Sen. Bernie Sanders loves to rail against the billionaires, but he made it into the millionaire class in 2016.

His new Senate financial disclosures, first reported on by Vermont alt-weekly Seven Days, show that in 2016 Sanders brought in about $1,042,000, mostly thanks to a hefty book advance for his newest tome, 'Our Revolution: A Future to Believe In.'

Following in the footsteps of wealthy Republicans, the 2016 purchase of Sanders' third home – a lake front four-bedroom located in the Champlain Islands, that cost the senator $575,000 in August 2016 – is hidden behind a family trust.

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Sen. Bernie Sanders, a former Democratic presidential candidate, is a millionaire as of 2016, according to his latest Senate financial filings

On the Senate filing he writes, 'I am a co-trustee in a family trust created when we bought a summer home.'

Beyond Sanders' newest book – which earned the democratic-socialist $795,000 – he also brought in $63,750 for another book he's co-writing, 'Bernie Sanders' Guide to Political Revolution,' $6,735 in royalties for his 1997 book, 'Outside in the House,' and another $2,521 in royalties for sales of his 1987 folk and spoken-word album, 'We Shall Overcome.'

That comes to just over $868,000.

The least amount Sanders can make as a U.S. senator is $174,000, bringing his baseline total for the year to about $1,042,000.

Seven Days rounded up Sanders' earnings, by including his pension and Jane Sanders' retirement fund, which was listed under income, among other things.

Sen. Bernie Sanders third home is on North Hero Island (pictured), where he purchased the lake front home in 2016 for $575,000

The senator listed his wife's batch of retirement mutual funds as part of his Senate disclosure too, though thanks to Senate rules, only lists them in broad amounts.

That means they could be worth anywhere from $192,000 to $815,000.

The former Democratic presidential candidate also lists the basic amount of his two mortgages for his other two homes.

One is worth between $250,001 and $500,000, while another is valued between $100,001 and $250,000.

Of course, in comparison to some of Sanders' Senate peers, the Vermont independent looks 'dead broke,' as his rival Hillary Clinton once said of her post-White House financial position.

In November 2015, Roll Call put out its latest wealth index and found the richest member of the Senate to be Virginia Democrat Mark Warner, valued at $90.85 million.

That year, Sanders was ranked No. 81 in a body of 100, though this year he'll likely be higher up the chart.

President Donald Trump, worth in the billions, is currently the richest U.S. politician.