Exhibit 99.1
MONTHLY SERVICER'S CERTIFICATE
CARMAX BUSINESS SERVICES, LLC
CARMAX AUTO OWNER TRUST
SERIES 2023-4
Collection Period07/01/25-07/31/25
Determination Date8/11/2025
Distribution Date8/15/2025
Additional information, including defined terms, can be found in the prospectus on the SEC's EDGAR system (http://www.sec.gov) under File No. 333-260819-08.




Pool Balance
1.Pool Balance on the close of the last day of the preceding Collection Period$726,902,224.29 
2.Collections allocable to Principal$27,916,698.27 
3.Purchase Amount allocable to Principal$0.00 
4.Defaulted Receivables$2,509,972.64 
5.Pool Balance on the close of the last day of the related Collection Period$696,475,553.38 
(Ln1 - Ln2 - Ln3 - Ln4)
6.Total number of Receivables outstanding on the close of the last day of the related Collection Period43,014 
7.Initial Pool Balance$1,518,987,901.90 
Beginning of PeriodEnd of Period
8.Note Balances
a. Class A-1 Note Balance
$0.00 $0.00 
b. Class A-2a Note Balance$6,707,437.79 $0.00 
c. Class A-2b Floating Rate Note Balance$6,707,437.73 $0.00 
d. Class A-3 Note Balance$480,000,000.00 $462,988,204.61 
e. Class A-4 Note Balance$90,700,000.00 $90,700,000.00 
f. Class B Note Balance$44,810,000.00 $44,810,000.00 
g. Class C Note Balance$42,530,000.00 $42,530,000.00 
h. Class D Note Balance$36,460,000.00 $36,460,000.00 
i. Note Balance (sum a - h)$707,914,875.52 $677,488,204.61 
9.Pool Factors
a. Class A-1 Note Pool Factor0.0000000 0.0000000 
b. Class A-2a Note Pool Factor0.0247279 0.0000000 
c. Class A-2b Floating Rate Note Pool Factor0.0247279 0.0000000 
d. Class A-3 Note Pool Factor1.0000000 0.9645588 
e. Class A-4 Note Pool Factor1.0000000 1.0000000 
f. Class B Note Pool Factor1.0000000 1.0000000 
g. Class C Note Pool Factor1.0000000 1.0000000 
h. Class D Note Pool Factor1.0000000 1.0000000 
i. Note Pool Factor0.4719433 0.4516588 
10.Overcollateralization Target Amount$18,987,348.77 
11.Current overcollateralization amount (Pool Balance - Note Balance)$18,987,348.77 
12.Weighted Average Coupon11.06 %
13.Weighted Average Original Termmonths65.83 
14.Weighted Average Remaining Termmonths40.03 
15.30 day Average SOFR for the accrual period ending 8/14/20254.33962 %
16.Note Rate applicable to the Class A-2b notes for the interest period ending 8/14/20255.13962 %
Collections
17.Finance Charges:
a. Collections allocable to Finance Charge$6,661,785.44 
b. Liquidation Proceeds allocable to Finance Charge$1,234.79 
c. Purchase Amount allocable to Finance Charge$0.00 
d. Available Finance Charge Collections (sum a - c)$6,663,020.23 
18.Principal:
a. Collections allocable to Principal$27,916,698.27 
b. Liquidation Proceeds allocable to Principal$1,095,409.90 
c. Purchase Amount allocable to Principal$0.00 
d. Available Principal Collections (sum a - c)$29,012,108.17 
19.Total Finance Charge and Principal Collections (17d + 18d)$35,675,128.40 
20.Interest Income from Collection Account$105,860.45 
21.Simple Interest Advances$0.00 
22.Available Collections (Ln19 + 20 + 21)$35,780,988.85 



Available Funds
23.Available Collections$35,780,988.85 
24.Reserve Account Draw Amount$0.00 
25.Available Funds$35,780,988.85 
Application of Available Funds
26.Servicing Fee0.15 %
a. Monthly Servicing Fee$605,751.85 
b. Amount Unpaid from Prior Months$0.00 
c. Amount Paid$605,751.85 
d. Shortfall Amount (a + b - c)$0.00 
27.Unreimbursed Servicer Advances$0.00 
28.Successor Servicer and Asset Representations Reviewer Unpaid Expenses and Indemnity Amounts
a. Successor Servicer Unpaid Transition Expenses and Indemnity Amounts (Capped at $175,000 annually)$0.00 
b. Successor Servicer Amount Paid$0.00 
c. Successor Servicer Shortfall Amount (a - b)$0.00 
d. Asset Representations Reviewer Fees, Expenses and Indemnity Amounts (Capped at $175,000 annually)$0.00 
e. Asset Representations Reviewer Amount Paid$0.00 
f. Asset Representations Reviewer Shortfall Amount (d - e)$0.00 
29.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-2a Monthly Interest$33,984.35 
f. Additional Note Interest related to Class A-2a Monthly Interest$0.00 
g. Interest Due on Additional Note Interest related to Class A-2a Monthly Interest$0.00 
h. Total Class A-2a Note Interest (sum e - g)$33,984.35 
i. Class A-2b Monthly Interest$29,685.67 
j. Additional Note Interest related to Class A-2b Monthly Interest$0.00 
k. Interest Due on Additional Note Interest related to Class A-2b Monthly Interest$0.00 
l. Total Class A-2b Note Interest (sum i - k)$29,685.67 
m. Class A-3 Monthly Interest$2,400,000.00 
n. Additional Note Interest related to Class A-3 Monthly Interest$0.00 
o. Interest Due on Additional Note Interest related to Class A-3 Monthly Interest$0.00 
p. Total Class A-3 Note Interest (sum m - o)$2,400,000.00 
q. Class A-4 Monthly Interest$450,476.67 
r. Additional Note Interest related to Class A-4 Monthly Interest$0.00 
r. Additional Note Interest related to Class A-4 Monthly Interest$0.00 
t. Total Class A-4 Note Interest (sum q - s)$450,476.67 
30.Priority Principal Distributable Amount$0.00 
31.Class B Noteholder Interest Amount
a. Class B Monthly Interest$238,613.25 
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)$238,613.25 
32.Secondary Principal Distributable Amount$0.00 
33.Class C Noteholder Interest Amount
a. Class C Monthly Interest$233,206.17 
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)$233,206.17 
34.Tertiary Principal Distributable Amount$0.00 
35.Class D Noteholder Interest Amount
a. Class D Monthly Interest$217,544.67 
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)$217,544.67 



36.Quaternary Principal Distributable Amount$11,439,322.14 
37.Required Payment Amount (Ln 26 + Ln 28 + (sum of Ln 29 through Ln 36))$15,648,584.77 
38.Reserve Account Deficiency$0.00 
39.Regular Principal Distributable Amount$18,987,348.77 
40.Remaining Unpaid Servicer Transition Expenses and Additional Servicing Fees, if any$0.00 
41.Remaining Unpaid Trustee and Asset Representations Reviewer Fees, Expenses and Indemnity Amounts, if any
a. Remaining Unpaid Trustee Fees, Expenses and Indemnity Amounts$0.00 
b. Remaining Unpaid Asset Representations Reviewer Fees, Expenses and Indemnity Amounts$0.00 
42.Remaining Unpaid Successor Servicer Indemnity Amounts, if any$0.00 
Collection Account Activity0.15 %
43.Deposits
a. Total Daily Deposits of Finance Charge Collections$6,663,020.23 
b. Total Daily Deposits of Principal Collections$29,012,108.17 
c. Withdrawal from Reserve Account$0.00 
d. Interest Income$105,860.45 
e. Total Deposits to Collection Account (sum a - d)$35,780,988.85 
44.Withdrawals
a. Servicing Fee and Unreimbursed Servicer Advances$605,751.85 
b. Successor Servicer Transition Expenses and Indemnity Amounts$0.00 
c. Deposit to Note Payment Account for Monthly Note Interest/Principal$34,030,181.69 
d. Deposit to Reserve Account$0.00 
e. Excess Collections (Deposit to Certificate Payment Account for payment to Certificateholder)$1,145,055.31 
f. Total Withdrawals from Collection Account (sum a - e)$35,780,988.85 
Note Payment Account Activity
45.Deposits
a. Class A-1 Interest Distribution$0.00 
b. Class A-2a Interest Distribution$33,984.35 
c. Class A-2b Interest Distribution$29,685.67 
d. Class A-3 Interest Distribution$2,400,000.00 
e. Class A-4 Interest Distribution$450,476.67 
f. Class B Interest Distribution$238,613.25 
g. Class C Interest Distribution$233,206.17 
h. Class D Interest Distribution$217,544.67 
i. Class A-1 Principal Distribution$0.00 
j. Class A-2a Principal Distribution$6,707,437.79 
k. Class A-2b Principal Distribution$6,707,437.73 
l. Class A-3 Principal Distribution$17,011,795.39 
m. Class A-4 Principal Distribution$0.00 
n. Class B Principal Distribution$0.00 
o. Class C Principal Distribution$0.00 
p. Class D Principal Distribution$0.00 
q. Total Deposits to Note Payment Account (sum a - p)$34,030,181.69 
46.Withdrawals
a. Class A-1 Distribution$0.00 
b. Class A-2a Distribution$6,741,422.14 
c. Class A-2b Distribution$6,737,123.40 
d. Class A-3 Distribution$19,411,795.39 
e. Class A-4 Distribution$450,476.67 
f. Class B Distribution$238,613.25 
g. Class C Distribution$233,206.17 
h. Class D Distribution$217,544.67 
i. Total Withdrawals from Note Payment Account (sum a - h)$34,030,181.69 



Certificate Payment Account Activity
47.Deposits to Certificate Payment Account from Excess Collections$1,145,055.31 
48.Withdrawals from Certificate Payment Account for Certificateholder Distribution$1,145,055.31 
Required Reserve Account Amount0.15 %
49.Required Reserve Account Amount (1.00% of Initial Pool Balance)$3,797,469.75 
Reserve Account Reconciliation
50.Beginning Balance (as of end of preceding Distribution Date)$3,797,469.75 
51.Investment Earnings$13,571.21 
52.Reserve Account Draw Amount$0.00 
53.Reserve Account Amount (Ln 50 + Ln 51 - Ln 52)$3,811,040.96 
54.Deposit from Available Funds (Ln 44d)$0.00 
55.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 
56.Payment to Depositor if Reserve Account Balance exceeds Required Reserve Account Amount and to the extent no unfunded amounts described in Ln 55 exist$13,571.21 
57.Ending Balance (Ln53 + Ln54 - Ln55 - Ln56)$3,797,469.75 
58.Reserve Account Deficiency (Ln50 - Ln57)$0.00 
Instructions to the Trustee
59.Amount to be deposited from the Reserve Account into the Collection Account$0.00 
60.Amount to be paid to Servicer from the Collection Account$605,751.85 
61.Amount to be deposited from the Collection Account into the Note Payment Account$34,030,181.69 
62.Amount to be deposited from the Collection Account into the Certificate Payment Account$1,145,055.31 
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 Depositor, if no unfunded Regular Principal distributable amount exists$13,571.21 
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-2a Noteholders from the Note Payment Account$6,741,422.14 
67.Amount to be paid to Class A-2b Noteholders from the Note Payment Account$6,737,123.40 
68.Amount to be paid to Class A-3 Noteholders from the Note Payment Account$19,411,795.39 
69.Amount to be paid to Class A-4 Noteholders from the Note Payment Account$450,476.67 
70.Amount to be paid to Class B Noteholders from the Note Payment Account$238,613.25 
71.Amount to be paid to Class C Noteholders from the Note Payment Account$233,206.17 
72.Amount to be paid to Class D Noteholders from the Note Payment Account$217,544.67 
73.Amount to be paid to Certificateholders from the Certificate Payment Account with respect to Excess Collections$1,145,055.31 



Delinquency Activity
Number of LoansPrincipal Balance
74.Delinquency Analysis
a. 31 to 60 days past due1,352$27,938,207.03 
b. 61 to 90 days past due630$13,425,576.45 
c. 91 to 120 days past due184$3,138,842.41 
d. 121 or more days past due1$5,396.57 
e. Total Past Due (sum a - d)2,167$44,508,022.46 
f. Delinquent Loans as a percentage of end of period Pool Balance (Ln 74e / Ln 5)6.3905 %
75.Has a Delinquency Trigger Event occurred?No
Loss Activity
Number of LoansPrincipal Balance
76.Defaulted Receivables (charge-offs)139$2,509,972.64 
77.Recoveries254$1,096,644.69 
78.Net Losses (Ln 76 - Ln 77)$1,413,327.95 
79.Ratio of Net Losses to Beginning of Period Pool Balance (Ln 78 / Ln 1)0.1944 %
Cumulative Loss Activity
Number of LoansPrincipal Balance
80.Defaulted Receivables (charge-offs)2,468$50,659,983.67 
81.Recoveries1,799$17,904,463.86 
82.Cumulative Net Losses (Ln 80 - Ln 81)$32,755,519.81 
83.Ratio of Cumulative Net Losses to Initial Pool Balance (Ln 82 / Ln 7)2.1564 %
84.Average Net Loss on Defaulted Receivables$13,272.09 
Other Servicing Information
85.Principal Balance of Receivables extended during the Collection Period$10,364,238.81 
86.Pool Balance on the close of the last day of the preceding Collection Period$726,902,224.29 
87.Ratio of extensions to pool balance (Ln 85 / Ln 86)1.43 %




IN WITNESS WHEREOF, the undersigned has duly executed this certificate on August 11, 2025
 
CARMAX BUSINESS SERVICES, LLC
 
As Servicer
By:/s/ Greg Dostich
Name:Greg Dostich
Title:Vice President and Treasurer