I live in Finland and have a child in 5th grade (and another in nursery) here so I have experience of primary school here.
Some clarification on things mentioned in the thread, firstly when my daughter was in nursery it was definitely not the equivalent of reception/year 1 like someone on the thread said. It was all play and then just a little bit of 'pencil work' in the last year (learning how to hold and use a pencil), they didn't even learn the alphabet. Then preschool at 6 they spent the year focusing on a different letter of the alphabet each week, and a different number up to 20 each week, only towards the end of the year did they start to learn syllables which is the first step towards reading in Finnish. I would say preschool was more like reception in the UK. My son is at nursery now and it has changed since my daughter's day as in they are doing things in small groups like teddy bear maths, and language rich world which I guess is maths and literacy at some level.
They then start learning properly in 1st grade but just 4 hours a day (after school club is available and cheap for after that but not every area offers before school club, mine doesn't) to begin with, and that increases each year, now in 5th grade she does three 6 hour days, one 4 hour and one 5 hour.
They do a lot of exams throughout the school year and they get homework every day, now in 5th grade it can be quite a lot of homework. In upper school the workload is supposed to be quite a bit more and in Lukio (high school) it can be very heavy (not everyone goes to Lukio, about half go to vocational high school, some do joint vocational and Lukio)
One of the things considered to help is the free hot lunch for every child as hungry children don't learn as well. There's no option for packed lunches, everyone eats a hot healthy lunch and it helps them learn. Frequent breaks is supposed to help too.
PISA results have gone downhill, they started going downhill when Finland started modernising the system, to copy other countries. It was at its best when it was old fashioned sit down at desks in rows and listen to the teacher learning. People in my age group (mid to late 30s) were of the age that had the good teaching and it shows, especially in languages. Reading levels are going downhill, considered likely due to phones and the internet and suchlike but reading is still very popular, and still high levels of people reading actual newspapers.
Tax is not as high as a person earlier in the thread made out, you don't pay those tax levels on all your income and income tax is more progressive than UK tax so can be as low as 1% though municipal tax isn't (but there's a higher threshold before you pay it, I don't think I paid any municipal tax last year) and there's no council tax or ridiculously high childcare costs.