The Operating Cost Adjustment Factors (OCAFs) for fiscal year (FY) 2020 were published on November 22, 2019 in the Federal Register
https://www.federalregister.gov/documents/2019/11/22/2019-25389/notice-of-certain-operating-cost-adjustment-factors-for-2020
These factors are used for adjusting cost-adjustment-factors-for-2020 or establishing Section 8 rents under the Multifamily Assisted Housing Reform and Affordability Act of 1997 (MAHRA), as amended, for projects assisted with Section 8 Housing Assistance Payments. The factors are effective February 11, 2020.
The FY 2020 Multifamily Utility Allowance Factors, which may be used to adjust baseline utility allowances prepared in accordance with Housing Notice 2015-04, are also now available on HUDUser https://www.huduser.gov/portal/datasets/muaf.html#2020