How Australian family entitlements interact — the waterfall most families don't see

CCS, FTB-A, FTB-B, PPL, Newborn Supplement, Rent Assistance and child support don't sit in silos. A pay rise, a new job, a partner returning to work, a child turning 5 or 13, an inheritance, a property sale — each ripples across multiple payments at once. Centrelink presents each program on its own page; the interactions are left to the family to work out. This guide is the map: what feeds into what, where the cliffs are, and which decisions tend to surprise families.

This is general reference content — not financial advice. Specific numbers verified against Services Australia and the DSS Family Assistance Guide. Each individual payment also has its own NestWise guide linked below.

The big picture — what's tested against what

So three different income bases drive different payments — combined family ATI (CCS, FTB-A, RA), primary earner ATI (FTB-B), and individual ATI (PPL, child support). A change to ONE income can hit all three bases simultaneously.

What "ATI" actually means

Centrelink uses adjusted taxable income, not just taxable income. ATI = taxable income + reportable fringe benefits + reportable super contributions + tax-free pensions + foreign income + net investment losses − child support paid. (Detail in our ATI explainer.)

For a PAYG employee with no salary sacrifice, ATI ≈ taxable income. For anyone with salary packaging, an investment property, or sacrificed super, ATI can be significantly HIGHER than taxable income. Getting it wrong is the single most common cause of an end-of-FY debt letter.

Run the NestWise ATI Calculator → Free verification of your real Centrelink-adjusted income across all 7 components.

The big "income changed" cascade

When ONE thing moves, here's the chain reaction. (Solid = direct mechanical link; dashed = depends on other thresholds also being crossed.)

Your income rises by $10k
    ↓
Your individual ATI rises
    ├─→ Your PPL eligibility may drop (if crosses $180k cap)
    ├─→ Your child support payable may rise (if you're paying)
    ↓
Combined family ATI rises
    ├─→ CCS rate drops (1% per $5,000 over $85,279)
    ├─→ FTB-A reduces (via tapers at $66,722 and $118,771)
    ├─→ FTB-A supplement might disappear (if crosses $80,000)
    ├─→ Rent Assistance shrinks (rides on FTB-A)
    ↓
If you're the higher-earner partner:
    └─→ FTB-B may cliff to $0 (if you cross $120,007)

If you're the lower-earner partner:
    └─→ FTB-B may taper to $0 (if you cross the secondary cut-off)

A "$10,000 pay rise" can mean a $300/year CCS reduction + a $500/year FTB-A reduction + losing the $938.05 per-child FTB-A supplement entirely + losing $5,000+ of FTB-B if you cross $120,007 + a Rent Assistance reduction. Net out-of-pocket: in some cases, the family is worse off after a small pay rise. That's the cliff trap.

Run the NestWise Extra Day Calculator → The single best tool for seeing the full picture before a work decision.

PPL vs Newborn Supplement — the choice you make at birth

These two can't both pay for the same child:

For most families who qualify for PPL, PPL is ~9× larger — that's the choice. The Newborn Supplement is the meaningful fallback when you don't qualify for PPL (failed work test, individual income over $180k, self-employed without enough pre-birth hours). With twins, you can claim PPL for one and Newborn for the other.

See our PPL guide and Newborn Supplement guide for the eligibility detail.

Child support — feeds back into FTB-A

If you RECEIVE child support, it doesn't count toward your ATI for most purposes — but it DOES feed the Maintenance Income Test for FTB Part A. Above the MIFA threshold, every $1 of child support received reduces FTB-A by 50¢ (floored at the base rate). So increasing your CS payment doesn't translate dollar-for-dollar into higher household income — about half of it disappears into reduced FTB-A.

If you PAY child support, it's deducted from your ATI for ALL Centrelink purposes (CCS, FTB, PPL). So paying more child support can lift your CCS rate or FTB rate — partial offset against the cost.

See our Maintenance Action Test guide for the MIFA threshold and worked examples.

The two biggest cliffs to watch

1. $80,000 family ATI — FTB-A supplement cliff. Cross this and you lose the $938.05 per-child end-of-year supplement entirely. For a family with two kids, that's $1,876/year disappearing on the dollar you crossed at.
2. $120,007 primary earner ATI — FTB-B hard cliff. Cross this and FTB-B drops to $0 (was up to $5,007/year for youngest under 5, plus $459.90 supplement). One dollar matters.

Both can be triggered by a routine pay rise. Both are foreseeable if you model income before accepting the rise. (Our Extra Day Calculator shows BOTH cliffs in one view.)

Where age-up transitions matter

Children moving between age groups can change payment rates:

• Turning 5: FTB-A rate jumps from $227.36/fn to $295.82/fn (for FTB-A maximum-rate children turning 13 actually — first jump is at 13). FTB-B rate drops from $193.34/fn (under 5) to $134.96/fn (5–18). Sport vouchers may unlock (state-specific). Kindy funding becomes relevant (state programs).
• Turning 6: Generally no payment change, but you're now solidly into school-age territory (most state kindy programs are for under-5s).
• Turning 13: FTB-A rate increases from $227.36/fn to $295.82/fn per child.
• Turning 16: FTB-A continues IF in full-time secondary study; ceases otherwise.
• Turning 19 in study: Final cut-off for FTB-A.

The dashboard's "child aged up" detector watches for these and prompts re-verification.

The "salary sacrifice surprise" interaction

A common pattern: family discovers salary sacrifice through a financial-literacy article, sets up a $20k/year sacrifice into super, expecting:

• ~$7k tax savings.
• Lower taxable income → "Centrelink will pay me more."

But Centrelink uses ATI, which adds reportable super contributions back. So:

• Tax bill drops by ~$7k.
• ATI is unchanged — CCS rate, FTB rates, PPL eligibility all the same.
• BUT — at EOFY, if they reported "estimated income" to Centrelink using taxable income instead of ATI, they'll be reconciled at the higher ATI figure and owe back-payments.

The salary sacrifice was great for tax, but didn't change Centrelink — and might cause a debt letter if reported wrong. The fix: always declare ATI (not taxable income) to Centrelink. Our ATI calculator walks through all 7 components.

Practical decisions where this guide matters

Considering accepting a $5–10k pay rise? Model it in our Extra Day Calculator first — for some incomes, the family is genuinely worse off after the rise. For others, it's a strong yes. The answer depends on which cliffs you're near.

Partner returning to work post-PPL? Same calculator. The secondary earner ramping up can cliff FTB-B for the household even if individual income is modest.

Self-employed with variable income? The EOFY recon projection in our Recon tool (paid) shows whether your current YTD income will trigger a CCS / FTB debt at year-end — before the letter arrives.

Negotiating a new child support arrangement? Run both scenarios in our Child Support Estimator and check the FTB Maintenance Income Test impact in our MIT guide.

About to salary sacrifice? Recompute ATI in our ATI calculator — if you're at an income where the salary sacrifice changes nothing for Centrelink, you've still got the tax win, but no entitlement uplift. Just be sure to file ATI (not taxable income) to Centrelink at EOFY.

Quick cross-reference