A child of God's (a Christian’s) sin debt has been paid; Christ Jesus accomplished this on the cross of Calvary when sin was judged.

As far as salvation is concerned, God no longer holds their sin against them. What they have received from God is referred to as judicial forgiveness of sin. It is obtained, once and for all, when one turns to God in repentance through faith in Christ Jesus as Lord and Savior. (Ephesians 1:7; Romans 8:1)

As far as fellowship within God’s family is concerned, however, God’s children still need forgiveness from their Heavenly Father when they sin. This forgiveness is known as parental forgiveness, and it’s the forgiveness the apostle John was speaking of when He wrote to Christians, saying “If we confess our sins, He is faithful and just to forgive us our sins and purify us from all unrighteousness." (1 John 1:9)

Judicial forgiveness has to do with one’s salvation, whereas, parental forgiveness has to do with one’s standing within the family.