VAT201 has two due dates, and the one you get depends on how you file

The two dates#

A vendor filing manually submits and pays by the 25th of the month. A vendor filing on eFiling has until the last business day of the month.

Where the 25th is not a business day, it moves back to the business day before it, in the same direction as every other SARS date.

In a typical month that difference is four to six days. It is the same return, the same money and the same vendor, and the only variable is the channel.

Why this is an operations question, not a tax one#

Several days at month end is the period in which your own customers pay you. A business paying VAT on the 25th is funding it out of last month's collections. The same business paying on the last business day may be funding it out of this month's.

That is not a tax planning point and nobody will raise it with you, because it is not a tax question. It is a cash timing question that happens to be decided by a filing preference set years ago and never revisited.

What the return is drawn from#

Output tax comes from what you invoiced, input tax from what you were invoiced, and both are only as good as the completeness of the underlying records for the period.

The recurring problem in a growing business is not the calculation. It is supplier invoices that arrive after the period closed, which either get claimed late or get claimed in the wrong period, and a stock line whose landed cost changed because a duty changed and nobody updated the record.

The one thing to do about it#

Confirm which of the two dates actually applies to you, and check that the date in your own calendar matches it. A reminder set to the 25th on a business that files electronically is costing several days of working capital every month for no reason at all.