Can I join the Army Reserves or National Guard if I am currently collecting compensation from the VA?

yes you can, the guard and reserves will work with you.

I would think the amount of disability and what it is would have some great bearing on the answer.

Your VA disability payments would stop. You could join the Reserve, but not many units want to get a guy who has already been rated by VA for disability.

You can. Even if you don't say anything to the VA you can. They will eventually start pro rating it for you.

Easy answer, it's a big fat NO.

If you are receiving any type of Military pay (other than retirement) you can not at the same time receive V.A. disability pay.

I was recalled from retirement twice, 2001 & 2004, and I asked the same question to the wrong person. I wound up having to repay a few $K. Didn't really hurt me but it was unexpected.

The second time back I got in touch with the V.A. right away to have it stopped.

If you wan't to stay in the game in a Reserve role, by all means do so. You can drill for points and earn a retirement you just can't get paid while doing it.

For those wondering about this and since the original posting is overcome by events, here's the deal.
Assuming you still qualify to be in the military (after all, you are getting disability for something significant enough to get compensation) then the answer is yes. However, you will forfeit an amount of compensation equal to the amount of total days of duty.
So there becomes a calculus. At what point does it become a net money loser? Well, your current rank matters. Assuming that you perform a standard Reserve year of 48 UTAs and 14 days of AT, you will forfeit roughly 17% of your comp pay. If you are an E-4 w/o dependents (that matters too) and 6 years in, then the magic line ends up being between the 90 and 100% level. In other words, unless you are completely broken, you come out ahead by serving as a junior troop.
For an E-7 with 12 years in and two dependents, the magic line is near the 90% level, but he's still slightly ahead in pay.
The more active duty time you serve the less good the deal gets. If you were to deploy, your disability comp gets turned off altogether.
Now where it gets squirrely is that in the USAR, you will have periodic heath assessments. These can screw up your compensation rating, as many get periodically reviewed, especially on a younger veteran and those service medical records are accessible by VA.
Another thing to consider is that your retirement pay will be less than your compensation if you are getting 70% or more (assuming you don't stay in forever and earn a boatload of points). So you are basically doing it for nothing BUT comeradery and service to nation.

I would check first with your local recruiter and then the VA for sure...

I don't know how many times I can say this...fitness standards are captured in AR 40-501. You need to meet the standard per this reg regardless of VA rating.

PFC Corcoran, since in a prior post you mentioned a disqualifying condition for the Reserve Components, another alternative is the State Guard/Militia. This is not to be confused with the National Guard and is not typically a paid position. However it offers the opportunity to wear the uniform, serve in a "quasi-military" unit, and continue to assist your State and local community in an honorable manner. The State Militia serves entirely at the pleasure of the Governor & TAG and cannot be mobilized by the President. These units typically support the National Guard during periods natural disasters and other domestic issues with administrative manpower such as manning the State Emergency Operations Center (EOC), food distribution points, and evacuation shelters. They have military unit designations, wear military uniforms (State flags not American flags), and a formal chain of command.

Yes you can, The VA will deduct the man days from your VA Pay