You can file an amended return for 2022 to reduce the taxable income from September through December. For 2023, you will use the current rating to exclude VA disability from what was pension income. The 90% disability allowed 100% rating as disability pay if I am reading you correctly.
You are in other income section for what reason? What forms did you receive? Do you have a 1099-R or another form or just paperwork? Are you trying to add income or deduct income? You need to deduct taxable income from what was paid but perhaps your forms are correct at this point. What forms do you have and do they show the full amount received as taxable?
Pub 525 ends with page 44 this year so I am not sure what you are seeing. The Armed Forces Guide offers help on pages 8 and 9.
Pub 525 page 19 states;
Retroactive VA determination. If you retire from the U.S. Armed Forces based on years of service and are later given a retroactive service-connected disability rating by the VA, your retirement pay for the retroactive period is excluded from income up to the amount of VA disability benefits you would have been entitled to receive. You can claim a refund of any tax paid on the excludable amount (subject to the statute of limitations) by filing an amended return on Form 1040-X for each previous year during the retroactive period. You must include with each Form 1040-X a copy of the official VA determination letter granting the retroactive benefit. The letter must show the amount withheld and the effective date of the benefit.
Generally, the VA determination letter will contain a table with five headings. The table on the letter must cover the same dates for the tax year reported on the Form 1040-X. To calculate the correct tax reduction, multiply the Effective Months by the Amount Withheld for the tax year.
For example, Form 1040-X filed for tax year 2020. The table shows the Amount Withheld effective December 2019 is $320.00. To calculate the amount for the tax reduction, multiply the 2020 Effective Months by the Amount Withheld. In this case, January–December (2020) is 12
months x $320.00 (Amount Withheld) = $3,840.00; this amount should be the amount claimed as a reduction on Line 1 Adjusted Gross Income (AGI), Column B, of the 2020 Form 1040-X.
If you receive a lump-sum disability severance payment and are later awarded VA disability benefits, exclude 100% of the severance benefit from your income. However, you must include in your income any lump-sum readjustment or other nondisability severance payment you received on release from active duty, even if you're later given a retroactive disability rating by the VA.
If you have questions regarding your situation, see DFAS retirement military and disability help here.
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