How OneStream Improves Rolling Forecast and Financial Forecasting

Rolling Forecast requires regular data updates and close collaboration across finance teams. As organizations grow, the forecasting process becomes increasingly complex.

Common challenges include:

• multiple parallel versions of Excel files,
• manually copying data between budgets and forecasts,
• limited visibility into who made changes and when,
• lengthy data reconciliation across legal entities,
• difficulty creating and comparing alternative planning scenarios.

As a result, finance teams spend a significant amount of time managing the forecasting process instead of analyzing data and supporting better business decisions.

Preparing a new forecast rarely starts with a blank model. Instead, it typically builds on actual results together with the approved budget or the previous forecast.

In OneStream, this process is handled through Seeding, supported by the Data Management engine.

With a single click, an administrator or lead controller can create a new forecast scenario—for example, Forecast 3+9—where the first three months are populated with Actuals and the remaining nine months are sourced from the approved budget or the previous forecast.

The system automatically:

• retrieves actual data directly from the consolidation model,
• populates the remaining periods with planning data,
• applies predefined business rules and calculations,
• prepares a complete forecast model ready for planning.

As a result, users begin working with a consistent, fully prepared forecast scenario instead of manually copying data between spreadsheets.

In large organizations, forecasting often involves dozens or even hundreds of users. Coordinating the entire process in Excel can quickly become challenging.

OneStream uses Workflow Profiles to guide users through each stage of the forecasting process. After logging in, each user sees only the tasks assigned to their role.

An important part of the process is Confirmation Rules—validation rules that ensure data completeness and accuracy. If required information is missing, the system prevents the user from completing the workflow.

As a result, all forecasts are based on validated data, and the entire organization works from a single source of truth.

One of the greatest advantages of Rolling Forecast is the ability to respond quickly to changing business conditions.

OneStream makes it easy to create and compare multiple planning scenarios without duplicating models or maintaining multiple versions of spreadsheets.

Instead of manually updating hundreds of values, users can adjust key business drivers such as:

• exchange rates,
• commodity prices,
• sales volume,
• headcount,
• profit margins.

Changing a single driver automatically recalculates the entire financial model.

OneStream also supports top-down planning.

Controllers can enter an annual revenue or cost target, and the system automatically allocates it across individual months based on predefined seasonality patterns or other business allocation rules.

In multinational organizations, changes in exchange rates can have a significant impact on financial performance.

OneStream automatically applies the appropriate exchange rates to different account types and instantly recalculates the entire forecast scenario when currency assumptions change. This enables finance teams to quickly assess the impact of exchange rate fluctuations on group results and perform sensitivity analysis.

Creating multiple forecast versions in Excel typically means copying spreadsheets, leading to version control issues and an increased risk of data inconsistencies.

In OneStream, users can manage multiple planning scenarios simultaneously, including:

• Base Case,
• Best Case,
• Worst Case,
• High Inflation,
• Low Demand.

All scenarios are built on the same business logic and underlying data model, making it easy to compare outcomes quickly and consistently.

Preparing the forecast is only the beginning. Equally important is the ability to quickly understand what is driving the differences between planning scenarios.

The Drill Down capability allows users to navigate seamlessly from high-level results to detailed transactional data.

Analysts can drill down:

• from consolidated group results,
• to a specific legal entity,
• then to an individual account,
• and even to ERP transaction-level data (where integration has been implemented).

As a result, identifying the root causes of variances takes significantly less time than in traditional spreadsheet-based planning.

In financial forecasting, speed is only part of the equation. Equally important is the ability to fully audit the planning process. OneStream provides a comprehensive Audit Trail that records the complete history of every change.

For every data point, users can see:

• who made the change,
• when it was made,
• the previous value,
• the new value,
• whether the change was made manually, through a data import, or by a system rule.

In addition, corporate finance teams can monitor the Workflow status of all business units in real time, making it easy to identify delays and keep the forecasting process on track.

Modern financial forecasting increasingly relies on artificial intelligence. OneStream offers Sensible AI—a suite of AI capabilities purpose-built for finance teams.

The solution can automatically:

• analyze historical data,
• identify trends and seasonality,
• eliminate one-off events,
• generate an AI Baseline Forecast as a starting point for forecasting.

This allows finance professionals to focus on evaluating future business events and assumptions rather than building forecasting models from scratch.

Sensible AI also streamlines financial reporting by generating narrative commentary. Using generative AI, it automatically produces explanations of financial results and key variances, significantly reducing the time required to prepare management reports.

A Rolling Forecast should enable organizations to respond quickly to changing business conditions—not create additional work for the finance team.

OneStream automates forecast preparation, streamlines collaboration across finance teams, supports scenario planning, provides a complete audit trail, and leverages AI to enhance both financial forecasting and reporting.