v3.25.4
Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Feb. 25, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Registrant Name Goldman Sachs BDC, Inc.    
Entity Central Index Key 0001572694    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Shell Company false    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Title of 12(b) Security Common Stock, par value$0.001 per share    
Trading Symbol GSBD    
Security Exchange Name NYSE    
Entity File Number 814-00998    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 46-2176593    
Entity Address, Address Line One 200 West Street    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10282    
City Area Code 312    
Local Phone Number 655-4419    
Document Annual Report true    
Document Transition Report false    
Entity Common Stock, Shares Outstanding   112,569,067  
Entity Public Float     $ 1,232,950
Documents Incorporated by Reference Portions of Goldman Sachs BDC, Inc.’s Proxy Statement for its 2026 Annual Meeting of Stockholders are incorporated by reference in this Annual Report on Form 10-K in response to Part III, Items 10, 11, 12, 13 and 14.    
Auditor Name PricewaterhouseCoopers LLP    
Auditor Firm ID 238    
Auditor Location Boston, Massachusetts    
Auditor Opinion

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated statements of assets and liabilities, including the consolidated schedules of investments, of Goldman Sachs BDC, Inc. and its subsidiaries (the “Company”) as of December 31, 2025 and 2024, and the related consolidated statements of operations, changes in net assets and cash flows for each of the three years in the period ended December 31, 2025, including the related notes (collectively referred to as the “consolidated financial statements”). We also have audited the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations, changes in its net assets and its cash flows for each of the three years in the period ended December 31, 2025 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control - Integrated Framework (2013) issued by the COSO.

We have also previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated statements of assets and liabilities, including the consolidated schedules of investments, of the Company as of December 31, 2023, 2022 and 2021, and the related consolidated statements of operations, changes in net assets and cash flows for the years ended December 31, 2022 and 2021 (none of which are presented herein), and we expressed unqualified opinions on those consolidated financial statements. In our opinion, the information set forth in the Senior Securities table of the Company for each of the five years in the period ended December 31, 2025 is fairly stated, in all material respects, in relation to the consolidated financial statements from which it has been derived.