Okla. Stat. tit. 43, § 43-118.3: Request for wage and tax information

On or after April 15th of each year, the obligor or obligee may

make a written request to the other party for the other party's

previous tax year W-2 forms, 1099 form, or other wage and tax

information. This request shall be served upon the other party in

the same manner prescribed for the service of summons in a civil

action, and the original request shall be filed in the court file.

The party receiving such a written request shall provide the

requesting party a copy of the requested information by certified

mail within ten (10) days of receiving the written request. If a

motion to modify child support is subsequently filed by the

requesting party, and it is shown to the court that the non-moving

party failed to comply with this section, the court may award the

moving party his or her attorneys fees and costs incurred as a

result of the failure to provide requested information.