# Migrate a line-of-credit portfolio

Migrate an existing line of credit (LOC) portfolio from your legacy system to Peach: prepare your data, create borrowers and loans, populate historical records, execute the migration, and validate the results. This section is for integration engineers running a migration, with concept and reference pages for analysts and operations.

LOC migration uses a statement-based approach. Historical data before the most recent statement date is stored as read-only snapshots; data after that date is replayed by Peach's Loan Replay™ engine.

## In this section

- **[LOC migration key concepts](/loan-lifecycle/loc-migration/key-concepts)** — The cutoff date, migration draw, past periods, and historical vs. live activity.
- **[Before you migrate a LOC portfolio](/loan-lifecycle/loc-migration/before-you-migrate)** — Prerequisites and timing for the migration window.
- **[LOC migration procedure](/loan-lifecycle/loc-migration/migration-procedure)** — Create the borrower and loan, populate history, create activities, and execute.
- **[After LOC migration](/loan-lifecycle/loc-migration/after-migration)** — Validate balances, configure autopay and credit reporting, and post-migration behavior.
- **[Modify data after LOC migration](/loan-lifecycle/loc-migration/modifying-data-after-migration)** — Dispute purchases, cancel fees, and change or reverse past transactions.
- **[LOC migration special cases and configuration](/loan-lifecycle/loc-migration/special-cases-and-configuration)** — Origination and draw fees, statement scheduling, and special loan states.
- **[LOC migration strategy and operations](/loan-lifecycle/loc-migration/strategy-and-operations)** — Batching, borrower communications, concurrent operation, and re-migration.
- **[LOC migration validation and troubleshooting](/loan-lifecycle/loc-migration/validation-and-troubleshooting)** — Validation rules and a troubleshooting FAQ.
- **[LOC migration API and webhooks reference](/loan-lifecycle/loc-migration/api-and-webhooks-reference)** — Endpoints used across the workflow and webhook events.
- **[How LOC billing cycles work](/loan-lifecycle/loc-migration/how-loc-billing-cycles-work)** — Period dates and non-due to due to overdue balance movement.
- **[How grace periods work for lines of credit](/loan-lifecycle/loc-migration/how-grace-periods-work)** — The pay-in-full rule, daily grace tracking, and the due-date-plus-one check.
- **[How LOC draws work](/loan-lifecycle/loc-migration/how-loc-draws-work)** — Draw types, the shared credit limit, and the static migration draw.