Hillary Clinton will release her 2015 tax returns this week in order to highlight her Republican opponent Donald Trump’s refusal to make his own returns public, CNBC reported Thursday.

The returns will show that Clinton’s effective tax rate is around 35 percent and her charitable donations make up 10 percent, according to the network.

The Democratic nominee released her 2007-2014 returns earlier in the race and made them public on her campaign website. Her running mate, Sen. Tim Kaine (D-VA), is also expected to release ten years of his tax returns this week.

In a break with 40 years of precedent for presidential nominees, Trump has repeatedly refused to release his own tax records. He attributed his refusal to an ongoing audit by the IRS, though the agency said that an audit would not prevent Trump from making his returns public.

Newsweek this week reported that Trump has yet to definitively prove that the IRS is auditing Trump’s taxes, and did not respond to the news site’s request for the standard audit letter the agency sends to subjects of investigations.