You hit your number. Which currency do you spend from?

Which currency should you spend from in retirement when your savings and your life are in different currencies? Measure in the currency you spend, live from a reserve, and refill it without timing the exchange rate.

You have reached your number. The savings are big enough, and after years of building, the question quietly flips. It is no longer how to grow the money. It is how to spend it. And when your savings sit in one currency while your life is paid for in another, say your pot is in dollars and you will retire to Portugal on euros, spending comes with a second question stacked on the usual one: which currency do you take the money from, and how much can you safely take each year across two? The short version: measure the whole plan in the currency you spend, live from a reserve held in that currency, and top that reserve up on a schedule, not on a guess about the exchange rate.

There is no single correct way to run this, but one practical approach builds on the reserve from part 2, the hedging post. You built that reserve in the years before retiring. Now it is the thing you actually live from, and here is one sensible way to use it.

Measure the plan in the currency you spend

The first decision is quiet, but it sets up everything else. Pick the main currency your future life is priced in, and use it as the plan’s measuring stick. Put both your savings and your yearly spending into that currency, then work out your withdrawal rate from those two numbers, meaning how much of the pot you can safely take out each year. Your bills are in euros, so euros are the measuring stick. If you will genuinely spend in more than one currency, say you support family abroad or split the year between two countries, keep those apart rather than mashing everything into one figure.

Measure only in your savings’ currency and you can miss what actually changed for your life. Your pot can sit flat in dollars while quietly becoming worth more or less in euros as the exchange rate moves. It is the euro figure that decides what you can afford, so that is the one to plan in.

Live from the reserve

With that spending reserve in place, your everyday bills come out of it, instead of a sale and a currency conversion every time. The reserve is simply the next stretch of spending held as cash and safe short-term bonds, in the currency you spend. That is what keeps the grocery bill away from the exchange rate: a weak month does not reach it, because the money is already in the right currency. You refill the reserve now and then, rather than converting for every bill.

Refill on a rule, not a hunch

The reserve runs down as you spend, so you top it back up from your savings from time to time, often as part of your once-a-year tidy-up: selling whatever has grown too big and topping up what has shrunk, sometimes called rebalancing. You sell and convert then. A set schedule refills the reserve without tying every month’s spending to that day’s markets or exchange rate. Having a rule matters more than trying to pick the perfect moment.

This is not a bet that the rate will get better. The reserve is finite, so you will refill it eventually whatever the rate does. What it buys you is not being forced to convert right after a bad market or currency move. Deliberately waiting for a good rate with no reserve at all, that is the trap. The reserve is the plan.

Which pot to draw from first

Where taxes and account rules do not force your hand, that same refill doubles as the tidy-up: sell whatever has grown beyond its share of the plan. But in real retirement accounts, tax and withdrawal rules often decide which account you draw from first, and for a cross-border household the tax rules of both countries can pull hard. The currency layer just adds one preference on top: refill the reserve in the currency you spend, so the money waiting to be spent is already in the right currency and not exposed to another swing before you use it.

The early-retirement danger, doubled

Early retirement has a particular risk. A run of bad years right at the start does lasting damage, because you are selling to live while your savings are down. (The jargon for this is sequence risk.) For a cross-border retiree it can strike twice: what matters is your return after converting into the currency you spend, so a falling market and a bad exchange-rate move can pile on top of each other in exactly the years when withdrawals hurt most.

The defences are the ones you already have, used on purpose. The reserve means you sell and convert less right after a bad patch. A willingness to trim spending a little after bad years can make a real difference over a long retirement. And the familiar 4% rule was built for a normal-length retirement; a much longer one may call for a lower starting rate or a more flexible one. None of this asks you to forecast the exchange rate.

How fjordFIRE helps you see it

fjordFIRE does not run your withdrawals, but it shows you the plan in the terms that matter. It holds each account in its own currency, adds them into one total at daily rates in whatever currency you choose, and separates what your investments did from what the exchange rate did. So when your total moves, you can see which one it was, tell whether your actual spending power changed, and spot when the reserve needs topping up.

Read next: Earn in one currency, live in another: should you hedge? · The 4% rule, for people who don’t retire in America.

Companion tools: FIRE Number calculator · Emergency Fund calculator.

Common questions