Washington (CNN) A new, bipartisan investigation into the consequences of the last three government shutdowns reveals that the cost of political intransigence was roughly $4 billion to US taxpayers.

The number comes from the Senate Homeland Security and Government Affairs Permanent Subcommittee on Investigations, which worked for months to compile a full accounting of just how much time, money and effort was wasted when the federal government shut down in recent years.

Of the $4 billion price tag, nearly $3.7 billion of it went to paying workers who were forced to stay home during the shutdown.

The other $338 million came from costs associated with the shutdown like administrative work, lost revenue and late fees on interest payments, the report states.

By combining the number of days federal employees were out of work, the report estimated the shutdowns cost federal agencies 56,938 years of lost productivity.

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