> ## Documentation Index
> Fetch the complete documentation index at: https://commet.co/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Billing Intervals

> How weekly, monthly, quarterly, semiannual, and yearly billing works and when your customers get charged

Plans can be billed weekly, monthly, quarterly, semiannually (every 6 months), or yearly. Even on quarterly, semiannual, and yearly plans, Commet checks for usage charges **every month**. Here's what your customers can expect.

## Weekly Plans

Your customer is billed every 7 days. The billing period, consumption resets, and invoicing all happen on a weekly cycle.

* Plan base charged every week
* Usage (credits, balance, metered) resets every week
* Extra seats charged every week
* The billing day anchors to the day of the week the subscription started (e.g., every Monday)

> [!NOTE]
>
> Weekly plans reset consumption **every 7 days**, not monthly. A customer on a weekly plan with 1,000 included API calls gets 1,000 calls each week.

## Monthly Plans

Straightforward: your customer is billed every month for their plan base, extra usage, and extra seats.

## Quarterly, Semiannual, and Yearly Plans

Your customer pays the plan base every 3, 6, or 12 months, but **usage charges can happen every month**. Here's how it works:

### Example: Quarterly plan at \$300/quarter

```
Month 1:
  → Your customer used extra API calls? They get a small invoice for just the overage.
  → No extra usage? No invoice at all.

Month 2:
  → Same thing — only charged if they had extra usage.

Month 3 (renewal month):
  → Full invoice: plan base ($300) + any extra usage + any extra seats.
  → Billing cycle resets for the next quarter.
```

> [!WARNING]
>
> Usage resets **every month**, not every quarter, half-year, or year. A customer on a quarterly plan with 10,000 included API calls gets 10,000 calls each month — they don't accumulate.

## What Your Customer Sees

| | Months between renewals | Renewal month |
| - | - | - |
| Plan base | Not charged | Charged |
| Extra usage | Charged (if any) | Charged |
| Extra seats | Not charged | Charged |
| No extra usage at all | No invoice | Invoice (has plan base) |

## Plan Changes Mid-Cycle

If your customer upgrades a quarterly, semiannual, or yearly plan mid-cycle, they get credit for the unused portion and start a new cycle from the change date. See [Proration](https://commet.co/docs/how-is-proration-calculated-when-changing-plans.md) for the exact calculation.

### Example

```
Your customer is on Plan A at $300/quarter (January 1 – April 1).
They upgrade to Plan B at $600/quarter on February 15.

→ They get credit for the unused portion of Plan A.
→ They're charged Plan B's full price minus that credit.
→ Their new cycle starts February 15, next renewal May 15.
```


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