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Taxes (Tables)
12 Months Ended
Dec. 31, 2025
Taxes.  
Schedule of components of the income tax provision

  ​ ​ ​

For the years ended December 31, 

  ​ ​ ​

2023

  ​ ​ ​

2024

  ​ ​ ​

2025

  ​ ​ ​

2025

RMB

RMB

RMB

US$

Current income tax

1,551,288

561,041

31,037

4,437

Deferred income tax

(15,330)

(217,233)

(31,051)

Total income tax expenses (benefit)

1,551,288

545,711

(186,196)

(26,614)

Schedule of reconciliation of China statutory rates to the Group's effective tax rate

  ​ ​ ​

For the years ended December 31, 

  ​ ​ ​

2023

  ​ ​ ​

2024

  ​ ​ ​

2025

Statutory rate in the PRC

25.0

%

25.0

%

25.0

%

Effect of the PRC preferential tax rate

(10.3)

%

(11.9)

%

(24.2)

%

R&D additional deduction

(0.8)

%

(1.5)

%

2.8

%

Reversal due to tax period difference

0.0

%

(14.3)

%

(1.4)

%

Changes in valuation allowance

0.0

%

1.1

%

0.0

%

Non-deductible expenses*

0.1

%

10.5

%

(0.5)

%

Effective tax rate

14.0

%

8.9

%

1.7

%

*

Non-deductible expenses mainly represent expenditures not deductible for PRC tax purposes.

Schedule of deferred tax assets

As of

  ​ ​ ​

As of

  ​ ​ ​

As of

December 31,

December 31,

December 31,

2024

2025

2025

  ​ ​ ​

RMB

RMB

US$

Allowance of expected credit loss

 

15,330

 

133,185

 

19,037

Net operating losses

 

 

254,990

 

36,447

Less: valuation allowance

 

 

(155,612)

 

(22,242)

Deferred tax assets, net

 

15,330

 

232,563

 

33,242

Schedule of taxes payable

As of

As of

As of

  ​ ​ ​

December 31, 

  ​ ​ ​

December 31, 

  ​ ​ ​

December 31, 

2024

2025

2025

RMB

RMB

US$

Income tax payable

 

1,613,840

1,452,052

207,552

Value-added tax payable

 

359,420

57,082

8,159

Total taxes payable

 

1,973,260

1,509,134

215,711