AFH is initially paying £333,000 in cash, with the remaining to be payable in cash over the next 26 months in two payments, dependent on the performance of Monopoly.
Under the terms of the acquisition, the firm said it expected the deal to contribute approximately £170,000 of recurring revenue to the company.
The deal, which completed on 5 January 2018, will see Monopoly director Nigel Parbrook join AFH as an adviser.
Alan Hudson, chief executive of AFH, said: “This is our third purchase of an IFA business for the current financial year, reflecting our strong pipeline of acquisition targets.
“This latest acquisition further increases our capacity in the South East of England and I look forward to working with Nigel for the benefit of our new clients and to increase shareholder value.”
This is the firm’s first acquisition of 2018, following its takeover of JW Wealthcare in December and Colchester-based adviser Britton Financial in November.