ESPlanner does account for WEP and GPO, but I don't know the details of this situation you describe. I'd have to ask someone here.

If you included a non-covered pension on the Pensions tab, then ESPlanner is applying both the WEP and the GPO. You can see the effect of the WEP and GPO by temporarily indicating that the pension is covered and comparing the reselts to the non-covered pension results.

rvesp does NOT have a traditional, recurring monthly pension from his/her non-covered employment. He/she has a 401(k) account from his/her non-covered employment from which he/she can take distributions at will, except after 70 1/2, he/she must take annual required minimum distributions.

He/she can enter a lump sum from the 401(k) of the non-covered employment which will trigger the WEP reduction in ESPlanner but then it also distorts the leveling of annual consumption and triggers higher income tax rates for the year of the lump sum distribution.

I have a similar issue in that I have 21 years of covered employment but also opted out of a state employee retirement system for participation in an alternate retirement plan (where the state university and I both contributed to a private retirement plan like a 401(k)). I have no traditional pension, but can take distributions as I please from any of my traditional IRAs, 403(b) accounts, savings, and/or the alternate 401(k) account from my non-covered employment.

Like rvesp, I cannot figure out how to get ESPlanner to calculate the WEP reduction from my projected SS retirement benefit. I have manually determined the maximum WEP reduction to be no more than $371.70 per month based on my age (soon to be 62) and my 21 years of covered employment from the SSA.gov website (see http://www.socialsecurity.gov/planners/retire/wep-chart.html).

How can we reflect this in ESPlanner?

Could a check box for non-covered employment be added to one or more of the fields on the Retirement Accounts-Assets tab in order to trigger WEP reductions for alternate or optional retirement account assets accumulated during non-covered employment?

I've put the implementation of the WEP, per POMS Section RS 00605.364.C.4, for non-covered 401(k) plans that allow an individual who is eligible for retirement or disability benefits to determine the disbursement amount, the duration of the pension, or the start date on our "to-do" list.
https://secure.ssa.gov/poms.nsf/lnx/0300605364

In the interim, can you use a special expense equal to the WEP to reduce your Social Security benefit?

Mike, I thought about doing that but then other numbers may be distorted.

Mike, the other wrinkle which you should consider in the implementation of the WEP reduction in ESPlanner, per POMS Section RS 00605.364.C.4, may be in my case, but not rvesp's scenario because of his/her age, is to calculate whether the WEP reduction can be eliminated entirely IF I completely deplete my non-covered 401k assets, for example by taking 8 equal distributions between age 62 and 69, prior to filing for my SS retirement benefits at age 70.

fmarker,
I think the special expenses for the WEP works fine.
I changed a traditional non-covered pension to covered and added a special expenses that are excludable from AGI equal to 85% (the percent by which SS was taxable) of the WEP and non-tax related expenses for the remaining 15% of the WEP.
The Standard of Living per Adult for the covered pension with special WEP expenses was within 0.07% of the non-covered pension case.

rvesp, If you have 30 years of covered employment, there is no WEP reduction. Otherwise, I think your work-around is just as Mike outlines above:
-maintain your SS benefit as is,
-enter your estimated 401K computed "pension" when you expect to retire as a covered pension,
-enter 85% of your calculated WEP reduction as a special expense that is excluded from AGI, and
-enter 15% of your calculated WEP reduction as a special expense that is not tax related.