How to track your spending in Chile

Chile has a quirk almost no other country shares, and that no international finance app accounts for: a large share of big expenses isn't denominated in pesos. It's in UF.

Rent, mortgage payments, some insurance policies and various contracts are set in Unidades de Fomento, an inflation-indexed unit that is restated daily. Your salary, meanwhile, is in pesos and adjusts when it adjusts.

UF is, in practice, a second currency

And it's worth treating it as one, because it behaves like one: an expense of 25 UF is the same expense every month in UF and a different number every month in pesos.

That has two consequences for tracking:

First: the peso amount isn't comparable month to month. If your rent went up this month, that isn't a change in your situation — it's the UF. Comparing the peso figure against last month's measures inflation, not your decisions.

Second: what to watch is the proportion. If your UF-denominated costs went from 40% to 46% of your peso income over six months, that is information, and it's exactly what UF hides from you if you only look at amounts.

The practical way to handle it: log the expense at the peso amount you actually paid that month, and let the conversion lock to that date. Don't recalculate closed months. The principle is the same as any two-unit tracking, and it's developed in tracking two currencies.

What the Cuenta RUT solves and what it doesn't

It's the country's most widespread account, which is why so many people use it for everything: salary, transfers, debit, purchases. That helps — there are fewer sources to consolidate than in other countries in the region — but it isn't enough, for two reasons:

• Cash is still outside it. What you took out of an ATM shows up as a withdrawal, not as the six expenses it turned into.
• The statement describes the movement, not the reason. The merchant name isn't your category, and half the time it isn't even recognisable.

You still need your own place where the expense gets classified by you. Covered in tracking without connecting a bank.

Instalments and your credit line

Buying in instalments is common, and the effect on a budget is the same as elsewhere in the region: you make the purchase today and it appears on the next several statements. Log the instalment as recurring, not the purchase.

The number to check before any large purchase is how much of your next statement is already committed. It's in interest-free instalments.

The emergency fund, with UF in the mix

Here there's a decision that doesn't exist in other countries: if your essential expenses are partly in UF, an emergency fund entirely in pesos loses purchasing power against your own costs.

This isn't investment advice — that's beyond this post — but it is a calculation principle: size the fund on your real essential expenses, including the ones denominated in UF, and revisit it when the proportion changes. The calculation is in emergency fund.

In one line

Treat UF as a second currency, log what you actually paid in pesos that month without recalculating later, watch the share of your income rather than the amount, and size your emergency fund on your real expenses rather than your salary.

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