The words retirement pros hide from you

Every term that matters, in plain English: what it is, why it matters, and how to use it in your favor.

account typesAffordable Care ActAfter-tax legacy estimateauxiliary benefitsBackdoor Roth IRAbeneficiaries, TOD, probateCatch-up contributionsclaiming Social SecurityCOLAcost basisdynamic spendingfunding levelGo-go, slow-go, no-go yearsguaranteed lifetime incomehealthspanHome-sale gain exclusionHSAIncome-Related Monthly Adjustment AmountInherited IRA and the 10-year rulelatest retirement-benefit filing ageLTCMarginal vs effective tax rateMedicaid & VA caregiver programsMedicare Parts A, B, D, and Medigap Plan GMega backdoor RothMonte Carlopart-time workprovisional incomeQCDreal vs nominalRMDRoth 5-year rulesRoth conversionRule of 55 · 72(t)safe withdrawal rateSECURE 2.0Senior deductionSequence-of-returns risksequencingSocial Security earnings teststatutory residencystep-up in basisSurvivor (widow's) tax trapthe 3.8% surtaxthe IRMAA appeal

Your roadmap's numbers

Money-lasts chance · Monte Carlo

What it is
The percentage on your Readiness tab. The tool runs your roadmap through 400 different market histories and counts how many times your money lasts to the age you set.
Why it matters
A single “you're on track” from a fixed-return calculator hides the risk. Running hundreds of real market paths shows how often your roadmap actually holds, and how often it does not.
How to optimize
Treat the number as a cushion, not a promise. In your 40s and 50s, look at what is failing, usually a rough early market, and fix that. Above 85 to 90 percent is a comfortable margin for most people.

Today's dollars · real vs nominal

What it is
Every number in your roadmap is shown in what it would buy today, with inflation stripped out. So $5,000 in 2045 means 2045 money that feels like $5,000 does now.
Why it matters
Future dollars look big but buy less. Showing everything in today's dollars keeps the numbers honest and readable across a 30-year roadmap.
How to optimize
Read your roadmap as your real standard of living, not a future price tag. When you compare income streams, check which keep up with inflation and which quietly shrink.

Marginal vs effective tax rate

What it is
Your marginal rate is the tax on your next dollar of income, the top bracket you reach. Your effective rate is the total tax you pay divided by all your income, always lower because the early dollars are taxed less.
Why it matters
Decisions like a Roth conversion or an extra withdrawal are priced at your marginal rate, not your effective one. Confusing the two makes conversions look cheaper or costlier than they are.
How to optimize
Size conversions and withdrawals against the marginal rate, the bracket you are filling. Judge your overall tax burden by the effective rate. The planner tracks both as your income changes.

The three buckets · account types

What it is
Your money sits in three tax buckets: pre-tax (traditional 401k and IRA, taxed on the way out), taxable (a brokerage account, taxed on gains), and Roth (taxed already, comes out tax-free).
Why it matters
Which bucket a dollar lives in changes what it is really worth and when it is cheapest to spend. Two people with the same balance can owe very different tax.
How to optimize
Compare which account type supplies spending in each year and what that does to taxable income, Medicare thresholds, RMDs, survivor taxes, and later flexibility.

After-tax legacy estimate

What it is
An estimate of what heirs may receive after taxes still owed on inherited pre-tax accounts. It is shown only where the required heir assumptions are explicit, not as a flat haircut on every IRA dollar.
Why it matters
Two people with the same account balances can leave very different after-tax inheritances depending on heirs, account mix, and tax assumptions. A raw portfolio value is not the same thing as an after-tax estate.
How to optimize
Use confirmed legacy views for inheritance planning. Use the Big Picture financial-assets tile for pre-tax, taxable, Roth, HSA, and separate LTC reserve balances before future account taxes.

Funded ratio · funding level

What it is
A resources-versus-needs ratio: what a roadmap has and will bring in compared with what it needs to cover every year. RetireRebel does not currently show this as the Home Base percentage.
Why it matters
It answers “does the money add up” as a simple ratio, separate from the money-lasts chance. The chance asks how often you succeed across market runs. Funding asks whether the totals balance.
How to optimize
Use the Home Base money-lasts chance for the current Monte Carlo view. A true funded-ratio feature should be treated as a separate calculation if it is added later.

Spending and drawdown

The 4% rule · safe withdrawal rate

What it is
A rough starting guide: if you withdraw about 4 percent of your savings in year one and adjust it for inflation each year after, the money has historically lasted about 30 years. A $1,000,000 portfolio supports roughly $40,000 a year.
Why it matters
It is a fast sanity check, and the math behind the gut check on the home page. But it is a blunt rule: it ignores taxes, a rough early market, changing spending, and your other income.
How to optimize
Use it to size a ballpark, then let the full year-by-year model refine it. Your real safe number moves with your Social Security, taxes, and how flexible your spending is.

Spending guardrails · dynamic spending

What it is
A rule that flexes your spending with the market: trim a little after a bad year, spend a little more after a good run. It sets an upper and lower rail around your plan instead of a fixed withdrawal.
Why it matters
Rigid spending is what breaks plans in a downturn. Small, temporary cuts in bad years do most of the work of protecting the money, and let you spend more the rest of the time.
How to optimize
Decide in advance how much you would trim in a rough stretch, often 10 percent, and for how long. The planner can model guardrails so you see the trade between a steady check and a safer plan.

Go-go, slow-go, no-go years

What it is
The three phases of retirement spending. Go-go (roughly 60s to mid-70s) is active and pricier: travel, projects, fun. Slow-go eases off. No-go is later, quieter, often with higher health costs.
Why it matters
Spending is not flat. Front-loading your good years changes how much you can safely take early.
How to optimize
Plan to spend more in your go-go years and let lifestyle spending drift down later. The planner models this with the go-go boost and the after-75 decline.

Withdrawal order · sequencing

What it is
The order used to spend taxable, pre-tax, Roth, HSA, cash, or other accounts in a given year.
Why it matters
The order changes your lifetime tax bill and how long the money lasts. A sequence that works in one year can be expensive in another.
How to optimize
Compare the baseline order against alternatives when taxes, RMDs, Medicare thresholds, capital gains, survivor planning, or legacy goals make the baseline less useful.

Sequence-of-returns risk

What it is
The danger of a market crash in the first few years of retirement, when you are drawing down. Bad early returns do far more damage than the same returns later.
Why it matters
Two people with the same average return can end up in very different places depending on when the bad years hit.
How to optimize
Keep a cash or bond cushion for early retirement, stay flexible on spending in down years, and check your plan against the weak and crash roadmaps.

Annuities · guaranteed lifetime income

What it is
A contract with an insurer: you hand over a lump sum and it pays you a set income, often for life. A plain income annuity is simple. Many sold products are complex, with high fees and a surrender charge that locks your money for years.
Why it matters
Guaranteed income can cover your basic bills no matter how markets or how long you live behave. But fees around 3 percent a year and surrender penalties can quietly cost more than they are worth.
How to optimize
Value the guaranteed income, not the sales pitch. Check the annual fee and the surrender window before you keep or exit one. The planner can model an income floor and compare keeping a contract against moving the money to index funds.

Official source: Investor.gov (SEC) ↗

Cost-of-Living Adjustment · COLA

What it is
An annual raise tied to inflation. Social Security has one. Some pensions and annuities do, many do not.
Why it matters
Income without a COLA loses buying power every year. Over a 30-year retirement that erosion is large.
How to optimize
Know which of your income streams keep up with inflation. Lean on the ones that do (Social Security) for lifetime security, and plan for the fixed ones to shrink in real terms.

Taxes and Roth strategy

Roth conversion

What it is
Moving money from a pre-tax account to a Roth account and paying the tax now, so it grows tax-free and comes out tax-free later with no RMDs.
Why it matters
Paying tax at today's rate can beat paying more later when RMDs, Social Security, and IRMAA stack up. It also leaves heirs a tax-free inheritance.
How to optimize
Compare the year, amount, reason, tax-payment source, and downstream effect. The right answer may be a smaller conversion or no conversion.

Official source: IRS.gov ↗

Backdoor Roth IRA

What it is
Putting money into a Roth IRA when your income is too high for a direct contribution. The usual path is a traditional IRA contribution followed by a Roth conversion.
Why it matters
Direct Roth IRA contributions are blocked above an income limit, but Roth conversions use a separate route. The catch is that a nondeductible IRA contribution must be reported, usually on Form 8606, and the pro-rata rule can make the conversion partly taxable if you hold pretax traditional, SEP, or SIMPLE IRA money.
How to optimize
Compare your IRA balances before doing it. A backdoor Roth is cleanest when you have little or no pretax IRA money and can track nondeductible basis correctly.

Official source: IRS Form 8606 ↗

Mega backdoor Roth

What it is
Extra Roth saving through your workplace retirement plan. It uses voluntary after-tax contributions inside a 401k or similar plan, then moves eligible money to Roth through an in-plan conversion or rollover.
Why it matters
It can let high earners move more money into Roth than the regular IRA route, but only if the employer plan permits the required after-tax contributions and Roth movement.
How to optimize
Ask the plan administrator whether the plan allows voluntary after-tax contributions, in-plan Roth conversions or eligible in-service Roth IRA distributions, and how much room remains under the annual plan limit.

Official source: IRS.gov ↗

Net Investment Income Tax · the 3.8% surtax

What it is
An extra 3.8 percent tax on investment income, capital gains, dividends, interest, once your income passes $200,000 single or $250,000 married. It rides on top of your regular capital-gains tax.
Why it matters
A big home sale, a large Roth conversion, or a good year of gains can push you over the line and add 3.8 percent to the part above it. It is easy to forget when you model a one-time event.
How to optimize
Watch the threshold in years with a large sale or conversion. Spreading income across years can keep you under it. The planner applies it to your income and to a taxable home-sale gain.

Official source: IRS.gov ↗

Capital gains · cost basis

What it is
When you sell from a taxable brokerage account, you owe tax only on the gain, the growth above what you paid, which is your cost basis. Long-term gains are taxed at 0, 15, or 20 percent depending on your income.
Why it matters
Selling from taxable is often the cheapest money to spend, because only the gain is taxed, and in low-income years the rate can be zero. But a large gain counts toward the income that drives IRMAA and Social Security taxation.
How to optimize
Harvest gains in low-income years to use the 0 percent rate. Watch that a big sale does not push you over an IRMAA tier two years later. The planner taxes only the gain portion of a taxable withdrawal.

Senior deduction

What it is
A federal deduction of up to $6,000 per person age 65 and older, on top of the standard deduction, in effect from 2025 through 2028. It phases out at higher incomes.
Why it matters
It lowers the taxable income of older households for a few years, which happens to overlap the Roth conversion window. More room under a bracket means cheaper conversions.
How to optimize
Compare taxable income with and without the temporary deduction while it is in force, then remember that it sunsets after 2028.

SECURE 2.0

What it is
A 2022 law that changed retirement rules. The big ones: the RMD start age moved to 73 (75 later), the missed-RMD penalty dropped, high earners' 401k catch-up must go into Roth, and there is a new larger catch-up at ages 60 to 63.
Why it matters
It quietly reshapes RMD timing, catch-up contributions, and Roth rules, the exact levers a plan pulls. Guidance built on the old ages can be wrong.
How to optimize
Use the current RMD age for your birth year, and know that a high-earner catch-up now lands in Roth. The planner already applies the SECURE 2.0 rules.

Roth 5-year rules

What it is
Two separate five-year clocks on Roth money. One starts with your first Roth account and controls when earnings come out tax-free. The other starts with each conversion and controls when that converted amount can come out penalty-free before 59 and a half.
Why it matters
People assume Roth is always reachable. Pull the wrong dollars too soon and a tax or penalty can apply. After 59 and a half the conversion clock stops mattering, but the earnings clock still does.
How to optimize
Open a Roth early to start the first clock, even with a small amount. Plan conversions so you are not forced to tap them within five years if you are under 59 and a half.

Catch-up contributions

What it is
Extra you can add to retirement accounts once you turn 50, and an even larger amount at ages 60 to 63. It sits on top of the normal limit.
Why it matters
The last working years are often the highest-earning, and catch-ups let you shovel more in while your bracket is high. For high earners, the catch-up now has to go into Roth.
How to optimize
Use them in your peak-earning years. If your catch-up is Roth-only, that is tax-free growth you cannot get later, not a downside.

Qualified charitable distribution · QCD

What it is
A direct gift from your IRA to a charity, allowed from age 70 and a half. Up to a yearly limit, it counts toward your RMD and never shows up as income.
Why it matters
A normal cash donation lowers tax only if you itemize, or, from 2026, up to $1,000 ($2,000 married) if you don't. A QCD lowers your income directly, which also eases Social Security taxation and IRMAA.
How to optimize
If you give to charity and have RMDs, give from the IRA instead of your checkbook. It is often the most tax-efficient dollar you can give.

Official source: IRS.gov ↗

Inherited IRA and the 10-year rule

What it is
When most non-spouse heirs inherit a traditional IRA, they must empty it within 10 years, and those withdrawals are taxable to them. A surviving spouse is exempt and can treat it as their own.
Why it matters
A large pre-tax IRA left to your kids can land on top of their peak-earning income and get taxed hard. It is a quiet tax bomb.
How to optimize
Convert pre-tax money to Roth during your lifetime, in your lower-bracket years, so heirs inherit tax-free instead of a 10-year taxable drawdown.

Early-withdrawal penalty · Rule of 55 · 72(t)

What it is
Take money from a retirement account before 59 and a half and you usually owe a 10 percent penalty on top of the tax. Two legal exceptions: the Rule of 55 lets you tap the 401k from the job you just left at 55 or later, and 72(t), or SEPP, lets you take fixed equal payments early without the penalty.
Why it matters
It is the gate that makes early retirement tricky. Miss the exceptions and you pay 10 percent to reach your own money.
How to optimize
If you retire at 55 to 58, know which accounts the Rule of 55 covers. Spend taxable and Roth-contribution money first, and treat 72(t) as a last resort, since it locks you into a payment schedule.

RMDs and Medicare

Required Minimum Distribution · RMD

What it is
The minimum amount the IRS makes you withdraw from pre-tax accounts (traditional 401k and IRA) each year once you reach the start age (73 or 75 depending on your birth year).
Why it matters
It forces taxable income whether you need the cash or not, and can push you into a higher bracket, tax your Social Security, and trigger IRMAA. Miss the deadline and the penalty is 25 percent of what you should have taken, dropping to 10 percent if you fix it within two years.
How to optimize
Do Roth conversions in your lower-income years before RMDs start, so there is less pre-tax balance left to force out later. A qualified charitable distribution can also satisfy an RMD without adding income.

Official source: IRS.gov ↗

IRMAA · Income-Related Monthly Adjustment Amount

What it is
A surcharge added to your Medicare Part B and Part D premiums when your income is above set thresholds.
Why it matters
It uses your tax return from two years earlier. A one-time income spike, like a big Roth conversion or a home sale, can raise your Medicare premiums two years later.
How to optimize
Watch the thresholds before large conversions or withdrawals. Spread income across years. Staying one dollar under a tier saves the whole surcharge. If your income dropped because you retired, file SSA-44 to appeal.

Official source: Medicare.gov ↗

SSA-44 · the IRMAA appeal

What it is
A form you file with Social Security to lower your Medicare IRMAA surcharge after a life-changing event, like retiring or the death of a spouse, that dropped your income.
Why it matters
IRMAA is priced off your income from two years earlier. Your first Medicare years can be billed on your old working income unless you appeal.
How to optimize
If your income fell because you stopped working, file SSA-44 right away, within the window. A voluntary Roth conversion is not a qualifying event, so a conversion cannot be appealed.

Official source: SSA.gov ↗

Medicare Parts A, B, D, and Medigap Plan G

What it is
Part A is hospital coverage, usually premium-free. Part B is doctors and outpatient, with a monthly premium. Part D is prescription drugs. Medigap Plan G is a private supplement policy, not a part of Medicare itself, that covers most of what A and B leave behind (High-Deductible Plan G trades a lower premium for a yearly deductible).
Why it matters
Most people think Medicare is free. It is not. Between Part B, Part D, a Medigap plan, and out-of-pocket costs, a couple can spend well over a thousand dollars a month.
How to optimize
Enroll during your window around 65 to avoid lifelong penalties. Compare Medigap (Plan G, or High-Deductible Plan G) against Medicare Advantage. Remember IRMAA can raise Part B and D if your income is high.

Official source: Medicare.gov ↗

ACA subsidy · Affordable Care Act

What it is
If you retire before 65, you buy health insurance on the ACA marketplace. Subsidies lower the premium based on your income.
Why it matters
In those bridge years, your income controls your health cost. As of 2026 the 400 percent of poverty cliff is back: earn one dollar over that line and the subsidy disappears entirely, not just shrinks. A big Roth conversion can push you over it.
How to optimize
Balance conversions against keeping your income under the cliff in the years before Medicare. It is a real tradeoff, not a free lunch, and crossing the line can cost thousands.

Official source: HealthCare.gov ↗

Social Security

Full retirement age · claiming Social Security

What it is
Full retirement age (FRA) is 67 if you were born in 1960 or later. Claim earlier, as early as 62, and your check is permanently smaller, down to about 30 percent less. Wait past FRA and it grows about 8 percent a year until 70.
Why it matters
Claiming age is one of the biggest money decisions in retirement. The break-even age, where waiting overtakes claiming early, usually lands in your late 70s or early 80s. Whether waiting pays off depends on your health, your cash needs, and your spouse.
How to optimize
Delaying buys bigger, inflation-protected checks for later, and raises the survivor benefit for a couple. Claiming early fits shorter health outlooks, needing the money, or leaving an IRA to heirs. The Social Security tool shows all four ages against the chance your money lasts.

Official source: SSA.gov ↗

Social Security earnings test

What it is
If you claim Social Security before full retirement age and keep working, part of your check is withheld once your earnings pass an annual limit. The withheld amount is not lost: your benefit is recalculated upward once you reach FRA.
Why it matters
People claim early, keep working, and are surprised when checks shrink. It only applies before FRA and only to earned income, not withdrawals or a pension.
How to optimize
If you plan to work, consider waiting to claim until FRA to avoid the withholding, or claim knowing the money comes back later. The planner applies an annual earnings-test model when you claim early while working.

Official source: SSA.gov ↗

Encore income · part-time work

What it is
Part-time, contract, or passion work in the first years of retirement. Even a modest amount changes the math by covering some spending so your portfolio keeps growing a little longer.
Why it matters
A few years of encore income is one of the strongest levers there is. It eases early withdrawals, the riskiest ones, and can let you delay Social Security for a bigger check later.
How to optimize
Model a few years of part-time income and watch the chance your money lasts move. Mind the earnings test if you also claim Social Security early. The planner treats encore income with its own payroll tax.

Social Security taxation · provisional income

What it is
Whether your Social Security is taxed depends on your provisional income: roughly half your benefit plus your other income. Above certain levels, up to 85 percent of your benefit becomes taxable.
Why it matters
Extra withdrawals or conversions can make more of your Social Security taxable, an easy trap to miss. Some states tax it too.
How to optimize
Manage the income that lands in the same year you collect Social Security. Roth withdrawals do not count toward provisional income, which is part of why a Roth balance is valuable.

Official source: SSA.gov ↗

Survivor (widow's) tax trap

What it is
When one spouse dies, the survivor keeps the larger Social Security benefit but loses the smaller one, and, from the year after the death, usually files as single with a lower standard deduction and tighter brackets. A survivor with a dependent child may instead qualify as a qualifying surviving spouse, which keeps joint rates for up to two years (IRS Pub 501).
Why it matters
Income can drop while the tax rate on it rises, and IRMAA thresholds for a single filer are lower. It catches many couples off guard. A pre-tax IRA passing to the survivor, and later to the kids under the 10-year rule, makes it worse.
How to optimize
Plan for it: Roth conversions while both are alive, life insurance, and choosing Social Security claiming ages so the survivor keeps the largest possible benefit.

Health and care

Health Savings Account · HSA

What it is
A savings account paired with a high-deductible health plan. It has a triple tax advantage: money goes in tax-free, grows tax-free, and comes out tax-free for medical costs. You must stop contributing once you enroll in Medicare, and premium-free Part A can be backdated up to 6 months (never before the month you turned 65) when you sign up after 65.
Why it matters
It is the most tax-efficient account there is, and an overlooked retirement tool. After 65 you can spend it on anything, paying only ordinary tax, like a traditional IRA, but on medical costs it stays tax-free.
How to optimize
If you have a high-deductible plan, max the HSA and, if you can, invest it rather than spend it, so it grows for retirement health costs. Stop contributions the month Medicare starts; if you sign up for Medicare or Social Security after 65, stop 6 months before you apply, because Part A coverage is retroactive and contributions in those months are excess (IRS Pub 969). The planner models the contribution, growth, and Medicare coverage stop.

Official source: IRS.gov ↗

Long-term care · LTC

What it is
Help with daily living, at home or in a facility, when you can no longer manage alone. Medicare does not cover most of it.
Why it matters
It is the single biggest wildcard in a plan. A multi-year care episode can cost hundreds of thousands and is the number that most often breaks a retirement.
How to optimize
Decide how to cover it: a dedicated reserve set aside, a long-term care insurance policy, or home equity as a backstop. The planner can hold a reserve or model a policy.

Planning horizon · healthspan

What it is
How many years your plan should cover. You set it as an assumption, guided by your family longevity and how active you are, not by a medical record.
Why it matters
Plan too short and you risk outliving the money. Plan too long and you may scare yourself out of spending. It is the single assumption that moves the plan the most.
How to optimize
Plan to a comfortably long age, then stress-test living even longer. Good health is also your best defense against long-term care costs.

Home, moving, and legacy

Home-sale gain exclusion

What it is
When you sell your primary home, up to $250,000 of gain is tax-free if single, $500,000 if married. Only the gain above that is taxed.
Why it matters
Downsizing can free a lot of equity, and most of the gain is often tax-free. But the part above the exclusion is a capital gain that can raise your income and IRMAA.
How to optimize
Live in the home two of the last five years to qualify. If the gain runs well over the exclusion, plan the sale year around your other income and any IRMAA tier.

Official source: IRS.gov ↗

Domicile · statutory residency

What it is
Domicile is your true, permanent home, the state that gets to tax you. Changing it for lower taxes takes real steps: license, voter registration, and where you actually spend your days. Many states use a 183-day rule to decide.
Why it matters
A move only saves tax if you genuinely change domicile. Many states can still tax you as a statutory resident if you keep a home there and spend too many days there.
How to optimize
If you move to a no-tax state, cut ties cleanly, track your days under the 183-day line, and move before you do big Roth conversions or sell appreciated assets.

Legacy basics · beneficiaries, TOD, probate

What it is
How money passes when you die. A beneficiary form on an IRA or life insurance sends it straight to the named person. Transfer-on-death and payable-on-death do the same for brokerage and bank accounts. Probate is the court process for whatever has no such instruction.
Why it matters
Beneficiary forms override your will. An out-of-date form can send money to the wrong person no matter what the will says. Naming beneficiaries also skips the delay and cost of probate.
How to optimize
Check every beneficiary and TOD after any big life change: marriage, divorce, a birth, a death. It is the cheapest, highest-leverage estate step there is.

Estate tax exclusion · step-up in basis

What it is
The federal estate tax only applies above a very high exclusion, currently in the millions per person, so most estates owe none. Separately, step-up in basis resets the cost basis of most assets to their value at death, so heirs who sell owe little or no capital gains.
Why it matters
Most people worry about a federal estate tax they will never owe, and overlook the step-up, which quietly makes taxable-account inheritances very tax-friendly.
How to optimize
Compare income taxes, beneficiary forms, account type, and heirs' likely tax situations before deciding whether to sell or hold an appreciated asset.

Social Security

Child and dependent benefits · auxiliary benefits

What it is
Benefits that may be payable to a child or certain dependent family member on a worker's Social Security record.
Why it matters
They can change household income while a child is eligible, but SSA decides eligibility and the official amount.
How to optimize
Compare only confirmed SSA benefit amounts in the roadmap. Treat unconfirmed eligibility as an official-resource task, not an engine result.

Official source: SSA.gov ↗

Turning 70 · latest retirement-benefit filing age

What it is
The point where delayed retirement credits for Social Security retirement benefits stop increasing the monthly check.
Why it matters
Waiting past 70 does not raise the retirement benefit, so filing needs to be an explicit task if you have not claimed.
How to optimize
Compare the age-70 benefit in the roadmap and confirm the official filing step with SSA. RetireRebel can remind and model; SSA files the claim.

Official source: SSA.gov ↗

Educational only, not licensed tax, legal, or financial advice. Outside links go to official government and regulator sites and open in a new tab.

← Back to home