GST Change-of-Use Adjustment Calculator

This calculator works out a GST change-of-use adjustment, the correction you make when the taxable use of an asset changes after you bought it. When a GST-registered person buys an asset, they can claim GST back in proportion to how much it will be used for taxable, business purposes. But intended use and actual use often differ, and use can change over the years, so Inland Revenue requires periodic adjustments to keep the GST claimed in line with the actual taxable use. If you end up using an asset more for taxable purposes than you first claimed, you can claim additional GST; if you use it more privately or for exempt purposes, you must pay some back. This tool estimates that adjustment. You enter the asset's GST-inclusive cost, the taxable use percentage you originally claimed, and the actual or new taxable use percentage, and the calculator works out the GST content of the asset and the adjustment, positive if you can claim more or negative if you must repay. The results update as you type. Use it to estimate an adjustment for a GST return, to understand the effect of a change in how an asset is used, or to plan around the rules. The GST content is three twenty-thirds of the GST-inclusive cost, and the adjustment is that GST content multiplied by the change in taxable use percentage. A positive result means an additional claim in your favour; a negative result means an amount to pay back. The actual rules involve adjustment periods based on the asset's value, a limited number of adjustments over time, and specific calculations for each period, so this is a simplified estimate of a single adjustment. Property and high-value assets have particular rules. Confirm the detail with Inland Revenue or an accountant.

GST content = cost x 3/23. Adjustment = GST content x (new use% - old use%). Positive means an extra claim; negative means a repayment. A simplified single-period estimate.