The cost of not reviewing prior-year tax returns

I had a conversation recently that stuck with me.

An advisor walked through a client’s situation where everything looked fine on the surface. Tax return was filed. Nothing flagged. No red alerts. Nothing urgent to fix.

But when we actually stepped back and looked at the prior year through a planning lens, it was a different story.

There were carryforwards sitting there that were never really incorporated into any forward-looking strategy. A couple of elections that technically got made, but never revisited. And a few opportunities that didn’t seem big at the time, until you saw how they compounded into the next year.

None of it was “wrong.” That’s the interesting part.

It just wasn’t used.

And that’s really where the gap shows up in a lot of planning conversations.

Most of the time, prior-year tax returns are treated as closed files. They get filed, maybe referenced once or twice, and then everyone moves on to the next planning cycle.

But the reality is, those returns are full of decisions that continue to have an impact well beyond the year they were filed in.

What gets missed isn’t usually obvious at the moment. It’s the accumulation of small things:
– A carryforward that never gets worked into a plan
– A strategy that made sense one year, but no one revisited it the next
– A loss or deduction that technically exists, but isn’t being actively used

Individually, none of these feels urgent.

Together, they quietly shape the client’s tax picture for years.

And over time, that’s where the real cost shows up… not in a single missed deduction, but in the fact that planning keeps moving forward without ever fully reconciling what already happened.

The advisors who tend to stand out aren’t necessarily the ones doing more complex strategies. They’re the ones who consistently go back and ask a simple question:

“What are we still carrying from prior years that should be influencing what we do next?”

That shift alone changes the quality of the planning conversation.

Because instead of reacting to what shows up each year, you start building from a complete picture.

And one thing we’ve found helpful in our own process is having a consistent way to look at returns the same way every time, not just depending on memory or experience.

A simple checklist goes a long way there. We use a structured review process (37 points) to make sure we’re not relying on “what we usually check,” but actually working through the return in a consistent way each time.

It’s less about the checklist itself and more about making sure nothing meaningful gets missed just because the file looks familiar.

Happy Tax Planning,
Steven Jarvis, CPA