
FormCT-8379Back(Rev.12/25)
Form CT-8379 Instructions
Purpose: Use Form CT-8379,Nonobligated Spouse Claim,if:
• Youareanonobligatedspouseandallorpartofyouroverpayment
was(orisexpectedtobe)appliedagainst:
• Yourspouse’spastdueStateofConnecticutdebt(suchas
childsupport,studentloan,oranydebttoanyConnecticut
stateagency);or
• Yourspouse’staxdebtowedtoanotherstateortheIRS;and
• Youwantyourshareofthejointoverpaymentrefundedtoyou.
General Instructions
Am I a Nonobligated Spouse?
You area nonobligated spouse, if you meet all of the following
requirements:
• You led a joint Connecticut income tax return reporting an
overpaymentofincometax,allorpartofwhichwasorisexpected
to be applied against past-due child support, a debt to any
Connecticutstateagency,orataxdebtowedtoanotherstateor
theIRSbyyourspouse(theobligatedspouse);
• Youreceivedincome(suchaswages,interest,etc.)reportedon
thejointreturn;and
• YoumadeConnecticutincometaxpayments(suchaswithholding,
estimatedtaxpayments,orpaymentswithanextension)reported
onthejointreturnorqualifyfortheConnecticutearnedincome
taxcreditorhaveapass-throughentitytaxcredit.
Filing the Return: File Form CT-8379 with Form CT-1040,
Connecticut Resident Income Tax Return,Form CT-1040NR/PY,
Connecticut Nonresident or Part-Year Resident Income Tax Return,
or Form CT-1040X,Amended Income Tax Return for Individuals.
Electronic filers: If you are filing electronically, select the
indicator for Form CT-8379 on your Connecticut income tax
return.CompleteFormCT-8379anduploadasanattachment.
Paper filers:ChecktheboxforFormCT-8379onthefrontof
yourConnecticutincometaxreturn.Placethisformontopof
thecompletedConnecticutincometaxreturn.
Ifyoupreviouslyfiledyour2025Connecticutincometaxreturn
andyourrefundwasoffset,donotfileFormCT-1040X. Mail
FormCT-8379separatelyto:
Department of Revenue Services
POBox5035
HartfordCT06102-5035
Attach copies of ALL Forms W-2, 1099 and Schedules
CT K-1 to support income, withholding and any
pass-through entity tax credit claimed on Form CT-8379.
Specic Instructions
Taxpayer Information: Enterthetaxpayerinformationexactlyas
itappearsonyourConnecticutincometaxreturn.Thenameand
SocialSecurityNumber(SSN)enteredrstonthejointtaxreturn
mustalsobeenteredrstonFormCT-8379.
Allocation Items
a. Connecticut adjusted gross income:Enterthejointamount
asreportedonyourjointConnecticutincometaxreturn(Form
CT-1040,Line5;FormCT-1040NR/PY,Line5;orFormCT-1040X,
ColumnC,Line5).Thenseparatelyallocatetheindividualincomes
accordingtowhichspouseearnedtheincome.Thesumofthese
mustequaltheamountreportedasjointincome.
Nonresidents and Part-Year Residents only-Completethe
chartbelow.EnterthejointamountofyourConnecticut-sourced
income as reported on your Form CT-1040NR/PY,Line 6,
or Form CT-1040X, Column C, Line 6. Separately allocate
the Connecticut-sourced income between the two spouses.
The sum of these must equal the amount reported as joint
Connecticut-sourcedincome.
Joint $ .00
Nonobligated Spouse
$ .00
Obligated Spouse $ .00
Connecticut-Sourced Income
(Form CT-1040NR/PY, Line 6, or
Form CT-1040X, Column C, Line 6)
Nonresidents
and Part-Year
Residents Only
b. Total tax:EnterthejointConnecticuttaxliabilityasreportedon
yourjointConnecticutincometaxreturn(FormCT-1040,Line16;
FormCT-1040NR/PY,Line18;orFormCT-1040X,ColumnC,
Line20).
c. Connecticut income tax withheld:EnterthejointConnecticut
withholdingas reported on your jointConnecticut incometax
return(FormCT-1040,Line18;FormCT-1040NR/PY,Line20;or
FormCT-1040X,ColumnC,Line21).Listeachspouse’sshare
separatelyasshownonyourindividualwithholdingforms(such
asW-2sor1099s). Attach ALL Forms W-2/1099.
d. Separate estimated Connecticut income tax payments or
payments made with extension request:Enteranyseparately
paidestimatedConnecticutincometaxpaymentsorpayments
paidwithrequestforextension,intheappropriatespaces.
e. Joint estimated Connecticut income tax payments or
payments made with extension requests: Enter the
total amount of any joint estimated Connecticut income tax
paymentsorpaymentsmadewithrequestforextension.Include
overpaymentsappliedfromthepreviousyeariflingjointlywith
the same spouse.
f. Connecticut earned income tax credit: Enter the amount
reported on your joint Connecticut income tax return (Form
CT-1040,Line20a.;FormCT-1040X,ColumnC,Line22a).
g. Pass-through entity tax credit: Enter the amount reported
on your joint Connecticut income tax return (Form CT-1040,
Line 20c.; Form CT-1040NR/PY, Line 22b.; Form CT-1040X,
ColumnC,Line22c).Listeachspouse’sshareofpass-through
entitytaxcreditseparately.Attach ALL Schedules CT K-1.
h. Joint amount overpaid: Enter the joint amount overpaid as
reported on your joint Connecticut income tax return (Form
CT-1040, Line 22; Form CT-1040NR/PY, Line 24; or Form
CT-1040X,ColumnC,Line27).
Nonobligated Spouse Refund: DRS will calculate the amount
of thenonobligated spouse’s refund. The nonobligatedspouse’s
shareofthejointConnecticuttaxoverpaymentcannotexceedthe
jointoverpayment.
Signature: The nonobligated spouse must sign this form.
Others Who May Sign for the Nonobligated Spouse:Anyone
withasignedLGL-001,Power of Attorney,maysignonbehalfof
thenonobligatedspouse.AttachacopyoftheLGL-001.
Paid Preparer’s Signature: Anyoneyoupaytoprepareyourreturn
mustsignanddateit.PaidpreparersmustalsoentertheirPersonal
TaxIdenticationNumber(PTIN),andtheirrm’sFederalEmployer
IdenticationNumber(FEIN)inthespacesprovided.