Final answer:
Roderick and Ashley Garin can claim a maximum of $500 for the educator expense deduction on their joint return, which is the combined allowable amount for both of them as educators.
Step-by-step explanation:
The maximum amount of the educator expense deduction that Roderick and Ashley Garin can claim on their joint return for 2022 is $500. The IRS allows eligible educators to deduct up to $250 each for unreimbursed business expenses. Since they are both educators and filing jointly, they can combine their deductions for a maximum of $500 ($250 each). Even though their combined expenses exceed $500 (Roderick with $374 and Ashley with $214, totaling $588), the deduction limit is still $500.