The 28-day cycle is the most common billing pattern for established portable sanitation operators. It runs 28 days from an anchor date you set on the customer profile, with no calendar-month alignment. Because there are 13 full 28-day periods in a year (versus 12 calendar months), a customer on a 28-day cycle generates one extra billing period per year compared to monthly billing at the same rate.
To set up a customer on a 28-day cycle, edit their profile, find the Billing section, and choose Billing Cycle = "Fixed-day cycle." Set Days per cycle to 28 and First cycle started on to the start date of their very first cycle with you. The system uses this anchor date to calculate every subsequent cycle window. If the customer started Jan 1 2026, cycle 1 is Jan 1 – Jan 28, cycle 2 is Jan 29 – Feb 25, cycle 3 is Feb 26 – Mar 25, and so on through 13 cycles in the calendar year.
The cycle drifts through the calendar — it doesn't anchor to month boundaries. That's by design. Cycle 7 might cross a month boundary or even a year boundary. The service period on each Cycle Invoice always shows the exact 28-day window so the customer knows what they're being billed for.
You can pair the customer's 28-day cycle with any rate period on individual Rate Card rows. Most operators set both to per-28-day so the math is clean: 4 units × $85 per 28-day cycle = $340 per cycle, billed 13 times a year. If the location rate period and the customer cycle don't match (28-day customer with a per-month location, for example), the system normalizes the rate to keep the charge accurate for the cycle window.
Cycle invoices for 28-day customers run on the cycle close date. If you want a delay before invoicing (e.g., 3 days after close to allow for last-minute service edits), set Billing day offset in the customer's Billing section.