Boat EconomicsOwnership Cost
Does Your Reserve Survive a Bad Year?
Stress-test your ownership plan against a stated downside combination: which month your reserve would run short, what's driving it, and how much extra reserve would fix it.
Scenarios here are combinations you define, never a probability-weighted forecast. This does not predict what will happen, it shows what a stated downside would do to your reserve.
A budget that only works in the average year isn't resilient
Most ownership plans are built around a central, expected case: routine maintenance, a normal storage bill, typical fuel use. That plan can still fail in a year where one thing goes wrong, an early engine repair, a storage price increase, or a heavier use season. This tool takes a downside combination you define and checks whether your actual cash reserve survives it.
How this is calculated
The base plan's annual total, insurance, storage, maintenance reserve, fuel, and loan payments, is smoothed evenly across 12 months as a simplifying assumption. The downside scenario adds the extra cost over base as a single lump sum in whichever month you choose it's likely to actually hit. The shortfall month is the first month the running reserve balance drops below your stated floor; the required adjustment is how much extra reserve (or equivalent cost reduction anywhere in the plan) would keep it at or above that floor all year.
Worked example
An $8,000 reserve against a base plan totaling $7,000 a year covers the base case comfortably. A downside where the maintenance reserve jumps from $1,200 to $3,000, an $1,800 unplanned repair landing in month 6, still drops the running reserve below a $1,000 floor by month 9, once the rest of the year's smoothed costs catch up; about $1,800 in extra reserve would have kept it at or above the floor all year.
Common mistakes
Sizing a reserve only against the base plan, with no downside check at all, is the most common gap; a plan that balances exactly against the expected case has no room for anything going wrong. The other mistake is treating a stress test as a prediction; it's a stated scenario, not a forecast of what will happen.
Frequently asked questions
Is this predicting what will actually happen to my costs?
No. The downside scenario is a combination you define, not a probability-weighted forecast. This deliberately avoids assigning any likelihood to it, it only shows what that stated combination would do to your reserve if it happened.
Why does the downside cost land in one specific month?
Real shocks, a major repair, a storage price hike, usually hit at a point in time rather than spreading smoothly across the year. Choosing a month for that lump sum is more honest than smoothing it away, even though the base plan itself is smoothed for simplicity.
What if nothing in my plan actually varies?
Set the downside values equal to your base plan. With no difference between the two, there is no shortfall risk to show beyond what your base plan already implies.
What counts as a "recovery lever"?
Extra reserve, a lower price on the boat itself, a cheaper storage arrangement, more use to justify the cost, or a different access model entirely. This tool quantifies the dollar gap; which lever you actually pull is your call.