What Is an IOU? Meaning, Examples, and How to Write One
A plain-English guide to IOUs: what they are, how to write a valid one, whether they're legally binding, how they differ from a loan, and the alternatives.
Most of us don't have a money problem so much as a scattered-money problem. The £40 a friend still owes you lives in a text thread. The subscriptions quietly renewing each month live on three different cards. The credit-card balance you keep meaning to tackle lives in an app you avoid opening. simpleIOU exists to pull those three money worlds back together so you can actually see what's going on — and this blog is where we show you how.
simpleIOU spans three areas that rarely sit in the same place: IOUs between people, the money you've lent or borrowed from friends and family; subscriptions, the recurring charges that add up faster than anyone expects; and debt, the credit cards and loans you want to see the back of. Each one has its own habits and its own traps, so we've grouped every guide here under those three pillars. Start wherever the noise is loudest for you.
A few honest notes on how the app works, because it shapes the advice you'll read here. simpleIOU is cloud-backed with row-level security, so when you're signed in your entries are tied to your account and no one else can see them — and there's an optional guest mode if you'd rather keep things in your browser for now. We don't link to your bank. Nothing is pulled in automatically; you add what matters to you, by hand, which keeps you in control of the picture. And to be clear: simpleIOU is a tracking aid, not financial advice. The guides below are practical starting points, not recommendations tailored to your situation.
Below you'll find articles organised by pillar. If you're chasing a friendly repayment, start with IOUs. If your monthly outgoings have crept up, head to Subscriptions. If you're trying to choose a payoff strategy, jump to Debt. However you got here, the goal is the same: fewer scattered numbers, one place to see them, and a calmer relationship with your money.
A plain-English guide to IOUs: what they are, how to write a valid one, whether they're legally binding, how they differ from a loan, and the alternatives.
Three message templates for asking a friend to pay you back — plus how a shared record makes the follow-up feel like a fact, not an accusation.
The four ways people track lent money, ranked by effort vs reliability — and why a dedicated IOU record beats memory, notes and spreadsheets.
One running tally, settle at the end — here's a simple way to track who paid for what on a group trip, even across multiple currencies.
When you only need a one-sided private record of who owes you, a group app is overkill. Here's a Splitwise alternative that needs nothing from the other person.
A simple way to add up your monthly subscription spend — and why the yearly total is the number that finally makes people cancel.
A step-by-step way to find every forgotten subscription using your statements, app stores and email — no bank login required.
Log the end date the moment you start a trial and decide a few days early — a simple system so a free trial never quietly becomes a charge.
Snowball for momentum, avalanche for the lowest interest — a side-by-side comparison to help you choose which card to clear first.
Minimum payments can stretch a card for a decade. Here's the simple balance-APR-payment math, a worked example, and how to find your real payoff date.
The four numbers to track for every debt — and why one combined view of all your loans and cards changes how fast you pay them off.