v3.26.1
N-2 - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Nov. 08, 2024
Cover [Abstract]      
Entity Central Index Key 0001944831    
Amendment Flag false    
Securities Act File Number 814-01698    
Document Type 10-K    
Entity Registrant Name Willow Tree Capital Corporation    
Entity Address, Address Line One 450 Park Avenue    
Entity Address, Address Line Two 29th Floor    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10022    
City Area Code 212    
Local Phone Number 218-1090    
Entity Well-known Seasoned Issuer No    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Financial Highlights [Abstract]      
Senior Securities [Table Text Block]
Information about the Company's senior securities (including debt securities and other indebtedness) is shown in the following table as of the end of each of the last two fiscal years. The “-” indicates information that the SEC expressly does not require to be disclosed for certain types of senior securities.
Class and YearTotal Amount Outstanding (1)Asset Coverage Per Unit (2) Involuntary Liquidating Preference Per Unit (3)  Average Market Value Per Unit (4)
Credit Facility
Fiscal Year 2025$495,100 $1,730 $— N/A
Fiscal Year 2024$214,766 $1,926 $— N/A
Subscription Line
Fiscal Year 2025$36,090 $1,730 $— N/A
Fiscal Year 2024$27,980 $1,926 $— N/A
Participation Agreements
Fiscal Year 2025N/AN/A$— N/A
Fiscal Year 2024$11,641 $1,926 $— N/A
(1)Total amount of each class of senior securities outstanding at principal value at the end of the period presented.
(2)Asset coverage per unit is the ratio of the principal balance of the Company’s total consolidated assets, less all liabilities and indebtedness not represented by senior securities, divided by the aggregate amount of senior securities representing indebtedness. This asset coverage ratio is multiplied by $1,000 to determine the “Asset Coverage Per Unit”.
(3)The amount to which such class of senior security would be entitled upon our involuntary liquidation in preference to any security junior to it.
(4)Not applicable because senior securities are not registered for public trading on a stock exchange.
   
General Description of Registrant [Abstract]      
NAV Per Share $ 16.11 $ 15.76 $ 15.69
A&R Credit Facility [Member]      
Financial Highlights [Abstract]      
Senior Securities Amount $ 495,100 $ 214,766  
Senior Securities Coverage per Unit $ 1,730 $ 1,926  
Subscription Facility [Member]      
Financial Highlights [Abstract]      
Senior Securities Amount $ 36,090 $ 27,980  
Senior Securities Coverage per Unit $ 1,730 $ 1,926  
Participation Agreements [Member]      
Financial Highlights [Abstract]      
Senior Securities Amount   $ 11,641  
Senior Securities Coverage per Unit   $ 1,926