En resumen
Mexico is quietly overhauling its circulating money in 2026: new core metals in the 1 to 10 peso coins, the 20-peso bill fading out, and a new Kukulcán 20-peso coin. Here is what changes, what stays, and what any of it is worth.
If you have a handful of Mexican coins or bills and you have heard that "Mexican money is changing in 2026," it is true, but not the way social media told you. There is no colorful new banknote and no coin worth a fortune. What is actually happening, backed by official decrees in Mexico's federal gazette (the Diario Oficial de la Federación, or DOF), is a quiet, orderly change: new metals inside the circulating coins, the 20-peso bill being pulled from circulation, and a new 20-peso coin featuring the Temple of Kukulcán at Chichén Itzá.
Here is the whole picture in one place, with decree dates and official mintage figures from Banco de México (Banxico, the central bank), so you know exactly what changes, what leaves, and what stays the same. And because US readers keep asking: none of these coins are rare, and the new Kukulcán coin is worth its face value, roughly one US dollar, not the hundreds some sellers claim.
Quick summary: what changes in 2026
| Item | What happens in 2026 | Official source |
|---|---|---|
| 1, 2 and 5 peso coins | Core switches to bronze-plated steel (same design) | DOF, phased in from Dec 2025 |
| 10 peso coin | Core switches to nickel-plated steel (same design) | DOF, July 14, 2026 |
| 20 peso banknote | Being retired, replaced by a coin | DOF, Oct 10, 2025 |
| 20 peso Kukulcán coin | New circulating coin, 26 million minted | DOF, Jan 19, 2026 |
| Commemorative coins | 12 World Cup 2026 coins plus one naval independence coin | DOF, 2025-2026 |
| Older families (bills B, C, D, F; coins B and C) | Being retired, still legal tender | Banxico notices in DOF |
Nothing on this list loses its legal value overnight. Everything in your wallet today still spends. The transition is gradual, which is why most people barely notice it. Let's break it down.
The coins change metal, not design
This is the most important clarification, because it causes the most confusion. When you read "new 10-peso coin in 2026," it sounds like Banxico is releasing a coin with a different picture. It is not. The 10-peso coin will look exactly the same: same size, same design, same gold-colored outer ring.
What changes is the metal in the center. Today the core of the 10-peso coin is silver-colored alpaca (an alloy of copper, nickel and zinc). Starting with the 2026 minting, that core becomes nickel-plated steel. The outer ring stays the same gold-toned aluminum-bronze. Banxico's Board of Governors approved the change on February 27, 2026, and it was published in the DOF on July 14, 2026.
Why the change? Banxico gives three reasons: cheaper to make, harder to counterfeit, and magnetic properties that machines (ATMs, tollbooths, vending machines) read more reliably. Steel is cheaper and tougher than alpaca.
And it is not just the 10. The same program reaches the smaller coins:
- 1, 2 and 5 pesos: the core goes from aluminum-bronze to bronze-plated steel. Phased in from December 2025.
- 10 pesos: nickel-plated steel core, as described above.
All keep their existing design. If one of these "new" coins lands in your change, you will not be able to tell it apart from the old one by eye: the difference is in the metal, not the face. For a collector it matters, because these are distinct composition varieties. For daily spending it is the same coin.
The 20-peso bill is on its way out
Pull out any 20-peso bill you have and take a good look, because its days are numbered. Banxico has confirmed in writing that the 20-peso denomination will stop circulating as a banknote and be replaced by a coin. The retirement of the 20-peso bill (the Benito Juárez note, family F) officially began on October 10, 2025.
One key point: there is no date on which the 20-peso bill stops being worth anything. The retirement is gradual. Here is how it works: when a 20-peso bill reaches a bank, instead of putting it back into circulation, the bank sets it aside and sends it to Banxico. They slowly disappear, but in the meantime they remain valid for any payment. Do not throw them out or rush to exchange them.
The reason, again, is cost versus benefit: a low-denomination bill gets handled constantly, wears out and tears fast, and has to be reprinted often. A coin lasts for years. We cover the full detail in our piece on why the 20-peso bill is disappearing.
The coin replacing the bill: Kukulcán
The replacement for the 20-peso bill is already minted and probably already jingling in your pocket: the 20-peso coin featuring the Temple of Kukulcán, the famous pyramid known as El Castillo at Chichén Itzá.
Here are its official specs:
| Detail | Specification |
|---|---|
| Denomination | 20 pesos |
| Reverse design | Temple of Kukulcán (El Castillo), Chichén Itzá |
| Shape | Dodecagonal (12 sides) |
| Diameter | 30 mm |
| Weight | 12.67 g |
| Materials | Silver-colored alpaca center, aluminum-bronze ring |
| Decree | DOF, January 19, 2026 |
| Minted since | February 18, 2026 |
| Official mintage | 26,000,000 pieces (Banxico, SIE) |
Now the reality check. The Kukulcán is a mass-circulation coin, with 26 million pieces struck. It is not rare and it will not be worth a fortune just because it is new. If someone offers you one "for collectors" at a big markup, it is a scam. It is worth its 20 pesos of face value, roughly a US dollar, and at most a small premium if you find one uncirculated and hold it for years. Its full profile is here: Kukulcán 20-peso coin 2026.
One more warning: an image of a supposed "new 20-peso coin" went viral online and turned out to be fake (Forbes México debunked it). The only new circulating 20-peso coin is the Kukulcán. If you see any other 20-peso coin with odd designs, be skeptical.
Which bills and coins are being retired
Beyond the 20-peso bill, Banxico is retiring several full families. Retired does not mean worthless: it means they are no longer being reprinted or restruck, and they get pulled as they pass through banks.
- Bills being retired: families B, C, D and F. These are the older generations you might still come across.
- Coins being retired: family B (the "nuevos pesos" from 1993) and family C (from 1996). Specific pieces being pulled include the 10-centavo coin from family C, the millennium commemorative 20-peso coin (the "Señor del Fuego," or Lord of Fire), and some commemorative 100-peso coins.
If you have any of these tucked away, do not rush to exchange them. While they remain valid you can spend them, and if a piece is commemorative or well preserved, it may be worth more to collectors than its face value. Check first in the catalog.
The 2026 commemoratives
2026 is a big year for Mexican commemoratives, mostly because of the World Cup. Here are the new ones:
The 12 FIFA World Cup 2026 coins. Banxico issued a full series: 4 bimetallic 20-peso coins for circulation (one per host city plus the national jaguar design), 4 pure silver 1-ounce coins, and 4 pure gold quarter-ounce coins. The bimetallic ones began exchange on May 18, 2026. For the city-by-city breakdown, see the World Cup 2026 coins and how to get them.
The Naval Consolidation of Independence coin. Less known but significant: a bimetallic 20-peso coin marking 200 years since the surrender of the fort of San Juan de Ulúa in 1825, the last Spanish holdout in Mexico. Decreed in the DOF on December 17, 2025, with an official mintage of 3 million pieces, considerably lower than the World Cup coins. Its profile: 20 pesos Naval Consolidation of Independence 2026.
What does NOT change (so you don't panic)
With all the announcements, it is easy to think your money suddenly stopped working. It did not. To be clear:
- No piece loses its legal value in 2026. Everything circulating today still spends.
- The 1, 2, 5 and 10 peso coins look the same. Only the internal metal changes in new mintings.
- The 20-peso bill is still valid while it is gradually retired.
- There is no new colorful banknote or new denomination announced for general circulation.
The 2026 change is under the hood, not on the surface: Banxico is modernizing the metals, retiring the old stock, and shifting the 20-peso denomination to a coin format. All gradual, all orderly, all backed by decree.
Got an old Mexican bill or coin you are not sure about, or a Kukulcán someone tried to sell you as a "rare find"? Post a clear photo in the Pesoteca forum and we will tell you what it actually is and what it is worth.
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