FastDue, which offers a range of online office tools and forms for small businesses and freelancers, has raised a $5 million a first round of financing.

The company’s services include invoicing, past due collection, expense reports, and legal and business form agreements. As the name implies, FastDue is focused on managing the relationships between businesses and customers, and specifically on payments, but it has a big vision — to provide any service that a business needs online. Features planned for the future include an iPhone application, board meeting manager, and account payment tracker.

To a certain extent, FastDue sounds like a cross between bookeeping products like Outright or Intuit’s online QuickBooks and web billing platforms like Zuora. The Fairfield, Iowa company is probably particularly tempting to some customers because it’s free and ad-supported.

The round comes from an undisclosed angel investor — that’s right, FastDue raised $5 million from a single angel. The company is also planning to raise a second round in the next quarter.