What to do with a year-end bonus, and why December is not a normal month
A year-end bonus is almost never spent badly. It is spent without deciding, which is different and ends the same way.
In short
A year-end bonus is allocated before it arrives, not after. December costs 30 to 60% more than a normal month, so part of it is already committed even though nobody assigned it. An order that works: first what December will cost extra, then the most expensive debt you carry, then January, and only what is left is free.
Every piece of advice about a thirteenth salary says the same thing: split it in three. The advice is not wrong, it is incomplete, because it skips the question that decides everything else: how much of that money is already spent before it lands.
December is not a month, it is a month and a half
Presents, the dinner, the office night out, the trip, the year-end tips and closing costs. None of those exist in March, and all of them exist in the same month.
A typical December costs 30 to 60% more than an ordinary one. If your bonus is one month's pay, a good part of it already has a purpose: holding December up. What is left after that is what you can actually allocate.
+30-60%
What December costs extra
Presents, meals, travel and year-end costs, all in the same month
1 order
Before it arrives
December's extra, the most expensive debt, January, and only then the free part
January
The part nobody reserves
School, annual taxes and insurance, in a month with no second pay behind it
The order matters more than the percentages
You do not need a split in thirds. You need a sequence, because each step changes what is left for the next.
- What December costs extra. Calculate it, do not estimate: look at what last December cost you. If you keep records, the number is there. If not, this is the year that makes next year's number exist.
- The most expensive debt. Only the kind charging high interest. Paying an interest-free instalment early saves nothing.
- January. See below.
- What is left. Only here is it free, and by this point there is no guilt in spending it.
January exists
This is the most expensive mistake and the most common. January brings the return to school, annual taxes and insurance, and it usually arrives after a December that ate everything. And it is the one month of the year with no second pay behind it.
Setting aside in December what January will ask for is what separates a year that starts calmly from one that starts with the card at its limit. It is not saving: it is a bill you already know about, paid early.
The mistake of treating it as a prize
A year-end bonus is not a performance award: it is part of your annual pay, handed over in one go. Thinking of it as a prize makes it get spent like a prize, and that is where it disappears.
A small and very effective reframe: add it to your income for the year and divide by twelve. That is your real monthly pay. The bonus is the part of that pay you receive in a month that also costs more.
How to know what your December costs
If you keep expense records, open last December and compare the total with an ordinary month of the same year. The difference is your number, and it is far more useful than anyone's average.
If you do not, start now: you will estimate this December by eye, but not the next one. How to plan your financial year covers the rest of the calendar — the annual costs that do not fall every month, and how to spread them.
Common questions
- How much of a year-end bonus should I save?
- No percentage fits everyone, because it depends on what your December costs and whether you carry expensive debt. The order matters more: December's extra first, then interest-bearing debt, then January, and what remains is free.
- Should I use a year-end bonus to pay off debt?
- Only the kind charging high interest, and that before anything else. Paying interest-free instalments early saves nothing, because there is no interest to avoid.
- Why set money aside for January when nothing has happened yet?
- Because January brings the return to school, several annual taxes and insurance renewals, and it is the only month with no second pay behind it. Reserving it in December is not saving: it is paying early for something you already know is coming.
Try it on your own money
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