Hi @Artem_Fokin,
Since you’re wanting all of the yearly billing cycles to start from January 2026, but want to bill the customers with customized dates within the cycle, I would recommend creating the Subscription Contracts with the Anchor Date set to the first of January, then editing the individual billing cycles after the fact to change the billing date of each individual cycle with the subscriptionBillingCycleScheduleEdit mutation.
Here’s an example subscriptionContractAtomicCreate mutation setting the Anchor date to January 1st. This will create a Subscription Contract with cycles going from January 1st to December 31st, with the first cycle being billed on December 31st 2026, the end of the billing cycle.
mutation {
subscriptionContractAtomicCreate(input: {
customerId: "gid://shopify/Customer/123",
nextBillingDate: "2026-01-01", # Just metadata for your tracking
currencyCode: USD,
contract: {
status: ACTIVE,
billingPolicy: {
interval: YEAR,
intervalCount: 1,
anchors: [{
type: YEARDAY,
day: 1,
month: 1
}]
},
deliveryPolicy: {
interval: YEAR,
intervalCount: 1,
anchors: [{
type: YEARDAY,
day: 1,
month: 1
}]
}
# ... rest of contract
}
}) {
contract { id }
}
}
If you want to edit the billing date of a specific cycle, for example if the first cycle you want to bill the customer on February 1st instead, you can do so with the subscriptionBillingCycleScheduleEdit mutation, here’s an example editing the billing date of the first cycle for a customer that paid 11 months ago to February 1st 2026:
mutation {
subscriptionBillingCycleScheduleEdit(
billingCycleInput: {
contractId: "gid://shopify/SubscriptionContract/123",
selector: { index: 1 } # First cycle (Jan 2026 - Jan 2027)
},
input: {
billingDate: "2026-02-01", # Bill in Feb 2025
reason: DEV_INITIATED
}
) {
billingCycle {
cycleIndex
cycleStartAt # Should be ~Jan 1st 2026
cycleEndAt # Should be ~Dec 31st 2026
billingAttemptExpectedDate # Should be Feb 1st 2026
}
}
}
This does only edit the billing date for the individual cycle, and all future cycles will default back to the end of the billing cycle, December 31st. If you’d rather have the individual customers maintain their own individual billing dates permanently, you should instead create the contracts with the anchors set to the correct billing date to begin with, rather than setting the anchor to January 1st.
Here’s some Shopify.dev documentation with more information on managing Billing Cycles and Selling Plan Anchor dates: