Exhibit 99.1
MONTHLY SERVICER'S CERTIFICATE
CARMAX BUSINESS SERVICES, LLC
CARMAX AUTO OWNER TRUST
SERIES 2026-3
Collection Period09/01/26-09/30/26
Determination Date10/9/2026
Distribution Date10/15/2026
Additional information, including defined terms, can be found in the prospectus on the SEC's EDGAR system (http://www.sec.gov) under File No. 333-288943-07.




Pool Balance
1.Pool Balance on the close of the last day of the preceding Collection Period$1,248,362,178.47 
2.Collections allocable to Principal$47,492,036.23 
3.Purchase Amount allocable to Principal$0.00 
4.Defaulted Receivables$201,047.98 
5.Pool Balance on the close of the last day of the related Collection Period$1,200,669,094.26 
(Ln1 - Ln2 - Ln3 - Ln4)
6.Total number of Receivables outstanding on the close of the last day of the related Collection Period72,664 
7.Initial Pool Balance$1,353,384,019.62 
Beginning of PeriodEnd of Period
8.Note Balances
a. Class A-1 Note Balance
$192,778,718.42 $145,085,634.21 
b. Class A-2 Note Balance$451,730,000.00 $451,730,000.00 
c. Class A-3 Note Balance$451,730,000.00 $451,730,000.00 
d. Class A-4 Note Balance$81,750,000.00 $81,750,000.00 
e. Class B Note Balance$23,680,000.00 $23,680,000.00 
f. Class C Note Balance$25,710,000.00 $25,710,000.00 
g. Class D Note Balance$17,600,000.00 $17,600,000.00 
h. Note Balance (sum a - g)$1,244,978,718.42 $1,197,285,634.21 
9.Pool Factors
a. Class A-1 Note Pool Factor0.6473429 0.4871915 
b. Class A-2 Note Pool Factor1.0000000 1.0000000 
c. Class A-3 Note Pool Factor1.0000000 1.0000000 
d. Class A-4 Note Pool Factor1.0000000 1.0000000 
e. Class B Note Pool Factor1.0000000 1.0000000 
f. Class C Note Pool Factor1.0000000 1.0000000 
g. Class D Note Pool Factor1.0000000 1.0000000 
h. Note Pool Factor0.9222065 0.8868782 
10.Overcollateralization Target Amount$3,383,460.05 
11.Current overcollateralization amount (Pool Balance - Note Balance)$3,383,460.05 
12.Weighted Average Coupon8.45 %
13.Weighted Average Original Termmonths67.24 
14.Weighted Average Remaining Termmonths57.26 
Collections
15.Finance Charges:
a. Collections allocable to Finance Charge$8,698,614.63 
b. Liquidation Proceeds allocable to Finance Charge$630.75 
c. Purchase Amount allocable to Finance Charge$0.00 
d. Available Finance Charge Collections (sum a - c)$8,699,245.38 
16.Principal:
a. Collections allocable to Principal$47,492,036.23 
b. Liquidation Proceeds allocable to Principal$73,552.42 
c. Purchase Amount allocable to Principal$0.00 
d. Available Principal Collections (sum a - c)$47,565,588.65 
17.Total Finance Charge and Principal Collections (15d + 16d)$56,264,834.03 
18.Interest Income from Collection Account$151,132.04 
19.Simple Interest Advances$0.00 
20.Available Collections (Ln17 + 18 + 19)$56,415,966.07 



Available Funds
21.Available Collections$56,415,966.07 
22.Reserve Account Draw Amount$0.00 
23.Available Funds$56,415,966.07 
Application of Available Funds
24.Servicing Fee0.15 %
a. Monthly Servicing Fee$1,040,301.82 
b. Amount Unpaid from Prior Months$0.00 
c. Amount Paid$1,040,301.82 
d. Shortfall Amount (a + b - c)$0.00 
25.Unreimbursed Servicer Advances$0.00 
26.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 
27.Class A Noteholder Interest Amounts
a. Class A-1 Monthly Interest$636,812.37 
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)$636,812.37 
e. Class A-2 Monthly Interest$1,641,285.67 
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)$1,641,285.67 
i. Class A-3 Monthly Interest$1,731,631.67 
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)$1,731,631.67 
m. Class A-4 Monthly Interest$318,143.75 
n. Additional Note Interest related to Class A-4 Monthly Interest$0.00 
o. Additional Note Interest related to Class A-4 Monthly Interest$0.00 
p. Total Class A-4 Note Interest (sum m - o)$318,143.75 
28.Priority Principal Distributable Amount$0.00 
29.Class B Noteholder Interest Amount
a. Class B Monthly Interest$96,101.33 
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)$96,101.33 
30.Secondary Principal Distributable Amount$999,624.16 
31.Class C Noteholder Interest Amount
a. Class C Monthly Interest$107,125.00 
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)$107,125.00 
32.Tertiary Principal Distributable Amount$25,710,000.00 
33.Class D Noteholder Interest Amount
a. Class D Monthly Interest$78,613.33 
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)$78,613.33 



34.Quaternary Principal Distributable Amount$17,600,000.00 
35.Required Payment Amount (Ln 24 + Ln 26 + (sum of Ln 27 through Ln 34))$49,959,639.10 
36.Reserve Account Deficiency$0.00 
37.Regular Principal Distributable Amount$3,383,460.05 
38.Remaining Unpaid Servicer Transition Expenses and Additional Servicing Fees, if any$0.00 
39.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 
40.Remaining Unpaid Successor Servicer Indemnity Amounts, if any$0.00 
Collection Account Activity0.15 %
41.Deposits
a. Total Daily Deposits of Finance Charge Collections$8,699,245.38 
b. Total Daily Deposits of Principal Collections$47,565,588.65 
c. Withdrawal from Reserve Account$0.00 
d. Interest Income$151,132.04 
e. Total Deposits to Collection Account (sum a - d)$56,415,966.07 
42.Withdrawals
a. Servicing Fee and Unreimbursed Servicer Advances$1,040,301.82 
b. Successor Servicer Transition Expenses and Indemnity Amounts$0.00 
c. Deposit to Note Payment Account for Monthly Note Interest/Principal$52,302,797.33 
d. Deposit to Reserve Account$0.00 
e. Excess Collections (Deposit to Certificate Payment Account for payment to Certificateholder)$3,072,866.92 
f. Total Withdrawals from Collection Account (sum a - e)$56,415,966.07 
Note Payment Account Activity
43.Deposits
a. Class A-1 Interest Distribution$636,812.37 
b. Class A-2 Interest Distribution$1,641,285.67 
c. Class A-3 Interest Distribution$1,731,631.67 
d. Class A-4 Interest Distribution$318,143.75 
e. Class B Interest Distribution$96,101.33 
f. Class C Interest Distribution$107,125.00 
g. Class D Interest Distribution$78,613.33 
h. Class A-1 Principal Distribution$47,693,084.21 
i. Class A-2 Principal Distribution$0.00 
j. Class A-3 Principal Distribution$0.00 
k. Class A-4 Principal Distribution$0.00 
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)$52,302,797.33 
44.Withdrawals
a. Class A-1 Distribution$48,329,896.58 
b. Class A-2 Distribution$1,641,285.67 
c. Class A-3 Distribution$1,731,631.67 
d. Class A-4 Distribution$318,143.75 
e. Class B Distribution$96,101.33 
f. Class C Distribution$107,125.00 
g. Class D Distribution$78,613.33 
h. Total Withdrawals from Note Payment Account (sum a - g)$52,302,797.33 



Certificate Payment Account Activity
45.Deposits to Certificate Payment Account from Excess Collections$3,072,866.92 
46.Withdrawals from Certificate Payment Account for Certificateholder Distribution$3,072,866.92 
Required Reserve Account Amount0.15 %
47.Required Reserve Account Amount (1.00% of Initial Pool Balance)$3,383,460.05 
Reserve Account Reconciliation
48.Beginning Balance (as of end of preceding Distribution Date)$3,383,460.05 
49.Investment Earnings$10,136.81 
50.Reserve Account Draw Amount$0.00 
51.Reserve Account Amount (Ln 48 + Ln49 - Ln 50)$3,393,596.86 
52.Deposit from Available Funds (Ln 42d)$0.00 
53.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 
54.Payment to Depositor if Reserve Account Balance exceeds Required Reserve Account Amount and to the extent no unfunded amounts described in Ln 55 exist$10,136.81 
55.Ending Balance (Ln51 + Ln52 - Ln53 - Ln54)$3,383,460.05 
56.Reserve Account Deficiency (Ln48 - Ln55)$0.00 
Instructions to the Trustee
57.Amount to be deposited from the Reserve Account into the Collection Account$0.00 
58.Amount to be paid to Servicer from the Collection Account$1,040,301.82 
59.Amount to be deposited from the Collection Account into the Note Payment Account$52,302,797.33 
60.Amount to be deposited from the Collection Account into the Certificate Payment Account$3,072,866.92 
61.Amount to be deposited from the Collection Account into the Reserve Account$0.00 
62.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$10,136.81 
63.Amount to be paid to Class A-1 Noteholders from the Note Payment Account$48,329,896.58 
64.Amount to be paid to Class A-2 Noteholders from the Note Payment Account$1,641,285.67 
65.Amount to be paid to Class A-3 Noteholders from the Note Payment Account$1,731,631.67 
66.Amount to be paid to Class A-4 Noteholders from the Note Payment Account$318,143.75 
67.Amount to be paid to Class B Noteholders from the Note Payment Account$96,101.33 
68.Amount to be paid to Class C Noteholders from the Note Payment Account$107,125.00 
69.Amount to be paid to Class D Noteholders from the Note Payment Account$78,613.33 
70.Amount to be paid to Certificateholders from the Certificate Payment Account with respect to Excess Collections$3,072,866.92 



Delinquency Activity
Number of LoansPrincipal Balance
71.Delinquency Analysis
a. 31 to 60 days past due432$5,490,178.93 
b. 61 to 90 days past due184$2,693,401.60 
c. 91 to 120 days past due52$971,072.52 
d. 121 or more days past due0$0.00 
e. Total Past Due (sum a - d)668$9,154,653.05 
f. Delinquent Loans as a percentage of end of period Pool Balance (Ln 71e / Ln 5)0.7625 %
72.Has a Delinquency Trigger Event occurred?No
Loss Activity
Number of LoansPrincipal Balance
73.Defaulted Receivables (charge-offs)11$201,047.98 
74.Recoveries8$74,183.17 
75.Net Losses (Ln 73 - Ln 74)$126,864.81 
76.Ratio of Net Losses to Beginning of Period Pool Balance (Ln 75 / Ln 1)0.0102 %
Cumulative Loss Activity
Number of LoansPrincipal Balance
77.Defaulted Receivables (charge-offs)16$350,933.46 
78.Recoveries11$201,283.17 
79.Cumulative Net Losses (Ln 77 - Ln 78)$149,650.29 
80.Ratio of Cumulative Net Losses to Initial Pool Balance (Ln 79 / Ln 7)0.0111 %
81.Average Net Loss on Defaulted Receivables$9,353.14 
Other Servicing Information
82.Principal Balance of Receivables extended during the Collection Period$1,262,692.95 
83.Pool Balance on the close of the last day of the preceding Collection Period$1,248,362,178.47 
84.Ratio of extensions to pool balance (Ln 82 / Ln 83)0.10 %




IN WITNESS WHEREOF, the undersigned has duly executed this certificate on October 09, 2026
 
CARMAX BUSINESS SERVICES, LLC
As Servicer
By:/s/ Greg Dostich
Name:Greg Dostich
Title:Vice President and Treasurer