Tax deadline comparison | 3 August 2026

South Africa IRP6 vs USA estimated tax

South Africa's August provisional tax period is underway. For individuals and companies with a February year-end the first 2027 provisional tax return and payment are due on 31 August 2026. In the United States the next individual federal estimated tax payment is due on 15 September 2026.

Deadlines at a glance

South Africa: first 2027 provisional tax return and payment, IRP6 2027/01, due 31 August 2026.
United States: third 2026 individual estimated tax payment, Form 1040-ES, due 15 September 2026.
Next U.S. payment: 15 January 2027 for the final 2026 estimated tax period.

South Africa: first provisional period

The South African 2027 year of assessment runs from 1 March 2026 to 28 February 2027. SARS requires the first provisional tax payment within six months from the start of the year of assessment. For a February year-end that deadline is 31 August 2026.

The IRP6 uses an estimate of taxable income for the full year. Companies automatically fall into the provisional tax system. Individuals must determine whether they meet the provisional taxpayer rules and exclusions.

United States: next estimated payment

For U.S. calendar-year individuals the 2026 federal estimated tax dates are 15 April, 15 June, 15 September and 15 January 2027. The payment due 15 September 2026 generally relates to income earned from 1 June to 31 August when using the regular instalment periods.

Estimated payments commonly apply when enough federal tax is not being withheld from income such as self-employment or other income without withholding.

The main difference

South Africa generally has two compulsory provisional tax periods and an optional third top-up payment.
The United States generally uses four individual estimated tax payment dates.
South Africa's individual tax year normally runs from March to February. The common U.S. individual tax year runs from January to December.
A payment to one country does not automatically settle a liability in the other country.

If your income crosses both countries

Do not use the South African deadline as a substitute for the U.S. deadline or the other way around. Tax residence, where the income arose, withholding and foreign tax credits can change the result. Check both revenue authorities and obtain professional cross-border tax advice where necessary.

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