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Mexico Proposes Higher Bank-Interest Withholding in 2026 as IMEF Warns of Impact on Informal Savers

Finance officials describe it as an in‑year withholding adjustment, not a higher tax bill.

Overview

  • The 2026 fiscal package raises the provisional ISR withholding on bank interest to 0.9% from 0.5%, subject to congressional approval.
  • SHCP says the change redistributes payments through the year and keeps exemptions for balances under 206,000 pesos and for people earning under 400,000 pesos annually.
  • In an SHCP example, a saver with 500,000 pesos would have 4,500 pesos withheld during the year and owe about 237 pesos at filing, with total ISR unchanged at 4,737 pesos.
  • IMEF leaders warn up to 48 million potential savers—especially informal workers and non‑filers—could be unable to credit the withholding, encouraging a shift to cash or alternative institutions.
  • Tax experts note the retention is calculated on capital each month, which could reduce liquidity for depositors, and the current 0.5% rate remains until the Chamber of Deputies and the Senate vote.