How much do you charge per month? I charge $500 bi-weekly (or $1,000 every 4 weeks). That is $12,250/year for 49 weeks that I am open and paid for (my 3 weeks unpaid vacation). If I charged $1,000 per month it would be $11,250 ($1,000/month by 12 months minus 15 days vacation at $50/day).

Also $500 bi-weekly sounds easier to put together than $1,000 per month.