US municipal bonds and Treasury interest in Spain

Many American retirees who apply for the Spanish non-lucrative visa hold a large slice of their wealth in fixed income built for US tax efficiency: municipal bonds that pay federally tax-free interest, and US Treasuries that are exempt from state tax. Inside the US, that structure is deliberate and often excellent. The problem is that it was designed for a US taxpayer, and once you spend more than 183 days a year in Spain you are generally a Spanish tax resident taxed on your worldwide income. Spain does not recognise the US concept of a tax-exempt bond. The interest that arrives entirely tax-free on your US return can become fully taxable in Spain.

This page explains how Spain treats US municipal and Treasury interest, why US citizens face a particular "no-credit" trap on munis, what the US–Spain tax treaty does and does not do, and what to review before you relocate. It is general information, not tax advice, and the exact result depends on your figures and residence facts.

"Clients often assume their muni portfolio stays tax-free when they move. My job is to flag early that Spain taxes that interest, so they can model the numbers and, where it makes sense, restructure before they become resident rather than after."

Why "tax-free" US bonds are not tax-free in Spain

The US exemption for municipal bond interest is a feature of US federal law. It exists because Congress chose not to tax interest paid by states and municipalities. It is not a characteristic of the bond itself, and it has no effect outside the US tax system. Spain taxes its residents on worldwide income and applies its own categories. When Spanish law looks at your muni coupon, it sees interest from a debt instrument, which is ordinary savings income, regardless of the fact that the issuer is a US city or state and regardless of how the US treats it.

The same logic applies to Treasuries in reverse. Treasury interest is exempt from US state income tax but fully taxable at US federal level. Spain does not care about the state-level exemption either. For a Spanish resident, the meaningful question is simply: is this interest income received by a Spanish tax resident? If yes, it belongs in the Spanish savings base. The comfortable US planning that made these instruments attractive does not travel with you across the Atlantic.

How Spain taxes interest: the savings income base

Spain splits personal income into a general base (salary, pensions, most rental income) and a savings base (dividends, interest and capital gains on assets). Interest from bonds, Treasuries, bank accounts and CDs falls in the savings base. In 2026 the savings base is taxed on a national scale that does not vary by autonomous community:

Savings income band	Rate
First €6,000	19%
€6,000 to €50,000	21%
€50,000 to €200,000	23%
€200,000 to €300,000	27%
Over €300,000	30%

So a retiree with, say, €40,000 of annual municipal bond interest that pays zero US tax would, as a Spanish resident, expect Spanish tax in the low-to-mid five figures on that same income. The savings scale is the same whether the interest comes from a muni, a Treasury, a corporate bond fund or a Spanish deposit; what changes between instruments is not the Spanish rate but whether any foreign tax credit is available to reduce double taxation.

Municipal bonds and the no-credit trap

For US citizens the municipal bond case is worse than simple double taxation, because there is no double tax to relieve. Relief from double taxation works through a foreign tax credit: you pay tax in one country and credit it against the tax on the same income in the other. With municipal interest, the US already charges nothing. There is no US tax on that coupon to credit. If Spain then taxes it, the Spanish tax is a straight net cost, with nothing on the US side to offset it against.

This is the same structural pattern that catches other US-tax-free income for Spanish residents, such as Roth IRA distributions and certain veterans' benefits: the US zero rate, so valuable at home, provides no shelter once Spain applies its own tax and there is no US liability to absorb it. A muni ladder that looked highly efficient in retirement planning can quietly become one of the least efficient ways to hold money as a Spanish resident, precisely because its whole advantage was a US exemption you no longer benefit from.

Non-US applicants (for example UK, Canadian or other nationals holding US munis) do not have the US citizenship overlay, but they still face Spanish tax on the interest and should look at the position in their own home country. The muni exemption is a US-person benefit; for anyone who is Spanish-resident, it does not reduce the Spanish bill.

Treasuries, T-bills and bank CDs

US Treasuries and T-bills sit differently. Their US advantage is exemption from state income tax, not federal, so a US citizen still pays US federal tax on Treasury interest. Because there is a real US tax on that income, a foreign tax credit position is usually available to relieve the overlap with Spanish tax, subject to the ordering and sourcing rules that apply to US citizens abroad. The result is closer to ordinary double-taxation relief than to the muni no-credit trap, although the credit is rarely a perfect one-for-one and the mechanics should be modelled rather than assumed.

One US government instrument does not belong in this section, and the difference is not a technicality. Series EE and I savings bonds pay no annual interest at all: the interest accrues untaxed inside the bond for up to thirty years and is taxed in a single moment, which can put the US charge and the Spanish charge in different tax years and defeat the credit described above even though both countries tax the income. If your US government holdings include savings bonds rather than marketable Treasuries, read that page instead of this one.

Bank CDs and money-market interest are treated by Spain the same way: savings income on the 19%–30% scale. The practical planning question for a retiree with a large cash and short-bond allocation is whether the after-tax yield, measured as a Spanish resident, still justifies the holding, or whether a different structure produces a better net result once Spanish tax and reporting are included.

What the US–Spain tax treaty does

The US–Spain income tax treaty defines interest broadly to include income from government securities and from bonds, which squarely covers Treasuries and municipal bonds. Under the treaty, interest is generally taxable in the country where the recipient is resident. For a US retiree living in Spain, that residence country is Spain. So the treaty does not shield the interest from Spanish tax; if anything it confirms Spain's primary right to tax it.

What the treaty does provide is a framework for avoiding genuine double taxation where both countries tax the same income, mainly through the foreign tax credit and, for US citizens, special re-sourcing rules that allow US-source income to be treated as foreign for credit purposes. Those rules matter for Treasuries, where there is US tax to relieve. They do little for munis, where there was no US tax in the first place. The treaty is a mechanism for splitting a tax bill between two countries, not for recreating a US exemption inside the Spanish system. Our overview of the US–Spain tax treaty for retirees covers the wider picture.

Reporting: Modelo 720 and wealth tax

Beyond income tax, US bonds held offshore feed into Spain's asset-reporting and wealth-tax systems. A brokerage account holding munis and Treasuries above the reporting thresholds generally has to be declared on Modelo 720, the foreign asset declaration, and the same holdings count towards the wealth tax and solidarity levy depending on your region and net worth. Interest and coupons are income rather than assets, so they belong on the income return, while the underlying bond and account balances belong on the asset declarations. Getting this split right avoids both under-reporting and needless duplication.

Because your US broker keeps issuing US tax forms (1099-INT, 1099-OID and the like) and Spain works from its own categories, the same instrument is described two different ways by two systems in the same year. A coordinated approach that maps each US form onto the correct Spanish box is what keeps the two returns consistent. See also our note on US brokerage accounts after moving to Spain.

Planning before you become resident

The cleanest time to act is before you trigger Spanish residence. Once resident, selling appreciated bonds can create Spanish-taxable capital gains, so the decision to keep or restructure a muni and Treasury portfolio is easier to manage while you are still solely a US taxpayer. That does not mean everyone should sell; for some retirees the interest is modest, the Spanish tax is tolerable, and simplicity wins. For others, particularly those with large tax-free muni ladders generating substantial coupons, the after-tax picture as a Spanish resident is materially worse and worth restructuring.

Sensible steps usually include modelling your bond income under the Spanish savings scale, separating munis (no US credit) from Treasuries (US federal tax, credit likely available), checking capital gains before any pre-move sales, and coordinating the result with your overall retirement income tax plan and your visa proof-of-income file. The immigration application and the tax plan are linked: the same portfolio has to satisfy the consulate as evidence of means and behave sensibly under Spanish tax once you arrive.

Munis and Treasuries can still have a place in a Spanish resident's portfolio, but the reason you bought them may no longer apply. Decide that on the numbers, before you move, not after.

Before and after residence, side by side

Question	As a US resident	As a Spanish resident
Municipal bond interest	Federally tax-free	Savings income taxed 19%–30%
Treasury / T-bill interest	Federal tax, state-exempt	Savings income taxed 19%–30%
US citizen credit on munis	Not needed (0% US tax)	No US tax to credit — Spanish tax is a net cost
US citizen credit on Treasuries	Not needed at state level	US federal tax usually supports a credit position
Asset reporting	US broker forms only	Modelo 720 and wealth tax may also apply

General information, not legal or tax advice. Spanish tax residence, savings income rates, foreign tax credits, wealth tax and reporting obligations are fact-specific and should be reviewed with qualified US and Spanish tax advisers before you act.