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Funds: ready-made basketsrisk 3 of 5: medium, moves with markets

Stock index ETF

Rules, protection and tax below are for Mexico.

What it is

An ETF that holds every company in an index, in the same proportions, and trades on the exchange like a share. There is no manager choosing stocks, just a rule, which is why the ongoing charge can be a tenth of an active fund's.

This is the instrument behind most of the honest advice you will ever read: buy the whole market cheaply, add to it regularly, and hold for decades. It captures the long-run growth of business without betting on which businesses.

It is still shares. A world index has fallen by half in a bad crash and taken years to recover. The reason it works is that people who kept adding through those years ended up well ahead; the reason it fails is that people sell at the bottom.

How it works

  1. The fund buys the index's constituents and issues shares that trade on the exchange all day.
  2. Large investors keep the price close to the holdings' value by creating or redeeming blocks of shares.
  3. The ongoing charge, typically 0.05 to 0.3 percent a year, is taken from the fund's assets.
  4. Dividends from the companies are paid out or reinvested, depending on the share class.

The honest pros and cons

For

  • The cheapest way to own hundreds or thousands of companies at once.
  • No manager risk: you get the market's return minus a tiny fee.
  • Trades any time the exchange is open, with a small spread.
  • Ideal for regular monthly investing.

Against

  • Falls as hard as the market it copies; a 30 to 50 percent drawdown is normal once a decade.
  • Which index matters: a home-country index is far less spread than a world one.
  • Foreign-listed funds can bring currency risk and withholding tax.
  • Some ETFs use derivatives to copy the index; check it holds the real shares if that matters to you.

Getting it in Mexico

Stock index ETF available

The SIC lists thousands of foreign ETFs on the Mexican exchange in pesos, so a world index fund is one click away in any casa de bolsa app. Fintech brokers allow fractional buys from a few hundred pesos. Local fondos de inversión are the older alternative and usually cost more.

  • Account type: Casa de bolsa or fintech brokerage account (gains on listed shares are taxed at 10 percent; interest carries a provisional withholding and is taxed as income)
  • Your protection: securities are held at Indeval in your name, so they remain yours if the broker fails; no scheme covers market losses (source, checked 2026-09-17)
  • Tax here: gains on exchange-listed ETFs are taxed at 10 percent declared yearly; dividends from foreign ETFs carry withholding abroad (source, checked 2026-09-17)

How to start

  1. Open an account at a casa de bolsa or a CNBV-supervised fintech broker.
  2. Pick a world or S&P 500 ETF on the SIC, or the local IPC tracker.
  3. Buy the same amount every month; fractional buys make small sums work.

Wherever you are

  1. Pick the index first: world or global funds spread furthest; single-country funds bet on one economy.
  2. Compare the ongoing charge and the fund's size; large, cheap and physically backed is the usual choice.
  3. Buy through your broker inside a tax shelter, set up a monthly purchase, and stop checking the price.

Try it

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Getting it from another country

Via United States allowed· available there

Buy SIC-listed US shares and ETFs in your casa de bolsa account, or open a US brokerage account and file the W-8BEN form so dividend withholding drops to 10 percent.

What you gain

  • The SIC gives a huge menu in pesos without leaving the local exchange.
  • Cheap US-listed index funds beat most local fund fees.

What you give up

  • Currency risk: a stronger peso shrinks dollar gains when you convert back.
  • Conversion spreads and wire fees when using a foreign broker.
  • The 10 percent US withholding tax on dividends is credited, not refunded.
  • Tax: gains on SIC and foreign shares are taxed at 10 percent; US dividends carry 10 percent withholding under the treaty with a credit in Mexico (source, checked 2026-09-17)

Currency reality check

The same MXN 1,000 left for 10 years, at each country's savings rate:

Kept in MXN at about 7.7% a year

MXN 2,092

Sent to USD at about 2.5% a year, the account would show

USD 62 the tempting number

Brought back to MXN after the exchange rate moved -10.4%

MXN 1,145 what you can actually spend

Before tax, before fees, and before the risk that the exchange rate does something quite different next time. A higher rate abroad is only a higher return once it has survived the conversion back.

Go deeper

Also called

index tracker, tracker fund, world ETF, S&P 500 ETF, passive fund

Often confused with

  • Domestic shares: Part ownership of a company listed in your own country.
  • Mutual fund: A pool of many investors' money run by a manager who buys a basket of assets for a yearly fee.
  • Leveraged or inverse ETF: A fund that multiplies or reverses an index's daily move; over time the multiplication compounds losses fast.
Stock index ETF in Mexico · wealth-coop