Mandatory rules (Swedish: tvingande regler) are provisions of the Swedish Companies Act (ABL) that apply whatever the owners have agreed. They cannot be overridden by a shareholders' agreement or the articles of association. They protect the company, owners and creditors. The opposite is non-mandatory rules.
One example is the requirements for the share ledger. The board of directors is responsible for keeping, preserving and making it available, and cannot contract that away. The principle of equal treatment is also based on mandatory rules.

Non-mandatory rules are provisions of the Swedish Companies Act that a company may depart from.
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The Swedish Companies Act (ABL) is the law that governs how limited companies are formed and run.
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The articles of association are the basic rulebook that governs how a limited company operates.
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The board's responsibility for the share ledger means ensuring it is kept, retained and made available.
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