How to track income and expenses: a simple system for your personal finances

There are three ways to record money, plus a fourth if you let your bank do the typing. Pick the one you will actually open every day, not the one that looks most impressive.

If you have never tracked before, a manual method is the better teacher: noticing each purchase is what changes spending. If a spreadsheet already failed you, read how to track expenses without a spreadsheet. If you decide on an app, our guide on how to choose a money tracker app for iPhone lists what to check first.

Accounts are where your money lives: cash, a debit card, a credit card, a savings account. Write down the current balance of each one before you start. Moving money between them, for example from checking to savings, is a transfer, not an expense, so record it separately or your spending will look higher than it is.

Categories answer the question you actually care about: where does the money go? Start with 8 to 12. Fewer, broader categories make the monthly totals easy to read. A set that fits most households:

• Housing: rent or mortgage, utilities, internet
• Groceries
• Eating out and coffee
• Transport: fuel, public transport, taxis, parking
• Health: pharmacy, doctors, gym
• Subscriptions and phone
• Shopping: clothes, household items, electronics
• Fun: hobbies, cinema, travel
• Kids and pets
• Gifts and donations
• Other

For income, three categories are usually enough: salary, side income and other. Two rules keep categories useful. Split by decision, not by store: a supermarket trip for snacks and wine is groceries plus fun, if that is what you want to see. And if "Other" grows past about a tenth of your spending, give its biggest item its own category.

For the first month, just track. Don't set limits yet, because you need real numbers before you can plan with them. Once you know where the money goes, choose one framework you can explain in a sentence. These are options, not rules:

• The 50/30/20 rule. Split take-home pay into 50% for needs (housing, groceries, bills, transport), 30% for wants (eating out, hobbies, shopping) and 20% for savings and paying off debt. On $3,000 a month that is $1,500, $900 and $600. In an expensive city, needs often take more than half; a 60/20/20 split is still a plan.
• Pay yourself first. On payday, move a fixed amount, say 10%, to savings before you spend anything. Whatever is left is yours to spend without guilt. Simple and hard to break.
• Envelopes. Give a few flexible categories such as groceries, eating out and fun a fixed monthly amount. When an envelope is empty, that category is done for the month. It works with real cash or with numbers in your notes.
• Zero-based budget. Assign every unit of income a job before the month begins until nothing is left unassigned. The most control, and the most effort.

Whatever you choose, plan for irregular costs too: insurance, car repairs, holidays, annual subscriptions. Add up a year of them, divide by 12, and set that amount aside every month so they stop feeling like emergencies.

Tracking without looking is just bookkeeping. A short, regular review is where the savings come from:

• Every day, a few seconds: record each expense when it happens. Memory at the end of the day misses the small things, and small things add up.
• Every week, about 10 minutes: check that nothing is missing, fix wrong categories and glance at the biggest ones. This is when you can still change something this month.
• Every month, about 30 minutes: compare income with expenses, see how much you saved, compare categories with last month, and pick one thing to adjust next month.
• Once a year: look at the whole year, update your list of irregular costs and set a savings goal.

A useful monthly number is your savings rate: income minus expenses, divided by income. If it goes up from month to month, the system is working, whatever the individual categories say.

Most people stop tracking in the first few weeks, and the reason is almost always friction, not willpower. A few things help:

• Log immediately. Record the purchase while you are still at the checkout or in the café.
• Make entry take seconds. Keep the tool one tap away: a widget, a shortcut, a pen in your wallet. The slower the entry, the sooner you stop.
• Don't chase perfection. Round amounts. A forgotten coffee does not ruin the picture; quitting does.
• Catch up once a week. If you missed something, check your card statement during the weekly review instead of giving up.
• Attach the review to a routine you already have, such as Sunday breakfast or the day after payday.
• Change one thing at a time. One adjustment per month sticks better than ten resolutions.

A family budget works the same way, with one extra step: agreeing on the rules before the numbers. Things that help couples and families:

• Choose a model. Fully joint money, fully separate money, or "yours, mine and ours": a shared pot for rent, groceries and bills, with each partner contributing an agreed amount or a share proportional to income, and the rest kept personal.
• Decide who records what. One person can keep the records for the household, or each partner logs their own spending in shared categories. Both work as long as it is clear.
• Hold a monthly money talk. Twenty minutes with the totals in front of you: what went well, what surprised you, what to change. Talk about numbers, not blame.
• Keep personal allowances. A fixed amount each person spends without explaining avoids most arguments about small purchases.
• Set one shared goal. A holiday, an emergency fund, a deposit. A goal makes the tracking feel like progress, not control.
• Involve the kids. Pocket money with a simple record of what it was spent on teaches more than any lecture.

If you choose an app, Cashful is one convenient way to follow the steps above on iPhone, iPad, Mac and Apple Watch. It is a manual tracker built to make each entry quick: say "groceries 54 card" or snap a receipt, and Cashful fills in the amount, category and account for you to confirm. If you prefer typing, there is a calculator keyboard.

• Accounts, categories and transfers: income, expenses and transfers between accounts, each account in its own currency.
• Quick entry: Home Screen and Lock Screen widgets, Siri, the Action button, Back Tap and a free Apple Watch app.
• Privacy: no bank connection, no ads and no sign-up. Records stay on your devices and sync through your own iCloud.
• Free plan with no time limit: unlimited manual entries, income, expenses and transfers, up to 3 accounts and 2 currencies, iCloud sync, widgets, Siri and the Apple Watch app, plus 10 voice entries and 5 receipt scans to try.
• Cashful Pro: unlimited voice and receipt entry, full analytics with category ranking, cash flow and month comparison, CSV import and export, and shared Spaces where family members can see one budget (invitees have read-only access, and the owner adds entries). In the US it costs $2.99 a month or $29.99 a year, with a 7-day free trial.

When Cashful is not the right fit: if you want transactions imported from your bank automatically, if you use Android or Windows, or if you need to track investments.