If you have ever tried to plan a long road trip, you know the challenge. Do you map out every single rest stop for the next 2000 kilometers? Or do you just plan the major cities you will pass through? The answer depends on how much detail you need and how far ahead you are looking.
Business Evolution Plans (BEP) in SAS Asset and Liability Management on Viya work the same way. The horizons you choose determine how granular your balance sheet projections will be and how far into the future you can see. Get this wrong, and you are either drowning in unnecessary detail or missing critical turning points in your portfolio evolution.
This post will walk you through everything you need to know about horizons in BEP’s, from choosing the right interval type to some lesser known settings that can save you headaches down the road.
Understanding horizon basics: Where does your journey begin?
Before we look into the different interval types, let us talk about where every BEP starts: Horizon Zero.
When you create a Business Evolution Plan and select your planning data and target variable, the solution automatically populates a column called Horizon 0. This is your starting point, your "you are here" marker on the map. It shows the current value of your target variable, whether that is ending book balance, par balance, or market value, pulled directly from your portfolio data.
Think of Horizon 0 as the baseline against which all your growth or liquidation targets will be measured. If your mortgage portfolio shows 500 million euros in Horizon 0, and you set a 10% growth target for Horizon 1, the system knows exactly what that 10% means.
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Pro tip: If you want market value as your target variable, you need to use the Portfolio Summary table as your planning data. The regular portfolio table does not include market value calculations because those happen during the Preview Portfolio step.
The four interval types: Choosing your planning granularity
SAS ALM gives you four options for how to slice up your planning horizon. Each serves a different purpose, and choosing the right one depends on what you are trying to achieve.
Monthly Intervals
Monthly intervals give you the finest level of control for standard business planning. You specify how many months you want to project, and the system creates that many horizons. If you enter 24 in the interval count field, you get two years of monthly projections.
This works well for detailed operational planning, near term liquidity analysis, and when your business strategy involves month by month targets. The downside is that managing 24 or 36 individual horizon values can get tedious, especially if your growth assumptions do not actually change much from month to month.
Quarterly Intervals
Quarterly is often the sweet spot for many banks. It aligns nicely with financial reporting cycles and board presentations. Most strategic plans operate on a quarterly cadence anyway, so your BEP naturally mirrors how leadership thinks about the business.
With quarterly intervals, an interval count of 8 gives you two years of projections in a much more manageable format than 24 monthly buckets.
Yearly Intervals
Yearly intervals are best for long term strategic planning. If you are modeling a five year business transformation or assessing the impact of a major market shift over an extended period, yearly horizons keep things simple.
The trade off is precision. A lot can change in twelve months, and yearly intervals smooth over all that variation. Use this when the big picture matters more than the quarterly details.
IRRBB Intervals: The Regulatory Option
This is the special one. When you select IRRBB as your interval type, you do not specify an interval count. Instead, the system automatically creates a predefined set of horizons based on Basel regulatory requirements.
The IRRBB interval structure looks like this: ON (overnight), 1M, 3M, 6M, 9M, 12M, 18M, 2Y, 3Y, 4Y, 5Y, 6Y, 7Y, 8Y, 9Y, 10Y, 15Y, 20Y, and 20Y+.
Notice how the granularity changes over time. The near term is sliced finely because that is where interest rate risk has the most immediate impact. As you move further out, the intervals widen because longer term projections naturally carry more uncertainty.
If you are running IRRBB compliance calculations, this is the interval type you need. It ensures your BEP aligns with the standard Basel time bucket specification.
The BEP Horizon Start Interval
Here is a feature that not everyone knows about but can be incredibly useful. When you configure your ALM calculation parameters for a dynamic growth run, you will see a field called BEP horizon start interval.
The default value is 1, which means your analysis starts from the first period in your Business Evolution Plan. But you can set this to any number, even a number greater than the total horizons in your BEP.
Why would you want this? Imagine you created a quarterly BEP back in January with 8 quarters of projections. It is now July, and you want to run an analysis. Setting the horizon start interval to 3 tells the system to skip the first two quarters, which are now in the past, and start from Q3.
This saves you from having to recreate your entire BEP every time you run a new cycle. You built the plan once with a longer time horizon, and now you can "slide forward" through it as time progresses.
Rollover Horizon Date: The performance lever
When running static or dynamic growth analyses that involve rollovers, you will encounter the rollover horizon date setting. This one is primarily about performance, but understanding it helps you avoid confusion in your results.
The rollover horizon date sets a cutoff point for generating rollover transactions. Once this date is reached, the system stops creating new rollover positions. The balance calculation shifts from including current business plus rollover business plus new business, to just current business plus new business.
Why does this matter? Generating rollover transactions is computationally expensive. If you are projecting 20 years into the future, do you really need the system to create detailed rollover positions for year 19? Probably not. Setting a reasonable rollover horizon date, maybe 5 or 10 years out, can significantly speed up your analysis without meaningfully affecting your results for the periods you actually care about.
Here you can see all the settings mentioned above:
Practical tips from the field
After working with Business Evolution Plans across different implementations, here are some lessons learned.
First, match your interval type to your decision cycle. If your ALCO meets monthly, monthly intervals make sense. If strategic planning happens annually, do not create unnecessary complexity with monthly buckets.
Second, remember that homogeneous intervals are required except for IRRBB. You cannot mix monthly and quarterly horizons in the same BEP. If you need different granularity for different time periods, IRRBB intervals handle this automatically, or you may need separate BEPs for different purposes.
Third, use the Excel export feature for complex BEPs. When you have multiple segments with different growth assumptions across many horizons, populating everything in the UI becomes painful. Export to Excel, set up your formulas and references there, validate your numbers, then import back. The solution runs validation checks on import to catch formatting issues before they cause problems downstream.
Fourth, always test in Developing state first. You cannot edit a Production BEP, so make sure everything works correctly before you flip that switch. Use the Testing state for integration checks with your allocation schemes and calculation runs.
Conclusion
Getting horizons right can make the difference between a BEP that actually helps you make decisions and one that collects dust. Think about it the same way you would plan that road trip. How far are you going? How many stops do you need to plan? And most importantly, what will you actually do with the map once you have it?
Whether you go with IRRBB intervals for regulatory work, monthly buckets for operational detail, or yearly projections for the long view, pick what fits how your team actually works. There is no point building a 36 month monthly forecast if your ALCO only looks at quarterly numbers anyway.
For more detailed guidance on configuring Business Evolution Plans, check out the SAS Asset and Liability Management documentation on the SAS support site.
For more information on SAS Risk Management Solutions visit the software information page here. For more information on curated learnings paths on SAS Solutions and SAS Viya, visit the SAS Training page. You can also browse the catalog of SAS courses here.
Abbreviations and terms
ALM: Asset and Liability Management
ALCO: Asset and Liability Committee
BEP: Business Evolution Plan
EVE: Economic Value of Equity
IRRBB: Interest Rate Risk in the Banking Book
NII: Net Interest Income
ON: Overnight (the shortest IRRBB time bucket)
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