Former President Donald J. Trump and the Republican Party out-raised President Biden and the Democrats last month for the first time in this election cycle, according to campaign officials, as Mr. Biden’s pace of fund-raising slowed significantly from March.

Mr. Trump’s advisers have said privately that his campaign, together with the Republican Party and all of their affiliated committees, raised $76.2 million in April. The Biden campaign said on Monday evening that it had raised $51 million in April with the Democratic National Committee — which was just over half as much as they raised in March, and also a touch less than they raised in February.

In filings with the Federal Election Commission on Monday, Mr. Biden’s campaign committee reported taking in $24.2 million in April, compared with $43.8 million in March.

Mr. Trump’s campaign still lags far behind in total cash on hand, the April filings show. Mr. Biden’s campaign ended April with $84.5 million on hand, holding roughly steady from the preceding month, while Mr. Trump’s campaign had $48 million in net cash on hand, up from $45 million in March.

Mr. Trump had been widely expected to close the fund-raising gap with Mr. Biden once he secured the Republican nomination, because he can now raise money in tandem with the Republican National Committee, collecting checks of more than $800,000 per donor. Mr. Biden has been gathering such large checks for months with his party, building an overall war chest with the Democratic National Committee and their shared accounts of $192 million.