Short, plain answers to the questions people actually ask — how the numbers work, and the trade-offs that decide them.
The 50/30/20 rule — half of take-home to needs, 30% to wants, 20% to saving — is a useful screening test, not a plan. High rents break the 50, high incomes hide undersaving in the 20; adapt the split honestly, and graduate to a real budget when a real goal appears.
Budget from a baseline month — your lowest realistic income — and pay yourself that amount as a monthly salary from a buffer account where all income lands. Good months fill the buffer, lean months draw on it, and windfalls get split by a rule you set in advance.
Most couples land on one of three systems — fully joint, fully separate, or a hybrid with a shared account for shared costs. The hybrid plus proportional bill-splitting fits the widest range of couples, but the system matters less than agreeing on it explicitly and reviewing it regularly.
Pull every card and bank statement for the last twelve months, list every recurring charge, and sort each into keep, downgrade, share, or cancel. The habit that matters most afterward is calendaring renewal dates, not the one-time cleanup.
Zero-based budgeting assigns every dollar a job and buys control at the cost of ongoing effort; pay-yourself-first automates savings and ignores the rest. Variable income and thin margins favor zero-based; steady salaries favor automation — and a hybrid of the two beats either run rigidly.
Hold three to six months of essential spending — housing, food, utilities, insurance, minimum debt payments — not total spending. Two earners push you toward three; a sole earner, dependents, variable income, or a high-deductible health plan push toward six or more. Build a one-month starter first if you carry high-interest debt.
Compound interest is growth earning its own growth — each return joins the balance and the next return is calculated on the larger total. Time multiplies the effect more than rate does, which is why starting early beats saving harder, and why untouched debt climbs the same curve.
As a starting point, save 20% of your take-home pay. That figure is a default, not an answer — the number that matters is the one that clears your specific goals on your specific timeline.
A sinking fund converts a known irregular expense — an insurance premium, car repairs, gifts, travel — into a fixed monthly transfer. Divide the cost by the months until it's due. It keeps predictable bills out of your emergency fund and turns budget shocks into line items.
Ten percent of take-home pay is a floor, 20% is a good target, and above 30% you are buying years of freedom rather than just security. What counts as good depends on when you started and what you are aiming at.
A high-yield savings account at an FDIC-insured bank, kept apart from your everyday checking. It should be safe, liquid within a day or two, and boring — not invested, not locked up, and not "put toward the mortgage" where you cannot get it back out on demand.
The avalanche (highest rate first) always pays the least interest; the snowball (smallest balance first) delivers early wins that keep you paying. In a typical three-debt example the gap is about $970 over three years — real money, but smaller than the cost of quitting.
Good debt finances something that appreciates or raises your earning power, at a rate below what that money would otherwise return. Bad debt finances consumption at a rate above it. Most debt sits between the two, and the label can change with your circumstances.
Credit card interest accrues daily, the grace period exists only while you pay in full, and minimum payments shrink with the balance — which is why $6,000 at 20% takes over 20 years to clear at the minimum but five at the same payment held fixed.
The payment is a fraction of what a car actually costs each month once insurance, fuel, maintenance and depreciation are added in. Budget the full cost, not just the loan, and a shorter term on a cheaper car almost always beats a long term on a pricier one.
Consolidation is worth it only when the new rate, with fees included, beats the weighted average rate of the debts it replaces — and when the payment stays at or near its old level. Stretch the term or re-run the cards, and a genuine rate cut still costs you more.
You do not need 20% down. Conventional loans start at 3-5% and FHA at 3.5%, though anything under 20% usually means paying mortgage insurance until your loan balance falls far enough. Whether that trade is worth it is a math question, not a round-number rule.
Compare your mortgage rate — a guaranteed, largely tax-free return — against what you realistically expect a portfolio to return, discounted for risk. A wide spread favors investing; a narrow or negative one favors prepaying. Near retirement, low risk tolerance, or a high rate all tilt toward the guarantee.
A HELOC is a revolving, secured line against your home equity, usually variable-rate with interest-only minimums during the draw period. Your limit is set by loan-to-value caps, not by what you plan to use it for, and interest-only payments never touch the principal you drew.
Lenders cap what they'll approve using two debt-to-income ratios, then price in taxes, insurance, and often PMI on top of principal and interest. The number that comes back is the most you could borrow — not what you should actually spend each month.
Compare what never comes back on each side — rent versus mortgage interest, property tax, maintenance, and the return you give up on your down payment — not the payments themselves. The honest answer usually turns on how long you plan to stay, not which option looks cheaper this month.
Divide the closing costs by the monthly savings to get your break-even month, then compare that to how long you plan to keep the loan. A lower rate that resets a 22-year loan back to 30 can cost more in total interest than not refinancing at all.
A 401(k) is a payroll-deduction account your employer sponsors. You defer a share of each paycheck, the employer may match part of it, the money grows untaxed inside the plan, and how it is taxed on the way out depends on which of the two contribution types you used.
A 529 is a state-sponsored account that grows untaxed and pays out tax-free for qualified education costs. Contributions earn no federal deduction, though many states offer one. A non-qualified withdrawal is taxed and penalized only on its earnings portion, never on the money you put in.
A health savings account is the only account that is deductible going in, untaxed as it grows, and untaxed coming out — provided the withdrawal pays a qualified medical expense. That combination beats every other retirement container for money you will eventually spend on health care.
A required minimum distribution is the tax code collecting on a deferral. Each year past the start age, your prior year-end balance divided by a life-expectancy divisor must leave the pretax account and be reported as income. The divisor shrinks annually, so the required share climbs for life.
A Roth conversion moves pre-tax money into a Roth IRA and taxes it now rather than later. Done in a low-income year it fills cheap brackets deliberately, and five tax years after each conversion that amount becomes reachable without the early-withdrawal penalty.
The two accounts differ only in when tax is paid. At the same marginal rate on both ends they produce an identical after-tax result, so the decision reduces to one comparison — your rate on the dollar going in against your rate on the dollar coming out.
Benefits can start in any month from 62 to 70, shrinking by roughly 6% a year before full retirement age and growing 8% a year after it. Delaying is longevity insurance, not a bet on beating an average lifespan.
A coast number is your FIRE number divided by (1 + expected real return) raised to the years remaining. Reach it and the portfolio alone grows into your target — no further contributions required, only time and an assumed rate of return.
Withdraw 4% of a portfolio's starting value in year one, then adjust that dollar amount for inflation each year after, and history's worst 30-year stretch still left money on the table. It's a starting multiple to stress-test, not an instruction to follow blind.
Lean FIRE cuts spending to shrink the number, Fat FIRE raises it for a bigger lifestyle, Coast FIRE stretches the timeline so growth alone finishes the job, and Barista FIRE bridges the gap with part-time income. Same equation, four different levers.
Multiply what you actually spend in a year by 25, or higher for a longer retirement. The number tracks spending, not income — two households earning the same amount can need portfolios a million dollars apart, because they spend differently.
Convert each offer to take-home pay, subtract the housing and commuting costs it actually forces on you, then compare what is left over each month. The offer that lets you save more is the better offer, whatever the sticker salary says — large gross gaps routinely survive as almost nothing.
A raise is only a raise if the new salary buys more than the old one did. Divide one plus the raise by one plus the price change over the same period. Anything below the price change is a pay cut written as an increase.
Your marginal rate is what the next dollar is taxed at; your average rate is total tax divided by total income. Only income above a bracket threshold pays the higher rate, so the average always sits below the marginal. Decisions use marginal, scorekeeping uses average.
A pay stub subtracts in a fixed order — pre-tax deductions first, then Social Security and Medicare on one wage figure, income tax on a smaller one, then after-tax deductions. Knowing which base each line is computed on is what makes the gross-to-net gap reconstructable.
Income limits stop you contributing to a Roth IRA directly, but no income limit applies to converting. So you contribute to a traditional IRA without taking the deduction, convert the balance to Roth, and file Form 8606. The pro-rata rule is the one thing that breaks it.
A qualified medical expense incurred after your HSA was opened can be reimbursed at any point in the future, with no deadline. Pay from cash flow instead, keep the documentation, and let the account compound — the receipt stack becomes tax-free withdrawal capacity you can call on at any age.
A minority of 401(k) plans accept after-tax contributions on top of your regular deferrals. Move that money into Roth treatment promptly — by in-plan conversion or a rollover to a Roth IRA — and it becomes Roth savings far beyond the usual caps.
Realizing a loss in a taxable account offsets capital gains dollar for dollar, then up to $3,000 of ordinary income, with the rest carried forward. But the replacement position's basis resets lower, so most of the benefit is deferral — worth having, worth not overstating.
A financial health checkup is five numbers, not one — savings rate, emergency-fund months, fixed-cost share, debt-to-income, and net-worth trend. Run all five together every quarter, and fix whichever number is worst first, since fixing it often helps the rest.
Net worth is what you own minus what you owe, valued honestly rather than optimistically. Track it quarterly from a real balance sheet, use the trend rather than the number to judge progress, and treat age-based comparison tables as entertainment, not a benchmark.
Tracking works by closing the gap between what you believe you spend and what a statement shows — sorting purchases into categories turns a blended balance into visible trade-offs. The effect is strongest in month one and fades unless the review becomes a habit.
Every guide ends at one of these. If you already know the question, start here instead.
Connect your accounts and Hunch answers these questions with your real numbers, not a worked example.
Get started for free