Exhibit 99.1

SLM Student Loan Trust 2013-4

Monthly Servicing Report

Distribution Date 09/25/2025

Collection Period 08/01/2025 - 08/31/2025

Navient Funding, LLC - Depositor

Navient Solutions - Master Servicer and Administrator

Deutsche Bank National Trust Company - Indenture Trustee

Deutsche Bank Trust Company Americas - Eligible Lender Trustee

Navient Funding - Excess Distribution Certificateholder

Page 1 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

I.	Deal Parameters

A	Student Loan Portfolio Characteristics	08/15/2013		07/31/2025		08/31/2025
	Principal Balance	$	721,402,856.22	$	131,772,028.12	$	131,063,213.44
	Interest to be Capitalized Balance		12,923,603.00		1,347,582.65		1,389,939.78
	Pool Balance	$	734,326,459.22	$	133,119,610.77	$	132,453,153.22
	Specified Reserve Account Balance		3,744,487.00		- N/A -		- N/A -
	Adjusted Pool⁽¹⁾	$	738,070,946.22	$	133,119,610.77	$	132,453,153.22
	Weighted Average Coupon (WAC)		6.28%		6.94%		6.94%
	Number of Loans		163,648		19,790		19,572
	Aggregate Outstanding Principal Balance - Tbill						-
	Aggregate Outstanding Principal Balance - SOFR			$	133,119,610.77	$	132,453,153.22
	Pool Factor				0.177754136		0.176864217
	Since Issued Constant Prepayment Rate				(58.24)%		(63.34)%

⁽¹⁾ The Specified Reserve Account balance is included in the Adjusted Pool until the Pool Balance is less than or equal to 40% of the original pool.

B	Debt Securities	Cusip/Isin	08/25/2025		09/25/2025
	A	78448AAA1	$	111,188,414.66	$	110,528,621.69
	B	78448AAD5	$	20,600,000.00	$	20,600,000.00

C	Account Balances	08/25/2025		09/25/2025
	Reserve Account Balance	$	748,897.00	$	748,897.00
	Capitalized Interest Account Balance		-		-
	Floor Income Rebate Account	$	107,742.54	$	33,911.94
	Supplemental Loan Purchase Account		-		-

D	Asset / Liability	08/25/2025		09/25/2025
	Adjusted Pool Balance + Supplemental Loan Purchase	$	133,119,610.77	$	132,453,153.22
	Total Notes	$	131,788,414.66	$	131,128,621.69
	Difference	$	1,331,196.11	$	1,324,531.53
	Parity Ratio		1.01010		1.01010

Page 2 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

II.	Trust Activity 08/01/2025 through 08/31/2025

A	Student Loan Principal Receipts
	Borrower Principal		352,820.03
	Guarantor Principal		458,834.22
	Consolidation Activity Principal		334,959.64
	Seller Principal Reimbursement		-
	Servicer Principal Reimbursement		-
	Rejected Claim Repurchased Principal		-
	Other Principal Deposits		-
	Total Principal Receipts	$	1,146,613.89
B	Student Loan Interest Receipts
	Borrower Interest		191,706.33
	Guarantor Interest		21,576.33
	Consolidation Activity Interest		4,652.48
	Special Allowance Payments		78,086.01
	Interest Subsidy Payments		64,151.03
	Seller Interest Reimbursement		0.00
	Servicer Interest Reimbursement		0.00
	Rejected Claim Repurchased Interest		0.00
	Other Interest Deposits		10,379.11
	Total Interest Receipts	$	370,551.29
C	Reserves in Excess of Requirement		-
D	Investment Income	$	9,628.81
E	Funds Borrowed from Next Collection Period		-
F	Funds Repaid from Prior Collection Period		-
G	Loan Sale or Purchase Proceeds		-
H	Initial Deposits to Collection Account		-
I	Excess Transferred from Other Accounts	$	107,742.54
J	Other Deposits		-
K	Funds Released from Capitalized Interest Account		-
L	Less: Funds Previously Remitted:
	Servicing Fees to Servicer		-
	Consolidation Loan Rebate Fees to Dept. of Education		-
	Floor Income Rebate Fees to Dept. of Education	$	(109,640.07)
	Funds Allocated to the Floor Income Rebate Account	$	(33,911.94)
M	AVAILABLE FUNDS	$	1,490,984.52
N	Non-Cash Principal Activity During Collection Period	$	(437,799.21)
O	Non-Reimbursable Losses During Collection Period	$	11,225.12
P	Aggregate Purchased Amounts by the Depositor, Servicer or Seller		-
Q	Aggregate Loan Substitutions		-

Page 3 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

III.	2013-4 Portfolio Characteristics

		08/31/2025								07/31/2025
		Wtd Avg Coupon		# Loans		Principal		% of Principal		Wtd Avg Coupon		# Loans		Principal		% of Principal
INTERIM:	IN SCHOOL		6.77%		18	$	153,417.00		0.117%		6.77%		18	$	153,417.00		0.116%
	GRACE		0.00%		0		-		0.000%		6.80%		2	$	2,105.07		0.002%
	DEFERMENT		6.82%		1,016	$	6,824,588.09		5.207%		6.82%		1,038	$	7,233,635.01		5.490%

REPAYMENT:	CURRENT		6.93%		12,739	$	78,173,568.86		59.646%		6.94%		13,036	$	80,344,775.42		60.973%
	31-60 DAYS DELINQUENT		7.00%		906	$	7,347,126.80		5.606%		6.91%		915	$	6,383,449.53		4.844%
	61-90 DAYS DELINQUENT		6.95%		602	$	4,412,456.50		3.367%		6.99%		472	$	3,950,260.37		2.998%
	91-120 DAYS DELINQUENT		6.95%		303	$	2,485,690.36		1.897%		6.97%		387	$	3,102,503.15		2.354%
	> 120 DAYS DELINQUENT		6.87%		1,429	$	10,728,506.40		8.186%		6.94%		1,389	$	10,865,256.64		8.245%

	FORBEARANCE		7.00%		2,408	$	19,894,214.54		15.179%		6.96%		2,405	$	18,808,802.21		14.274%
	CLAIMS IN PROCESS		6.91%		151	$	1,043,644.89		0.796%		6.91%		128	$	927,823.72		0.704%

TOTAL					19,572	$	131,063,213.44		100.00%				19,790	$	131,772,028.12		100.00%

* Percentages may not total 100% due to rounding

Page 4 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

IV.	2013-4 Portfolio Characteristics (cont'd)

	08/31/2025		07/31/2025
Pool Balance	$	132,453,153.22	$	133,119,610.77
Outstanding Borrower Accrued Interest	$	6,765,017.04	$	6,684,827.76
Borrower Accrued Interest to be Capitalized	$	1,389,939.78	$	1,347,582.65
Borrower Accrued Interest >30 Days Delinquent	$	889,302.52	$	859,182.97
Total # Loans		19,572		19,790
Total # Borrowers		6,235		6,308
Weighted Average Coupon		6.94%		6.94%
Weighted Average Remaining Term		192.02		190.85
Non-Reimbursable Losses	$	11,225.12	$	13,659.49
Cumulative Non-Reimbursable Losses	$	2,712,295.72	$	2,701,070.60
Since Issued Constant Prepayment Rate (CPR)		-63.34 %		-58.24 %
Loan Substitutions		-		-
Cumulative Loan Substitutions		-		-
Rejected Claim Repurchases		-		-
Cumulative Rejected Claim Repurchases	$	145,788.07	$	145,788.07
Unpaid Primary Servicing Fees		-		-
Unpaid Administration Fees		-		-
Unpaid Carryover Servicing Fees		-		-
Note Principal Shortfall		-		-
Note Interest Shortfall		-		-
Unpaid Interest Carryover		-		-
Non-Cash Principal Activity - Capitalized Interest	$	449,384.21	$	475,471.69
Borrower Interest Accrued	$	746,504.91	$	752,090.31
Interest Subsidy Payments Accrued	$	20,476.98	$	20,718.01
Special Allowance Payments Accrued	$	30,855.72	$	30,512.07

Page 5 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

V.	2013-4 Portfolio Statistics by School and Program

A	LOAN TYPE	Weighted Average Coupon		# LOANS		$ AMOUNT		%*
	- GSL ⁽¹⁾ - Subsidized		6.74%		10,503		48,339,868.54	36.883%
	- GSL - Unsubsidized		6.77%		8,522		68,846,138.38	52.529%
	- PLUS ⁽²⁾ Loans		8.46%		547		13,877,206.52	10.588%
	- SLS ⁽³⁾ Loans		0.00%		0		-	0.000%
	- Consolidation Loans		0.00%		0		-	0.000%
	Total		6.94%		19,572	$	131,063,213.44	100.000%

B	SCHOOL TYPE	Weighted Average Coupon		# LOANS		$ AMOUNT		%*
	- Four Year		6.95%		17,201		120,872,965.49	92.225%
	- Two Year		6.79%		1,885		8,009,168.68	6.111%
	- Technical		6.81%		486		2,181,079.27	1.664%
	- Other		0.00%		0		-	0.000%
	Total		6.94%		19,572	$	131,063,213.44	100.000%

*Percentages may not total 100% due to rounding.

⁽¹⁾	Guaranteed Stafford Loan

⁽²⁾	Parent Loans for Undergraduate Students

⁽³⁾	Supplemental Loans to Students. The Unsubsidized Stafford Loan program replaced the SLS program on July 1, 1994.

Page 6 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

VI.	2013-4 Waterfall for Distributions

		Paid		Remaining Funds Balance
Total Available Funds				$	1,490,984.52
A	Trustee Fees		-	$	1,490,984.52
B	Primary Servicing Fee	$	31,021.35	$	1,459,963.17
C	Administration Fee	$	6,667.00	$	1,453,296.17
D	Class A Noteholders' Interest Distribution Amount	$	479,960.14	$	973,336.03
E	Class B Noteholders' Interest Distribution Amount	$	105,774.69	$	867,561.34
F	Reserve Account Reinstatement		-	$	867,561.34
G	Class A Noteholders' Principal Distribution Amount	$	659,792.97	$	207,768.37
H	Class B Noteholders' Principal Distribution Amount		-	$	207,768.37
I	Unpaid Expenses of The Trustees		-	$	207,768.37
J	Carryover Servicing Fee		-	$	207,768.37
K	Remaining Amounts to the Noteholders after the first auction date		-	$	207,768.37
L	Excess Distribution Certificateholder	$	207,768.37		-

Waterfall Triggers
A	Student Loan Principal Outstanding	$	131,063,213.44
B	Interest to be Capitalized	$	1,389,939.78
C	Capitalized Interest Account Balance		-
D	Reserve Account Balance (after any reinstatement)	$	748,897.00
E	Less: Specified Reserve Account Balance	$	(748,897.00)
F	Total	$	132,453,153.22
G	Class A Notes Outstanding (after application of available funds)	$	110,528,621.69
H	Insolvency Event or Event of Default Under Indenture		N
I	Available Funds Applied to Class A Noteholders’ Distribution Amount Before Any Amounts are Applied to the Class B Noteholders’ Distribution Amount (G>F or H=Y)		N

Page 7 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

VII.	2013-4 Distributions

Distribution Amounts

		A		B
Cusip/Isin	78448AAA1		78448AAD5
Beginning Balance	$	111,188,414.66	$	20,600,000.00
Index	SOFR		SOFR
Spread/Fixed Rate		0.55%		1.50%
Record Date (Days Prior to Distribution)	1 NEW YORK BUSINESS DAY		1 NEW YORK BUSINESS DAY
Accrual Period Begin	8/25/2025		8/25/2025
Accrual Period End	9/25/2025		9/25/2025
Daycount Fraction		0.08611111		0.08611111
Interest Rate*		5.01287%		5.96287%
Accrued Interest Factor		0.004316638		0.005134694
Current Interest Due	$	479,960.14	$	105,774.69
Interest Shortfall from Prior Period Plus Accrued Interest		-		-
Total Interest Due	$	479,960.14	$	105,774.69
Interest Paid	$	479,960.14	$	105,774.69
Interest Shortfall		-		-
Principal Paid	$	659,792.97		-
Ending Principal Balance	$	110,528,621.69	$	20,600,000.00
Paydown Factor		0.000908806		0.000000000
Ending Balance Factor		0.152243281		1.000000000

* Pay rates for Current Distribution. For the interest rates applicable to the next distribution date, please see https://images.navient.com/investors/data/abrate.txt.

Page 8 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

VIII.

2013-4 Reconciliations

A	Principal Distribution Reconciliation
	Notes Outstanding Principal Balance	$	131,788,414.66
	Adjusted Pool Balance	$	132,453,153.22
	Overcollateralization Amount	$	1,324,531.53
	Principal Distribution Amount	$	659,792.97
	Principal Distribution Amount Paid	$	659,792.97

B	Reserve Account Reconciliation
	Beginning Period Balance	$	748,897.00
	Reserve Funds Utilized		0.00
	Reserve Funds Reinstated		0.00
	Balance Available	$	748,897.00
	Required Reserve Acct Balance	$	748,897.00
	Release to Collection Account		-
	Ending Reserve Account Balance	$	748,897.00

C	Floor Income Rebate Account
	Beginning Period Balance	$	107,742.54
	Deposits for the Period	$	33,911.94
	Release to Collection Account	$	(107,742.54)
	Ending Balance	$	33,911.94

D	Supplemental Purchase Account
	Beginning Period Balance		-
	Supplemental Loan Purchases		-
	Transfers to Collection Account		-
	Ending Balance		-

Page 9 of 9

Trust 2013-4 Monthly Servicing Report: Collection Period 08/01/2025 - 08/31/2025, Distribution Date 09/25/2025

SLM Student Loan Trust 2013-4 10-D