The purchase price is not everything. The good news: the additional costs of a Swedish house purchase are easy to take in and usually much lower than in many other countries.
When you register the ownership in your name as a private individual, the stämpelskatt applies: 1.5 % of the purchase price (more precisely, of the higher of the purchase price and the tax assessment value). If a company, that is a legal entity, buys, the rate is higher (4.25 %). So for most private buyers the 1.5 % applies.
For the registration of your ownership with the land survey authority (Lantmäteriet), a small fixed administrative fee is added to the stämpelskatt. It is in the region of a few hundred kronor, a small item.
Unlike in some other countries, there are no notary costs and no agent's commission on the buyer's side when you buy directly from the owner. That keeps the Swedish purchase lean overall.
As a rule of thumb: add the stämpelskatt (1.5 %) to the purchase price, plus the small registration fee. That is the one-off addition. For cheap houses the truly relevant extra item is almost always not the tax but the renovation. You should factor that in from the start.
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