The question from u/BoudaSmoke is the right one, and the answer matters more than most spreadsheet users realize. Yes, the WEEKNUM formula defaults to a January start, and yes, that creates friction when your reporting follows an April-to-March tax year. But the real issue isn't the formula's default behavior, it's that we accept a calendar-year framework as the only framework, when our actual work rarely respects that boundary. For anyone managing budgets, forecasts, or compliance deadlines, the tax year is the year that counts. Forcing that reality into a calendar-year function means adding helper columns, writing offset formulas, or manually adjusting week counts every single time. That's not a technical limitation; it's a design gap.
What this reveals is a deeper truth about how we use spreadsheets. The tools we lean on were built for general purposes, but our work is specific. A tax-year week number isn't an edge case, it's a core requirement for millions of people across the UK, India, Canada, and beyond. The fact that this user has to ask whether they need to build a workaround says more about the tool than about their question. They shouldn't have to translate their business logic into calendar-year terms just to get a number that makes sense in their world. The formula should meet them where they are, not the other way around.
The practical takeaway here is straightforward: if your spreadsheet tool forces you to contort your data to fit its defaults, you're spending effort on the wrong problem. The fix isn't to memorize a conversion trick or to build a fragile nested formula that breaks when the tax year shifts. It's to recognize that the tool should serve your workflow, not define it. Whether that means finding a function that accepts a start date parameter, using a custom formula that accounts for the April offset, or switching to a platform that treats fiscal periods as first-class citizens, the goal is the same. Reduce the distance between your mental model and your spreadsheet.
So, to answer the user directly: no, you shouldn't have to build a separate conversion cell. That's a workaround, not a solution. The better path is to question why the tool makes you do the extra work in the first place. If your spreadsheet can't handle a tax year without gymnastics, that's a signal to explore options that align with how you actually operate. The data is yours; the year is yours. The formula should follow.