LUXEMBOURG—European Union finance ministers agreed on Friday a draft law aimed at tackling the problem of too-big-to-fail banks and shielding taxpayers from having to bail out large lenders.

The compromise, which still has to be agreed by the European Parliament, isn't as far-reaching as the rules proposed by the European Union's own experts a few years ago. In contrast to the U.S. Volcker rule, which bans all banks from proprietary trading, Friday's compromise would require the bloc's 30 largest banks to split of such trades from their regular business.

The planned law, which would apply to banks whose trading activities exceed €100 billion ($113 billion), is aimed at addressing the problem of so-called too-big-to-fail banks, which have benefited from lower funding costs because investors assumed governments would bail them out rather than let them collapse.

Europe's 30 biggest lenders include Barclays PLC, Deutsche Bank AG and France's BNP Paribas.

EU finance ministers, who gathered for their monthly meeting in Luxembourg on Friday, backed the regulation, which could force banks to rein in the proprietary trading and give national regulators the power to sp lit off risky trading activities from safer lending operations.

"We have today reached a sensible and pragmatic and proportional compromise," said Jonathan Hill, the European Commissioner for financial affairs.

The draft law "gives us another piece in the jigsaw of securing financial stability," Mr. Hill added.

It seeks to harmonize laws that have already been adopted in several EU countries to deal with too-big-to-fail institutions.

But in an apparent concession to the U.K., the law would exempt countries if they already have similar legislation in place on curbing trading risks and splitting their bank. The U.K. introduced the 'Vickers rule,' which calls for banks to "ring-fence" their retail-banking businesses from investment-banking activities.

Many banks have also warned that any radical move to break them up might harm their ability to support Europe's weak economic recovery, and spark an exodus of business toward more favorable jurisdictions.

The commission proposed the new rules as part of a lengthy overhaul of Europe's banking system in the wake of the financial crisis, a process that encompassed larger capital cushions, bonus caps for bankers and plans for a eurozone banking union.

Even though it has the backing of the 28 EU countries, the draft law still has to be agreed by the European Parliament and can change. European lawmakers failed to reach a common position on the regulation in late May and are still working on reaching a consensus.

Write to Viktoria Dendrinou at viktoria.dendrinou@wsj.com

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