Washington (CNN) - Former Massachusetts Gov. Mitt Romney will report having raised between $11 and $13 million over the last three months, according to a source familiar with the tally.
Friday is the deadline for the third fundraising quarter of 2011, but campaigns are not required to report their totals until Oct. 15.
That total is less than the $18.2 million that Romney collected during previous fundraising quarter.
Romney spokeswoman Gail Gitcho would not confirm the fundraising total but said a downturn in fundraising is normal during the course of a campaign.
The vacation month of August is also traditionally a slower fundraising period.
"The first reporting period is usually the best finance report for a campaign," Gitcho said in an email. "We are going to raise considerably less than what we did in our first reporting period, but we will still meet our finance goals for this quarter. Unlike other candidates, all of the dollars we raise will be for the primary."
The Boston Globe was first to report the Romney haul.
The quarterly fundraising totals will be watched for signs of each campaign's financial strength, but no report will be as closely scrutinized as Texas Gov. Rick Perry's.
Perry entered the race in August and quickly shot to the top of national polls, but few outside of his inner circle know just how much money he has in the bank.
Perry is one of the most prolific GOP fundraisers in the country, but federal finance laws are stricter than those in Texas.
The Romney campaign sought to raise expectations for Perry.
"Rick Perry is a brand new candidate raising primary and general election dollars, and as the governor of a large state and former RGA chair we suspect he will lead the Republican field in fundraising for this quarter," Gitcho said.