Exhibit 99.1

SERVICER’S CERTIFICATE

AMERICAN HONDA FINANCE CORPORATION


MONTHLY SERVICER REPORT -- Honda Auto Receivables 2021-4 Owner Trust
Collection Period: January 1, 2025 through January 31, 2025


Deal Age	39	Determination Date: 02/18/2025
Actual/360 Days	31	Record Date: 02/20/2025
30/360 Days	30	Payment Date: 02/21/2025

ORIGINAL DEAL PARAMETERS


	Dollar Amount		Number of Receivables
Total Portfolio Balance	$	1,619,491,676.76		85,623


	Accrual Basis	Dollar Amount		% of Pool			Interest Rate			Final Scheduled Maturity Date
Class A-1 Notes	Actual/360	$	315,000,000.00		19.45	%		0.143	%	November 21, 2022
Class A-2 Notes	30/360	$	574,300,000.00		35.46	%		0.390	%	May 21, 2024
Class A-3 Notes	30/360	$	574,300,000.00		35.46	%		0.880	%	January 21, 2026
Class A-4 Notes	30/360	$	115,348,000.00		7.12	%		1.140	%	June 21, 2028
Certificates	30/360	$	40,543,676.76		2.50	%		0.000	%
Total Securities Balance		$	1,619,491,676.76
Total Note Balance		$	1,578,948,000.00

Reserve Account Initial Deposit		$	4,048,729.19
Yield Supplement Account Deposit		$	56,090,072.69

COLLECTIONS


Interest Collections
Simple Interest Collections	$	450,973.28
Interest Related to Repurchased Receivables	$	0.00
Interest Advance for simple Interest - Net *	$	0.00
Total Interest Collections	$	450,973.28


* Advances are reimbursed (including outstanding advances of $0.00):
(i) from subsequent payments, liquidation proceeds and servicer repurchase payments in respect of the related obligor, and
(ii) to the extent amounts in clause (i) are insufficient, generally from interest (with respect to interest advances).


Principal Collections
Principal Collections	$	16,778,739.93
Prepayments in Full	$	3,714,040.56
Liquidation Proceeds	$	81,157.26
Principal Related to Repurchased Receivables	$	0.00
Recoveries from Prior Month Charge Offs	$	60,877.89
Total Principal Collections	$	20,634,815.64

Total Interest and Principal Collections	$	21,085,788.92
Yield Supplement Deposit	$	381,634.37
Collection Account Investment Earnings	$	0.00

Total Available Amount	$	21,467,423.29

SERVICER’S CERTIFICATE

AMERICAN HONDA FINANCE CORPORATION


MONTHLY SERVICER REPORT -- Honda Auto Receivables 2021-4 Owner Trust
Collection Period: January 1, 2025 through January 31, 2025


Deal Age	39	Determination Date: 02/18/2025
Actual/360 Days	31	Record Date: 02/20/2025
30/360 Days	30	Payment Date: 02/21/2025

DISTRIBUTIONS


Note Percentage	100.00	%
Certificate Percentage	0.00	%	Amount Due		Amount Paid		Shortfall
Total Servicing Fee	1.00	%	$	187,692.08	$	187,692.08	$	0.00
Trustee Fees			$	0.00	$	0.00	$	0.00
Asset Representations Reviewer Fees (Accrued & Unpaid)					$	0.00

Interest - Class A-1 Notes			$	0.00	$	0.00	$	0.00
Interest - Class A-2 Notes			$	0.00	$	0.00	$	0.00
Interest - Class A-3 Notes			$	50,848.47	$	50,848.47	$	0.00
Interest - Class A-4 Notes			$	109,580.60	$	109,580.60	$	0.00
Total Monthly Interest			$	160,429.07	$	160,429.07	$	0.00

Principal - Class A-1 Notes			$	0.00	$	0.00	$	0.00
Principal - Class A-2 Notes			$	0.00	$	0.00	$	0.00
Principal - Class A-3 Notes			$	20,622,429.49	$	20,622,429.49	$	0.00
Principal - Class A-4 Notes			$	0.00	$	0.00	$	0.00
Total Monthly Principal			$	20,622,429.49	$	20,622,429.49	$	0.00

Interest - Certificates			$	0.00	$	0.00	$	0.00
Principal - Certificates			$	0.00	$	0.00	$	0.00


	Available to Deposit		Reserve Deposit		Reserve Draw		Excess Released		Released to Seller
Reserve Account Deposit	$	496,872.65	$	0.00	$	0.00	$	0.00	$	496,872.65


Noteholder/Certificateholder Distributions (Per $1000 of Original Principal Amount)	Fee		Interest		Interest Shortfall		Principal		Principal Shortfall		Amount Distributed
Servicing Fee	$	0.12									$	187,692.08
Trustee Fees											$	0.00
Asset Representation Reviewer Fees											$	0.00
Class A-1 Notes			$	0.00	$	0.00	$	0.00	$	0.00	$	0.00
Class A-2 Notes			$	0.00	$	0.00	$	0.00	$	0.00	$	0.00
Class A-3 Notes			$	0.09	$	0.00	$	35.91	$	0.00	$	20,673,277.96
Class A-4 Notes			$	0.95	$	0.00	$	0.00	$	0.00	$	109,580.60
Certificates			$	0.00	$	0.00	$	0.00	$	0.00	$	0.00

SERVICER’S CERTIFICATE

AMERICAN HONDA FINANCE CORPORATION


MONTHLY SERVICER REPORT -- Honda Auto Receivables 2021-4 Owner Trust
Collection Period: January 1, 2025 through January 31, 2025


Deal Age	39	Determination Date: 02/18/2025
Actual/360 Days	31	Record Date: 02/20/2025
30/360 Days	30	Payment Date: 02/21/2025

POOL DATA


	Proceeding Month
	Carryover Shortfall				Beginning of Period				End of Period
	Interest		Principal		Balance		Note Factor		Balance		Note Factor
Class A-1 Notes	$	0.00	$	0.00	$	0.00		0.0000000	$	0.00		0.0000000
Class A-2 Notes	$	0.00	$	0.00	$	0.00		0.0000000	$	0.00		0.0000000
Class A-3 Notes	$	0.00	$	0.00	$	69,338,820.72		0.1207362	$	48,716,391.23		0.0848274
Class A-4 Notes	$	0.00	$	0.00	$	115,348,000.00		1.0000000	$	115,348,000.00		1.0000000
Certificates	$	0.00	$	0.00	$	40,543,676.76		1.0000000	$	40,543,676.76		1.0000000
Total Securities					$	225,230,497.48		0.1390748	$	204,608,067.99		0.1263409
Total Notes					$	184,686,820.72		0.1169683	$	164,064,391.23		0.1039074


Portfolio Information	Original			Prior Month			Current Month
Weighted Average Coupon (WAC)		2.53	%		2.32	%		2.32	%
Weighted Average Remaining Maturity (WAM)		48.66			15.83			15.00
Weighted Average Original Maturity (WAOM)		60.41
Remaining Number of Receivables		85,623			36,317			35,067
Portfolio Receivable Balance	$	1,619,491,676.76		$	225,230,497.48		$	204,608,067.99

DELINQUENCY AND NET LOSS ACTIVITY


Net Loss and Delinquency Account Activity	Amount
Gross Principal Balance on Defaulted Receivables	$	129,649.00
Liquidation Proceeds	$	81,157.26
Recoveries on Previously Defaulted Contracts	$	60,877.89
Aggregate Net Losses for Collection Period	$	(12,386.15	)
Net Loss Rate for Collection Period's Average Balance (annualized)		-0.07	%
Cumulative Net Losses for all Periods	$	2,410,000.96


Delinquent Receivables	# Units		% Unit			Dollar Amount		% Dollar
31-60 Days Delinquent		205		0.58	%	$	1,503,652.23		0.73	%
61-90 Days Delinquent		65		0.19	%	$	495,198.68		0.24	%
91-120 Days Delinquent		14		0.04	%	$	68,680.78		0.03	%
121 Days or More Delinquent		0		0.00	%	$	0.00		0.00	%


Repossession Activity	# Units		% Unit			Dollar Amount		% Dollar
Vehicles Repossessed During Collection Period		6		0.02	%	$	50,080.22		0.02	%
Total Accumulated Repossessed Vehicles in Inventory		12		0.03	%	$	116,098.85		0.06	%

SERVICER’S CERTIFICATE

AMERICAN HONDA FINANCE CORPORATION


MONTHLY SERVICER REPORT -- Honda Auto Receivables 2021-4 Owner Trust
Collection Period: January 1, 2025 through January 31, 2025


Deal Age	39	Determination Date: 02/18/2025
Actual/360 Days	31	Record Date: 02/20/2025
30/360 Days	30	Payment Date: 02/21/2025

DELINQUENCY AND NET LOSS ACTIVITY


Net Loss and Delinquency Ratios
Ratio of Net Losses to the Pool Balance as of Each Collection Period
Third Preceding Collection Period	0.11	%
Second Preceding Collection Period	0.19	%
Preceding Collection Period	0.05	%
Current Collection Period	-0.07	%
Four Month Average	0.07	%
Ratio of Number of Contracts Delinquent 61 Days or More to the Outstanding Number of Receivables (includes repossessions in inventory)
Second Preceding Collection Period	0.25	%
Preceding Collection Period	0.26	%
Current Collection Period	0.26	%
Three Month Average	0.26	%


Delinquency Trigger	4.80%	Delinquency Percentage exceeds Delinquency Trigger:	No
Delinquency Percentage -	0.28%
Receivables that are 61 days or more delinquent as a percentage of Current Outstanding Balance of Receivables

LOSS AND CUMULATIVE LOSS INFORMATION


	Current Month					Cumulative
For Assets Experiencing a Loss:	Units		Amount			Units		Amount
Gross Principal on Defaulted Receivables		14	$	108,901.98			427	$	5,919,757.45
Liquidation Proceeds and Recoveries on Defaulted Receivables		28	$	118,914.36			349	$	3,461,832.15
Net Loss Amount		14	$	(10,012.38	)		427	$	2,457,925.30
Net Loss % of Average Portfolio Balance (Annualized)				-0.06	%
Cumulative Net Loss % of Initial Balance									0.15	%
Average Net Loss of Assets Experiencing a Loss								$	5,756.27

CREDIT ENHANCEMENT


Reconciliation of Reserve Account				Reconciliation of Yield Supplement Account
Beginning Reserve Account Balance	$	4,048,729.19		Beginning Yield Supplement Account Balance	$	2,613,571.90
Investment Earnings	$	14,626.86		Investment Earnings	$	10,199.16
Excess Interest Deposited into the Reserve Account	$	0.00		Additional Yield Supplement Amounts	$	0.00
Investment Withdrawal to Seller	$	(14,626.86	)	Yield Supplement Withdrawal Amount	$	381,634.37
Release of Reserve to Collection Account	$	0.00		Investment Earnings Withdraw	$	0.00
Release of Reserve to Seller	$	0.00		Release of Yield Supplement Account Balance to Seller	$	0.00
Ending Reserve Account Balance	$	4,048,729.19		Ending Yield Supplement Account Balance	$	2,242,136.69

Reserve Account Required Amount	$	4,048,729.19

SERVICER’S CERTIFICATE

AMERICAN HONDA FINANCE CORPORATION


MONTHLY SERVICER REPORT -- Honda Auto Receivables 2021-4 Owner Trust
Collection Period: January 1, 2025 through January 31, 2025


Deal Age	39	Determination Date: 02/18/2025
Actual/360 Days	31	Record Date: 02/20/2025
30/360 Days	30	Payment Date: 02/21/2025

REPURCHASE DEMAND ACTIVITY (RULE 15Ga-1)


Is there any activity to report?								No

STATEMENT TO NOTEHOLDERS


Has there been a material change in practices with respect to charge-offs, collection and management of delinquent receivables, and the effect of any grace period, re-aging, re-structuring, partial payments or other practices on delinquency and loss experience?								No

Have there been any material modifications, extensions or waivers to receivables terms, fees, penalties or payments during the collection period?								No

Have there been any material breaches of representations, warranties or covenants contained in the receivables?								No

Has there been an issuance of notes or other securities backed by the receivables?								No

Has there been a material change in the underwriting, origination or acquisition of receivables?								No

SERVICER CERTIFICATION


I hereby certify that the servicing report provided is true and accurate to the best of my knowledge.

/s/ Paul C. Honda
Paul C. Honda
Vice President-Finance & Administration and Assistant Secretary

Honda Auto Receivables 2021-4 Owner Trust 10-D