Does this calculator use my actual NDIS plan data?

No — this is a general planning calculator that uses figures you enter manually. It does not connect to the NDIS portal or your actual plan. Always confirm real figures with your plan manager, the NDIS portal (myplace) or the NDIA.

Can unspent NDIS funds roll over to the next plan?

Generally, NDIS plan budgets do not automatically roll over between plan periods, though this is subject to change in NDIA policy. Significant underspend can also prompt a review of funding levels at the next plan. Always check current NDIA guidance, as policy in this area has changed over time.

Why does Core Supports pace differently to Capacity Building?

Core Supports funding is typically flexible and can move between sub-categories (e.g. transport, consumables, assistance with daily life), so it often has more even week-to-week spend. Capacity Building funding is usually tied to specific goals and providers, and spend can be lumpier depending on service availability and session frequency.

NDIS Plan Budget Calculator — Free Allied Health Calculator

🎯

You're three-quarters through a support coordination review and a participant asks whether their plan will actually last the full 12 months at the current rate of spending — before you can advise them, you need the numbers in front of you.

NDIS Plan Budget Calculator

NDIS

Total plan budget ($)

Amount spent so far ($)

Months elapsed

Total plan length (months)

Sustainable monthly spend = Remaining budget ÷ Months remaining Ideal even-pacing spend to date = (Total budget ÷ Plan length) × Months elapsed. Comparing actual spend against this benchmark shows whether the plan is tracking ahead, behind or on pace.

Reference: NDIS — Managing your plan budget

ℹ️ Estimate only — verify against your current NDIS plan and pricing arrangements with your plan manager or the NDIA. AHPRA-registered practitioners should confirm scope against practice standards.

1 What this calculator does

Estimates whether an NDIS plan is on track to last its full term by comparing actual spend against an even-pacing benchmark, then calculates the sustainable monthly spend needed for the remainder of the plan. Useful for participants, plan managers and support coordinators doing a mid-plan check-in.

2 Formula & professional reasoning

Ideal spend to date = (Total budget / Plan length) x Months elapsed
Variance = Actual spend - Ideal spend to date
Sustainable monthly spend = (Total budget - Actual spend) / Months remaining

NDIS plans are funded as a lump sum for a fixed period, but supports are typically delivered and invoiced continuously. Even pacing (spending proportionally to time elapsed) is a reasonable default assumption unless the participant's support needs are known to be front- or back-loaded. Comparing actual spend to the even-pacing benchmark surfaces both overspending (risk of running out of funds before plan review) and underspending (risk of supports being under-utilised, which can affect funding at the next plan review). The sustainable monthly spend figure re-forecasts based on what's left, not the original plan.

3 Worked examples

⚠️ Illustrative example only — not clinical or professional instruction.

Basic

On-track mid-plan check

Given: Total budget $24,000, plan length 12 months, 6 months elapsed, $11,500 spent

Working: Ideal spend to date = 24000/12 x 6 = $12,000 | Variance = 11500-12000 = -$500

Answer: Sustainable spend: $2,083/month | Status: On track (variance within 5%)

💡 A small underspend this early is normal — services often ramp up gradually at the start of a plan.

Standard

Early overspend flag

Given: Total budget $45,000, plan length 12 months, 4 months elapsed, $22,000 spent

Working: Ideal = 45000/12 x 4 = $15,000 | Variance = 22000-15000 = +$7,000 (~15.6% of budget)

Answer: Sustainable spend: $2,875/month for remaining 8 months (down from $3,750/month average) | Status: Overspending

💡 At this pace, spend needs to drop by roughly 23% for the remaining months, or the plan is likely to run out before the review date.

Advanced

Late-plan underspend before review

Given: Total budget $60,000, plan length 12 months, 10 months elapsed, $35,000 spent

Working: Ideal = 60000/12 x 10 = $50,000 | Variance = 35000-50000 = -$15,000 (25% underspend)

Answer: Sustainable spend: $12,500/month for remaining 2 months | Status: Significant underspend

💡 A large underspend this close to review can prompt the NDIA to reduce funding at the next plan — worth reviewing with the participant whether unmet support needs explain the gap.

4 Sanity check

Even-pacing tolerance

Variance within ±5% of ideal spend to date is generally considered 'on track'

Small month-to-month fluctuations are normal and not cause for concern

Overspend risk

Variance above +10-15% of total budget mid-plan warrants a support plan review

Consider whether support intensity has genuinely increased or whether costs have crept up

Underspend risk

Sustained underspend below 70% of ideal pace by the final quarter can affect the next plan review

May reflect provider availability issues, not reduced need — document the reason

Category-level check

This tool works at the whole-of-plan level — repeat for Core, Capacity Building and Capital categories separately since they don't transfer freely

Core Supports is flexible between sub-categories; Capacity Building and Capital generally are not

5 Common errors

Error	Cause	Consequence	Fix
Applying total-plan pacing to a single funding category	Entering the whole plan budget when the question is really about Core Supports only	Misleading pacing result since categories have different rules and typical spend patterns	Run the calculator once per category (Core, Capacity Building, Capital) rather than only at the whole-plan level
Ignoring one-off large purchases	Treating a lump-sum AT or home modification purchase the same as ongoing weekly supports	Sustainable monthly spend appears artificially low after a big one-off item	Exclude one-off capital purchases from the pacing calculation, or note them separately when interpreting the result
Using elapsed calendar months instead of service-delivery months	Counting months where no services were actually able to be delivered (e.g. waitlist, hospital stay)	Understates the real sustainable spend rate needed once services resume	Use months of active service delivery where relevant, and note any gaps for context
Treating variance as a hard rule rather than a conversation starter	Assuming any variance means something has gone wrong	Unnecessary alarm or complacency without checking the underlying reason	Use the variance figure to prompt a conversation with the participant/plan manager about why spend differs from even pacing — not as an automatic red flag