Aptus Non is the Administratum’s tithe grade for worlds that owe the Imperium no regular tithe. It’s the paperwork side of a simple idea: some planets already give everything they’ve got, and some have nothing worth taking.
What Aptus Non actually means
The Administratum sorts every world it knows about into tithe grades, which decide what that planet has to hand over in men, goods or materials. Aptus Non is the grade that means ‘not applicable’, so no tithe is collected.
You’ll sometimes see it written as Adeptus Non, which is a common slip. The correct term is Aptus Non.
It isn’t a reward or a mark of shame. It’s an administrative ruling that a world either serves the Imperium in a way that can’t be tallied as tithe, or has nothing worth taxing.
Which worlds get it
The exempt worlds fall into two rough groups. The first covers planets that serve the Imperium in a unique way, where their output or purpose already belongs to another branch of the Imperial machine. The second covers worlds that simply wouldn’t be worth taxing.
- Adeptus Mechanicus forge worlds, which answer to the Mechanicus rather than the standard tithe system
- Adeptus Astartes homeworlds, which serve through their Chapter instead
- Knight worlds, tied to their noble houses and their own feudal obligations
- Lifeless dead worlds with no population to tax
- Worlds that can’t produce or provide anything of value
The Space Marine exception
Space Marine homeworlds are Aptus Non, but that doesn’t mean Chapters give nothing back. Every Chapter must hand over 5% of its gene-seed as a tithe.
That gene-seed gets checked for taint or mutation. It also acts as insurance: if a Chapter is wiped out, the stored sample means it might one day be re-founded.
So the grade exempts a homeworld from ordinary tithes, not from the Chapter’s own duty to the Imperium.
Why the grade matters
Tithe grades are how the Imperium keeps track of what it’s owed across a million worlds, and Aptus Non is the line that says ‘nothing here’. It keeps forge worlds, Chapter homeworlds and dead rocks out of the standard collection machinery.
It’s also a reminder that the Administratum’s categories aren’t just about money or goods. Service, purpose and obligation all count.
Key facts
- Aptus Non is an Administratum tithe grade meaning ‘not applicable’
- Worlds with this grade pay no regular tithe
- Forge worlds, Space Marine homeworlds and Knight worlds are typical examples
- Lifeless or worthless worlds can also be graded Aptus Non
- Space Marine Chapters still tithe 5% of their gene-seed
FAQ
Is it Aptus Non or Adeptus Non?
Aptus Non is the correct term. Adeptus Non turns up often, but it’s a mistake.
Do Space Marine homeworlds pay any tithe at all?
Yes. They’re exempt from normal tithes, but every Chapter still gives 5% of its gene-seed to the Imperium.
What does Aptus Non mean in plain terms?
It means ‘not applicable’. The world is on the Administratum’s books but owes no regular tithe.