# Adds discount eligibility options for add-on invoice items on Subscriptions and Preview Invoice APIs ## What’s new Adds an optional [discountable](https://docs.stripe.com/api/subscriptions/create.md?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items-discountable) parameter when creating add-on invoice items using `add_invoice_items` on the [Subscriptions](https://docs.stripe.com/api/subscriptions.md?api-version=2026-05-27.dahlia), [Subscription Schedules](https://docs.stripe.com/api/subscription_schedules.md?api-version=2026-05-27.dahlia) and [Preview Invoice](https://docs.stripe.com/api/invoices/create_preview.md?api-version=2026-05-27.dahlia) APIs. The discountable parameter controls whether an invoice item is eligible for discounts. Discounts are only applied to discountable invoice items. The discountable value is also returned as a new property in the [phases.add_invoice_items](https://docs.stripe.com/api/subscription_schedules/object.md?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items) array on the [Subscription Schedule](https://docs.stripe.com/api/subscription_schedules/object.md?api-version=2026-05-27.dahlia) object. ## Impact With the new `discountable` parameter, you can explicitly set whether each add-on invoice item is eligible for discounts. This feature gives you more precise control over how discounts interact with one-time charges and credits on your subscriptions. If you don’t provide a value, invoice items default to being discountable. This change doesn’t modify the behavior of existing integrations, and you must explicitly state in the request when an add-on invoice item must be non-discountable. ## Changes #### REST API | Parameter | Change | Resources or endpoints | | --- | --- | --- | | `discountable` | Added | [Invoice#create_preview.schedule_details.phases[].add_invoice_items[]](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [Subscription#create.add_invoice_items[]](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [Subscription#update.add_invoice_items[]](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items), [SubscriptionSchedule#create.phases[].add_invoice_items[]](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionSchedule#update.phases[].add_invoice_items[]](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items), [SubscriptionSchedule.phases[].add_invoice_items[]](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items) | #### Ruby | Parameter | Change | Resources or methods | | --- | --- | --- | | `discountable` | Added | [InvoiceCreatePreviewParams::ScheduleDetail::Phase::AddInvoiceItem](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionCreateParams::AddInvoiceItem](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [SubscriptionSchedule::Phase::AddInvoiceItem](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionScheduleCreateParams::Phase::AddInvoiceItem](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionScheduleUpdateParams::Phase::AddInvoiceItem](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items), [SubscriptionUpdateParams::AddInvoiceItem](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items) | #### Python | Parameter | Change | Resources or methods | | --- | --- | --- | | `discountable` | Added | [InvoiceCreatePreviewParamsScheduleDetailPhaseAddInvoiceItem](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionCreateParamsAddInvoiceItem](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [SubscriptionModifyParamsAddInvoiceItem](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items), [SubscriptionSchedule.Phase.AddInvoiceItem](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionScheduleCreateParamsPhaseAddInvoiceItem](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionScheduleModifyParamsPhaseAddInvoiceItem](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items) | #### PHP | Parameter | Change | Resources or methods | | --- | --- | --- | | `discountable` | Added | [Invoice.create_preview().$params.schedule_detail.phase.add_invoice_item](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [Subscription.create().$params.add_invoice_item](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [Subscription.update().$params.add_invoice_item](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items), [SubscriptionSchedule.create().$params.phase.add_invoice_item](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionSchedule.phases[].add_invoice_items[]](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionSchedule.update().$params.phase.add_invoice_item](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items) | #### Java | Parameter | Change | Resources or methods | | --- | --- | --- | | `discountable` | Added | [InvoiceCreatePreviewParams.schedule_details.phases[].add_invoice_items[]](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionCreateParams.add_invoice_items[]](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [SubscriptionSchedule.phases[].add_invoice_items[]](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionScheduleCreateParams.phases[].add_invoice_items[]](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionScheduleUpdateParams.phases[].add_invoice_items[]](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items), [SubscriptionUpdateParams.add_invoice_items[]](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items) | #### Node.js | Parameter | Change | Resources or methods | | --- | --- | --- | | `discountable` | Added | [InvoiceCreatePreviewParams.schedule_details.phases[].add_invoice_items[]](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionCreateParams.add_invoice_items[]](/api/subscriptions/create?api-version=2026-05-27.dahlia#create_subscription-add_invoice_items), [SubscriptionSchedule.phases[].add_invoice_items[]](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionScheduleCreateParams.phases[].add_invoice_items[]](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items), [SubscriptionScheduleUpdateParams.phases[].add_invoice_items[]](/api/subscription_schedules/update?api-version=2026-05-27.dahlia#update_subscription_schedule-phases-add_invoice_items), [SubscriptionUpdateParams.add_invoice_items[]](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items) | #### Go | Parameter | Change | Resources or methods | | --- | --- | --- | | `Discountable` | Added | [InvoiceCreatePreviewScheduleDetailsPhaseAddInvoiceItemParams](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionAddInvoiceItemParams](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items), [SubscriptionSchedulePhaseAddInvoiceItem](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionSchedulePhaseAddInvoiceItemParams](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items) | #### .NET | Parameter | Change | Resources or methods | | --- | --- | --- | | `Discountable` | Added | [InvoiceScheduleDetailsPhaseAddInvoiceItemOptions](/api/invoices/create_preview?api-version=2026-05-27.dahlia#create_invoice-schedule_details-phases-add_invoice_items), [SubscriptionAddInvoiceItemOptions](/api/subscriptions/update?api-version=2026-05-27.dahlia#update_subscription-add_invoice_items), [SubscriptionSchedule.Phase.AddInvoiceItem](/api/subscription_schedules/object?api-version=2026-05-27.dahlia#subscription_schedule_object-phases-add_invoice_items), [SubscriptionSchedulePhaseAddInvoiceItemOptions](/api/subscription_schedules/create?api-version=2026-05-27.dahlia#create_subscription_schedule-phases-add_invoice_items) | ## Upgrade #### REST API 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. If you use an SDK, upgrade to the corresponding SDK version for this API version. - If you don’t use an SDK, update your [API requests](https://docs.stripe.com/api/versioning.md) to include `Stripe-Version: 2026-05-27.dahlia` 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### Ruby 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your Ruby SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### Python 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your Python SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### PHP 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your PHP SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### Java 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your Java SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### Node.js 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your Node SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### Go 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your Go SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). #### .NET 1. [View your current API version](https://docs.stripe.com/upgrades.md#view-your-api-version-and-the-latest-available-upgrade-in-workbench) in Workbench. 2. Upgrade your .NET SDK to the latest version. 3. Upgrade the API version used for [webhook endpoints](https://docs.stripe.com/webhooks/versioning.md). 4. [Test your integration](https://docs.stripe.com/testing.md) against the new version. 5. If you use Connect, [test your Connect integration](https://docs.stripe.com/connect/testing.md). 6. In Workbench, [perform the upgrade](https://docs.stripe.com/upgrades.md#perform-the-upgrade). You can [roll back the version](https://docs.stripe.com/upgrades.md#roll-back-your-api-version) for 72 hours. Learn more about [Stripe API upgrades](https://docs.stripe.com/upgrades.md). ## Related changes - [Adds amount paid off Stripe property to Invoice object](https://docs.stripe.com/changelog/dahlia/2026-05-27/invoice-object-amount-paid-off-stripe-property.md) - [Adds billing schedules to enable prebilling on subscriptions](https://docs.stripe.com/changelog/dahlia/2026-05-27/subscriptions-billing-schedules.md) - [Adds discount and discounts properties to pending subscription updates](https://docs.stripe.com/changelog/dahlia/2026-05-27/pending-subscription-updates-discount-and-discounts-properties.md) - [Adds metadata support to pending subscription updates](https://docs.stripe.com/changelog/dahlia/2026-05-27/pending-subscription-update-metadata.md) - [Adds credited items information to invoice item proration details](https://docs.stripe.com/changelog/dahlia/2026-05-27/invoice-item-proration-credited-items.md) - [Adds customer parameter to test clock creation](https://docs.stripe.com/changelog/dahlia/2026-05-27/test-clock-creation-customer-parameter.md)