Here's a real-world problem that looks simple until you try to solve it. Tracking PTO accrual with a cap sounds straightforward, but as this user discovered, the standard approach breaks the moment someone takes time off after hitting the maximum. The formula they described works fine for an employee who never reaches 100 hours, but it fails for the exact scenario that matters most: what happens when someone accrues beyond the cap and then uses leave.
The core issue is that traditional spreadsheets treat time as a straight line. They calculate total accrued hours from the hire date, cap the result at 100, and call it done. But that logic assumes accrual stops permanently once the cap is hit. In reality, the employee continues to "earn" hours each day, even if those hours don't show up in the balance. When they take PTO and drop below 100, the spreadsheet doesn't know which hours were already accounted for and which were "lost" to the cap. So it either returns 100 forever, or it incorrectly subtracts used hours from the maximum, treating the cap as a ceiling that can be lowered.
What this user really needs is a formula that tracks a running balance with a reset condition. The logic should be: start with zero, add daily accrual, cap at 100, subtract any hours used, and repeat. That means the formula must reference the previous day's balance, not just the hire date. A simple approach is to use a helper column that stores the running balance day by day, with an IF statement that checks whether yesterday's balance was at the cap. If it was, today's accrual is zero until the balance drops below 100. If it wasn't, add the daily accrual as usual. This mirrors how actual PTO systems work: you stop earning when you're full, and you start again when you use some.
The practical takeaway is that spreadsheet formulas are only as smart as the logic we build into them. The user's initial MIN formula is a good start, but it treats the cap as a static wall rather than a dynamic threshold. The fix requires thinking in terms of state: is the employee currently capped or not? That's a conditional that spreadsheets handle well, but only if you structure the data to track each day's balance independently. For anyone wrestling with similar accrual problems, the solution isn't a more complex single formula. It's a column that remembers yesterday's balance and makes today's decision based on it. That's the difference between a formula that calculates numbers and one that actually manages a policy.