I meant to buy a flat in my second year here.

Then life had other plans. A hard stretch I won’t lay out in full — climbing out of something, mostly — then a year of just making things stable again, then a year given over to the language. That last one wasn’t only vocabulary drills: it was the inburgering exams — reading, listening, speaking, and KNM, the Knowledge of Dutch Society paper — the civic-integration set you clear on the way to staying here for good. Suddenly it’s the middle of year five, the year residency actually comes into view, the exams close and booked, the language nearly done, and I can feel the capacity opening back up. So: time to actually look.

Two things pushed me from “someday” to “now.” One was a clear-eyed write-up by fellow expats on what buying in the Netherlands actually involves — the kind of thing that turns fog into a checklist. The other was watching someone I train with go through it in the next lane over. On paper a simpler case than mine — and still it wasn’t simple: between freelance income, some investments and a student loan, he spent two weeks redoing his bookkeeping just so a private-banking consult could tell him whether he’d get a mortgage at all, and for how much. Watching someone do the hard part beside you is weirdly motivating.

There’s a tempting shortcut here: put your gross salary into the ABN calculator and out comes a number. If you’re a straightforward salaried case, that number is most of your answer. Mine isn’t, and I suspect most people’s aren’t once they actually look. (Patrick McKenzie has quietly rewired how I think about personal finance — treat it as a system you can inspect, not a mood you’re in.) The real number isn’t just salary. There’s the 30% ruling — the expat tax break that ends for me on a known date in September, quietly taking a chunk of net income with it. A raise landing next month. An employee share-purchase plan that pays out a couple of times a year — you buy in at a discount, so a little profit is dependable and the rest rides the market. And kosten koper — the cash you need on the table to transact at all, which no affordability calculator ever shows you. Too many moving parts to hold in your head and still call it honest.

I’d done a smaller version of this years ago, in Saint Petersburg. There the Raiffeisen app just showed me — a clean breakdown of what I spent, decent analytics built right in. The surprise then, and again now, is that spend is mostly stable; you assume your money life is chaos and it mostly isn’t, you just haven’t looked at it straight. Here, no Dutch bank gives me anything close to that. If I wanted the picture, I’d have to build it.

So I did. I put my payslips, my income, and my spend into a planning model — good-planning, the swamp extension I built off Bovolon’s framework — and instead of a vibe I got an analysis grounded in facts. Where the money actually goes. What could be trimmed and what can’t. What I can genuinely afford. What my cashflow looks like now, in a year, and after the ruling ends in September. What shapes a mortgage could take around all of it.

Here’s the part worth stealing, and it’s not the spreadsheet. The model isn’t a budget. It’s a state machine for a decision — Bovolon’s four layers, made queryable. What I’m assuming, each assumption tied to a signpost that tells me when it’s breaking. What I’ve actually committed money to — because the real plan is the commitments you’ve funded and protected, not the boxes on a Gantt chart. How those commitments line up in time. And the part that earns its keep under pressure: a ceiling and a floor. A ceiling — the first place success would bind — with relief pre-cleared before I hit the trigger. A floor — tripwires that fire pre-decided pullbacks, and a maximum loss I’ve drawn a line at and won’t cross. A plan you can only admire tells you the target. A plan you can steer tells you what to do when reality moves.

The benefit I didn’t expect was quieter than that. Writing the tripwires down didn’t make the risk smaller — it took it out of my head. The thing that used to circle at one in the morning — what if this, what if that — is now a line in a model with an answer I already decided, calmly, in daylight. I don’t re-litigate it every night. I decided it once, and the model holds it for me.

What came out the other end was, in effect, the package you’d pay a financial adviser and a mortgage adviser for — except it came out of Claude and the planning skill, in an afternoon. And the same line from the other piece applies: that analysis is most of what those advisers sell, but the responsibility to manage it is still mine. The model doesn’t carry the consequence home. I do.

The flat is the visible decision. The plan underneath is the real one — the shape I test every apartment against. Knowing my limits before I started looking didn’t make the choice for me. It just means that when the right place shows up, I’ll already know whether I can say yes.