Most financial planning is presented as though the future can be predicted. It can't.
Neither can weather. A pilot flying an Instrument Landing System approach doesn't expect the system to tell her what the weather will be at decision height. That isn't what it's for. An ILS exists to provide a reliable reference, a stable course, continuous feedback, and a disciplined framework for making decisions when visibility deteriorates. Financial planning should do the same thing — and most of it doesn't.
Steep, Shallow, and On Glide Slope
A glide slope defines a single nominal descent angle — typically three degrees — but no approach is flown by holding a static number. It's flown by continuously correcting back toward it, because drifting off it in either direction creates a different kind of problem.
Fly steep, and the aircraft descends faster than the glide path calls for. The ground comes up sooner than the approach plan accounted for, and there's less altitude and less time left to correct if something's wrong. In a financial plan, steep looks like an aggressive drawdown — spending down assets, de-risking, or accelerating a timeline faster than the plan actually calls for. It can feel like progress. It's the same problem as arriving early with no altitude left: there's nothing held in reserve if conditions change on the way down.
Fly shallow, and the aircraft is still higher than it should be at a given distance from the runway, trading altitude for time it doesn't have to spend. That eventually shows up as coming in high on short final, floating past the touchdown zone, or going missed for a stabilized-approach violation. In a financial plan, shallow looks like over-caution — holding too much in reserve, deferring decisions that should already have been made, working longer than the plan requires. It isn't dangerous the way steep is. It wastes the one resource the plan exists to manage: time.
On glide slope isn't a straight line held by luck. It's a series of small corrections made continuously, in both directions, all the way to minimums. That's the discipline a financial plan borrows from the instrument — not a single number to hit once, but a target to correct back toward every time conditions push against it.
From a Single Prediction to a Range of Possibilities
This is where possibilities-based planning comes in. An ILS doesn't predict what the airplane will do. It displays where the airplane currently is relative to where it should be, continuously, and leaves the correction to the pilot. It doesn't assume one descent path is guaranteed — it assumes deviation is normal and builds the correction into the system itself.
A financial plan built on a single predicted outcome — one market return, one retirement date, one tax bracket, held constant for thirty years — is a glide path with no needles. Possibilities-based planning replaces the single prediction with a range of plausible paths, and asks the same question an ILS asks continuously: how far off course are we right now, and what correction does that call for?
Goals-based planning already points in this direction. It starts from what a plan needs to accomplish — an income floor, a retirement date, a legacy — rather than from a single forecasted return, and it holds every decision accountable to those goals instead of to a market prediction. Monte Carlo analysis is how that gets tested against a range of possibilities instead of one assumed outcome: it doesn't predict which future will happen, any more than an ILS predicts the weather. It runs the plan through thousands of plausible ones and shows where the corrections need to happen.
What Monte Carlo Actually Tells You
The output most people focus on is a single number: a probability of success. That's real information, and it's worth having.
But a successful retirement is rarely determined by investment returns alone. Career changes. Military retirement. Airline hiring. VA disability. Healthcare. Taxes. Family. Business ownership. These decisions change the trajectory of a plan long before investment returns ever get the chance to. A simulation that models portfolio risk beautifully and never touches the SBP election, the pension lump-sum decision, or the domicile choice at retirement is answering a real question — just not the one that determines most outcomes.
A probability of success is not the same thing as a plan for what happens when conditions change.
Four Instruments, One Discipline
An ILS approach is built on four references. Each one answers a specific question, continuously, all the way to the ground. Financial planning has a version of each.
Glide Slope
Are we descending at the correct rate?
Planning Parallel
Are we spending, saving, and transitioning at a pace the plan can actually sustain?
Localizer
Are we aligned with the runway?
Planning Parallel
Are today's decisions still aligned with the long-term objective, or have they quietly drifted off it?
Decision Height
At a predetermined altitude: continue, or execute a missed approach.
Planning Parallel
There are moments where a decision becomes irreversible — a retirement date, an SBP election, a VA election, a business sale, an airline transition, a Social Security claim. Each one has its own decision height.
Missed Approach
Not a failure. A procedure.
Planning Parallel
Sometimes the safest decision is to preserve optionality and try again under better conditions, rather than force a landing the conditions don't support.
Preserve Optionality at Decision Height
That phrase shows up throughout this firm's work, and it isn't marketing language. It's aviation. A missed approach doesn't end the flight — it holds every option open: another approach, a different runway, a diversion, more time to let conditions improve. The failure mode in instrument flying isn't going missed. It's pressing an approach past decision height without the references required to continue safely, because turning back started to feel like giving up.
Financial planning has the same failure mode. The costly mistakes are rarely the ones where someone paused, gathered more information, and revisited a decision later. They're the ones where an irreversible election got forced through at the deadline because stopping felt like failure. Decision height is exactly the wrong moment to discover a missed approach procedure was needed. It has to be briefed before the approach starts.
The ILS Decision Sequencing System™
This is the entire premise behind the firm's planning framework — the same four references, applied to a financial plan instead of an airplane.
ILS Decision Sequencing System™
- Establish the Income Floor — the localizer lock. Get on centerline before anything else matters.
- Map Lifetime Benefit Streams — the full approach plate, every fix and altitude known in advance.
- Pressure-Test Irreversible Decisions — the decision height briefing, worked out long before the deadline.
- Sequence Tax Buckets — the stepped altitudes flown in the correct order.
- Contain Fragility — the missed approach procedure. Always briefed. Rarely needed. Never optional.
- Optimize Return — flying the last few hundred feet to touchdown, once everything before it is already resolved.
I named the firm ILS Financial because I believe good financial planning resembles a precision instrument approach far more than it resembles predicting the weather. We cannot eliminate uncertainty. We can improve situational awareness. We can establish reliable references. We can make disciplined decisions. And when conditions change, we can execute the appropriate procedure while preserving as many future options as possible.
That's the philosophy behind the firm. And ultimately, that's the philosophy behind the ILS Decision Sequencing System™.