Mr Brown will warn against raising public spending
The UK party is holding its annual conference in Brighton, and although it has been curtailed because of international events, domestic politics are still figuring highly.
Both First Minister Henry McLeish and Scottish Secretary Helen Liddell have urged the party faithful from Scotland to look to the approaching Holyrood election.
Activists were warned that although they have just fought one election they must now begin campaigning for another one.
Gordon Brown, the Chancellor of the Exchequer and Fife MP, will use the first full day of the conference to warn he is ready to tighten his grip on public spending.
In light of the terrorist attacks on America, Mr Brown will also outline plans to clamp down on the sources of terrorist funding.
In his keynote speech to party activists on Monday, Mr Brown will echo the words of the prime minister that current cash increases for health and education are already locked in.
But with fears of recession as a result of the attacks, and the costs of military action incalculable, the Chancellor will insist that his room for manoeuvre may be severely limited.
He will reject the growing demands for more spending, insisting the economy is facing "testing times" which demand discipline.
Mr Brown will also unveil plans to clamp down on the sources of terrorist cash - including more powers for the police.
On Sunday, as the conference began, Helen Liddell turned her attention to international matters and specifically the attacks on the US.
She called on Scots around the globe to become "ambassadors" for their country.
Mrs Liddell said that in a recent US census, 40m people declared that they were Scots.
She said: "I want to reach out to them and Scots throughout the world to invite them to be ambassadors for this new and exciting Scotland. To be part of it."
Mrs Liddell added: "To those 40 million Scots Americans and the rest, I say: The people of Scotland stand with you in this time of tragedy.
"There will always be a place for you in our hearts and a welcome in our homes."