Republican presidential candidate Donald Trump waves as he leaves the residence of Indiana Gov. Mike Pence in Indianapolis, Wednesday, July 13, 2016. Michael Conroy AP
">

Tax experts and government watchdog groups say without the full returns, voters can’t see such items as sources of income, which tax breaks were claimed or what candidates might have deducted as business expenses or how much they gave to charity.

There is no requirement that candidates show their tax returns, but it has become common practice for White House seekers since Jimmy Carter became president in 1976.

The returns provide voters a look into the personal finances and charitable contributions of candidates and gives insight into whether he or she has any potential conflicts of interest.