Budgeting for irregular income

Irregular incomeWhen I posted about the 28-day budget, I received a comment on G+ about irregular income. A lot of people believe they can’t do a budget if their income fluctuates. Don’t get my wrong, it is much easier to budget when your income is the same every month, but for most people that is not the case. Even for us, our income changes every month because of my tax business. We each have a base salary, plus my irregular business income. So how do you budget for this?