A listing at the Insolvency Service showed British National Party (BNP) leader Griffin was declared bankrupt at Welshpool and Newtown County Court yesterday.
"Being bankrupt does not prevent me being or standing as an MEP. It does free me from financial worries," Griffin tweeted.
"Party funds are not affected in any way. Our campaign in May will be our most professional yet and I will be lead candidate in the North West," he said.
"I am now turning the experience to the benefit of hard-up constituents by producing a booklet on dealing with debt. No surrender," Griffin said.
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Advice published by the Electoral Commission said bankruptcy in itself does not bar someone from being a member of the European Parliament or standing for election.
Restrictions are only triggered if an individual is made subject to a bankruptcy restrictions order or debt relief restrictions order.
The Insolvency Service said such orders had not been made in Griffin's case.