Milestone Payment Schedule Calculator

Work out milestone payment schedule instantly with clear inputs, formula shown and shareable results.

About Milestone Payment Schedule Calculator

A milestone schedule should be back-weighted so a meaningful payment remains outstanding until commissioning and acceptance. Front-loading payments removes the buyer's leverage exactly when it is most needed to close out defects.

Formulas

Final milestone

Final % = 100% - Mobilisation % - Design % - Delivery %

Payment

Payment = Contract value x Milestone %

Worked example

With the default values below, Milestone Payment Schedule Calculator returns Final milestone (commissioning) payment of $6,000,000.00. Change any input above and every figure here is recalculated in your browser.

Inputs used

Contract value: 30,000,000
Mobilisation payment: 10
On design completion: 20
On delivery: 50

Results

Final milestone (commissioning) payment: $6,000,000.00
Mobilisation payment: $3,000,000.00
Design completion payment: $6,000,000.00
Delivery payment: $15,000,000.00

Step by step

1Values used
2Final milestone
3Payment
4Final milestone (commissioning) payment= 6,000,000.00
5Mobilisation payment= 3,000,000.00
6Design completion payment= 6,000,000.00
7Delivery payment= 15,000,000.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Indicative estimate only. Fees, entitlements, limits and formulas vary by jurisdiction, statute, policy wording and the facts of the case. This is not legal, tax, insurance or financial advice — confirm with a qualified professional or the relevant authority.

Frequently Asked Questions

How much should be held to the final milestone?

At least 10-20%, in addition to any retention. Anything less and the supplier has little financial incentive to complete punch-list items.

Should milestones be objectively defined?

Absolutely. Each milestone needs a documented, testable acceptance criterion, otherwise payment triggers become a negotiation.