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Depending what POA allows you to do - if you are authorized to file the tax return and or cash checks on his behalf - you perfectly may do that.
If the tax refund check will expire - your son (or you as his POA) may request a replacement check. Generally that will be allowed within three years.
Specifically for the IRS - you might want to use IRS POA form.https://www.irs.gov/pub/irs-pdf/f2848.pdfhere are instructionshttps://www.irs.gov/pub/irs-pdf/i2848.pdf
Generally, when someone submit a Form 2848 to the IRS, it is included on the IRS’s Centralized Authorization File (CAF). The CAF allows IRS personnel who do not have access to the original power of attorney to determine whether the person has authorized an individual to represent him/her.
Regarding your bank - there is no law which requires any specific verbiage - but your bank might have some internal regulations - so you may request your banker what type of POA they are willing to accept.
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