Tax Planning
Strategic Planning to Benefit from the New GDP Adjustment for PAYG & GST
The GDP uplift factor rising to 5% changes instalment calculations under PAYG and GST—smart planning now protects cash flow and avoids surprises at lodgement.
By NomadicTax Research Team • 5-8 min read • September 2, 2026
## What’s the GDP Adjustment Factor?
The **GDP adjustment factor** updates thresholds used in calculating **GST** and **PAYG instalments** each income year, reflecting economic growth. For **2026-27**, the ATO has set this factor at **5%**, up from **4%** in prior years. ([softwaredevelopers.ato.gov.au](https://softwaredevelopers.ato.gov.au/GDPupliftfactor?utm_source=openai))
*Who is affected?* All taxpayers and businesses using the instalment method to pay GST or PAYG usually via quarterly or substituted accounting periods. It **does not affect** those using own-rate methods where instalments are calculated via income and rates directly. ([softwaredevelopers.ato.gov.au](https://softwaredevelopers.ato.gov.au/GDPupliftfactor?utm_source=openai))
## Implications for Tax & Cash Flow
- **Higher instalment amounts**: 5% uplift means greater estimated tax liabilities, increasing periodic instalment obligations.
- **Better alignment with your actual liability**: For businesses with rising profits, this helps avoid large final tax payments. But for those with declining income, it might lead to overpayments unless you can reduce instalments.
- **Cash flow considerations**: Businesses should prepare for larger instalment payments spread throughout the year, possibly tightening cash flow for seasonal or variable income businesses.
## Actionable Tips for Businesses & Individuals
- **Review revenue and profit forecasts**: If income is expected to drop, apply for reduced instalments or adjust PAYG estimates.
- **Manage working capital**: Plan ahead for instalment spikes at activity statement dates.
- **Track accounting periods carefully**: Substituted accounting period taxpayers whose year started before 1 April 2026 retain 4%; those starting from 1 April 2026 use 5%. ([softwaredevelopers.ato.gov.au](https://softwaredevelopers.ato.gov.au/GDPupliftfactor?utm_source=openai))
## Example Scenarios
- A business with a **1 April 2026** start to its income year must use the 5% adjustment whereas one with **1 January 2026** does **not** and keeps the 4% uplift.
- Suppose a firm’s adjusted taxable income base tax is \$100,000 and instalment income is \$90,000: under a 5% uplift, instalment base becomes \$100,000 × 1.05 = \$105,000; the instalment rate becomes \$105,000 / \$90,000 ≈ 116.7% of prior base rate applied. Compare this with earlier years to assess increase.
## Strategic Moves to Smooth the Transition
- If falling profits are forecasted, apply for an instalment rate reduction.
- If funds available, consider accelerating deductible expenses before cutoff periods to shift more costs into 2026-27.
- Maintain detailed records to support any queries from the ATO on adjustments or estimations.
By understanding the new 5% adjustment and anticipating its effects, taxpayers can better manage instalment payments, avoid cash surprises, and reduce the risk of underpayments or penalties.