Before you start investing, before you amortise extra, before anything else: build an emergency fund. It is money that just sits and waits, ready for the day the washing machine dies or you lose your job. It feels dull to save towards something that does not grow, but the buffer is what lets everything else in your finances stay calm.
Aim for three to six months of expenses in a savings account with a deposit guarantee and some interest, kept separate from your everyday account. Never in funds or on an ISK: the buffer must not be able to drop in value just when you need it. Build it with an automatic transfer on payday, and top it up again every time you use it.
I will cover why the buffer comes first, how much you need, where it should sit and how to build it even when money is tight.
Why the buffer comes first
Life sends bills you did not plan for: a dentist, a smashed phone, a month without work. Without a buffer you cover them with a card or a quick loan, and one unforeseen cost becomes the start of an expensive debt. With a buffer the same event is just an annoyance. The buffer is also what lets you invest calmly: with money set aside you never have to sell your funds when the market is down because the car broke. That is why it comes before everything else.
How much you need
The rule of thumb is three to six months of expenses, but start smaller. Konsumentverket, the Swedish Consumer Agency, tends to point to a small starter buffer of a few thousand kronor just for the most common knocks, and that is an excellent first goal. After that you build towards three to six months depending on your situation: with a permanent job, a partner who also works and no children, the lower end is fine; if you are on your own, have irregular income or dependents, aim higher. The point is months of expenses, not months of salary; it is what you actually spend that matters.
Say you spend 20,000 kr a month. Then three months is 60,000 kr and six months is 120,000 kr. That sounds like a lot, but start with a first milestone of 20,000 kr and build from there. At 2,000 kr a month you reach that in ten months, and the full three-month buffer in about two and a half years. Small and steady beats large and never.
Where it should sit
In an ordinary savings account, kept separate from your everyday account so you do not spend it by accident, and with a deposit guarantee (the protection that secures your money up to just over a million kronor per bank if the bank collapses). Pick an account with a little interest if you can, but do not chase tenths of a percent: the buffer should above all be safe and reachable, not grow. And never put it in funds or on an ISK. The whole point of the buffer is that it is exactly as big the day you need it, and the market has an impudent habit of being down just when life goes wrong.
Buffer or pay off debt first?
A common question: if you have expensive debt, like a credit-card balance or a quick loan at a high rate, should you save or pay it off? My answer is both, in this order. Start with a small starter buffer of a few thousand kronor so you are not forced to borrow again at the next knock. Then throw everything you can at killing the expensive debt, because no buffer in the world gives you twenty or thirty percent return, but an expensive debt costs you exactly that. Only once the expensive debts are gone do you build the full buffer and start investing. A mortgage and other cheap, low-rate loans, on the other hand, you do not need to prioritise ahead of the buffer.
Build it on a tight budget
The trick is not to try to save whatever is left over, because there is rarely anything left over. Instead set up an automatic transfer to the savings account on payday, before the money can be spent. Start with an amount that does not hurt, even if it is small, and raise it when you can. Round sums from sold things or a tax refund can speed it up. See how fast the goal approaches in the savings calculator, and check the whole picture in the health check. A good habit is to raise the transfer a little every time your pay goes up; that money was never part of your everyday spending, so you will not miss it, and the buffer grows on its own.
When you have used it
The buffer is there to be used, so feel no guilt when a real unforeseen cost turns up; this is exactly what it was for. The only thing that matters afterwards is to top it up again, with the same automatic transfer that built it. A buffer that is used and refilled does its job; one you never touch out of fear, or one that is emptied and never refilled, does not.
My recommendation
My own buffer is the most boring account I have and at the same time the one I am happiest about. Start today, with any amount, in a separate savings account with a deposit guarantee, set up an automatic transfer on payday and forget it. The first milestone is a few thousand kronor; the end goal is three to six months of expenses. Once the buffer is there you can start investing with a calm mind, and that is when the money really starts to work. I have never regretted a krona I set aside, not even the years I never had to touch it; it is peace of mind you are paying for, and it is cheap. But the buffer first; it is the foundation everything else rests on.