The scene
The scene
Stella and Rosa each got mortgage approvals for $750,000 within the same month. Same combined income, similar deposit, similar lender.
Stella treated the approval as a target. She found a house at $740,000 and bought it. The mortgage repayment now takes 38 percent of her household income. She tells herself she is comfortable. She also has not put anything into savings or investments since the move. Holidays have become rare. The promotion she has been thinking about not chasing because of the stress, she is now definitely not chasing.
Rosa treated the approval as a ceiling. She looked at her budget honestly. She wanted the mortgage repayment under 28 percent of her income. That brought her budget to $520,000. She bought a smaller house in a less central area. The mortgage repayment is comfortable. Her savings rate has not changed since the move. She is still investing monthly. Holidays still happen.
Same approval. Same income. Two different definitions of what the bank's number meant. Five years later, Stella is house-rich and life-poor. Rosa has the house she wanted and the life she wanted.
What your brain just did
What your brain just did
Our minds treat the first big number we see as the right number, even when that number was an upper limit set by someone else for their own reasons. Stella is not careless. Her brain anchored to the $750,000 because that was the first concrete figure attached to the decision, the way all our brains do when a large number arrives before we have one of our own. This behaviour has a name: Anchoring.
What to do instead, in one move
What to do instead, in one move
The skill is to calculate your own number before the bank gives you theirs. What mortgage repayment, as a percentage of your monthly income, would leave room for savings, investments, occasional emergencies, and a life you actually want to live? That percentage, multiplied by your income, divided by the interest rate, gives you your own ceiling. The bank's ceiling is irrelevant once you have yours.
TL;DR
- Situation: The bank approves you for a mortgage amount. You start looking at properties near that amount.
- What your mind does: It anchors to the bank's number as the right number for you, even though the bank's number is the maximum it will lend, not the right amount to borrow (this is called Anchoring, see below).
- Consequence: Buying near the maximum approval often means mortgage repayments that crowd out savings, investments, and other goals for the life of the loan.
- What to do: Calculate your own number based on what percentage of your income you want the mortgage to take. Use that as your ceiling, not the bank's.
What to do
- Before any mortgage conversation, decide what percentage of your monthly income you want the repayment to take. Common targets range from 25 to 30 percent for comfortable.
- Multiply that percentage by your monthly income to get your maximum comfortable repayment. From that, calculate the loan amount that produces that repayment at current interest rates.
- Compare your number to the bank's approval. If the bank approved you for more, treat the gap as room you do not need to fill.
- For most people, the right mortgage is not the largest one they can get. It is the one that leaves room for the rest of their financial life.
What not to do
- Do not treat the bank's approval as a target. The approval is the bank's maximum, not your optimum.
- Do not stretch into a higher mortgage because "we will grow into the payment". Future-you is rarely the version that grew into anything.
- Do not assume that being house-rich is the same as being wealthy. A house you cannot afford to live in is not wealth.
A bank's mortgage approval is a ceiling, not a target. Treating it as a target turns a home into a financial cage.
Want to understand why this happens?
Anchoring is the brain's habit of locking onto the first number it sees and judging everything else against it.
When a bank says "you are approved for $750,000", that number becomes the reference point for every property you look at. A $520,000 house feels like settling. A $740,000 house feels like the obvious choice. The reference point is doing the work, not the comparison to your actual financial life.
This is not a failure of intelligence. It is how every human brain handles large numbers in unfamiliar contexts. The bank's number is the only concrete figure in the room. The brain reaches for it because there is nothing else to reach for.
What the research found
What the research found
Researchers ran an experiment where people were shown a random number between 1 and 100 before being asked to estimate something completely unrelated, like the percentage of African countries in the United Nations. The higher the random number people saw first, the higher their estimate. The number had nothing to do with the question. The brain anchored to it anyway.
In mortgage contexts, the bank's approval is anchoring at industrial scale. The figure is large, specific, and attached to the decision. The brain treats it as relevant input rather than as a maximum set by the lender for the lender's own risk tolerance.
The fix is to bring your own number into the room before the bank gives you theirs. Calculate from your income, your savings goals, and the life you want. Use the bank's approval as a permission, not as a recommendation.
"The brain weighs the first number it sees more than the numbers that follow, even when the first number was set by someone with different priorities." — Daniel Kahneman and Amos Tversky (paraphrased from Judgment Under Uncertainty, 1974)
This is called Anchoring. Tversky and Kahneman, Judgment Under Uncertainty: Heuristics and Biases (1974).
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