Income Tax Act 2007

General collection rules - Provisional tax - Table R1: Summary of instalment dates and calculation methods for provisional tax

RC 22: Calculating instalments in transitional years: standard method

You could also call this:

“How to calculate tax instalments when your tax year changes”

If you need to pay provisional tax using the standard method during a transitional year, you need to follow some special rules. A transitional year is when your tax year changes.

For most of your payments during the year, you’ll use a formula to work out how much to pay. The formula looks at how much provisional tax you owe for the whole year, how many payments you’ve made so far, and how many payments you need to make in total. It also takes into account any tax you’ve already paid.

You might make either two or three payments during the year. If you make three payments, they’re due on dates B, D, and F. If you make two payments, they’re due on dates C and F.

For your final payment of the year, you’ll use a different formula. This formula considers how many days are in your transitional year compared to your previous tax year. It also looks at how much tax you’ve already paid.

The formulas used to calculate these payments are quite complex, but they’re designed to make sure you’re paying the right amount of tax throughout your transitional year.

Remember, all of this is specifically for people using the standard method to calculate their provisional tax during a transitional year. If you’re not sure if this applies to you, it’s a good idea to check with an expert or the tax department.

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View the original legislation for this page at https://legislation.govt.nz/act/public/1986/0120/latest/link.aspx?id=DLM1519864.

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RC 21: Paying provisional tax in transitional years, or

“How to pay provisional tax during a change in your business's financial year”


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RC 23: Calculating instalments in transitional years: estimation method, or

“Estimating provisional tax instalments for a transitional year”

Part R General collection rules
Provisional tax: Table R1: Summary of instalment dates and calculation methods for provisional tax

RC 22Calculating instalments in transitional years: standard method

  1. This section applies to a person liable to pay provisional tax using the standard method in relation to instalments of provisional tax payable in a transitional year under section RC 21.

  2. For an instalment date other than the date of the final instalment, the person must pay an amount calculated using the formula—

    (person's provisional tax × instalments payable÷ total instalments) − tax previously payable.

    Where:

    • In the formula in subsection (2),—

    • person’s provisional tax is the person’s provisional tax liability under section RC 5(2) or (3):
      1. instalments payable is the number of instalments that the person has in the transitional year on or before the instalment date:
        1. total instalments is whichever of the following applies:
          1. 3, for a person who pays on instalment dates B, D, and F; or
            1. 2, for a person who pays on instalment dates C and F:
            2. tax previously payable is the amount for the transitional year of the person’s provisional tax payable before the instalment date.
              1. For the final instalment, the person must pay an amount calculated using the formula—

                (person's provisional tax × transitional year days÷ preceding year days) − tax previously payable.

                Where:

                • In the formula in subsection (4),—

                • person’s provisional tax is the person’s provisional tax liability under section RC 5(2) or (3):
                  1. transitional year days is the number of days in the person’s transitional year:
                    1. preceding year days is the number of days in the person’s preceding tax year:
                      1. tax previously payable is the amount of provisional tax for a tax year calculated on the basis of the person’s transitional year that is payable before the instalment date.
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