How to Say "treasury" in Spanish
The most common Spanish word for “treasury” is “hacienda” — use 'Hacienda' when referring to the government department responsible for collecting taxes and managing public finances, or the system of public finances itself.
hacienda
ah-syen-dahaˈθjenda

Examples
El Ministerio de Hacienda presentó los presupuestos generales.
The Ministry of Finance presented the general budget.
Tengo que hacer la declaración de la renta para Hacienda.
I have to do my tax return for the Tax Agency.
El Ministerio de Hacienda anunció nuevos presupuestos.
The Ministry of Finance announced new budgets.
Capitalization
When you are talking about the specific government department, it is usually capitalized as 'Hacienda'.
Not just 'taxes'
Mistake: “Using 'hacienda' to mean the money you pay (taxes).”
Correction: Use 'impuestos' for the money itself. 'Hacienda' is the office you pay them to.
arca
AR-kaˈaɾka

Examples
Las arcas del Estado están bajo mínimos.
The state coffers are at an all-time low.
La crisis vació las arcas del Estado.
The crisis emptied the state coffers.
El gobierno anunció nuevas medidas para llenar las arcas públicas.
The government announced new measures to fill the public coffers.
El dinero de los impuestos va directo a las arcas municipales.
The tax money goes directly to the municipal coffers.
Almost always plural
When talking about money or the economy, we almost always use this word in the plural: 'las arcas'. When it's plural, you use 'las' instead of 'los' or 'el'.
tesoro
teh-SOH-rohteˈsoro

Examples
El museo exhibe un tesoro arqueológico.
The museum exhibits an archaeological treasure.
Los piratas escondieron el tesoro en una isla remota.
The pirates hid the treasure on a remote island.
Este manuscrito es un tesoro histórico incalculable.
This manuscript is an incalculable historical treasure.
Always Masculine
Even though 'treasure' can be abstract, 'tesoro' is always a masculine noun and uses 'el' or 'un'.
Confusing 'tesoro' with official finances
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