Exhibit 99.1
GM Financial Automobile Leasing Trust 2026-3
4.830% Exchange Note
Class A-1 4.00200% Asset Backed Notes
Class A-2A 4.33% Asset Backed Notes
Class A-2B Floating Rate Asset Backed Notes
Class A-3 4.53% Asset Backed Notes
Class A-4 4.62% Asset Backed Notes
Class B 4.71% Asset Backed Notes
Class C 4.82% Asset Backed Notes
Servicer’s Certificate
| Beginning of Period: | 09/01/26 | ||||
| End of Period: | 09/30/26 | ||||
| Number of days in Interest Period (Actual/360): | 29 | ||||
| Number of days in Collection Period: | 30 | ||||
| Report Due Date: | 10/16/26 | ||||
| Distribution Date: | 10/20/26 | ||||
| Transaction Month: | 2 |
| 2026-3 | Original Agg. | |||||||||||
| Designated Pool | Units | Start Date | Closing Date | Securitization Value | ||||||||
| 31,879 | 07/01/2026 | 08/13/2026 | $ | 1,111,652,923 | ||||||||
| Total | 31,879 | $ | 1,111,652,923 | |||||||||
RECONCILIATION OF 2026-3 DESIGNATED POOL AGGREGATE SECURITIZATION VALUE
| {1} | Beginning of period Aggregate Securitization Value | {1} | $ | 1,080,070,440 | ||||||||
| {2} | Reduction in Agg. Securitization Value due to payments | {2} | 8,998,670 | |||||||||
| {3} | Reduction in Agg. Securitization Value due to Defaulted Leases | {3} | 1,366,253 | |||||||||
| {4} | Reduction in Agg. Securitization Value due to early terminations, dealer buyouts, cancellations, repurchases | {4} | 5,695,559 | |||||||||
| {5} | Other adjustments | {5} | 0 | |||||||||
| {6} | Total change in Agg. Securitization Value | {6} | 16,060,482 | |||||||||
| {7} | End of period Aggregate Securitization Value | {7} | $ | 1,064,009,958 | ||||||||
| {8} | Pool Factor | {8} | 95.714223 | % | ||||||||
RECONCILIATION OF 2026-3 EXCHANGE NOTE
| {9} | Original Exchange Note Balance | {9} | $ | 1,060,000,000 | ||||
| {10} | Beginning of period Exchange Note Balance | {10} | $ | 1,028,417,517 | ||||
| {11} | Exchange Note Principal Payment Amount | {11} | 16,060,482 | |||||
| {12} | End of period Exchange Note Balance | {12} | $ | 1,012,357,035 | ||||
| {13} | Note Pool Factor | {13} | 95.505381 | % |
1
RECONCILIATION OF THE ASSET BACKED NOTES
| Class A-1 | Class A-2A | Class A-2B | Class A-3 | Class A-4 | ||||||||||||||||||||
| {14} | Original Note Balance | {14} | $ | 137,220,000 | $ | 295,000,000 | $ | 90,220,000 | $ | 315,180,000 | $ | 67,860,000 | ||||||||||||
| {15} | Beginning of period Note Balance | {15} | $ | 94,478,619 | $ | 295,000,000 | $ | 90,220,000 | $ | 315,180,000 | $ | 67,860,000 | ||||||||||||
| {16} | Noteholders’ Principal Distributable Amount | {16} | 16,060,482 | 0 | 0 | 0 | 0 | |||||||||||||||||
| {17} | Noteholders’ Accelerated Principal Amount | {17} | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||
| {18} | Aggregate Principal Parity Amount | {18} | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||
| {19} | Matured Principal Shortfall | {19} | 0 | 0 | 0 | 0 | 0 | |||||||||||||||||
| {20} | End of period Note Balance | {20} | $ | 78,418,137 | $ | 295,000,000 | $ | 90,220,000 | $ | 315,180,000 | $ | 67,860,000 | ||||||||||||
| {21} | Note Pool Factor | {21} | 57.147746 | % | 100.000000 | % | 100.000000 | % | 100.0000000 | % | 100.000000 | % | ||||||||||||
| Class B | Class C | TOTAL | ||||||||||||||
| {22} | Original Note Balance | {22} | $ | 49,450,000 | $ | 45,600,000 | $ | 1,000,530,000 | ||||||||
| {23} | Beginning of period Note Balance | {23} | $ | 49,450,000 | $ | 45,600,000 | $ | 957,788,619 | ||||||||
| {24} | Noteholders’ Principal Distributable Amount | {24} | 0 | 0 | 16,060,482 | |||||||||||
| {25} | Noteholders’ Accelerated Principal Amount | {25} | 0 | 0 | 0 | |||||||||||
| {26} | Aggregate Principal Parity Amount | {26} | 0 | 0 | 0 | |||||||||||
| {27} | Matured Principal Shortfall | {27} | 0 | 0 | 0 | |||||||||||
| {28} | End of period Note Balance | {28} | $ | 49,450,000 | $ | 45,600,000 | $ | 941,728,137 | ||||||||
| {29} | Note Pool Factor | {29} | 100.000000 | % | 100.000000 | % | 94.122929 | % | ||||||||
EXCHANGE NOTE MONTHLY PRINCIPAL PAYMENT AND INTEREST CALCULATIONS
Principal payment calculation:
| {30} | Beginning of period Designated Pool Balance | {30} | $ | 1,080,070,440 | ||||||||
| {31} | Ending Designated Pool Balance | {31} | 1,064,009,958 | |||||||||
| {32} | Unpaid prior Exchange Note Principal Payment Amount | {32} | 0 | |||||||||
| {33} | Sum of {31} + {32} | {33} | 1,064,009,958 | |||||||||
| {34} | Exchange Note Principal Payment Amount {30} - {33} | {34} | $ | 16,060,482 |
Interest calculation:
| Beg Note Balance | Interest Carryover | Interest Rate | Days | Days Basis | Interest | |||||||||||||||||||
| {35} | $ | 1,028,417,517 | $ | 0 | 4.830 | % | 30 | 30/360 | $ | 4,139,381 | ||||||||||||||
2
RECONCILIATION OF EXCHANGE NOTE COLLECTION ACCOUNT
Additions:
| {36} | 2026-3 Designated Pool Collections (net of Liquidation Proceeds and fees) | {36} | $ | 17,904,216 | ||||||||
| {37} | Net Liquidation Proceeds collected during period | {37} | 7,646,209 | |||||||||
| {38} | Investment Earnings | {38} | 118,438 | |||||||||
| {39} | Investment Earnings - transferred to Indenture Note Collection Account | {39} | (118,438 | ) | ||||||||
| {40} | Deposit from Servicer | {40} | 0 | |||||||||
| {41} | Total Additions: | {41} | 25,550,425 |
Distributions:
| {42} | To the Servicer, Designated Pool Servicing Fee | {42} | 900,059 | |||||||||
| {43} | To the 2026-3 Exchange Noteholder, the Exchange Note Interest Payment Amount | {43} | 4,139,381 | |||||||||
| {44} | To the 2026-3 Exchange Noteholder, the Exchange Note Principal Payment Amount | {44} | 16,060,482 | |||||||||
| {45} | To the 2026-3 Exchange Noteholder, any funds available to pay obligations pursuant to Indenture Section 8.3 (a)(i) through (xiv) | {45} | 0 | |||||||||
| {46} | To the 2026-3 Exchange Noteholder, all remaining funds to be applied as Excess Exchange Note Payments | {46} | 4,450,503 | |||||||||
| {47} | Total Distributions: | {47} | $ | 25,550,425 |
NOTEHOLDERS’ MONTHLY PRINCIPAL PAYMENT AND INTEREST CALCULATIONS
Noteholders’ Principal Distributable calculation:
| {48} | Beginning Agg. Securitization Value | {48} | $ | 1,080,070,440 | ||||||||||||||||
| {49} | Ending Agg. Securitization Value | {49} | 1,064,009,958 | |||||||||||||||||
| {50} | Principal Distributable Amount {48} - {49} | {50} | 16,060,482 | |||||||||||||||||
| {51} | Noteholders’ Principal Carryover Amount | {51} | 0 | |||||||||||||||||
| {52} | Principal Distributable Amount + Noteholders’ Principal Carryover Amount | {52} | 16,060,482 | |||||||||||||||||
| {53} | Amount required to reduce Outstanding Amount after giving effect to distributions made pursuant to Indenture Section 8.3 (a) (i) through (x) to the Required Pro Forma Note Balance | {53} | 16,060,482 | |||||||||||||||||
| {54} | Noteholders’ Principal Distributable Amount Lesser of {52} and {53} | {54} | $ | 16,060,482 |
Noteholders’ Interest Distributable calculation:
| Class | Beg Note Balance | Interest Carryover | Interest Rate | Days | Days Basis | Interest | ||||||||||||||||||
| {55} | Class A-1 | $ | 94,478,619 | $ | 0 | 4.00200 | % | 29 | Actual/360 | $ | 304,584 | |||||||||||||
| {56} | Class A-2A | $ | 295,000,000 | 0 | 4.33 | % | 30 | 30/360 | 1,064,459 | |||||||||||||||
| {57} | Class A-2B | $ | 90,220,000 | 0 | 3.99783 | % | 29 | Actual/360 | 290,552 | |||||||||||||||
| {58} | Class A-3 | $ | 315,180,000 | 0 | 4.53 | % | 30 | 30/360 | 1,189,805 | |||||||||||||||
| {59} | Class A-4 | $ | 67,860,000 | 0 | 4.62 | % | 30 | 30/360 | 261,261 | |||||||||||||||
| {60} | Class B | $ | 49,450,000 | 0 | 4.71 | % | 30 | 30/360 | 194,092 | |||||||||||||||
| {61} | Class C | $ | 45,600,000 | 0 | 4.82 | % | 30 | 30/360 | 183,160 | |||||||||||||||
3
RECONCILIATION OF INDENTURE COLLECTION ACCOUNT
Available Funds:
| {62} | 2026-3 Exchange Note Collections | {62} | $ | 24,650,366 | ||||||||
| {63} | Investment Earnings | {63} | 0 | |||||||||
| {64} | Investment Earnings - transferred from Exchange Note Collection Account | {64} | 118,438 | |||||||||
| {65} | Investment Earnings - and amounts released from Reserve Account pursuant to Section 2.14(b)(ii) of Servicing Supplement | {65} | 8,415 | |||||||||
| {66} | Optional Purchase Price | {66} | 0 | |||||||||
| {67} | Indenture Section 5.4 disposition of Collateral | {67} | 0 | |||||||||
| {68} | Available Funds: | {68} | 24,777,219 | |||||||||
| {69} | Reserve Account Withdrawal Amount | {69} | 0 | |||||||||
| {70} | Total Distributable Funds: | {70} | 24,777,219 |
Distributions:
| {71} | To the Successor Servicer, unpaid transition expenses, pro rata | {71} | 0 | |||||||||
| {72} | To the Indenture Trustee, any accrued and unpaid fees & expenses, pro rata | {72} | 417 | |||||||||
| {73} | To the Issuer Owner Trustee, any accrued and unpaid fees & expenses, pro rata | {73} | 250 | |||||||||
| {74} | To the Asset Representations Reviewer, any accrued and unpaid fees & expenses, pro rata | {74} | 0 | |||||||||
| {75} | Class A-1 Noteholders’ Interest Distributable Amount pari passu | {75} | 304,584 | |||||||||
| {76} | Class A-2A Noteholders’ Interest Distributable Amount pari passu | {76} | 1,064,459 | |||||||||
| {77} | Class A-2B Noteholders’ Interest Distributable Amount pari passu | {77} | 290,552 | |||||||||
| {78} | Class A-3 Noteholders’ Interest Distributable Amount pari passu | {78} | 1,189,805 | |||||||||
| {79} | Class A-4 Noteholders’ Interest Distributable Amount pari passu | {79} | 261,261 | |||||||||
| {80} | Class A Noteholders’ Principal Parity Amount or Matured Principal Shortfall | {80} | 0 | |||||||||
| {81} | Class B Noteholders’ Interest Distributable Amount | {81} | 194,092 | |||||||||
| {82} | Class B Noteholders’ Principal Parity Amount or Matured Principal Shortfall | {82} | 0 | |||||||||
| {83} | Class C Noteholders’ Interest Distributable Amount | {83} | 183,160 | |||||||||
| {84} | Class C Noteholders’ Principal Parity Amount or Matured Principal Shortfall | {84} | 0 | |||||||||
| {85} | Noteholders’ Principal Distributable Amount | {85} | 16,060,482 | |||||||||
| {86} | To the Reserve Account, the Reserve Account Required Amount | {86} | 0 | |||||||||
| {87} | To the Noteholders, the Accelerated Principal Amount (as calculated below) | {87} | 0 | |||||||||
| {88} | To the Successor Servicer, any amounts in excess of the caps set forth, pro rata | {88} | 0 | |||||||||
| {89} | To the Indenture Trustee, any amounts in excess of the caps set forth, pro rata | {89} | 0 | |||||||||
| {90} | To the Asset Representations Reviewer, any amounts in excess of the caps set forth, pro rata | {90} | 0 | |||||||||
| {91} | To the Issuer Owner Trustee, any amounts in excess of the caps set forth, pro rata | {91} | 0 | |||||||||
| {92} | To the Issuer Trust Certificateholders, the aggregate amount remaining | {92} | 5,228,157 | |||||||||
| {93} | Total Distributions: | {93} | $ | 24,777,219 |
4
PRINCIPAL PARITY AMOUNT CALCULATION
| Class | (X) Cumulative Note Balance | (Y) Aggregate Securitization Value | (I) Excess of (X) - (Y) | (II) Total Available Funds in Indenture Collection Account | Lesser of (I) or (II) | |||||||||||||||||
| {94} | Class A | $ | 862,738,619 | $ | 1,064,009,958 | $ | 0 | $ | 21,665,891 | $ | 0 | |||||||||||
| {95} | Class B | 912,188,619 | 1,064,009,958 | 0 | 21,471,799 | 0 | ||||||||||||||||
| {96} | Class C | 957,788,619 | 1,064,009,958 | 0 | 21,288,639 | 0 | ||||||||||||||||
ACCELERATED PRINCIPAL AMOUNT CALCULATION
| {97} | Excess Total Available Funds | {97} | $ | 5,228,157 | ||||||||||||||||
| {98} | Beginning Note Balance | {98} | 957,788,619 | |||||||||||||||||
| {99} | Principal payments through Indenture Section 8.3 (a) (i) through (xii) | {99} | 16,060,482 | |||||||||||||||||
| {100} | Pro-Forma Note Balance | {100} | 941,728,137 | |||||||||||||||||
| {101} | Ending Aggregate Securitization Value | {101} | 1,064,009,958 | |||||||||||||||||
| {102} | 11.0% of Aggregate Securitization Value as of Cutoff until Class A-2 is paid in full, 10.5% Thereafter ($122,281,821) | {102} | 122,281,821 | |||||||||||||||||
| {103} | Required Pro Forma Note Balance {101} - {102} | {103} | 941,728,137 | |||||||||||||||||
| {104} | Excess of Pro Forma Balance minus Required Pro Forma Balance {100} - {103} | {104} | 0 | |||||||||||||||||
| {105} | Lesser of Excess Total Available Funds and Excess of Pro Forma Note Balance | {105} | $ | 0 |
OVERCOLLATERALIZATION CALCULATIONS
Exchange Note:
| {106} | Ending Aggregate Securitization Value | {106} | $ | 1,064,009,958 | ||||||||
| {107} | End of Period Note Balance | {107} | 1,012,357,035 | |||||||||
| {108} | Overcollateralization | {108} | 51,652,923 | |||||||||
| {109} | Overcollateralization % | {109} | 4.85 | % |
Asset Backed Notes:
| {110} | Ending Aggregate Securitization Value | {110} | 1,064,009,958 | |||||||||
| {111} | End of Period Note Balance | {111} | 941,728,137 | |||||||||
| {112} | Overcollateralization | {112} | 122,281,821 | |||||||||
| {113} | Overcollateralization % | {113} | 11.49 | % |
5
RECONCILIATION OF 2026-3 CASH RESERVE ACCOUNT
| {114} | Specified Reserve Balance | {114} | $ | 2,779,132 | ||||||||
| {115} | Beginning of Period Reserve Account balance | {115} | $ | 2,779,132 | ||||||||
| {116} | Investment Earnings | {116} | 8,415 | |||||||||
| {117} | From the Indenture Collection Account, the Reserve Account Required Amount | {117} | 0 | |||||||||
| {118} | To the Indenture Collection Account, the Reserve Account Withdrawal Amount | {118} | 0 | |||||||||
| {119} | Total Reserve balance available: | {119} | 2,787,547 | |||||||||
| {120} | Specified Reserve Balance | {120} | 2,779,132 | |||||||||
| {121} | Release Excess Cash to Indenture Collection Available Funds | {121} | 8,415 | |||||||||
| {122} | End of period Reserve Account balance | {122} | $ | 2,779,132 |
ASSET REPRESENTATIONS REVIEW DELINQUENCY TRIGGER
| Dollars | Percentage | |||||||||||
| {123} | Receivables with Scheduled Payment delinquent 61 days or more | {123} | $ | 780,377 | 0.07 | % | ||||||
| {124} | Compliance (Trigger Violation is a Delinquency Rate Greater Than 1.40%) | {124} | Yes | |||||||||
| By: | /s/ Ellen Billings | ||
| Name: | Ellen Billings | ||
| Title: | Senior Vice President, Controller – North America | ||
| Date: | October 15, 2026 |
6
GM Financial
GMALT 2026-3
Supplemental Monthly Data
September 30, 2026
| Aggregate Securitization Value | Residual Value | |||||||||
| Beginning of Period | $ | 1,080,070,440 | $ | 869,015,293 | ||||||
| Change | (16,060,482 | ) | (5,646,294 | ) | ||||||
| End of Period | $ | 1,064,009,958 | $ | 863,368,999 | ||||||
| Residual Value as % of Agg. Securitization Value | 81.14 | % | ||||||||
Delinquency
| Leases with scheduled payment delinquent | Number of Leases | Agg. Securitization Value | Percentage(1) | |||||||||||
| 0 - 30 days | 31,159 | 1,059,696,042 | 99.59 | % | ||||||||||
| 31 - 60 days | 100 | 3,533,539 | 0.33 | % | ||||||||||
| 61 - 90 days | 20 | 707,630 | 0.07 | % | ||||||||||
| 91 - 120 days | 3 | 72,747 | 0.01 | % | ||||||||||
| Total | 31,282 | 1,064,009,958 | 100.00 | % | ||||||||||
Lease Terminations
| Current Period | Cumulative | |||||||||||||||||
| Number of Leases | Agg. Securitization Value | Number of Leases | Agg. Securitization Value | |||||||||||||||
| Retained vehicles by lessee | ||||||||||||||||||
| Early terminations | 147 | 5,148,648 | 436 | 15,417,525 | ||||||||||||||
| Standard terminations | 0 | 0 | 0 | 0 | ||||||||||||||
| Total retained by lessee | 147 | 5,148,648 | 436 | 15,417,525 | ||||||||||||||
| Returned Vehicles | ||||||||||||||||||
| Early terminations | 19 | 546,911 | 35 | 1,016,152 | ||||||||||||||
| Standard terminations | 0 | 0 | 0 | 0 | ||||||||||||||
| Total returned to dealer | 19 | 546,911 | 35 | 1,016,152 | ||||||||||||||
| Charged off leases / Repossessed vehicles | 44 | 1,366,253 | 126 | 4,101,929 | ||||||||||||||
| Repurchases | 0 | 0 | 0 | 0 | ||||||||||||||
| Other | 0 | 0 | 0 | 0 | ||||||||||||||
| Total terminations | 210 | 7,061,812 | 597 | 20,535,606 | ||||||||||||||
Lease Extensions/Deferments
| Current Period | ||||||||||||||
| Number of Leases | Agg. Securitization Value | Percentage | ||||||||||||
| Term Extensions | 0 | 0 | 0.00 | % | ||||||||||
| Deferments | 13 | 389,026 | 0.04 | % | ||||||||||
7
Net Credit (Gain) Loss
| Current Period | Cumulative | |||||||||||
| Agg. Securitized Value of early term defaults | 1,366,253 | 4,101,929 | ||||||||||
| less: Sales proceeds | 1,207,514 | 3,165,875 | ||||||||||
| less: Excess wear and excess mileage received | 1,983 | 1,983 | ||||||||||
| less: Other amounts received | 0 | 0 | ||||||||||
| Net Credit (Gain) Loss | 156,756 | 934,071 | ||||||||||
Residual (Gain) Loss on Returned Vehicles
| Agg. Securitized Value of returned vehicles sold by Servicer | 479,950 | 984,136 | ||||||||||
| add: Reimbursement of outstanding residual advance | N/A | N/A | ||||||||||
| less: Sales proceeds | 616,721 | 1,141,181 | ||||||||||
| less: Excess wear and excess mileage received | 512 | 512 | ||||||||||
| less: Other recovery amounts | 0 | 0 | ||||||||||
| Residual (Gain) Loss | (137,283 | ) | (157,557 | ) | ||||||||
| Current Period | Prev. Month | |||||||||
| Prepay Speed | 0.5901 | % | 1.2168 | % | ||||||
| Return Rate based on Scheduled to Terminate(2) | 0.0000 | % | 0.0000 | % | ||||||
| Return Rate based on Terminated Leases(3) | 9.0476 | % | 4.1344 | % | ||||||
| (1) Percentages may not add to 100% due to rounding. |
| (2) Percentage of total number of vehicles returned to dealer over number of vehicles scheduled to terminate per month. |
| (3) Percentage of total number of vehicles returned to dealer over number of vehicles terminated per month. |
8