Key takeaways
- Announced May 2026 in the 2026-27 Federal Budget. Dynamic PAYG instalments start 1 July 2027.
- You opt in to an ATO-approved calculation built into accounting software you may already use, and vary payments to fit business activity across the year.
- Draft guideline PCG 2026/D3 says the ATO will not allocate resources to apply or collect general interest charge if you use the Dynamic PAYG calculation method as intended.
- The guideline covers pilot participants and businesses that opt in from July 2027, not the current system.
- Feedback closes 28 August 2026.
- The ATO has not said this makes instalments monthly, has not published the calculation method, and has not said it is compulsory for anyone.
The deadline that is live now
The ATO has published draft practical compliance guideline PCG 2026/D3, titled Dynamic pay as you go instalments general interest charge on excessive variation, ATO compliance approach. Its words on the consultation are short and unambiguous: it encourages you to review the guidance and provide any feedback by 28 August 2026.
That is the same day the quarter 4 superannuation guarantee charge statement and the taxable payments annual report fall due, which is set out in every ATO date in August 2026. If you run a business that pays PAYG instalments, 28 August now carries a lodgment deadline and a consultation deadline.
The general interest charge problem it fixes
To see why the draft guideline matters more than the start date, look at what stops businesses varying their instalments today.
The ATO works out your instalment from your last tax return. If this year is worse than last year, you are paying instalments sized for income you are not earning. You are allowed to vary them down, and varying PAYG instalments sets out how. The catch is that varying too far below your actual liability exposes you to general interest charge on the shortfall. So the safe move has always been to leave the instalment alone and get the money back at assessment, which is exactly the overpayment problem described in why your PAYG instalment is too high.
In the ATO's words, the guidance clarifies its compliance approach and confirms it will not allocate resources to apply or collect general interest charge if you use the Dynamic PAYG calculation method as intended. The guideline applies to pilot participants and to businesses that opt into the initiative from July 2027.
Read that against the current position and the change is the one that actually alters behaviour. Today the risk of getting a variation wrong sits with the taxpayer. Under the draft, using the approved calculation as intended takes the interest risk off the table. That is what converts "you may vary" into "you can afford to vary".
Note the limits carefully. The guideline is a draft, it is a statement of where the ATO will and will not allocate compliance resources rather than a change to the law, and it covers the new method only. None of it applies to a variation you lodge under the current system this quarter.
What changes on 1 July 2027
The ATO says the Government announced a streamlined way for businesses to manage their PAYG instalments in May 2026, as part of the 2026-27 Federal Budget, and that from 1 July 2027 Dynamic PAYG instalments will assist you to vary in line with your current, real-time business conditions.
It describes the change as building on existing work to modernise PAYG instalments, and says you will be able to:
- opt into using an ATO-approved Dynamic PAYG instalment calculation built into accounting software you may already use
- vary your payments to fit your business activity across the year.
Two words in that first bullet carry the design. Opt into, so it is a choice rather than a new obligation. And built into accounting software, which means the delivery path is Xero, MYOB, QuickBooks and the rest rather than a new ATO portal. If your instalments already flow through your accounting package, that is the same path described in PAYG in Xero and MYOB.
During 2026-27 the ATO says it is preparing, including setting up pilot programs and working with software providers and stakeholders. So the practical sequence is: consultation closes August 2026, pilots and software work run through 2026-27, opt-in opens 1 July 2027.
| When | What happens |
|---|---|
| May 2026 | Announced in the 2026-27 Federal Budget |
| 28 August 2026 | Feedback on draft PCG 2026/D3 closes |
| 2026-27 | ATO pilot programs, work with software providers and stakeholders |
| 1 July 2027 | Dynamic PAYG instalments available to opt into |
What the ATO has not said
This measure has attracted secondary coverage that goes well beyond the ATO's own page. Three claims are circulating that the ATO page does not support, and each is worth naming.
| Claim in circulation | What the ATO actually says |
|---|---|
| PAYG instalments go monthly | The ATO page says Dynamic, and describes varying in line with real-time business conditions. It does not use the word monthly anywhere. |
| Monthly reporting becomes mandatory for taxpayers with a history of non-compliance | Not on the ATO page. Sourced only from secondary summaries of Budget material. |
| Here is how the Dynamic calculation works | The ATO has published no calculation method. It says only that it will be an ATO-approved calculation built into accounting software. |
None of those three is necessarily wrong. They are unverified against a primary source, which is a different thing, and they will either be confirmed or corrected when the final guideline and the software specifications are published. This page will be updated at that point.
What to do about instalments meanwhile
Nothing about the current system changes before 1 July 2027. Your instalments are still worked out from your last return, variations still carry general interest charge risk, and the quarterly dates still apply.
The practical steps for this year are unchanged:
- Work out what your instalment should actually be with the PAYG instalment calculator, using the instalment rate or amount on your notice.
- If your income has genuinely dropped, read varying PAYG instalments before lodging a variation, because the estimate you put at T8 is what the interest charge is measured against.
- If you are not sure why you are in the instalment system at all, why you got a PAYG instalment notice explains the entry thresholds.
- Instalments and withholding are two different systems and people mix them up constantly. PAYG withholding vs PAYG instalments separates them.
One more thing worth doing before 28 August: if you have an opinion about how the interest charge relief should work, the ATO is asking. Consultations on compliance guidelines rarely draw responses from small businesses, and this one is about a rule that has kept small businesses overpaying for years.
Frequently asked questions
What are Dynamic PAYG instalments?
When do Dynamic PAYG instalments start?
What is the 28 August 2026 deadline?
Will I still get charged interest if I vary my instalment too low?
Do I have to use Dynamic PAYG instalments?
Does this mean PAYG instalments become monthly?
How is the Dynamic PAYG instalment calculated?
Sources
Fetched 2 August 2026. Every claim on this page traces to the ATO page below. PCG 2026/D3 is cited by the identifier and title the ATO gives it; the instrument itself is not quoted here.
- Dynamic PAYG instalments are coming, have your say (QC107765, last updated 10 July 2026). The single primary source for everything on this page: the 1 July 2027 start, the opt-in mechanism, PCG 2026/D3 and the 28 August 2026 feedback date.
Related
PAYG Instalment Calculator
Work out the instalment from your rate or amount
Open →Varying PAYG Instalments
How to vary, and where the interest risk sits
Open →Withholding vs Instalments
Two systems, routinely confused
Open →
Narelle Hartigan is a CPA-qualified tax accountant with over a decade of experience in Australian personal taxation and payroll. She founded PAYG Calculator Australia to make tax withholding easy for every Australian worker to understand.