"What I don't see can't hurt me"

The investors in the last chapter could afford to look away. If you don't check your pension for a month while the market's down, nothing happens as a result. The pension doesn't know you're not looking, and it'll recover or not regardless.

Household money isn't like that, and this is the most important fact in the book. Bills, fines, taxes and debts run on timetables. They have due dates, and after the due dates they have consequences, and the consequences are written down in advance. The envelope in the drawer isn't waiting for you. A clock started on the day it was posted, and the clock runs at the same speed whether or not you've read the letter.

Here are three timetables, taken from the government's own website. I quote them as they stood when I checked them in September 2026.

A parking ticket or penalty charge notice usually gives you 28 days to pay. In some cases the fine is reduced if you pay within 14 days. If you don't pay a penalty charge notice within 28 days, you get a charge certificate, and you then have 14 days to pay the original fine plus 50 per cent more. After that comes a court order demanding payment.

A late Self Assessment tax return brings an initial penalty of a hundred pounds. After three months there are additional penalties of ten pounds a day, up to a maximum of nine hundred pounds. After six months there's a further penalty of 5 per cent of the tax due or three hundred pounds, whichever is greater, and the same again after twelve months. Interest is charged on top.

If you miss a council tax payment, the council sends a reminder giving you seven days to pay. If you don't pay within the seven days, you lose the right to pay by instalments and have to pay the whole year's council tax at once. If that isn't paid within seven days, the council may take legal action, and its legal costs may be added to what you owe. Further on, it can take the money from your wages or benefits, or send bailiffs.

Look at the shape of all three. Each starts as a modest sum with a simple remedy. At each stage where the letter goes unanswered, the sum grows, the remedy gets harder and the tone gets worse. None of it depends on whether you read the letters. The law assumes you did. In the supermarket example the parking charge tripled in the drawer.

So an unopened bill isn't a sealed verdict that stays the same until you read it. It's closer to a parking meter running on a car you've forgotten about.

The same applies, more gently, to things that aren't penalties. An insurance renewal letter typically gives you a few weeks in which you could ring up, query the price or go elsewhere. After the renewal date the money has gone and you've lost the easy moment. A letter saying that a fixed deal on your energy or mortgage is ending gives you a window to choose a new one. If you miss the window you go on to whatever the default is, which is rarely the cheapest. A cheque, like the one from the water company, can go out of date. A refund you're owed may need claiming by a certain day.

This is why the comparison with the investors breaks down. Their not looking cost them nothing, because nothing in their situation depended on a response. Almost everything that arrives in a windowed envelope depends on a response. "What I don't see can't hurt me" would be true if money stood still while you weren't looking, but it keeps moving.

There's a reassuring side to this, which the later chapters build on. The early stage of each timetable is cheap and easy. A parking charge in its first fortnight is thirty-five pounds in the example, paid online in three minutes. A missed council tax payment dealt with in the first week costs nothing extra. The system is quite forgiving of people who respond early, and it's hard on those who don't respond. Whether you respond early or late mostly comes down to when you open the envelope.