Ms Simpson, whose Faith Simpson Accountants has been shortlisted for the Association of Scottish Businesswomen's Business of the Year award, plans to divideher time between her firm's Elgin office and Fife as she aims to continue the rapid expansion of her venture.
She also highlighted medium-term ambitions to expand into the west of Scotland.
Ms Simpson revealed her firm was enjoying year-on-year growth of about 25%, and had a six-figure turnover. Faith Simpson Accountants does work for individuals and small and medium-sized businesses.
Commenting on the clients for which her firm does work, Ms Simpson said: "It is very, very broad. We go from your individual, just doing tax, to companies turning over a fair few million pounds. We sometimes do just year-end work, but for a lot of our clients we provide a complete service."
Ms Simpson established her accountancy firm in 2006 as a sole trader, in her office in Elgin. Faith Simpson Accountants employs five staff, in addition to its founder.
She expects to hire a further two staff over the next two months.
And she plans to recruit an operations director within the next 12 months.
Ms Simpson said: "I am looking at taking on an operations director to look after the day-to-day running of the business, so I am more strategic."
She highlighted the fact that she already had clients in Edinburgh.
And she flagged ambitions to open a hub outside Glasgow, to target the west of Scotland marketplace, in about three years' time.
She said: "I would like to expand to the west coast but I wouldn't base myself in Glasgow."
The Association of Scottish Businesswomen's awards will be held at the Ardoe House Hotel in Aberdeen on August 30.
Ms Simpson is the Highland Business Women's Club Business Woman of the Year, in the self-employed category,
She was a runner-up in the Scottish Female Entrepreneur of the Year category at this year's Scottish Business Awards, at which former US President Bill Clinton was the keynote speaker.
Until November 2012, she was the Moray Business Woman of the Year.
Before setting up on her own, Ms Simpson worked for accountancy firm Johnston Carmichael. Prior to that, she worked in Guernsey for accountancy firm Deloitte & Touche and Specsavers.