The Hidden Risk in Relying on Back-Casted Index Data

Each spring brings the routine recalculation of AG 49-A compliant maximum illustrated rates. This year, it also brought something less routine: the effective date of new regulations that fundamentally change how historical index performance can be presented in IUL illustrations and supplemental reports. For advisors who’ve built client conversations around how an engineered index would have performed, this one matters. 

A Pattern of Tightening 

AG 49 has been revised three times since its 2015 introduction, and the pattern has been consistent — each iteration tightened the screws on illustrated performance. 

The original regulation established standardized illustration guidelines and introduced caps on maximum illustrated crediting rates. Five years later, AG 49-A responded to carriers that had found ways to optimize around those limits, adding new constraints on loan illustrations and tightening the rate methodology. The 2023 revision applied further restrictions specifically targeting uncapped, multiplier, and bonus index strategies. Every round reduced what could be shown on paper. If you’ve been in this business through all of it, you felt each one. 

The 2025 Update Is Different 

What regulators enacted in 2025 — effective April 1, 2026, and referred to by some as AG 49-C — breaks from that pattern in one important way: illustrated performance is completely untouched. The target this time is the historical narrative that surrounds the illustration. Specifically, the back-casted data that shows how an engineered index would have performed had it existed decades earlier. 

The rules are specific. Historical performance data in illustrations and marketing materials is now limited to actual index history, with a hard cap of twenty-five years. Back-casted and hypothetical data is eliminated entirely. Any index with less than ten years of real history can no longer include historical performance tables. And supplemental historical comparisons — often the documents doing the heaviest lifting in advisor-client conversations — are restricted outside of the formal illustration. 

For advisors, the practical effect is immediate: some newer engineered indices will show a dramatically shorter track record, and others may disappear from illustrations altogether. The story those indices told — compelling in large part because back-casted data could be constructed to look attractive — can no longer be told the same way. 

What It Actually Means 

This shifts the conversation. “Which index looks best on paper” becomes a less useful frame when the paper shows less. What replaces it is a focus on how the policy is structured, how it’s allocated, and how it’s managed over time — a harder conversation in some ways, but a more defensible one. 

The broader signal is worth paying attention to as well. Every version of AG 49 has been aimed at the same underlying concern: whether client expectations set by illustrations are reasonably aligned with what a policy is likely to actually deliver. Regulators have now addressed both the performance numbers and the narrative built around them. That’s not a coincidence — and it’s probably not the last word on the subject. 

How carriers respond beyond simple compliance remains to be seen. There’s reason to think this regulation could influence how new indices are designed going forward. For now, the immediate implication is clear: the supplemental data that may have anchored your index conversations is changing, and the client conversation needs to adapt with it.