Before You Spend a Dollar

Run the math on your paycheck

Find your most recent pay stub — the document, not just the deposit notification. If you don't have one yet, ask the person who runs payroll where you work. Every employer is required to give you one.

The pay stub has at least three numbers that matter for this milestone: gross pay (the deal), total deductions (the gap), and net pay (what landed). The net pay number is the one you allocate. Everything in this book operates on net pay, not gross.

Here's a worked example. Pretend you make $18 an hour and worked 32 hours over a two-week pay period:

Your numbers will be different. That's expected. State tax especially varies — nine states have no state income tax at all (Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, Wyoming). Federal withholding depends on your W-4 elections.

Three buckets: Save, Give, Spend

Now that you know the size of the pie, you decide how to slice it. The slices are called buckets, and there are three of them.

There is no universally correct split. A common starting point you'll see in personal finance writing is something like 10/10/80 — 10% save, 10% give, 80% spend — but the "right" mix depends on your values, your obligations, and your stage of life. Two thoughtful people with the same paycheck can pick very different splits and both be making a sound decision.

The case for "enjoy it now"

Both arguments are real. Most people land somewhere in the middle, and most people's middle shifts over time — heavier on spending in their teens and twenties, heavier on saving in their thirties and forties. There's no single right answer. There is a wrong answer, which is not deciding at all and letting "spend" take 100% by default.

Picking your starting split

For this milestone, write down a starting split — three percentages that add to 100. Don't overthink it. You can change it next paycheck. The point is to have one.

If you want a defensible starting point: many financial advisors suggest at least 10% to savings as soon as you're earning, and many faith traditions and giving frameworks suggest around 10% to giving. That leaves 80% for spending, which is plenty of room for a teenager's life. But these are conventions, not commandments.

Meet the accounts: Roth IRA, 401(k), Traditional IRA

If you've never opened anything beyond a regular bank account, this milestone is going to introduce you to three new ones. They have unfortunate names — abbreviations and section numbers from the tax code — but the concepts are simple, and once you understand them, you'll have the vocabulary every working adult eventually needs.

Before we compare them, here's the one idea behind all of them: the government wants people to save for retirement, so it offers tax breaks to people who save in specific accounts. The accounts are different flavors of the same idea — give up some tax now or later in exchange for tax-free growth in between.

What these accounts are not

A common misunderstanding worth clearing up first: a Roth IRA, a 401(k), and a Traditional IRA are not investments. They are containers. You open the container, put money inside, and then choose what investment to buy with that money — usually stocks, bonds, or index funds. The container determines how the money is taxed; the investment inside determines how the money grows. Skipping the second step is one of the most common first-time mistakes.

The Roth IRA

The 401(k)

The Traditional IRA

Side-by-side comparison

The time benefit (the most important section in this book)

Whichever account you choose, the single biggest factor in how much money you end up with is how early you start. Not how much you contribute. Not which fund you pick. Not even which account type. How early.

Here's why. Money invested in stocks has historically grown at roughly 7% per year on average, after inflation, over long stretches of US market history. (Past performance doesn't guarantee future returns — but it's the best estimate we have.) That 7% is small in any single year. Over 50 years, it's transformative — because each year's growth compounds on top of the previous year's growth. This is called compounding, and it's the closest thing to magic in personal finance.

This is the case for starting now, even with very small amounts. $50 a paycheck, started at 17, beats $300 a paycheck started at 35 — because time, not contribution size, is doing most of the work.

So which account should you pick?

For a first-job earner, the answer is usually one of these two paths:

One more thing worth knowing: even if you choose the Roth IRA path, the money inside the account doesn't have to stay locked up until 59½. You can withdraw the contributions you made (not the growth) at any time without penalty. This is unique to Roth IRAs and makes them flexible enough to use for emergencies if you ever truly need to. Don't plan to do this — but knowing the option exists makes the Roth less scary to commit to.

The math: five people, same paycheck, very different outcomes

This milestone is the one that, if it works, will stay with you. We're going to start with the simplest possible version of the question — one person who saves nothing, and one person who saves a small percentage — and then expand to a four-way comparison.

Two paths from the same paycheck

Same job. Same career. The only difference is whether they make a savings decision in advance, or skip it. Both people start with a part-time job at age 17 earning about $7,200/year, work their way up to a full-time salary of $50,000/year by age 25, and continue earning into their mid-careers as their pay rises gradually. (Average lifetime earnings: about $58,000/year.) They retire at 65. The numbers below show the steady-state version of what their working life looks like — once they've reached their typical mid-career salary.

That's the simple version. But "Spender vs Saver" hides some of the more interesting choices — when you start, which account, whether you capture an employer match, whether you give. Let's look at five people instead of two.

Meet the five

Setup. All five start their working life at age 17 with a part-time job earning $7,200/year. By age 25 they're earning $50,000/year. As their careers progress, their pay rises gradually to about $80,000/year by retirement age. Average lifetime earnings: about $58,000/year. They retire at 65 — a working life of 49 years. We'll assume 7% average annual returns on invested money (the historical long-run average for US stocks, after inflation, is somewhere around 7%) and taxes on traditional accounts paid at a 22% rate in retirement.

Employer match assumption. For the people who use a 401(k), we'll assume their employer offers a 3% match — the employer contributes 3% of gross salary as long as the employee contributes at least 3% themselves. This is a typical mid-range match in the U.S. (some employers offer more, some offer none).

Where they each end up at 65

What this looks like in real life

Lifetime numbers are easy to ignore. Daily numbers are harder to ignore. Here's what each saver's choices look like translated into everyday dollars — assuming a $50,000/year salary ($39,000/year take-home after about 22% in combined taxes), which is roughly what each of these people earns in their working years.

The columns: how much per year, per month, and per day goes to each bucket.

What the daily numbers tell you

The Spender's "extra" money is $11/day. Compared to the Roth Saver, the Spender has an extra $11 a day to spend. That's a fancy coffee. That's a third of a take-out lunch. It is the entire difference between $0 at retirement and $1.65 million at retirement.

The match is $4/day in free money. The 401(k) Saver and the Stacker both pick up an extra $4 a day from their employer's 3% match — about the cost of a Starbucks tea. Skipping the match, even when one is offered, means leaving roughly $1,500 a year in compensation on the table. Across a 49-year career, that's ~$86,000 of free money that compounds into nearly half a million dollars by retirement.

The Stacker spends $80/day instead of $107/day. The Spender lives on $107 a day. The Stacker lives on $80 a day — saves for retirement, gives to causes they care about, and still has $80 in their pocket every single day. That's not poverty. That's a normal week of groceries, a tank of gas, lunch with a friend, and money left over for the things they actually want.

The Stacker gives $14/day. Roughly the price of two coffees. That's what 10% of a $50,000 salary looks like in everyday terms — and over 49 years, those two coffees a day add up to $287,000 given to causes they cared about, without changing whether they retire wealthy.

What the table is telling you

The Spender vs. anyone who saves anything. The gap between $0 and any of the other columns is the largest gap on the page. Saving at all matters far more than picking the optimal account.

The Late Saver vs. the early savers. The Late Saver contributed a meaningful amount — almost a quarter million dollars over 36 years — but ends up with about $730,000 less than the early Roth Saver, and over a million less than the Stacker. That gap is entirely the cost of the 13 years they didn't save in their 20s. Time, not contribution size, did most of that damage.

The match is the most valuable thing on the table. The 401(k) Saver and the Roth Saver contributed the same amount of their own money — $287,000 each — but the 401(k) Saver also captured $86,000 in free employer match. That match is so valuable it overcomes the tax disadvantage of the Traditional 401(k): the 401(k) Saver ends up with about $23,000 more usable retirement money than the Roth Saver, despite paying $473,000 in retirement taxes that the Roth Saver doesn't.

The Stacker beats everyone. By putting the first 3% in the 401(k) (to capture the match) and the next 7% in a Roth IRA, the Stacker gets the best of both worlds — the free match and tax-free growth on the rest. They end up with $1,932,000 in usable retirement money, about $255,000 more than the all-in 401(k) saver and almost $280,000 more than the Roth-only saver. Same 10% saving rate. The split is doing the extra work.

The Stacker also gave away $287,000. This is the part of the table most worth sitting with. The Stacker had the same employee contribution rate as everyone else, captured the match, gave 10% of their income to causes they cared about, and still ended up with the most retirement money. Giving didn't compete with saving — it competed with the spending that the Spender used to buy a daily latte.

Open the account

This is the milestone where reading turns into doing. You're going to open a real Roth IRA. If you're under 18, it will be a custodial Roth IRA — opened in your name with a parent or guardian as the custodian until you turn 18 (or 21 in some states), at which point it converts to a regular account in your name.

Pick a brokerage

The major low-cost brokerages that offer custodial Roth IRAs as of 2026 include Fidelity, Charles Schwab, and Vanguard. All three have:

• No account minimums
• No annual fees on the account itself
• Commission-free trading on stocks and ETFs
• A wide selection of low-cost index funds

The differences between them are real but minor at this stage. Fidelity has the most user-friendly app and is currently popular with younger investors. Schwab has strong customer service. Vanguard is the original index fund company and has rock-bottom fund expense ratios. Pick one and move on — the brokerage matters far less than actually opening the account.

What you'll need

• Your Social Security number
• A government-issued ID (your driver's permit/license or passport)
• Bank account info to fund the contribution
• A parent or guardian's information (for custodial setup if under 18)
• Your earned income amount from your most recent W-2 or pay stubs (you can only contribute up to what you earned)

What to actually buy

Opening the account is one step. Funding it is another. Buying an investment with the money is a third step — and the one most first-time investors forget. Money sitting in a Roth IRA in cash earns close to nothing and defeats the purpose of the account.

For a first-time investor with a 40+ year time horizon, a single low-cost total stock market index fund is a defensible default. Examples include FXAIX or FZROX (Fidelity), SWTSX (Schwab), and VTSAX or VTI (Vanguard). These funds hold a tiny slice of essentially every public US company. You'll pay an expense ratio of 0.00–0.04% per year — pennies on the dollar.

This is not investment advice tailored to your specific situation. It is the most common starting point recommended by index-fund advocates from John Bogle (Vanguard's founder) onward. There are other defensible approaches — target-date retirement funds, total-world funds that include international stocks, three-fund portfolios. The book doesn't tell you which is best for you. Talk to a parent, a teacher, or a fee-only fiduciary advisor if you want a second opinion.

Inside the Give bucket: cheerful giving

The third bucket is the one most personal finance books skip. That's a mistake — for two reasons. First, almost everyone gives something over their lifetime, and people who give intentionally end up giving more, more effectively, and feeling better about it than people who give reactively. Second, the question of why we give is one of the more interesting questions a young person can sit with.

The phrase cheerful giver comes from a line in the New Testament — "God loves a cheerful giver" — and it's where the title of one of the books in this series, The Cheerful Giver, comes from. But the underlying idea — that giving works best when it's freely chosen and gladly given — shows up across traditions. Jewish tzedakah, Islamic zakat, secular philanthropy, effective altruism, mutual-aid traditions in many cultures, and family-and-community giving all converge on the same observation: giving that feels obligatory rarely lasts; giving that feels meaningful usually does.

Why give at all?

Different people answer this differently, and the differences are worth taking seriously:

You may agree with one of these, both, or neither. The book doesn't tell you which framework is correct. It does suggest that the question — "what do I owe to people other than myself?" — is one worth answering on purpose, not by default.

Three practical decisions

Once you've decided you want to give, you face three smaller questions:

1. How much? A common starting figure across traditions is 10% of income — the biblical tithe, the rough size of historical zakat, and the level promoted by some giving pledges. Others give a different percentage, give a fixed dollar amount, or give variable amounts based on circumstance. Pick something you can sustain.

2. To whom? Religious institutions, social-service nonprofits, education and scholarship funds, medical research, international development, local mutual aid, individuals you know personally. A 17-year-old's giving doesn't have to look like an adult's. It can be a single cause you care about deeply rather than a portfolio of fifteen organizations.

3. How often? Per paycheck (most consistent), monthly (most planned), annually (most reflective), or in response to specific moments and needs (most spontaneous). Many people use a mix — automated monthly giving as the baseline, with occasional larger gifts in response to events.

How to pick a recipient

If you're giving to a registered nonprofit, check it on a free service like Charity Navigator, GuideStar, or GiveWell (which does deep research on global health and poverty causes). Look at the percentage of their budget that goes to programs versus overhead, their financial transparency, and recent independent reviews. A high-overhead organization isn't automatically a bad one — some causes are genuinely expensive to operate — but it's worth understanding where your dollar goes.

For religious giving (tithing, zakat, etc.), the institution itself is usually the recipient and the question of effectiveness is handled differently — the giving is part of the religious practice, not a transaction to optimize.

What about the tax deduction?

You may have heard that charitable giving is tax-deductible. That's true — but with a meaningful catch.

Charitable contributions to qualified 501(c)(3) nonprofits can reduce your taxable income, but only if you itemize deductions instead of taking the standard deduction. The 2026 standard deduction is $16,100 for a single filer. To benefit from charitable deductions, your total itemized deductions (charity + state and local taxes + mortgage interest + a few other categories) need to add up to more than that.

For most first-job earners, that math doesn't work. You probably don't own a home, don't pay much state and local tax, and aren't giving tens of thousands of dollars. The standard deduction will be larger than your itemized total, so you take the standard deduction and the charitable contributions don't reduce your tax bill at all. After the 2017 tax law changes roughly doubled the standard deduction, only about 10% of taxpayers itemize.

So for most readers, the practical answer is: give because you want to, not because of the tax break. The tax break may matter later in life — if you become a homeowner with a large mortgage, or if your giving grows substantially — but it usually isn't the reason a young person should start giving. The Stacker example earlier in this book doesn't include any tax savings from giving, and that's deliberate: it's the realistic version of the math for someone in their first 10–15 years of working life.

If you want to dig into itemizing, donor-advised funds, or "bunching" giving across years to maximize deductions, those are real strategies for high earners and homeowners — but they're material for a later book, not this one. For now, give what you can sustain, to causes you care about, and don't let tax mechanics drive the decision.

Write your allocation rule

This is the final artifact of the book, and the most useful one. You're going to write a one-page allocation rule — a personal policy for what happens to every paycheck before you have a chance to think about it.

The reason for writing it down is simple: decisions made once, in advance, beat decisions made on the fly. If your rule says "10% goes to my Roth on the day my paycheck arrives," that's one decision. If you decide paycheck by paycheck, that's 26 decisions per year, each one fighting against whatever you happened to want that week.

What goes in the rule

Use the template in the workbook. At minimum, your rule should answer:

• What percentage of net pay goes to Save, Give, and Spend?
• Inside Save: how much to emergency fund (until target reached) versus Roth IRA (or 401(k) match)?
• Inside Give: which cause(s), and at what cadence?
• Inside Spend: any rules of your own — like "no purchases over $X without sleeping on it" or "subscriptions reviewed every six months"?
• What triggers a review of the rule? (Annually, when income changes by 25%, when life situation changes — you pick.)

An example rule

That's it. One page. Your version will look different — the percentages, the institutions, the reasoning. The point isn't to copy this; the point is to write yours and put it somewhere you can find it again.