World 8 · Debt & borrowing · Lesson 7 of 10
Debt-to-income: how much is too much?
Comparing what you owe each month to what you earn is how lenders — and you — can see the strain.
6 min read · Level: Practical · Free — no account needed to read
The idea
Debt-to-income compares what you pay toward debts each month with what you earn each month. If debt payments take a third of your income, your debt-to-income is about a third. Lenders use this measure to judge whether you can afford more borrowing, and it is equally useful for judging your own strain.
There is no single right level, and lenders in different countries use different limits. In general, the higher the share, the less room there is for savings, for surprises and for changing your plans. A rising share over time is a signal to pause new borrowing and focus on repayment.
Why it matters
Debt-to-income turns a vague feeling of being stretched into a number you can track and improve.
A real example
- The situation
- Ola feels stretched but cannot say why; each of her debts seems manageable on its own.
- What happened
- She adds up her card, car and phone payments and finds they take nearly half of her take-home pay. She stops new borrowing and targets the smallest debt to free up monthly room.
- The takeaway
- Looking at the total revealed a strain that no single debt showed.
How people actually behave
People judge each debt separately, and each looks affordable. The strain only appears when they are added together.
Common mistakes
- Judging each debt on its own instead of the total.
- Taking on new debt when a large share of income already goes to repayments.
- Assuming a lender approving you means you can comfortably afford it.
Questions to think about
- What share of your monthly income goes to debt repayments?
- What would that share need to be for you to feel comfortable?
Try it: Calculate your share
- Add up every monthly debt payment.
- Divide by your monthly take-home income.
- Decide whether to hold, lower or keep that share, and track it each quarter.
Words in this lesson
- Debt-to-income — The share of your monthly income that goes to debt repayments.
Continue learning
- Loans, installments, secured and unsecured — The common shapes of borrowing, and what a lender can take if repayments stop. (7 min · Foundation)
- Repayment strategies and refinancing — Snowball, avalanche and the basic idea of refinancing — and how to choose. (8 min · Practical)
- What debt is — and the limits of “good” vs “bad” — Borrowing moves future income into the present. Labels like good and bad debt only go so far. (6 min · Foundation)