Migration route

    UKG→Workday

    UKG to Workday Data Migration

    Migrate workers, job data, payroll from UKG (Ultimate Kronos Group) to Workday HCM using a controlled process for extraction, mapping, transformation, validation, loading and reconciliation.

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    Migration overview

    UKG to Workday is one of the most common HCM replacements, and the one where scope is most often underestimated — because total worker records typically exceed active headcount by a wide margin once terminated and rehired populations are counted.

    The first decision is which UKG product is in scope. UKG Pro, UKG Ready and Workforce Central are different systems with different data models, and treating them as one platform produces an extraction design that fits none of them.

    Typical data scope

    Scope is agreed in discovery. On this route it usually covers:

    Workers

    Domain in scope for a typical UKG to Workday programme.

    Job data

    Domain in scope for a typical UKG to Workday programme.

    Payroll

    Domain in scope for a typical UKG to Workday programme.

    Time and attendance

    Domain in scope for a typical UKG to Workday programme.

    Historical records

    Domain in scope for a typical UKG to Workday programme.

    Migration architecture

    One controlled pipeline, run as repeatable cycles.

    UKG→DataMove→Transformation & validation→Workday→DataVault reconciliation→DataLens

    Extracting from UKG

    What the source platform makes available, and the constraints that shape the extraction design.

    Product line decides everythingUKG Pro, UKG Ready and UKG Workforce Central (the former Kronos) are different products with different data models and different extraction surfaces. Establishing which one is in scope is the first job, not a detail.
    Configuration is the key to the dataTimekeeping data is meaningless without its pay rules, pay codes and work rules. A punch without its rule set cannot be interpreted later, so configuration is extracted alongside the transactions.
    Reporting and API surfaceExtraction runs through the product's reporting layer and available APIs rather than direct database access on the cloud products.
    Worker records vs active workersTotal worker records typically exceed active headcount by a wide margin once terminated and rehired populations are included, which changes both scope and licence reconciliation in the target.

    Source-to-target mapping

    A mapping workbook carries every field in scope from its UKG source through its transformation rule to the Workday target object and field. It is reviewed and approved with the business before the production migration, and applied identically in every cycle so a decision made once is not re-made under cutover pressure.

    Transformation challenges on this route

    The differences between UKG and Workday that create most of the work.

    Timekeeping data needs its configuration

    A punch means nothing without its pay code, work rule and pay period. Configuration and reference data are migrated or archived alongside the transactions, or the history becomes uninterpretable.

    Workday loads are business processes

    A Hire in Workday is an event with steps, conditions and approvals — not an insert. A load that ignores the business process configuration either fails or leaves events sitting in flight.

    Supervisory organisations before workers

    Workday will not stage a worker into an organisation that does not exist, so the organisational model is built and loaded first.

    Active versus total population

    Which population moves and which is archived drives both migration effort and Workday licence reconciliation, and is agreed before the first cycle.

    History rarely belongs in the tenant

    Detailed timecard and pay history is usually archived rather than migrated, with only the balances and records the new system needs carried across.

    How Workday accepts the data

    Load order is part of the design, not an implementation detail.

    1. 1Foundation before workersSupervisory organisations, locations, job profiles, cost centres and compensation structures. Workday will not stage a worker into an organisation that does not exist.
    2. 2Choose EIB or Core Connector per objectEnterprise Interface Builder handles spreadsheet-shaped bulk loads against a web service; Core Connectors and Workday Studio cover the higher-volume and more complex integrations. Object volume and complexity decide which.
    3. 3Loads run as business processesThis is the difference that surprises teams coming from ERP. A Hire in Workday is a business process, not an insert. It has steps, conditions and approvals, and a load that ignores the process configuration either fails or leaves events sitting in flight.
    4. 4Staged hires and effective datingWorkers are commonly staged with a hire event and effective dates that reconstruct history, which means the load order follows the timeline as well as the dependency graph.
    5. 5Positions and supervisory hierarchyPosition management, where used, requires positions before workers; supervisory organisation assignment then rebuilds the reporting structure.
    6. 6Compensation after employmentCompensation plans and grades resolve against structures loaded earlier, so compensation is a later pass rather than a column on the worker load.
    7. 7Work the EIB error outputEach load returns per-row results. Failures are categorised against the business process or the validation that rejected them, corrected and reloaded.

    Treating a Workday load like an ERP insert is the single most common cause of a failed first cycle. Events, effective dating and the business process framework decide what a load actually does.

    Validation and reconciliation

    Validation before load

    Mandatory fields, referential integrity, format checks, business-rule validation and duplicate detection run on the prepared data, so problems surface as reportable exceptions rather than as failed loads in Workday.

    Reconciliation after load

    Source counts, transformed counts, rejected records and target counts, with control totals where the data supports them. Every discrepancy is categorised so the migration is approved on evidence rather than assertion.

    Migration cycles

    The pipeline is run end to end more than once before anything touches production. A typical structure is a first rehearsal that surfaces the bulk of mapping and data-quality corrections, a second that applies them and demonstrates production readiness, and the production cutover itself. How many cycles a programme needs depends on data quality and scope, which is established during discovery.

    1. 1Mock / PPR 1First full extract, transform, load, reconcile and exception analysis. Expect the largest correction list here.
    2. 2Mock / PPR 2Corrections applied, re-extract, re-run. Intended to closely replicate the production migration.
    3. 3Production cutoverFinal extract, data freeze, load, reconciliation, business validation and sign-off.

    Common risks on this route

    UKG product not pinned down early

    Pro, Ready and Workforce Central differ enough that a design for one does not transfer.

    Accrual balances mis-stated at cutover

    Leave and accrual balances are visible to every employee on day one, so they are reconciled explicitly rather than sampled.

    Effective dating flattened

    Loading current state only discards the history the business assumed was coming with it.

    How Syntra ETL supports this route

    DataMove

    Extraction, mapping, transformation and load preparation for Workday.

    Explore DataMove →

    DataVault

    Source-to-target reconciliation, migration lineage and audit evidence for every cycle.

    Explore DataVault →

    DataLens

    Migration status, data quality and exception visibility across cycles.

    Explore DataLens →

    Proven experience on this migration

    UKG→WorkdayMigration complete

    UKG Ready to Workday for a national US contract-security provider

    A published case study covering this exact source-to-target route.

    View Case Study

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