Why Parallel49?

The name has two halves, and each one means something specific. "Parallel" is about your accounts. "49" is about the border running between them.

Parallel — two sets of accounts, side by side

Cross-border life doesn't merge your finances into one system — it runs two of them next to each other. An RRSP and a 401(k). A TFSA and a Roth IRA. A CAD earnings history and a USD one. CPP and Social Security both somewhere in the picture. Two parallel account systems, two parallel tax systems, for one person.

That's the problem this site is built around: keeping both sides tracked natively, in their own currencies and under their own rules, right up until the moment a number actually needs converting — instead of collapsing everything into one currency too early and losing track of what's really going on underneath.

49 — the line between them

For about 1,300 miles — from the Northwest Angle, a small exclave of Minnesota reachable only by crossing through Canada first, west to the Strait of Georgia off Vancouver Island — the Canada–US border runs dead straight along 49°N latitude. It's one of the few land borders anywhere that isn't a river, a mountain ridge, or a coastline: a line agreed to on paper in 1818, then marked across prairie, forest, and mountains by survey crews over the following century.

East of Minnesota, the border follows entirely different lines — the Great Lakes, the Maine–New Brunswick boundary, the St. Lawrence — set by earlier, separate treaties. But the 49th parallel is the stretch most people actually picture when they picture "the border," and the one most cross-border Canadians in the western half of the country grew up a short drive from — the line their own two parallel account systems sit on either side of.

Nothing else changed

The rename didn't touch how the site works. Every number you enter stays in your browser's local storage — there's no account, no sign-up, and nothing is ever uploaded to a server. See Methodology & sources for where every figure in every calculator actually comes from.

Head back to the CoastFIRE Calculator to run your own numbers, or read Methodology & sources for the citations behind every figure on this site.