In August, taxpayers in at least five major economies face a convergence of unrelated but consequential tax deadlines, ranging from vehicle licensing in Brazil to income tax declarations in Colombia and Argentina, refund processing in India, and enforcement actions in the United States.

Brazil’s Detran in Pará alerted owners of vehicles with specific plate endings that the annual licensing fee falls due on staggered dates throughout the month; driving with an expired licence is a very serious infraction punishable by a fine, seven points on the licence and vehicle impoundment. Colombia’s Dian published a calendar for 2025 income tax declarations starting 12 August, with filing dates determined by the last two digits of the taxpayer’s NIT; the first group (01–02) must file on 12 August, and the sequence runs through 31 August for digits 25–26. Argentina’s tax authority extended the presentation deadline for the simplified income tax regime to 27 August, although the payment itself was due on 27 July and now accrues monthly interest of 2.75%. In India, the Income Tax Department confirmed that refunds for the 2025-26 fiscal year, for which the filing deadline was 31 July, typically take four to five weeks after e-verification, placing most credits between mid-August and mid-September. The US Internal Revenue Service, meanwhile, warned that a final notice of intent to levy triggers a 30-day window from the date on the letter; failure to respond allows the agency to seize wages, bank accounts and, if necessary, physical property.

Each jurisdiction imposes its own sanctions. In Colombia, late filing incurs a penalty of 5% of the tax due per month, capped at 100%, plus interest. Argentina’s regime applies automatic fines only for non-presentation, but interest runs from the original payment date. The IRS can levy bank funds after a 21-day hold and garnish wages continuously, leaving only a minimal exempt amount. Brazil’s traffic code classifies an expired licence as a very serious offence, with immediate vehicle removal.

The next concrete date to watch is 24 August, when Brazil’s Receita Federal opens consultation for the fourth and final regular refund lot of the 2026 income tax cycle, covering late filers and those who resolved pending discrepancies by 10 August.