A tremendous number of people are able to earn sizable supplemental income by having a moonlighting computer consulting business. But even more importantly, by moonlighting, you can figure out if you enjoy computer consulting before you take the plunge into building a full-time computer consulting business.

Learn True Billable Hours

Moonlighting as a computer consultant will also give you an appreciation of true billable hours. What does this mean? For example, let's say you spend 10 hours working, but you may only be able to bill for 4. Or you spend 10 hours and can only bill 6 or 7 of these 10 hours. That's the reality. You can read about it until the cows come home. But unless you experience it firsthand, you will not get the full picture.

What Constitutes Non-Billable Hours?

What takes up those non-billable hours? The other responsibilities of running a business. These include: