Below is a question posted on the usenet newsgroup
misc.taxes.moderated dealing with
SIMPLE plans and responses to the
questions asked.  Ed
Zollars, CPA wrote the answers to this general
set of questions on what a SIMPLE plan provides.  The portions in
italics are the questions asked by the person asking the questions.
Developments are occurring rapidly in this area, since the plans are so
new.  If you believe you might interested in starting up a SIMPLE and wish
to engage us to consult with you on the feasibility and structure of such
a plan please call us at (602) 955-8530 or email us at
htmzcpas@getnet.com.

 I'm looking for some info on SIMPLE plans.  Here are my
specific questions:
 1.  Is $6000 the limit *I* can contribute to a SIMPLE plan
for a given tax year, or does that $6000 include matching
contributions?
That is the maximum you can defer, and does not include the
"employer" matching contribution (I put employer in
quotation marks, since if you are self-employed, you end up
filling both roles).
 2.  I know contributions must be matched by my employer in one
of two ways, either x% for the employees who participate, or y% for
all employees regardless of direct participation.  What are these two
percentages, and are they percentages of gross income, or of the
employee contributions? 
The employer generally must match up to 3% of the employee's
compensation--so if the employee defers 3%, then the
employer puts in 3%.  If the employee defers 4%, the
employer still puts in 3%.  If you are using the SIMPLE-IRA
mechanism (rather than SIMPLE 401(k)), you can optionally
reduce the match to 1% in 2 out of every 5 years.
Another option under either system is to do an across the
board employer contribution of 2% of compensation, noting
that the 401(a)(17) limitations will apply in this case to
limit the maximum considered compensation to $160,000.
3.  Must the employer make matching contributions every
month or pay period during the year, or can s/he hold the
accumulated matching funds until the end of the year and
deposit them to my account in a lump sum?
IRS Notice 97-6 provides:
-- begin quoted text
A. G-6: Matching and nonelective employer contributions
must be made to the financial institution maintaining
the SIMPLE IRA no later than the due date for filing
the employer's income tax return, including extensions,
for the taxable year that includes the last day of the
calendar year for which the contributions are made.
-- end quoted text
4.  If the employer *is* allowed to make a yearly lump sum
matching contribution, is any interest or gain on the
matching portion that has accrued during the year also
credited to the employee's account at that time, or does it
belong to the employer?
The employer not only isn't required to make a contribution
of interest or gain, the employer would be prohibited from
making such a contribution, since that would be in excess of
the amounts allowed.  An employer that is concerned about
such issues should deposit the matching contribution earlier
in the year.
5.  On termination of employment, can a SIMPLE be rolled
over to an IRA like a 401(k) or 403(b)?  If so, does the 60
day period apply?
Are we talking the 401(k) or IRA variety?  Actually, except
for the special period of the first two years, a SIMPLE-IRA
is treated just like a regular IRA.  Similarly, a 401(k)
plan with SIMPLE provisions would work like a regular
qualified plan.
6.  If it can be rolled over, can it be rolled back to
another SIMPLE in the future, and does the common advice
against mixing it with contributory IRA funds still hold
true for that reason?
If it's a SIMPLE-IRA, then it can only be rolled to other
IRA's--you can't put it into a future qualified plan.
If it's a SIMPLE 401(k), then it work like other qualified
plans and you could still use a conduit IRA to hold funds
rolled from the plan that you expected to roll into another
qualified plan in the future.
7.  Can one take a loan against a SIMPLE, as one can do with a
401(k)?  (My guess is no).
No for the SIMPLE IRA, since you can't borrow against an IRA
account.  
8.  Is the SIMPLE a qualified plan, affecting the
"deductibility" of my other IRA contributions much the same
as a 401(k) or 403(b)?  In other words, if I participate in
a SIMPLE I can still contribute the lesser of $2000 or my
earned income to another IRA, correct? (I make too much to
"deduct" it, my wife's in a 401(k) anyway, and yes, I'll do
an 8606!)
Yes to both questions.  You will be a participant and you
can still make an IRA contribution (even though it may not be
deductible).
9.  I'll assume any premature distribution is subject to
income tax and the 10% penalty.
During the first two years of participation in the SIMPLE,
the penalty is *25%*--be careful of that one.
In the event of a premature
distribution where the funds are made available to the
employee (not a direct or custodial rollover, and not an
"FBO" check) is the employer required to withhold 10%, as
with an IRA, or 20%, as with a 401(k)?
Depends again if the IRA or 401(k) vehicle is used.  In
the IRA the answer is no, but for the qualified plan the
answer is yes.
If you want to see even more gory details, I've got IRS Notice 97-6
posted at our site.  That notice describes the IRA variety of SIMPLE
plans and answers a bunch of questions.  You can find it at:
   http://www.getnet.com/~hmtzcpas/snote.htm
The notice also doubles as a great insomnia cure.

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