Marco Rubio and Ted Cruz on Saturday released summaries of the of their tax returns, in an effort to shame front-runner Donald Trump into releasing more of his financial documents.
Rubio released summaries of five tax years Saturday and Cruz later released summaries of four years, from 2011 to 2014.
From 2010-2014, Rubio's salary was less than $200,000 a year but he also profited from two book deals, the tax filings show.
During that period, Rubio's income has fluctuated between $276,059 and $938,963 a year. The average was $461,242 a year.
Rubio has paid between $46,500 and $254,894 a year in federal income tax.
In 2010, Rubio's tax rate was 9.4 percent. In 2012 — his most lucrative year — it was 27.4 percent.
The documents released Saturday are not complete tax filings, only summaries. They do not include his Schedule E form, which details rental and corporate income.
Also missing from Rubio's Saturday release: his Schedule D form on capital gains, which would detail investment income.
Cruz released tax summaries from 2011 through 2014 tax years.
The Cruz household had an adjusted gross income of between $970,193 in 2013 and $1.731 million in 2011, according to the joint tax filings from Cruz and his wife, Heidi. He paid an effective tax rate of between 28.38 percent and 32.22 percent. Cruz had a household income of $1.2 million in 2014.
Rubio has repeatedly hammered Trump over not releasing similar information. Former Massachusetts governor and presidential candidate Mitt Romney speculated the documents might contain a "bombshell."
Trump said Thursday that he hadn't released his tax filings because he was being audited, and said he would release his tax forms when they are completed.
Cruz in a statement Saturday dismissed that claim as "nonsense" and called on Trump to release the tax information. Cruz suggested Trump was balking because the documents might show donations to Democrats or groups unpopular with conservatives.
"It is time to stop the excuses," Cruz said in the statement.
Cruz and Rubio have stepped up attacks against Trump in an attempt to stop the front-runner's momentum ahead of the "Super Tuesday" primaries. Trump won last Saturday's the Nevada caucuses by a decisive margin, marking his third victory in a row.
This story originally appeared on NBCNews.com.