I made a bit of progress with this, but as with everything, generally it raises more questions than answers.
The response was:-
Any work where the individual is accruing a Class S PRSI stamp is considered self-employment.
Where an individual is self-employed, they are deemed to be in
full time employment, and they are
not eligible for an OSP, as per sections 4 and 5.2 of
Circular 12/2024.
As such,
if the individual takes up self-employment while in receipt of an OSP, the OSP will cease to be payable until such a time as the individual is no longer self-employed.
Pro-rata OSP is
not applicable to self-employment.
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So I can be self employed and when I cease to be self-employed I can avail of the OSP.
Self employment being defined by the payment of an S PRSI stamp.
I am looking at the revenue site to try to make sense of it.
Can I be self employed for a period say of a couple of weeks, play the S stamp for these weeks and have the correspond deduction on the OSP and when the assignment finishes, go back to not being self employed, or is the commitment to self employment more long term.
Also any tips on the logistics of being self employed on the revenue system would be much appreciated as well.