Separation isn't a form you file. It happens on the day one of you decides and acts on it. When you're still living together, that date is harder to show, and almost everything that follows hangs off it.

Encrypted on your own device. Nobody else in the house can open it.
Your vault is encrypted on your own device, with a key only you hold. It locks itself when you close it.
Nobody else in the house can open it. Not the person you are separating from. Not us.
You decide what, if anything, you ever share.
The date you separated is a boundary line in how your assets and debts get divided. When you are both still in the same house, that line can be hard to prove.
Assets and debts built up during the relationship can be treated differently to those that come after it. The separation date decides which is which.
You each have to account for anything sold, transferred or given away in the twelve months before you separated, and everything since. The separation date decides which twelve months that is.
Anything sold, drained or borrowed after you separate happened after the relationship ended, not during it. That only helps you if you can show when it ended.
Money that has already gone cannot simply be put back into the pool. It can still be taken into account when the split is decided, but only if someone can show what happened and when.
When someone moves out, the line marks itself. There is a date on a lease, a removalist, a conversation everyone remembers because something visible happened.
When you both stay, none of that exists. The rooms change quietly. The accounts separate one at a time. Six months later the only record of when it actually happened is what each of you remembers, and you will not remember it the same way.
A note written on the day is worth more than a memory a year later.
And while you are both still here, nothing is standing still. Every week adds more shared facts. Somebody cooks for both of you. A joint bill goes out. Each one is something that can later be pointed at to say it had not really ended.
You are the only person in a position to record it as it happens.
A divorce is a separate step, twelve months after separation, and it decides nothing about money or children. But if you were at the same address for any part of those twelve months, the Court will want more than your word that you were separated. That usually means two written statements, including one from someone outside the relationship.
The paperwork is compulsory. The courtroom usually is not, and most people never attend a hearing.
It is an awkward thing to assemble a year later, from dates nobody wrote down.
Read the Court's own guidance: Separated but living under one roof. And the Legal Aid NSW divorce factsheets.
A dated record, kept as it happens
The day it was said. The day the rooms changed. The day the accounts split. Set down while you still remember it.
Assets, debts and spending, tracked against the line rather than reconstructed after it.
What was actually said between you, with the dates attached. Available when you activate your plan.
For your lawyer, your mediator, or your own affidavit later.
PartWise does not write your affidavit and is not legal advice. It gives you the dated records to write one accurately from.