Abstract background representing CalmerSys bookkeeping and business systems

About CalmerSys

Why CalmerSys Exists

CalmerSys was created to take bookkeeping off your hands, so you can focus on running your business.

When your books are kept up to date, everything else runs smoother and you’re not dealing with problems later.

About me

CalmerSys is run by Mike Percsy.

I’ve spent 25+ years designing tax, accounting, and financial systems, along with 15 years running small businesses myself.

So I’ve seen both sides:

  • how things should be structured.
  • and what it’s like trying to stay on top of everything day to day.

How it works

If things are behind, they get brought up to date properly first.

From there, everything is kept consistent — so nothing builds up and nothing gets missed.

  • Everything is organised properly in Xero
  • Ongoing work is handled regularly each month
  • You always know where things stand

You deal directly with me the whole time, so nothing gets lost along the way.