Why Mexico’s Rate Decision on 24 September Tests Its 2027 Budget

Mexico’s government has written a lower interest rate into next year’s budget than its central bank is willing to set. On 24 September, the rate decision and two key data releases arrive on the same day.

Banco de Mexico, the country’s independent central bank, announces its rate decision on Thursday 24 September 2026 at 13:00 Mexico City time. INEGI, the national statistics agency, publishes the September inflation flash and the July activity index the same day.

Why It Matters Beyond Mexico

Banco de Mexico, usually called Banxico, sets Mexico’s benchmark interest rate and targets 3.0% inflation. Its choices travel north, because Mexico was the top source of US goods imports in 2024, the US Trade Representative says.

Goods trade between the two countries reached an estimated US$871.6 billion in 2025, according to the same office. Mexico’s exports hit a record US$664.84 billion last year, and more than 80% went to the United States.

The peso is also the most traded currency from Latin America and the 16th most traded in the world. On 16 September, the US Federal Reserve raised its target range by a quarter point to 3.75% to 4%.

That unanimous US move narrows the gap between US and Mexican rates, the extra yield that draws investors to peso assets. At home, the stakes are fiscal, because the new budget assumes a lower rate than Banxico has set.

Thursday is therefore a test of whether the finance ministry’s arithmetic matches the central bank’s caution. Dollar figures here use 17.1527 pesos per US dollar, the reference rate Banxico determined on 15 September 2026.

What Banxico Has Been Doing

The overnight target rate, the rate banks pay to borrow from each other for a day, is 6.50%. It has stood there since 7 May 2026, after a short path this year.

The board held in February, cut by a quarter point in March and again in May, then held twice. Both holds since the easing cycle ended were unanimous, five votes to none.

That matters more than the level, because a board that split during the cuts now agrees on waiting. The August statement, issued on 6 August, said keeping the rate at its current level would be appropriate.

It also pushed the expected return to the 3.0% inflation target out to the final quarter of 2027. Citi’s September survey of analysts puts the rate at 6.50% through the end of 2027.

The Inflation Number Underneath the Headline

August inflation, published on 9 September, came in at 3.26% over twelve months. The monthly rise was 0.20%, and a year earlier the annual figure had been 3.57%.

That looks like a problem solved, but the core measure stands higher at 3.88%. Core inflation strips out farm produce and energy, so it is the part policy can actually reach.

Analysts surveyed by the central bank expect headline inflation to end 2026 at 3.90%, above today’s figure. In other words, the market expects inflation to rise again before the target is reached.

The Bet Inside the 2027 Budget

Finance Secretary Edgar Amador Zamora delivered the 2027 budget package to the lower house on the evening of 8 September. Total net spending is set at 10.636 trillion pesos (US$620 billion).

Budget revenue is 9.157 trillion pesos (US$534 billion), with tax collection projected at a record 15.9% of output. Growth is assumed at 1.5% to 2.5%, with a central estimate near 2.0%.

The deficit measure falls to 3.9% of output from 4.1%, according to the package. It also assumes a policy rate of 6.0%, while Banxico sits at 6.50% and signals patience.

Why Half a Point Is Not a Rounding Error

BBVA Research, the Spanish bank’s economics unit, has measured the exposure to interest rates. An extra percentage point costs about 37.9 billion pesos (US$2.2 billion), by its estimate.

That would lift debt service from 3.7% to 4.0% of national output, BBVA Research calculates. The gap between the budget’s assumption and the bank’s position is therefore a real fiscal item.

The revenue side is already behind, with income-tax collection down 6% in real terms through July. That left it about 96 billion pesos (US$5.6 billion) short of the approved budget.

A record tax take is being projected by a treasury that is currently missing its existing target. Every quarter point that Banxico keeps above the budget assumption costs money the treasury has not set aside.

What Is Not in the Package

One claim circulating is that the 2027 package raises taxes on soft drinks and video games, but it does not. Those levies were legislated in the 2026 package and took effect in January.

The finance ministry states that there will be no new taxes and no increases in general rates. The tobacco levy rises under a schedule already passed, from 0.8516 pesos (US$0.05) per cigarette to 0.9197 pesos (US$0.05).

The same confusion surrounds tariffs of up to 50% on Chinese cars and other goods. Those covered about 1,400 tariff lines and took effect on 1 January 2026, not in the new budget.

The Pemex Line Everyone Will Argue About

Pemex, the state oil company, sees its budget line fall to about 204.1 billion pesos (US$11.9 billion). That is down from 263.5 billion pesos (US$15.4 billion) approved for 2026.

Federal transfers for its debt service drop to around 81.1 billion pesos (US$4.7 billion), a fall of about 70%. The ministry projects a financial surplus at the company once transfers are counted.

Independent analysts are unconvinced, noting Pemex has received far more in support than it has contributed. The cut assumes a turnaround that has not yet shown up in the company’s own numbers.

Where the Peso Actually Went

There was no exchange-rate fixing on 16 September, because Independence Day is a banking holiday. The last rate before it, determined on 15 September, was 17.1527 pesos to the dollar.

The direction that week was weaker, since the rate had been 16.9707 pesos per dollar on 11 September. Analysts surveyed by the central bank expect 17.50 pesos per dollar by the end of the year.

A headline describing peso strength in mid-September would read the level and miss the trend. A narrower gap with US rates after the Fed’s increase is one more reason to watch that trend.

What It Means If You Earn or Invest in Pesos

If the bank holds, borrowing costs stay where they are and the budget’s arithmetic gets tighter. If it cuts, the budget looks better, but core inflation may get less attention than it deserves.

For savers, a 6.50% rate against 3.26% inflation still leaves a real return, unusual in the region. For borrowers, nothing improves this month, and the next two decisions fall on 5 November and 17 December.

For foreign investors, the question is how much extra yield survives after the Fed’s September increase. The single number to watch on Thursday is not the rate but the core reading in the inflation flash.

What Is Not Yet Known

The September inflation flash has not been published, and any figure circulating now is not official. The July activity index is also unpublished, and third-quarter output data arrives only in November.

It has not been reported whether Congress will keep the 6.0% rate assumption when it amends the package. The fourth round of trade talks with Washington was agreed for September, but no date or readout has appeared.

Frequently Asked Questions

Sources: Banco de Mexico, the August policy statement, Banco de Mexico, the policy announcement calendar, INEGI, the August consumer price release, INEGI, the 2026 publication calendar, Heraldo de Mexico, delivery of the 2027 package, BBVA Research, on the fiscal path and rate sensitivity, INEGI, second-quarter output, Banco de Mexico, the exchange-rate series, USTR, US-Mexico trade figures, Mexico Business News, Mexico’s 2025 export record, US Federal Reserve, FOMC statement of 16 September 2026, Wikipedia, the Mexican peso’s trading rank