Methodology

• Rates stay fixed. A variable APR or a promotional rate that expires will change the answer.
• You do not add new balances to the cards while paying them down.
• Federal student loans are treated like any other debt. The lab does not model income-driven plans or forgiveness, so check studentaid.gov for the options on those loans.
• Payments land on schedule. A missed payment can trigger a penalty APR that undoes months of progress.
• Minimum payments are treated as fixed. Most card issuers recalculate them as the balance drops, which slows real payoff slightly.

Open the debt payoff lab

• The return is a constant annual rate. Real markets do not deliver a steady 7%; they deliver a lumpy average.
• Contributions arrive on schedule and are never withdrawn.
• Taxes and fund fees are not deducted. A 1% expense ratio is roughly a seventh of a 7% return, every year.
• Nothing here predicts a market. A rate you type in is a scenario, not a forecast.

Open the compound interest lab

• Essential spending is what you would still pay with no income. If you included subscriptions and restaurants, your target is too high.
• The fund sits in cash you can reach in days, not in investments that might be down when you need them.
• You are not carrying high-interest credit card debt. If you are, a smaller buffer first and then the debt usually costs less overall.
• Health insurance continuity is not modeled. In the US, losing employer coverage is often the largest hidden cost of losing a job.

Open the emergency fund lab

• Rates are variable and not guaranteed. Savings rates move with central bank policy and can drop with no notice.
• The comparison ignores promotional rates that expire after a few months and revert to something much lower.
• Interest is taxable as ordinary income in most cases, so your after-tax gap is smaller than the headline figure.
• Deposits are assumed to stay within insured limits.

Open the high-yield savings lab

• Rent and expenses stay at the amounts entered; vacancy and rent increases are not modeled separately.
• Financing costs, taxes, insurance, and maintenance must be included in the monthly expense input if you want them reflected in cash flow.
• Gross rental yield uses annual rent divided by purchase price, before expenses.
• The tool does not calculate a rent-versus-buy break-even year or investment returns on an unused down payment.

Open the rental property comparison lab

• Taxes use 2026 federal brackets and the standard deduction, twelve equal pay months, and one flat illustrative rate per state. Cities, local taxes and state programs outside California's disability tax are not modeled.
• A bonus is taxed as if it were spread across the year's pay. Withholding on a bonus can be higher or lower than the tax actually owed.
• Your contribution is the same percent of salary at both jobs and is held to the 2026 limit of $24,500.
• Years of service for vesting are completed years. Plans define a year of service themselves, often 1,000 hours.
• Stock, equity, tuition help, retirement account growth and any benefit not listed are left out.

Open the job offer comparison lab

• Income, family size and the interest rate stay flat for the whole loan. Real income changes, and each year's payment is reset from the latest tax return.
• Every payment is on time and no loan goes through deferment, forbearance or consolidation. Interest on IBR accrues without being added to principal.
• One rate applies to the whole balance. Federal loans carry separate rates, and the plans apply to all eligible loans together.
• The poverty line is the 2026 HHS figure for the 48 contiguous states, $15,960 plus $5,680 for each added person. Alaska and Hawaii use higher figures.
• The tax on a forgiven balance is not modeled.
• Which plans your loans can use depends on when each loan was made and what type it is. Parent PLUS loans cannot use RAP, and your servicer sets the actual payment.

Open the student loan repayment lab

• The lab covers tax year 2026 only. Dates and limits change each year.
• The qualified business income (QBI) deduction is not modeled. It can lower income tax for many self-employed people, so the estimate can run higher than the tax you owe.
• Additional Medicare tax, credits, state and local tax are not modeled.
• Income and expenses are spread evenly. Uneven income can change when payments are due, and Form 2210 has an annualized method for it.
• Net profit is after business expenses. A mistake in expenses carries straight into the tax.

Open the 1099 quarterly taxes lab

• The $1,000 starter amount and the 8% cutoff for high-interest debt are this lab's defaults. Frameworks give a range rather than one number, and you can change the cutoff.
• The HSA catch-up at 55 and the IRA earned-income rule are not modeled.
• Inside the Roth phase-out range the lab flags that your limit may be lower. It does not compute the reduced limit.
• The match step does not size the match, because that depends on your plan's formula and your pay.
• The order is a convention, not a rule. Your plan's fees, your tax bracket and how steady your income is can change it.

Open the next dollar lab

• The tax estimate covers a bonus or back pay only. A refund, inheritance or gift is treated as money you can place in full.
• State tax, the Social Security wage base and the 0.9% Additional Medicare Tax are not modeled.
• Withholding is not the final tax. Your return settles the real amount, so the actual bill can be higher or lower.
• The order and the room come from the Next dollar lab, with its defaults for the starter fund and the debt cutoff.
• The split is a starting point. You can drag any slider, and the receipt shows how much is left to place.

Open the windfall allocator lab

• Pay that counts for Social Security and Medicare is gross pay less the health and HSA lines. Other pre-tax pay is allowed to be exempt or not, so the check accepts either.
• Rounding of up to 5 cents on a tax line is allowed. The net pay check is exact to the cent.
• State and local taxes, state disability programs and federal withholding amounts are not checked, because they depend on your W-4 and your state.
• The match check uses a percent of gross pay. Some plans define the match on eligible pay or in steps.
• The 401(k) pace note ignores catch-up contributions at age 50 and over.

Open the paystub decoder lab

• Closing costs are a single percent of price. A Loan Estimate lists the real ones, which vary by lender, title company, and state.
• Property tax and insurance are the numbers you enter. The lab does not look them up by state or county.
• The FHA upfront premium and VA funding fee are financed into the loan. VA terms assume a first use with no exemption.
• The FHA annual premium is the first-year figure, on the base loan. HUD recalculates it each year on the balance.
• Conventional PMI is an estimate. It depends on credit score, which the lab does not ask for.
• No seller credits, no transfer taxes, and no down payment assistance are modeled.

Open the first home cash to close lab

• The lab covers 2026 limits. They change each year.
• One coinsurance rate applies after the deductible. Copays and separate drug deductibles are not modeled.
• Care is in-network and happens in one plan year. HSA balances that roll over are not valued.
• Premiums are treated the same on every plan for tax, so they do not change the ranking.
• An employer's HSA deposit and your HSA tax savings are counted in full against the plan's cost.
• Some states, such as California, tax HSA contributions. The state rate field covers that if you fill it in.

Open the health plan chooser lab

• Credit reporting rules are as of October 2026. The bureaus' medical debt limits are voluntary and can change.
• The statute of limitations is the number you enter. Start dates and limits differ by state and kind of debt.
• The forgiven amount is taxed at one federal rate. State tax and the insolvency exclusion are not modeled.
• A settled account may be reported as settled rather than paid. The lab does not model how a given bureau codes it.
• The age of the debt is counted from the first missed payment, not from the date the account was sold.

Open the collections and medical debt lab

• The lab covers tax year 2026 only. Tables and limits change each year.
• Pay stays the same for the rest of the year. Bonuses, raises, and overtime change the answer.
• Step 4(b) is treated as deductions beyond the standard deduction, which is what the Deductions Worksheet on the form produces.
• A second job or a working spouse is one flat annual wage. For two jobs, the IRS Tax Withholding Estimator is more exact.
• Self-employment tax, Additional Medicare tax, credits other than Step 3, and state tax are not modeled.
• A paycheck's withholding is rounded to the cent, as a payroll system would.

Open the w-4 withholding check lab

• Deposit rules, deposit limits and which months are due at signing vary by state, city and landlord. The lab uses the numbers you enter.
• Furniture, moving and setup amounts are samples, not averages.
• Income is gross, before tax. A rent that is 30% of gross income is a larger share of take-home pay.
• Utilities, parking, pet fees, renters insurance after the first payment and rent increases are not included.
• The lab does not add roommates. To split rent, enter your share as the rent and your share of the one-time costs.

Open the rent and move-in cost lab

• Insurance, maintenance, depreciation and fuel prices are values you enter. The samples are not market averages, and quotes vary with age, location and record.
• Taxes, registration, fees, trade-in values and leasing are not modeled.
• Resale value is a smooth curve from the two depreciation rates. Real cars lose value unevenly, and mileage and condition matter.
• The interest deduction treats each twelve payments as one tax year, holds income flat, and values the saving with the 2026 federal brackets.
• Keeping a car assumes it needs no purchase of its own in five years. A repair bill larger than your maintenance estimate would raise the cost.

Open the car total cost lab

• Expected return and volatility for each asset class are fixed numbers you can edit, not live market data. Change one and every downstream figure changes with it.
• The age-based target uses a single rule, 120 minus your age, that ignores your specific goals, other savings, and how much guaranteed income you'll have in retirement.
• The four asset class percentages don't have to sum to 100% before you run it; the calculator normalizes your weights before computing return and volatility, so an unbalanced entry still produces a result.
• Rebalancing trades ignore taxes. Selling an appreciated position in a taxable account can trigger capital gains that this tool doesn't subtract.

Open the asset allocation lab

• The mortgage rate in the starting scenario is Freddie Mac's Primary Mortgage Market Survey 30-year average for the week of September 24, 2026. Every other starting figure is a labelled sample, not a national statistic.
• Mortgage-interest and property-tax deductions are ignored. Most filers take the standard deduction, so itemizing rarely changes the answer, but it can for a large loan in a high-tax state.
• Home price growth, rent growth and investment returns are steady every year. Real markets are not, and the answer moves a lot with the growth you assume.
• Investment gains are not taxed, and the renter invests every dollar saved. That favors renting if you would spend the difference instead.
• Private mortgage insurance, moving costs, refinancing, and the value of living where you want are not counted.

Open the rent or buy lab

• The opportunity cost calculation uses a flat 7% annual return, compounded monthly, for every year of the five- and ten-year projections. A real investment return is never that steady.
• It assumes you'd actually invest the exact amount you're currently losing to fees, rather than spending it, which is the harder part in practice.
• Fees are treated as fixed and recurring at today's rate for the entire projection period; a bank can raise or add fees at any time, and this doesn't anticipate that.
• It doesn't model fee waivers some banks offer for maintaining a minimum balance or setting up direct deposit, only whether a fee is on or off.

Open the bank fee impact lab

• The specific APYs shown for each term in this tool are illustrative sample rates as of October 2026, not live rates from any actual bank (the FDIC national average 12-month CD was 1.73% on September 21, 2026); check a current rate table before assuming these numbers reflect what's available today.
• Every rate here is treated as an APY, so the stated yield is what the deposit earns over a full year no matter how often the bank compounds.
• The early withdrawal penalty is modeled as a simplified months-of-interest calculation. Real bank penalty terms vary and are stated in the CD's actual disclosure.
• It assumes the deposit stays under FDIC coverage limits and within one insured institution.

Open the certificate of deposit lab

• The balanced strategy never spends more than your extra payment. If the amount is too small to reach 10% on every card, every card is paid down by the same fraction of what it would need.
• No interest accrual between now and when a payment posts is modeled; the calculator compares current balances against a single round of extra payments, not a multi-month payoff schedule.
• Minimum payments and statement dates are collected for each card but don't change how the strategies allocate your extra payment.
• Utilization here is calculated from the balance and limit you enter, which may not match what's reported to the credit bureaus if your statement closed on a different balance.

Open the credit utilization lab

• The premium estimate is this calculator's own simplified model, not a quote. Real insurers price disability coverage on medical underwriting that this tool does not do.
• Occupation risk uses one multiplier per job category. Two people in the same broad category can carry very different real-world risk.
• A longer waiting period lowers the modeled premium, which matches how real policies price, but the size of the discount here is an estimate, not a specific insurer's schedule.
• Employer-provided coverage, if you have it, has to be entered as existing coverage. It is not detected automatically.

Open the disability insurance lab

• Monthly prices come from a fixed sample path for the pattern you select; they aren't a forecast or a real market history.
• There are no transaction fees, spreads or bid-ask costs built into either the dollar-cost averaging or lump-sum path.
• The lump-sum comparison assumes you had the entire multi-month total available to invest on day one, which isn't the situation dollar-cost averaging is usually chosen for.
• Dividends and reinvestment aren't modeled; the result is price return only.

Open the dollar-cost averaging lab

• The federal exemption used is $15 million per person, the figure for deaths in 2026 (IRS Rev. Proc. 2025-32), and $30 million for a married couple. State exemptions and rates in the tool are approximate and change often, so confirm your state's current figures.
• State figures are for deaths in 2026. The tool applies each state's own graduated schedule, the same one the inheritance tax tool uses, so one estate gets the same state tax in both. New York taxes the whole estate once it passes 105% of its exemption.
• This is estate tax, a tax on the estate itself before distribution. It is separate from inheritance tax, a tax some states charge the person receiving an inheritance, which this tool does not calculate.
• The suggested strategies are general education, not legal or tax advice, and do not account for your specific situation, existing trusts, or how your state actually applies its exemption.

Open the estate value lab

• The federal estate tax exemption used is $15 million per person, the figure for deaths in 2026 (IRS Rev. Proc. 2025-32). It adjusts for inflation each year after 2026.
• The state inheritance tax list covers a small set of states that actually have one. Most states, including large ones like California and Texas, have no inheritance tax at all.
• Full step-up in basis is applied to stocks and real estate here; retirement accounts get none. Real tax treatment can be more specific depending on account type and whether it's a Roth or traditional account.
• The new basis row shows the value at the date of death, which becomes your cost basis for stocks and real estate. This page does not estimate the capital gains tax that avoids; the chapter 18 lab does, at a sample 20% rate. Federal long-term rates are 0%, 15% or 20%, plus a possible 3.8% surtax.
• Prior lifetime gifts reduce the available federal exemption in this model, which matches how the real exemption works, but tracking your own prior gift totals accurately is on you.

Open the inheritance tax lab

• The estimated premium is this lab's own illustrative formula: coverage / 1,000 x a base rate ($0.10 term, $0.50 whole life, $0.40 universal life) x (1 + 0.02 x (age - 20)) x a health factor x 2.5 if you smoke. The health factor comes from age, health status, smoking status and family history. Occupation is not used. It is not a quote from any insurer and will not match one.
• Education cost per dependent is a flat estimate, not tied to a specific school type or your state's cost of college.
• Years of income to replace is a number you choose, not a life expectancy calculation. The lesson's 10 times income starting point equals 10 years. A household with young kids may choose longer.
• Existing coverage you already hold is not automatically netted out unless you enter it, so check that field before reading the recommended total as a gap.

Open the life insurance needs lab

• Target percentages across all your holdings need to sum to 100%; the calculator flags an error if they don't.
• Transaction costs are estimated at a flat 0.1% of the traded amount, which is higher than many commission-free brokers actually charge and lower than what a fund with a sales load would cost.
• It doesn't account for capital gains tax on a sale in a taxable account, which can outweigh the benefit of getting back to your exact target.
• Current values are whatever you type in; the calculator doesn't pull live prices or balances from a brokerage.

Open the portfolio rebalancing lab

• Premiums here are this calculator's own simplified model based on type, location, age, deductible and risk factor count. They are examples, not quotes from any insurer.
• The target of 1.5 times net worth, or $1 million above $100,000 of net worth, is a sample for planning. No primary source sets the 1.5 multiplier. It is not a legal requirement or a guarantee against being sued for more.
• Risk factors add a flat percentage to the premium per factor. A real underwriter weighs each factor differently.
• The renters type prices contents at 1% of their value in this lab's model. Landlord-specific liability rules are not modeled separately from the general rental property type.

Open the property insurance lab

• Vacancy is applied as a flat percentage of potential rent every month, rather than modeling the real pattern of a unit sitting empty for a stretch and full the rest of the year.
• The mortgage figure you enter is a single monthly number; the calculator does not separately track how much of any given payment is interest versus principal, it estimates principal at a flat 20% of the payment for the five-year projection only.
• Property appreciation is fixed at 3% a year for that same five-year projection, which will not match any specific market's real behavior.
• No income tax, depreciation deduction, or capital gains treatment on eventual sale is modeled. Those can materially change a rental's real after-tax return.

Open the rental property lab

• Balances grow at a flat 7% annual return for every account type, which won't match any single year's real market performance.
• The tax-savings figure uses only your current federal marginal bracket. It ignores state tax, and it ignores that a large pre-tax contribution can itself push you into a different bracket.
• Contribution limits shown in this tool reflect the account type you pick; check them against the current-year IRS limits before assuming they're up to date.
• It doesn't account for required minimum distributions, Social Security taxation, or Medicare IRMAA surcharges, all of which affect which account you'll wish you'd used.

Open the retirement account order lab

• A five-question quiz is a rough proxy for actual risk tolerance, not a substitute for a real conversation with a financial advisor about your specific situation.
• The expected return and volatility shown for each profile are fixed assumptions built into the tool, not a forecast for any specific fund or account you hold.
• The age adjustment moves your stock share by a fixed amount for your age range (between 20% and 90%) and gives the rest to bonds, keeping at least 5% in bonds. International and REIT shares stay at the profile's base amount.
• Your answers reflect how you feel about risk when you take the quiz, which many investors report changes after a large market decline, often toward more caution than a calm-market answer would suggest.

Open the risk tolerance lab

• Tax brackets are 2026 federal brackets only; state income tax on the conversion isn't included, and several states tax conversions.
• The lab shows a break-even retirement tax rate: the conversion tax divided by the amount converted. It does not compute break-even years or a year-by-year payback.
• It assumes you pay the conversion tax from funds outside the IRA. Paying it from the IRA itself reduces the amount converted and changes the math.
• It doesn't model IRMAA (Medicare premium surcharges), the loss of income-based credits, or how a large conversion in one year can temporarily inflate your bracket beyond what a multi-year conversion plan would.

Open the roth conversion lab

• The 30-year lifetime impact figure treats the raise as a flat, unchanging annual amount for three decades. It does not account for future raises building on top of it, inflation, or job changes, so treat it as an illustration of scale, not a real projection.
• The confidence score is a simple point system built from a handful of factors. It is not based on data about actual negotiation outcomes at any company or in any industry.
• It has no idea what your role, location, or industry actually pays. A 15% ask can be conservative or wildly aggressive depending on how far behind market your current salary already is.
• Whether you've told the calculator you did market research doesn't check that the research was good. Checking the box adds 10 points regardless of what you actually found.

Open the salary negotiation lab

• Every goal uses the same expected interest rate you enter, even though a near-term goal in a savings account and a longer-term goal in a different vehicle would realistically earn different rates.
• Months remaining is estimated using 30-day months from today's date, so the figure shifts slightly depending on when you check it.
• Budget allocation across goals is a simplified priority-and-urgency ranking, not a true optimization; it won't necessarily produce the mathematically best split of a limited budget.
• It doesn't account for taxes on interest earned in a taxable savings account.

Open the savings goal planner lab

• Revenue potential for each preset idea is a single estimate, not a range. Real freelance writing income, dropshipping revenue, or tutoring demand varies enormously by skill, niche, and effort, far more than a fixed number can capture.
• Scaling revenue in direct proportion to your available hours assumes the work splits evenly across hours, which isn't true for ideas with a fixed setup phase (building a course, launching a store) that has to happen regardless of your weekly hours.
• No income tax, including self-employment tax, is deducted from any profit figure shown. The profit, hourly rate, and ROI here are all pre-tax.
• The 5% discount rate used for net present value is a fixed assumption, not tied to your actual cost of capital or what else you could do with the same money and time.

Open the side hustle roi lab

• The discounted cash flow model assumes free cash flow grows at a single, constant rate for five straight years, which real companies never do smoothly.
• Industry P/E, P/B and PEG figures are numbers you type in yourself; the calculator doesn't look up or verify current industry averages.
• The blend weights, 40/30/20/10, are fixed. A company with an unusual balance sheet, one with very little book equity from years of buybacks, for instance, can get pulled toward far above model value largely because of the P/B leg, even if its cash flow looks reasonably priced.
• Revenue and revenue growth don't change the value estimate. They drive two risk notes: slow revenue growth, and a thin net profit margin (net income divided by revenue).

Open the stock valuation lab

• Figures here are 2026 standard deduction amounts; check the deduction you're comparing against matches the tax year you're actually filing.
• The SALT cap ($40,400 for 2026, $20,200 married filing separately) is applied as a flat cap. The real cap shrinks for incomes above $505,000, and the mortgage interest rules depend on when the loan originated.
• Medical expenses count only above 7.5% of the AGI you enter. It doesn't model the AGI-based limits on charitable deduction percentages, which can reduce what you can actually claim.
• It assumes your marginal rate stays constant across the deduction gap, which is only true if the gap doesn't cross into a different tax bracket.

Open the tax deductions lab

• It doesn't distinguish short-term losses from long-term losses, even though the two offset different kinds of gains under actual tax rules.
• Transaction costs are a flat number you enter per trade, not a real bid-ask spread or commission schedule from a specific broker.
• Wash-sale risk here is a simplified flag based on your inputs, not a check against your actual trade history or the securities involved.
• It assumes the tax bracket you entered holds for the whole year; harvesting late in the year against a bracket that's about to change won't be caught. It also does not value the carryforward in later years, and harvesting lowers your cost basis, so it mostly moves tax to a later year rather than removing it.

Open the tax-loss harvesting lab

• Every asset compounds at one steady annual rate for the entire trust duration; a home's value and a small business's value do not actually move in straight lines.
• The estate tax figure uses a flat 40% federal rate above the exclusion. The real tax is graduated, and a married couple can combine two exclusions, so treat the output as a rough ceiling, not what you would owe.
• Trust setup costs (attorney fees to actually create the document) are not included, only the ongoing annual maintenance figure the calculator assigns to each trust type.
• State-specific rules on trust taxation, creditor protection, and Medicaid planning vary enormously and are not modeled. Some states charge their own estate or inheritance tax with much lower exemptions than the federal one.

Open the trust planning lab

• The $200-per-million baseline premium and its risk adjustments are this calculator's own simplified model, not a rate from any insurer.
• The coverage tests (assets, net worth, income multiple, $1 million floor) are sample planning figures. No primary source sets the multipliers. They are not a legal minimum or a court-tested guarantee.
• Underlying auto and home liability limits usually have to meet an insurer's minimum before they will even sell you an umbrella policy on top; this calculator does not check that requirement.
• Occupation and public-profile multipliers are broad categories. A high-profile local business owner and a low-profile one in the same job title get different multipliers here, but real underwriting looks at the specific exposure.

Open the umbrella policy lab

• Each simulated annual return is drawn from a normal distribution around your expected return and volatility. Real market returns aren't normally distributed and cluster more than this model assumes.
• It doesn't model taxes, required minimum distributions, Social Security, or any other income source; the withdrawal comes entirely from the portfolio you entered.
• 1,000 simulations is enough to give a rough success rate, not a precise probability; running the same inputs again will give a slightly different number each time.
• The strategies are simplified versions of real approaches. A real bucket or bond-ladder strategy involves rebalancing decisions this tool doesn't model.

Open the withdrawal strategy lab

• IRS Tax Withholding Estimator
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• CFPB: start small, save up

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• Investor.gov: save and invest
• Investor.gov: assessing your risk tolerance

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• IRS retirement contribution limits
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• Social Security delayed retirement credits

• IRS 2026 tax adjustments
• IRS investment income and wash-sale rules
• IRS business mileage rates

• IRS 2026 HSA limits

• CFPB: owning a home
• Investor.gov: REITs

• Investor.gov order types
• FINRA stocks and their risks

• Investor.gov: bonds and fixed income
• TreasuryDirect savings bonds

• SEC REIT structures and distributions
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• Investor.gov crypto asset risks
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• SBA business guide
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• IRS estate tax instructions
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