Former National Business Review owner Barry Colman recently gave over $50,000 to the National Party in what is the wealthy publisher's first contribution to the party that's required to be disclosed.
Mr Colman paid $50,000 to the party earlier this month, on top of previous donations of $600 and $1520 in recent months according to recent filings of party donations over $30,000 on the Electoral Commission's website.
Mr Colman's previous donations to National were revealed in journalist Nicky Hager's book the Hollow Men but were done in a way that didn't require disclosure at the time.
The website also shows Conservative Party Leader Colin Craig sank a further $100,000 into his party earlier this month taking his total donations since the last election to $876,000.
He has said he intends funding the bulk of his party's projected $1.5 million campaign costs.
A donation of just under $1.7 million shortly after the last election was the write-off of loans he made to the party during its 2011 election campaign.