thresholds are not inflation-adjusted, so most retirees with other income end up paying tax on 85% of their benefit.

The IRS requires you to start withdrawing from tax-deferred accounts (traditional 401k, traditional IRA, 403b, etc.) starting at age 73 (per the SECURE 2.0 Act). These mandatory withdrawals are called Required Minimum Distributions (RMDs).

How the amount is calculated:

Each year, your RMD = account balance ÷ distribution period from the IRS Uniform Lifetime Table. The distribution period shrinks each year (e.g., 26.5 at age 73, 20.2 at age 80), so the percentage you must withdraw increases as you age.

Key facts:

• RMDs are taxed as ordinary income — the same rate as wages.
• Missing an RMD triggers a penalty of 25% of the amount not withdrawn (reduced to 10% if corrected promptly).
• Roth IRAs are exempt from RMDs during the owner's lifetime — one reason they're valuable to preserve.
• If you're still working at 73, you may be able to delay RMDs from your current employer's 401k (but not from IRAs or old 401ks).
• Large RMDs can push you into a higher tax bracket, increase the taxable portion of your Social Security, and trigger Medicare IRMAA surcharges.

The retirement income planner on this site automatically calculates RMDs each year using the IRS table and takes them from the 401k balance first.

Long-term capital gains (LTCG) apply to assets held more than one year before selling. Qualified dividends (most dividends from U.S. stocks held long enough) are taxed at the same preferential rates. Both are taxed separately from — and lower than — ordinary income.

2026 LTCG / Qualified Dividend rates:

Single filers:

• 0% — taxable income up to $48,350
• 15% — taxable income $48,351 – $533,400
• 20% — taxable income above $533,400

Married filing jointly:

• 0% — taxable income up to $96,700
• 15% — taxable income $96,701 – $600,050
• 20% — taxable income above $600,050

Taxable income here means your AGI minus the standard deduction ($15,000 for single, $30,000 for MFJ in 2026). LTCG brackets stack on top of your ordinary income — so ordinary income fills the bottom of the bracket, and gains are taxed at whatever rate applies above that.

Short-term capital gains (assets held one year or less) are taxed as ordinary income at your regular bracket rate — no preferential treatment.

Because dividends don't change the tax math — they're already captured by the model. The reason differs by account type:

Taxable brokerage accounts

Qualified dividends are taxed at the same LTCG rates as selling shares. Receiving a $15,000 dividend from your brokerage and spending it is economically identical to selling $15,000 worth of appreciated shares for income — in both cases, you owe LTCG tax on the gain portion at the same rate. The planner models brokerage withdrawals with LTCG treatment on the gains fraction, so the result is already correct whether those dollars came from dividends or a sale.

Example: you hold $500,000 in a dividend-paying index fund with a 3% yield. That's $15,000/year in dividends taxed at LTCG rates. If instead you held a non-dividend fund and sold $15,000 of shares each year, the tax owed would be the same — the IRS doesn't care which method generated the income, only what your gain was.

Traditional retirement accounts (401k, IRA)

Inside a tax-deferred account, dividends, capital gains, and all other growth are invisible to the IRS until withdrawal. It doesn't matter if your 401k balance grew because dividends were reinvested or because share prices rose — when you withdraw $X, you owe ordinary income tax on $X, period. The internal mechanics of the account (dividend reinvestment, capital gain distributions, fund turnover) have zero tax consequence until the money leaves the account. Only the withdrawal amount matters, which is exactly what the planner models.

Roth accounts

Same logic: all growth inside a Roth is tax-free regardless of whether it came from dividends or price appreciation. The source of the growth is irrelevant to the tax calculation.

Since LTCG stack on top of ordinary income, you pay 0% on gains as long as your total taxable income stays below the threshold ($48,350 single / $96,700 MFJ in 2026). In retirement, several windows make this achievable:

The gap years: The period between when you retire and when Social Security + RMDs kick in is often your lowest-income window. With little ordinary income, you may have a large amount of "room" in the 0% LTCG bracket.

Practical strategies:

• Harvest gains at 0%: Sell appreciated brokerage positions to realize gains tax-free, then immediately buy them back. This resets your cost basis higher so future gains are smaller. Unlike tax-loss harvesting, there's no wash-sale rule for gains.
• Roth conversions in low-income years: Convert traditional 401k / IRA money to Roth while your ordinary income is low. You pay ordinary income tax on the conversion now, but future growth and withdrawals are tax-free — and you shrink the account that will force RMDs later.
• Sequence withdrawals tax-efficiently: In years before SS and RMDs, pull from brokerage (LTCG rate) and cash first. Keep ordinary income (401k withdrawals) low to preserve room in the 0% LTCG bracket.
• Watch the SS taxation cliff: Every extra dollar of ordinary income can make up to $0.85 of SS benefits taxable too — effectively raising your marginal rate. Staying below the SS provisional income thresholds ($34,000 single / $44,000 MFJ) protects both sides.

Example: a single retiree with $30,000 in ordinary income (401k withdrawals) has taxable income of about $15,000 after the standard deduction — leaving ~$33,000 of room in the 0% LTCG bracket. They can realize up to $33,000 in gains completely tax-free that year.

A Roth Conversion Ladder is a strategy where you systematically convert money from a Traditional IRA or 401k into a Roth IRA over several years — one “rung” at a time. Each conversion is a taxable event, but once it has seasoned for five years, the converted principal can be withdrawn penalty-free at any age.

Why do people use it?

• Early retirement access (FIRE): Normally, withdrawing from a Traditional IRA or 401k before age 59½ triggers a 10% early withdrawal penalty on top of income tax. The ladder sidesteps this by converting money years in advance, letting it season, and then withdrawing penalty-free.
• Tax bracket optimization: Rather than waiting and taking large, heavily-taxed RMDs at 73+, you convert gradually during low-income years — filling up a lower bracket (e.g., 12% or 22%) instead of paying 24–32% later.
• Reducing future RMDs: Every dollar converted to Roth shrinks the Traditional balance that will eventually be subject to Required Minimum Distributions, which can push you into higher brackets and increase Social Security taxation.
• Tax-free growth forever: Roth accounts have no RMDs during the owner's lifetime and all growth is tax-free. Converting earlier gives more years of tax-free compounding.

The ideal execution: pay the conversion tax from outside cash (not from the converted amount itself) so the full converted dollar goes into Roth and grows tax-free. This is why the tool shows taxes as an informational cost rather than deducting them from the Roth balance.

There are actually two separate 5-year rules for Roth accounts, and confusing them is common:

1. The earnings 5-year rule — applies to tax-free withdrawal of earnings (growth). Your Roth IRA must have been open for at least 5 years before earnings can be withdrawn tax-free, even after age 59½. The clock starts January 1 of the year of your first Roth IRA contribution or conversion. You only have one clock for all your Roth IRAs combined, so opening one early locks in the start date.

2. The conversion 5-year rule — applies to penalty-free withdrawal of converted principal before age 59½. Each Roth conversion starts its own 5-year clock. Converted principal (not earnings) can be withdrawn penalty-free after 5 years, even before 59½. This is the clock the Roth Conversion Ladder exploits.

Example: You convert $50,000 in 2025. In 2030 (5 years later), you can withdraw that $50,000 principal penalty-free regardless of your age. The growth on that $50,000 must wait until age 59½ (and the earnings 5-year rule is also satisfied) to be withdrawn tax-free.

Withdrawal ordering for Roth IRAs: The IRS treats Roth IRA withdrawals in a specific order:

1. Regular contributions (always penalty and tax-free)
2. Converted amounts (penalty-free after 5 years per conversion)
3. Earnings (tax and penalty-free only after 59½ + 5-year rule)

This ordering is favorable — contributions come out first so you can always access what you put in directly. The ladder strategy builds a growing pool of converted principal that progressively becomes available each year.

The best time to convert is when your taxable income is low — so the conversion is taxed at the lowest possible rate. Common windows:

• Early retirement gap years: The period between retiring early and when Social Security, pensions, or RMDs begin. With little or no ordinary income, you can convert large amounts at 10–22% rates.
• Career sabbaticals or low-income years: A year of part-time work, parental leave, or a planned career break can offer an opportunity to convert at reduced rates.
• Before RMDs begin at 73: Pre-RMD retirement years are often the last chance to do large conversions at predictable rates before mandatory withdrawals force income higher.

The 5-year lead time matters: Because each rung takes 5 years to season, you need to start converting at least 5 years before you want penalty-free access. If you retire at 50 and want withdrawals at 55, conversions must begin by age 50. Plan the ladder in advance — it cannot be rushed.

The tool lets you set a “Last Conversion Age” and shows which rungs will season within your horizon, so you can verify the timing works before committing to the strategy.

FIRE stands for Financial Independence, Retire Early. The goal is to accumulate enough invested assets that your portfolio can sustain your lifestyle indefinitely — so you no longer need to work for money.

Your FIRE number is the portfolio size where your safe annual withdrawal equals your annual spending:

FIRE number = Annual Spending ÷ Withdrawal Rate

At the default 4% withdrawal rate, the formula simplifies to Annual Spending × 25. For example, if you spend $50,000/year, your FIRE number is $1,250,000. The 4% rule is based on the Trinity Study (1998, updated 2010) and subsequent research, which found that a 4% initial withdrawal rate — adjusted for inflation each year — historically survived 30+ year retirements across most market conditions.

You can adjust the withdrawal rate in the calculator. A lower rate (e.g., 3–3.5%) gives more margin of safety for very long retirements; a higher rate (e.g., 5%) reduces the required portfolio but increases the risk of running out of money.

The FIRE community has developed several variants to accommodate different lifestyles and timelines. This calculator shows three:

• LeanFIRE: Full early retirement on a frugal budget — modeled here as 75% of your current spending. You reach this milestone sooner, but it leaves little room for discretionary expenses or unexpected costs.
• FIRE: Full financial independence at your current spending level. No work required.
• FatFIRE: Financial independence with extra cushion — modeled here as 150% of current spending. Covers a more luxurious lifestyle or large unexpected expenses without stress.

The 4% rule holds up well historically but has important limitations to understand:

Where it came from: The Trinity Study (1998) tested withdrawal rates against historical U.S. market data and found a 4% initial withdrawal rate — increased with inflation each year — had a very high success rate over 30-year periods.

Limitations:

• Time horizon: The original study used 30-year periods. If you retire at 40 and live to 90, you need a 50-year horizon — many researchers suggest 3–3.5% is safer for very long retirements.
• Sequence of returns risk: A market crash early in retirement is more damaging than the same crash later. A bad first decade can permanently impair a fixed-withdrawal strategy.
• U.S. data bias: The study used U.S. stock and bond returns, which were exceptional over the 20th century. International diversification helps but historical performance varies by country.
• Spending flexibility: Real retirees adapt — spending less in down markets and more in good ones. A flexible withdrawal strategy can tolerate a higher initial rate than a rigid 4%.

The calculator uses your chosen withdrawal rate to compute all milestones. Adjusting it is the fastest way to stress-test your plan.

A real return rate is your investment return after subtracting inflation. The calculator uses real returns so that all dollar amounts stay in today's purchasing power — no inflation adjustment is needed later.

Example: If the stock market returns 10% per year and inflation is 3%, your real return is approximately 7%. A portfolio that grows to $2M in nominal terms may only be worth $1.25M in today's dollars after 15 years of 3% inflation. The calculator sidesteps this complexity by working entirely in real terms.

Why 7%? The U.S. stock market has historically returned roughly 10% nominally and ~7% after inflation over long periods. This is a reasonable central estimate, but the future may differ. You can lower the rate to be conservative (e.g., 5–6%) or raise it if you expect higher returns.

The consequence: because everything is in real terms, the FIRE number shown is the amount you need in today's dollars — your actual nominal portfolio target will be higher if you're still years away from retirement.

Reducing spending hits your FIRE timeline from two directions at once, which is why the Savings Rate Impact chart bends so sharply:

1. Your FIRE number shrinks. Since FIRE number = spending ÷ withdrawal rate, every dollar less you spend reduces the target portfolio directly (by 25× at a 4% rate).
2. Your savings rate rises. Assuming income stays constant, the money not spent goes directly into savings, accelerating portfolio growth.

Earning more only helps on one dimension: it increases savings (assuming spending doesn't rise with income). Spending less simultaneously reduces the target AND increases the rate you approach it.

Example: You earn $80,000 and spend $60,000 (savings rate 25%). Your FIRE number at 4% SWR is $1,500,000.
If you reduce spending by $10,000 to $50,000: savings rate rises to 37.5% and FIRE number drops to $1,250,000 — a $250,000 smaller target reached with 50% more annual savings. The compounding of both effects is what makes the years-to-FIRE curve so steep on the left side of the chart.

No adjustment is needed because the comparison is based on ratios, not nominal dollar amounts. The break-even rule — Traditional wins if your effective retirement rate is below your current marginal rate — holds regardless of inflation. Here's why:

If wages and prices both double by the time you retire, your 401k balance doubles too. But so does the income that fills each tax bracket, and Congress historically indexes brackets to inflation. The result is that your effective rate on withdrawals stays the same in real terms. The ratio that drives the decision (current marginal rate vs. retirement effective rate) is unchanged whether you work in today's dollars or future dollars.

Put another way: inflating every number by the same factor cancels out. Comparing today's rates directly is both accurate and simpler than trying to project nominal tax brackets decades into the future.

The one scenario where this breaks down is if tax policy changes materially — e.g., Congress raises rates across the board. That's why the tool offers a “+10%” preset and a custom bracket editor: to let you stress-test the comparison against hypothetical future rate environments.