Apply the 50/30/20 budgeting rule across multiple currencies. Track needs, wants, and savings when your income and expenses span EUR, GBP, CHF, and more.
Housing, food, utilities, insurance, transport
Entertainment, dining out, subscriptions, hobbies
Emergency fund, investments, debt payoff
Needs/yr
€33k
Wants/yr
€20k
Savings/yr
€13k
The rule allocates half of net income to needs, three tenths to wants and a fifth to savings. It only works when income and spending are measured in the same unit, which is exactly what multi-currency life breaks. Running a separate 50/30/20 for each currency produces three tidy budgets and no usable answer, because rent in one currency and income in another are the same household's problem. Convert everything into one reference currency at a published rate, apply the split once at the top, then check each category against it. Keep the reference currency fixed across the year, because a budget whose unit changes mid-year cannot be compared with itself.
Sources: ECB euro reference exchange rates
Multi-currency households carry expenses that single-currency budgets have no line for. Conversion spread is the obvious one: providers quoting no commission usually take their margin in the rate, and 1% on €2,500 a month is €300 a year. Card payments in a foreign currency often add a further foreign-transaction fee on top of a poor point-of-sale conversion. Then come the duplicates — two mobile contracts, two insurance policies, sometimes two tax filings — and the cost of maintaining minimum balances in several accounts. Budget these as needs rather than treating them as friction, because they are recurring, predictable, and large enough to move the savings line if you ignore them.
Sources: European Commission — PSD2
Two adjustments make the split usable abroad. First, size the emergency fund larger. The standard three to six months assumes you can stay put while you find work; an expat facing redundancy may also face visa expiry, relocation costs and a housing deposit in a new country at the same time, so six to twelve months is the more honest range. Second, treat the currency buffer as part of needs rather than savings. Money held to absorb an adverse exchange-rate move is not discretionary and should not flatter your savings rate. Re-run the split after any rate move above about 5%: the percentages stay the same, but the amounts behind them do not.
Needs 50% · Wants 30% · Savings 20% — of net income converted to one currency
The split only means anything once both sides of it are in the same currency. Convert net income and every category of spending into one reference currency at today's rate, then apply the thirds. Splitting each currency into its own 50/30/20 produces three tidy budgets that add up to nothing you can act on.
Lena earns €4,200 net in Berlin and £900 from UK freelance work, roughly €1,050. Her reference income is €5,250, so needs get €2,625, wants €1,575 and savings €1,050. Her German rent and UK student loan both sit in needs, converted, rather than in two separate budgets.
Budget at a rate slightly worse than the mid-market one. If you convert monthly, 1-2% below mid-market absorbs the spread and leaves the plan intact on a bad month.
Count transfer fees as a need, not an afterthought. Two conversions a month at 1% on €2,000 is €480 a year.
Keep one reference currency for the whole budget even if you hold four. Switching reference mid-year makes the trend meaningless.
Hold each currency's spending money in that currency. Converting at the till is the most expensive way to pay.
Re-check the split after every exchange-rate move above 5%. The percentages stay the same; the amounts behind them do not.
This split uses figures you entered by hand. Wealthos pulls balances from banks across Europe, converts them at live rates, and keeps the 50/30/20 view current without a spreadsheet.
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Wealthos pulls balances from 3,000+ EU and UK banks, converts them at live rates, and splits your month into needs, wants and savings.
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