Page 9

27 fields

Fields on page 9

Family name

First given name

Second given name

Your date of birth

date of birth (DD MM

birth (DD MM YYYY)

Your permanent address

1.App Add3

Postcode

Your postal address (if different to above)

1.App PostAdd3

Postcode

Home phone number (including area code)

Mobile phone number

Work phone number (including area code)

Your Australian tax file

tax file number

file number

Yes

Your Customer

Reference Number

Number

1.CSRN4

Page 10

35 fields

Fields on page 10

Family name

First given name

Second given name

Other party’s date of

party’s date of birth (DD

date of birth (DD MM YYYY)

Other party’s permanent address

1.Parent Add3

Postcode

Other party’s postal address (if different to above)

1.Parent PostAdd3

Postcode

Home phone number (including area code)

Mobile phone number

Work phone number (including area code)

Yes

Name of bank, building society or credit union

Branch number (BSB)

Account number (this may not be your card number)

Account held in the name(s) of

Yes

Employer’s name

Employer’s address

1.Emp Add3

Postcode

Employer’s phone number (including area code)

Page 11

10 fields

Fields on page 11

The terms of the

Signed legal certificates for all parties

Statement of advice for both parties

1.Dec Signature

On Date (DD MM YYYY)

On completion, insert (DD MM YYYY) (you

completion, insert digital signature YYYY) (you must date this

Page 13

22 fields

Fields on page 13

Yes

The parent(s) paying child support (write full name(s) here)

The receiving parent and/or non-parent carer (write full name(s) here)

Family name

First given name

Second given name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Family name

First given name

Second given name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Family name

First given name

Second given name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Page 14

34 fields

Fields on page 14

Go to Part B on page 16

Yes

Full name

payment period: Weekly

Fortnightly

Monthly

Full name

payment period: Weekly

Fortnightly

Monthly

Full name

payment period: Weekly

Fortnightly

Monthly

Yes

Price Index (CPI)

Weighted National Average CPI

(specify which capital city)

Capital City CPI (specify which capital city)

Other inflation rate

Specify

On 1 July each year

Other

Specify

Yes

During all periods the paying parent is unemployed

income support payment

Page 15

36 fields

Fields on page 15

Week

Fortnight

Month

Yes

(DD MM YYYY)

MM YYYY)

date of your agreement on

page 6.

On this date for all

this date for all children

for all children (DD MM YYYY)

Full name

A.Child 1 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

A.Child 2 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

www.guides.dss.gov.au. This rate increases each year in line with

A.Child 3 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Page 16

28 fields

Fields on page 16

Go to Part C on page 18

Yes

Details of your agreement about non-periodic payments

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Yes

Page 17

30 fields

Fields on page 17

(DD MM YYYY)

MM YYYY)

date of your agreement on

page 6.

On this date for all

this date for all children

for all children (DD MM YYYY)

Full name

B.Child 1 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

B.Child 2 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

B.Child 3 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Page 18

22 fields

Fields on page 18

Go to Part D on page 19

Yes

Details of your agreement about the lump sum amount

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Full name

Date of birth (DD

of birth (DD MM YYYY)

(DD MM YYYY)

Rate lump sum

Lesser percentage (specify)

Page 19

35 fields

Fields on page 19

Go to Part E on page 20

Yes

Details of how you want to modify your child support assessment

(DD MM YYYY)

MM YYYY)

date of your agreement on

page 6.

On this date for all

this date for all children

for all children (DD MM YYYY)

Full name

D.Child 1 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

D.Child 2 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Full name

D.Child 3 AgreeEnd

On the following

the following date for this

date for this child (DD MM

Page 20

19 fields

Fields on page 20

Yes

The agreement is to change or non-parent carer has a care

the agreement

with the reduced care

question 50 is 35% or below)

question 50 is above 35%)

Yes

periodic payments for the affected child(ren) will change to {specify new amount} and the payments for the other child(ren) will stay the same.

Yes

the other parent through a periodic payment (see Part A), non-periodic payments (see Part B) or agree to modify the child support formula assessment (see Part D).

If you need more All parties must sign

Yes

Page 21

42 fields

Fields on page 21

Go to Part G on this page

Yes

suspended or

On this date for all

this date for all children

for all children (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Go to Part H on page 22

Yes

G.LiabilityEndDate

On this date for all

this date for all children

for all children (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Full name

Date agreement to

agreement to end (DD

to end (DD MM YYYY)

Page 22

21 fields

Fields on page 22

Signed legal certificates for all parties

Signature1

On Date (DD MM YYYY)

On completion, insert (DD MM YYYY) (you

completion, insert digital signature YYYY) (you must date this

Signature2

On Date (DD MM YYYY)

On completion, insert (DD MM YYYY) (you

completion, insert digital signature YYYY) (you must date this

Signature3

On Date (DD MM YYYY)

On completion, insert (DD MM YYYY) (you

completion, insert digital signature YYYY) (you must date this

Signature4

Date (DD MM YYYY)

On completion, insert (DD MM YYYY) (you

completion, insert digital signature YYYY) (you must date this

Other Federal · CS1666

Child Support Agreement (CS1666)

This form is used to make a child support agreement between parents and/or non-parent carers and apply for it to be accepted by Services Australia.

Issued by: Services Australia
Form number: CS1666
Jurisdiction: Federal
Length: 22 pages

When do you need this form?

You need this form when you want to create a formal agreement about child support payments with the other parent or carer of your child. This could be to make a new agreement, replace an existing one, or end current child support arrangements.

What you'll need

Details of all parties including parents and any non-parent carers
Information about existing child support assessments or agreements
Care arrangements and percentage of care for each child
Proposed child support payment amounts and payment methods
Legal advice documentation if required for binding agreements

Where to send it

Submit the completed form to Services Australia for acceptance of the child support agreement. You can also access services through your Child Support online account via myGov.

About Ozforms

Ozforms makes it easy to fill in official Australian government forms in your browser. Your data stays on your device — we don't store, log, or transmit anything you type. The PDF is generated locally and ready to download in seconds.

This is the original CS1666 form from Services Australia, unmodified. Learn more about how we work →

Disclaimer. Ozforms is not affiliated with Services Australia or any Australian government agency. We provide a free tool to help you fill in official forms. Always verify form requirements with the issuing agency.