Understanding your accounts

An account is just a container

“Account” is another word that sounds heavier than it is. Every account is a container: a place where one part of your financial life is kept. You already use all of them — you have simply never had to name them in one list.

Aurora sorts them into those four groups on the Accounts screen because the four behave differently — and two of them, as we are about to see, are not holding your money at all.

Your money lives in more places than you check

Meet Sarah. She is not unusual: $4,000 in checking, $15,000 in savings, $500 in her wallet, $2,000 invested, and $800 owed on a credit card.

When Sarah opens her banking app, she sees $4,000. It is a true number and a small fraction of the story. Line the containers up and the real picture appears:

That last figure has a name — net worth. Everything you hold, minus everything you owe. It is the only number that answers “how am I actually doing?”, and you cannot get anywhere near it from one bank balance.

Two kinds of account, and the difference matters

Split the containers down the middle and the whole thing gets simpler. Some accounts hold what you have. Some record what you owe.

So when a card shows −$800, no bank has lost anything. It means you owe the card company $800. Aurora shows those as an amount owed rather than a negative balance, because that is the honest way to read it — and it subtracts them from your net worth automatically.

Money moving between containers is still not spending

Worth one line, since we spent a whole section on it in Chapter 2: when $1,000 goes from checking into savings, checking drops, savings rises, and your total is unchanged. That is a transfer — a change of container, not a purchase — and it never touches your spending totals.

Accounts are exactly what makes that distinguishable. Without them, money leaving your checking account looks identical whether it went to your savings or to a shop. Chapter 2 has the long version.

A credit card is not a bank account with a minus sign

This is the account type that confuses everyone, so it is worth going slowly. You buy dinner for $80 on your card. The restaurant is paid. Your bank balance does not move at all.

Your bank balance is identical and you are $80 poorer. That is the trick a credit card plays, and it is why a card needs to be its own account rather than a payment method bolted onto your current account.

The other thing a card has that a bank account does not is a calendar:

Aurora tracks that calendar for you, per card — when the statement closes, what is due, when it leaves, and whether the account paying it will actually have the money on the day:

Paying the card is settling up, not spending again

Six days' notice was enough: you move $700 across from savings, and on the 15th the $1,240 goes out on schedule. Nothing new has been bought — that spending happened weeks ago, one dinner and one supermarket run at a time.

Look at the bottom row: it does not change. A card payment moves money between two of your own containers, exactly like a transfer to savings — cash down, debt down, position identical. If your app counts it as spending, your month will look $1,240 worse than it was, and everything you already bought gets counted twice.

What Aurora needs to know about an account

Less than you would think. Adding one takes about twenty seconds:

The balance field is the one people brace themselves for, and it is the easy one. You do not import ten years of history. You tell Aurora what the account holds today, and from that point the balance moves with the transactions you record. Your history builds forward from the day you start.

Which digits? The ones your receipts print.

The digits are what let a photographed receipt find its own way to the right account — no picking from a list, no wondering later which card paid for dinner. Which is why Aurora asks for both ends of the card number, and expects you to fill in only the one you actually see:

Most of the world prints the trailing digits, so that is the usual answer — with American Express the odd one out at five rather than four. A few countries do it the other way round: a Korean domestic receipt typically shows the leading four, which is useless to an app that only ever asked you for the last four.

So fill in the end your receipts show, leave the other blank, and move on — neither field is required and neither depends on the other. The one case for filling in both is the one expats and frequent travellers actually live in: your card gets used in a country that prints the first four and one that prints the last four. Give Aurora both and receipts from either place resolve to the same account on their own.

Credit cards ask for a little more, because of that calendar: the day the statement closes, the day payment is due, whether auto-pay is on and for how much, which account pays it, and your credit limit. Set once, and it drives the projections for as long as you hold the card.

If your life spans more than one country

Most finance apps assume you live in one place and hold one currency. If that is not you, this is the section that matters.

Aurora keeps one ledger per country, each locked to its own home currency. Your Hong Kong accounts sit in your Hong Kong ledger, your Korean accounts in the Korean one, and nothing is ever quietly added together into a total that does not exist in the real world. You switch between them; you never blend them.

Inside a ledger, an account can still hold a different currency — a USD savings account at a Hong Kong bank is perfectly normal, and spending on it converts at the day's rate while keeping the original amount. And where one bank relationship spans several accounts, Aurora groups them the way your bank does:

You do not have to set all of this up today

If you are starting out, do not try to model your entire financial life on a Sunday afternoon. Almost everything you want to know comes from the first two accounts.

1. 1️⃣The account your salary lands inOne account, one balance. You can already see money in and money out.
2. 2️⃣The card you actually spend onThis is where most of the interesting spending is hiding. Now you can see it.
3. 3️⃣Savings, when you want the full pictureAdds your real position rather than just this month's flow.
4. 4️⃣Cash, investments and loans — eventuallyAdd them when you want net worth to be accurate. There is no rush, and no penalty for waiting.

The goal is not a complete model. It is less confusion than you had last month, and then a bit less again.

Accounts are the foundation for everything else

Once accounts make sense, the rest of personal finance stops being vocabulary and starts being obvious:

• Income — money arriving into one of your containers.
• Expenses — money leaving your containers for good.
• Transfers — money moving between two of your own containers.
• Card purchases — spending that fills the “owe” container instead of emptying a “have” one.
• Card payments — draining the owe container from a have container.
• Investments — money moved into a container that can grow on its own.
• Net worth — everything in the have containers, minus everything in the owe ones.

Every one of those is the same handful of containers with money moving between them. That is the whole system.

Your journey so far