Exhibit 99.1

MONTHLY SERVICER'S CERTIFICATE

CARMAX BUSINESS SERVICES, LLC

CARMAX AUTO OWNER TRUST

SERIES 2013-4



Collection Period		06/01/17-06/30/17
Determination Date		7/10/2017
Distribution Date		7/17/2017

Additional information, including defined terms, can be found in the prospectus on the SEC's EDGAR system (http://www.sec.gov) under File No. 333-189212-02.



Pool Balance
1.	Pool Balance on the close of the last day of the preceding Collection Period			$	160,684,653.97
2.	Collections allocable to Principal			$	10,828,308.12
3.	Purchase Amount allocable to Principal			$	0.00
4.	Defaulted Receivables			$	291,034.77
5.	Pool Balance on the close of the last day of the related Collection Period			$	149,565,311.08
	(Ln1 - Ln2 - Ln3 - Ln4)
6.	Total number of Receivables outstanding on the close of the last day of the related Collection Period			23,251
7.	Initial Pool Balance			$	1,000,000,005.06
		Beginning of Period		End of Period
8.	Note Balances
	a. Class A-1 Note Balance	$	0.00	$	0.00
	b. Class A-2 Note Balance	$	0.00	$	0.00
	c. Class A-3 Note Balance	$	0.00	$	0.00
	d. Class A-4 Note Balance	$	93,684,653.94	$	82,565,311.05
	e. Class B Note Balance	$	22,000,000.00	$	22,000,000.00
	f. Class C Note Balance	$	20,000,000.00	$	20,000,000.00
	g. Class D Note Balance	$	20,000,000.00	$	20,000,000.00
	h. Note Balance (sum a - g)	$	155,684,653.94	$	144,565,311.05
9.	Pool Factors
	a. Class A-1 Note Pool Factor	0.0000000		0.0000000
	b. Class A-2 Note Pool Factor	0.0000000		0.0000000
	c. Class A-3 Note Pool Factor	0.0000000		0.0000000
	d. Class A-4 Note Pool Factor	0.6788743		0.5982994
	e. Class B Note Pool Factor	1.0000000		1.0000000
	f. Class C Note Pool Factor	1.0000000		1.0000000
	g. Class D Note Pool Factor	1.0000000		1.0000000
	h. Note Pool Factor	0.1556847		0.1445653
10.	Overcollateralization Target Amount			$	5,000,000.03
11.	Current overcollateralization amount (Pool Balance - Note Balance)			$	5,000,000.03
12.	Weighted Average Coupon	%		7.37		%
13.	Weighted Average Original Term (months)	months		68.11
14.	Weighted Average Remaining Term (months)	months		21.94
Collections
15.	Finance Charges:
	a. Collections allocable to Finance Charge			$	1,048,402.52
	b. Liquidation Proceeds allocable to Finance Charge			$	540.08
	c. Purchase Amount allocable to Finance Charge			$	0.00
	d. Available Finance Charge Collections (sum a - c)			$	1,048,942.60
16.	Principal:
	a. Collections allocable to Principal			$	10,828,308.12
	b. Liquidation Proceeds allocable to Principal			$	241,169.57
	c. Purchase Amount allocable to Principal			$	0.00
	d. Available Principal Collections (sum a - c)			$	11,069,477.69



17.	Total Finance Charge and Principal Collections (15d + 16d)	$	12,118,420.29
18.	Interest Income from Collection Account	$	7,068.19
19.	Simple Interest Advances	$	0.00
20.	Available Collections (Ln17 + 18 + 19)	$	12,125,488.48
Available Funds
21.	Available Collections	$	12,125,488.48
22.	Reserve Account Draw Amount	$	0.00
23.	Available Funds	$	12,125,488.48
Application of Available Funds
24.	Servicing Fee
	a. Monthly Servicing Fee	$	133,903.88
	b. Amount Unpaid from Prior Months	$	0.00
	c. Amount Paid	$	133,903.88
	d. Shortfall Amount (a + b - c)	$	0.00
25.	Unreimbursed Servicer Advances	$	0.00
26.	Backup Servicing Fees and Unpaid Transition Expenses
	a. Monthly Servicing Fee	$	2,500.00
	b. Unpaid Transition Expenses and Indemnity Amounts (Capped at $175,000)	$	0.00
	c. Other Unpaid Backup Servicing Fees	$	0.00
	d. Amount Paid	$	2,500.00
	e. Shortfall Amount (a + b + c - d)	$	0.00
27.	Class A Noteholder Interest Amounts
	a. Class A-1 Monthly Interest	$	0.00
	b. Additional Note Interest related to Class A-1 Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class A-1 Monthly Interest	$	0.00
	d. Total Class A-1 Note Interest (sum a - c)	$	0.00
	e. Class A-2 Monthly Interest	$	0.00
	f. Additional Note Interest related to Class A-2 Monthly Interest	$	0.00
	g. Interest Due on Additional Note Interest related to Class A-2 Monthly Interest	$	0.00
	h. Total Class A-2 Note Interest (sum e - g)	$	0.00
	i. Class A-3 Monthly Interest	$	0.00
	j. Additional Note Interest related to Class A-3 Monthly Interest	$	0.00
	k. Interest Due on Additional Note Interest related to Class A-3 Monthly Interest	$	0.00
	l. Total Class A-3 Note Interest (sum i - k)	$	0.00
	m. Class A-4 Monthly Interest	$	99,930.30
	n. Additional Note Interest related to Class A-4 Monthly Interest	$	0.00
	o. Interest Due on Additional Note Interest related to Class A-4 Monthly Interest	$	0.00
	p. Total Class A-4 Note Interest (sum m - o)	$	99,930.30
28.	Priority Principal Distributable Amount	$	0.00
29.	Class B Noteholder Interest Amount
	a. Class B Monthly Interest	$	31,350.00
	b. Additional Note Interest related to Class B Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class B Monthly Interest	$	0.00
	d. Total Class B Note Interest (sum a - c)	$	31,350.00
30.	Secondary Principal Distributable Amount	$	0.00
31.	Class C Noteholder Interest Amount
	a. Class C Monthly Interest	$	32,500.00
	b. Additional Note Interest related to Class C Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class C Monthly Interest	$	0.00
	d. Total Class C Note Interest (sum a - c)	$	32,500.00
32.	Tertiary Principal Distributable Amount	$	0.00



33.	Class D Noteholder Interest Amount
	a. Class D Monthly Interest	$	43,333.33
	b. Additional Note Interest related to Class D Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class D Monthly Interest	$	0.00
	d. Total Class D Note Interest (sum a - c)	$	43,333.33
34.	Quaternary Principal Distributable Amount	$	6,119,342.86
35.	Required Payment Amount (Ln 24 + Ln 26 + (sum of Ln 27 through Ln 34))	$	6,462,860.37
36.	Reserve Account Deficiency	$	0.00
37.	Regular Principal Distributable Amount	$	5,000,000.03
38.	Remaining Unpaid Servicer Transition Expenses, if any	$	0.00
39.	Additional Servicing Fees, if any	$	0.00
40.	Remaining Unpaid Backup Servicer Indemnity Amounts, if any	$	0.00
Collection Account Activity
41.	Deposits
	a. Total Daily Deposits of Finance Charge Collections	$	1,048,942.60
	b. Total Daily Deposits of Principal Collections	$	11,069,477.69
	c. Withdrawal from Reserve Account	$	0.00
	d. Interest Income	$	7,068.19
	e. Total Deposits to Collection Account (sum a - d)	$	12,125,488.48
42.	Withdrawals
	a. Servicing Fee and Unreimbursed Servicer Advances	$	133,903.88
	b. Backup Servicing Fee and Unreimbursed Backup Servicer Advances	$	2,500.00
	c. Deposit to Note Payment Account for Monthly Note Interest/Principal	$	11,326,456.52
	d. Deposit to Reserve Account	$	0.00
	e. Excess Collections (Deposit to Certificate Payment Account for payment to Certificateholder)	$	662,628.08
	f. Total Withdrawals from Collection Account (sum a - e)	$	12,125,488.48
Note Payment Account Activity
43.	Deposits
	a. Class A-1 Interest Distribution	$	0.00
	b. Class A-2 Interest Distribution	$	0.00
	c. Class A-3 Interest Distribution	$	0.00
	d. Class A-4 Interest Distribution	$	99,930.30
	e. Class B Interest Distribution	$	31,350.00
	f. Class C Interest Distribution	$	32,500.00
	g. Class D Interest Distribution	$	43,333.33
	h. Class A-1 Principal Distribution	$	0.00
	i. Class A-2 Principal Distribution	$	0.00
	j. Class A-3 Principal Distribution	$	0.00
	k. Class A-4 Principal Distribution	$	11,119,342.89
	l. Class B Principal Distribution	$	0.00
	m. Class C Principal Distribution	$	0.00
	n. Class D Principal Distribution	$	0.00
	o. Total Deposits to Note Payment Account (sum a - n)	$	11,326,456.52
44.	Withdrawals
	a. Class A-1 Distribution	$	0.00
	b. Class A-2 Distribution	$	0.00
	c. Class A-3 Distribution	$	0.00
	d. Class A-4 Distribution	$	11,219,273.19
	e. Class B Distribution	$	31,350.00
	f. Class C Distribution	$	32,500.00
	g. Class D Distribution	$	43,333.33
	h. Total Withdrawals from Note Payment Account (sum a - g)	$	11,326,456.52



Certificate Payment Account Activity
45.	Deposits
	a. Excess Collections	$	662,628.08
	b. Reserve Account surplus (Ln 55)	$	1,646.28
	c. Total Deposits to Certificate Payment Account (sum a - b)	$	664,274.36
46.	Withdrawals
	a. Certificateholder Distribution	$	664,274.36
	b. Total Withdrawals from Certificate Payment Account	$	664,274.36
Required Reserve Account Amount
47.	Lesser of: (a or b)
	a. $2,500,000.02	$	2,500,000.02
	b. Note Balance	$	144,565,311.05
48.	Required Reserve Account Amount	$	2,500,000.02
Reserve Account Reconciliation
49.	Beginning Balance (as of end of preceding Distribution Date)	$	2,500,000.02
50.	Investment Earnings	$	1,646.28
51.	Reserve Account Draw Amount	$	0.00
52.	Reserve Account Amount (Ln 49 + Ln 50 - Ln 51)	$	2,501,646.30
53.	Deposit from Available Funds (Ln 42d)	$	0.00
54.	If Reserve Account Balance exceeds Required Reserve Account Amount, payment to
	a. the Note Payment Account for the payment of principal to the extent of any unfunded Regular Principal Distribution Amount; and	$	0.00
	b. any Successor Servicer for the payment of any unfunded Transition Costs and Additional Servicing Fee	$	0.00
55.	Payment to Certificateholder if Reserve Account Balance exceeds Required Reserve Account Amount and to the extent no unfunded amounts described in Ln 54 exist	$	1,646.28
56.	Ending Balance (Ln52 + Ln53 - Ln54 - Ln55)	$	2,500,000.02
57.	Reserve Account Deficiency (Ln48 - Ln56)	$	0.00
Instructions to the Trustee
58.	Amount to be deposited from the Reserve Account into the Collection Account	$	0.00
59.	Amount to be paid to Servicer from the Collection Account	$	133,903.88
60.	Amount to be paid to Backup Servicer from the Collection Account	$	2,500.00
61.	Amount to be deposited from the Collection Account into the Note Payment Account	$	11,326,456.52
62.	Amount to be deposited from the Collection Account into the Certificate Payment Account	$	662,628.08
63.	Amount to be deposited from the Collection Account into the Reserve Account	$	0.00
64.	Amount to be deposited from the Reserve Account, if Reserve Account Balance exceeds Required Reserve Account Amount, into
	a. the Note Payment Account for any unfunded Regular Principal Distributable Amount	$	0.00
	b. the Certificate Payment Account for payment to the Certificateholder, if no unfunded Regular Principal distributable amount exists	$	1,646.28
65.	Amount to be paid to Class A-1 Noteholders from the Note Payment Account	$	0.00
66.	Amount to be paid to Class A-2 Noteholders from the Note Payment Account	$	0.00
67.	Amount to be paid to Class A-3 Noteholders from the Note Payment Account	$	0.00
68.	Amount to be paid to Class A-4 Noteholders from the Note Payment Account	$	11,219,273.19
69.	Amount to be paid to Class B Noteholders from the Note Payment Account	$	31,350.00
70.	Amount to be paid to Class C Noteholders from the Note Payment Account	$	32,500.00
71.	Amount to be paid to Class D Noteholders from the Note Payment Account	$	43,333.33
72.	Amount to be paid to Certificateholders from the Certificate Payment Account with respect to Excess Collections and Reserve Account surplus	$	664,274.36



Delinquency Activity
		Number of Loans	Principal Balance
73.	Delinquency Analysis
	a. 31 to 60 days past due	636	$	5,957,907.91
	b. 61 to 90 days past due	253	$	2,447,118.52
	c. 91 to 120 days past due	68	$	535,556.48
	d. 121 or more days past due	2	$	17,757.79
	e. Total Past Due (sum a - d)	959	$	8,958,340.70
	f. Delinquent Loans as a percentage of end of period Pool Balance (Ln 73e / Ln 5)	%	5.9896		%

Current Collection Period Credit Loss Activity
		Number of Loans	Principal Balance

74.	Defaulted Receivables (charge-offs)	36	$	291,034.77
75.	Liquidation Proceeds (recoveries)	168	$	241,709.65
76.	Net Losses (Ln 74 - Ln 75)		$	49,325.12
77.	Ratio of Net Losses to Beginning of Period Pool Balance (Ln 76 / Ln 1)	%	0.0307		%

Cumulative Credit Loss Activity
		Number of Loans	Principal Balance

78.	Defaulted Receivables (charge-offs)	2,681	$	33,470,614.36
79.	Liquidation Proceeds (recoveries)	2,404	$	16,635,299.02
80.	Cumulative Net Losses (Ln 78 - Ln 79)		$	16,835,315.34
81.	Ratio of Cumulative Net Losses to Initial Pool Balance (Ln 80 / Ln 7)	%	1.6835		%
82.	Average Net Loss on Defaulted Receivables		$	6,279.49

Servicer Covenant
83.	CarMax, Inc Consolidated Tangible Net Worth as of the end of the Related Fiscal Quarter		$	3,099,903,000.00
84.	Is CarMax, Inc Consolidated Tangible Net Worth greater than $1,000,000,000?		Yes

IN WITNESS WHEREOF, the undersigned has duly executed this certificate on July 10, 2017.



CARMAX BUSINESS SERVICES, LLC

As Servicer

By:	/s/ Enrique Mayor-Mora

Name:	Enrique Mayor-Mora

Title:	Vice President and Treasurer

CarMax Auto Owner Trust 2013-4 10-D