Yes. I will give you my wife's exact numbers so that you can see. Because one unfitting condition was found to be combat related by the PEB after she appealed to the FPEB her entire chapter 61 pension was exempt from taxes. She was an O4 with 17AFS. Her high 3 was $8,038. She maxed out DOD% which is 75% by law. So 75% times $8,038 = $6,029 that is tax free and she will get regardless of any other compensation for the rest of her life. By law any VA compensation she receives must offset her pension. Her VA compensation was $4,200. So $6,029 tax exempt pension minus $4,200 tax free VA compensation = $1,829 she receives from DFAS for her chapter 61 pension. So you can see if her chapter 61 pension wasn't tax exempt she would owe taxes on the $1,829 she receives each month.
Lastly, my wife's earned longevity of 17 AFS years at 2.5% per year equals 42.5% of her high 3. That equals $3,416 earned pension. When you add that together with her $4,200 VA compensation that amount equals $7,616. That amount is higher than the $6,029 she receives. So she is losing out on income still. The $7,616 is the amount she would have received if she had qualified for CRDP and that total is the most she can get by law. That is where CRSC comes in. CRSC is a mechanism to recoup money lost due to not retiring with 20 years. So $7,616 minus $6,029 = $1,587 is how much she is missing out on. She applied for CRSC and was approved for 80%. CRSC uses the same pay tables as the VA. 80% is $2,000 + which means she maxes out on the amount of CRSC she can get and was awarded $1,587 CRSC.
So now she gets $4,200 from the VA. $1,829 from DFAS for chapter 61 pension (Tax Free due to combat related unfitting condition & $1,587 for CRSC. (CRSC is a tax free benefit too)
Hopefully that clears things up. Its always better to get it right at each step. For example. If my wife lost all of her VA and CRSC her floor for compensation would be $6,029 tax free a month. If she lost all of the VA compensation and all of her CRSC and she didn't have a combat related unfitting condition it would be $6,029 a month but taxable meaning her net after taxes would be much lower. The way I see it you want to protect yourself and get the best result in all situations. Had she not appealed to get combat related designation by the PEB in every scenario she is netting less compensation due to paying taxes. With getting VA offset and getting CRSC she still is paying taxes on the $1,827 for her chapter 61 pension. That means she loses out on a couple hundred dollars each month due to taxes.