Short answers
Questions people ask before they trust anyone
Each page here opens with the answer, in two paragraphs, before any explanation. If that is all you needed, you can leave. If you want the reasoning, it is directly underneath, along with the arithmetic behind any number.
These are the four questions that come up before anything else, usually in this order. They are short on purpose. When one of them needs a full treatment, the answer points at the guide that carries it.
All four share a shape, because all four are really the same question asked from different angles: how do I know when I am ready. The honest reply is that readiness is not a feeling, it is a small number of conditions you can check. Do you know what a normal month costs you. Is there cash you can reach in a day. Is anything charging you a rate no investment could plausibly beat. Once those are answered, the amounts and the percentages stop being frightening and turn into arithmetic.
- How much money do I need to start investing? Far less than most people assume. Plenty of accounts open with no minimum, and the real threshold is set by your cash buffer and any expensive debt, not by the account.
- How much should I save before investing anything? Enough to survive a broken car and a lost month of work without selling. For most households that lands between three and six months of essential spending.
- What percentage of my income should I save? The largest number you can keep up for two years without resenting it. Ten percent is a common starting point, and the direction matters more than the figure.
- What is dollar cost averaging, in plain words? Buying the same amount on the same day every month, whatever the price. It removes the timing decision, and the arithmetic of why is shown on the page.
If you want the long version
The guides these answers come from
Short answers are deliberately incomplete. These are the full treatments.
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Habits
How to build an emergency fund from scratch
The buffer that sits underneath every other answer on this page, sized and timed with real arithmetic.
8 minute read
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Foundations
Compound interest, explained without the formula
Why starting small and early beats starting large and late, shown across ten, twenty, thirty and forty years.
9 minute read
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Foundations
Investing for beginners, in reading order
The four decisions that actually change your outcome, and the ones that only feel important.
10 minute read
What counts as a good short answer
A short answer earns its place by being usable on its own. That rules out three things we see constantly elsewhere, and none of them appear on these pages.
- It does not open with a definition. Somebody asking how much they need to start does not want a paragraph about what investing is. The number, or the reason there is no single number, comes first.
- It does not hide behind it depends. That phrase is usually true and always useless by itself. If the answer depends on something, the page names what it depends on and gives you the way to check your own case.
- It does not sell the next click. Links inside an answer exist because the reasoning continues there, not because the page is trying to keep you moving.
Every figure quoted in an answer is arithmetic that has been worked rather than recalled, and each one carries the assumption it was worked under, because a compounding figure without a stated rate and a stated number of years is decoration rather than information. The longer version of that principle is in how these pages get written.
General education only. These answers do not know your income, your obligations or the rules where you live, and none of them is a recommendation to open an account or buy anything.