> For the complete documentation index, see [llms.txt](https://dev.ropo.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.ropo.com/guides/basics/invoice/payment-plans.md).

# Payment plans

Payment plans split the invoice into instalments. The service can either calculate instalments or you can provide them.

### Calculated payment plan

Use these fields on invoice `dataset`:

* `payplaninterval`. Months between instalments.
* `payplanamount`. Instalment amount in EUR.
* `payplancount`. Number of instalments.

Send `payplaninterval` and one of `payplanamount` or `payplancount`.

#### Example: 100 EUR per month

```json
{
  "datastream": {
    "dataset": [
      {
        "jobtype": "0",
        "customertype": "1",
        "company": "Example Company",
        "address": "Example street 1",
        "postcode": "00100",
        "city": "Helsinki",
        "billdate": "2026-02-06",
        "paydate": "2026-02-20",
        "payplaninterval": "1",
        "payplanamount": "100.00",
        "payrow": [
          { "desc": "Installment sale", "count": "1", "amount": "499.99", "taxpr": "24" }
        ]
      }
    ]
  }
}
```

### Self-calculated payment plan

Use `payplan.instalment` to set your own amounts and dates.

```json
{
  "datastream": {
    "dataset": [
      {
        "jobtype": "0",
        "customertype": "1",
        "company": "Example Company",
        "address": "Example street 1",
        "postcode": "00100",
        "city": "Helsinki",
        "billdate": "2026-02-06",
        "paydate": "2026-02-20",
        "payplan": {
          "instalment": [
            { "date": "2026-02-20", "amount": "250.00" },
            { "date": "2026-08-20", "amount": "249.99" }
          ]
        },
        "payrow": [
          { "desc": "Installment sale", "count": "1", "amount": "499.99", "taxpr": "24" }
        ]
      }
    ]
  }
}
```

{% hint style="warning" %}
Payment plans cannot be used for consumer e-invoices or consumer invoices. If you need instalments for consumers, send separate invoices per due item.
{% endhint %}


---

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